{"gene":"RMI1","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2005,"finding":"BLAP75/RMI1 is an integral component of BLM complexes, essential for their stability in vivo. Depletion of BLAP75 impairs recruitment of BLM to subnuclear DNA damage foci, results in deficient phosphorylation of BLM during mitosis, and causes elevated sister chromatid exchange, phenocopying BLM depletion.","method":"siRNA knockdown, immunofluorescence colocalization, flow cytometry, SCE assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal functional evidence from siRNA KD with multiple orthogonal phenotypic readouts (foci recruitment, BLM phosphorylation, SCE) in a single focused study","pmids":["15775963"],"is_preprint":false},{"year":2005,"finding":"Yeast Rmi1 physically interacts with both Sgs1 and Top3 and forms a heteromeric complex with them. Rmi1 is a structure-specific DNA binding protein with preference for cruciform structures. Loss of RMI1 phenocopies sgs1 and top3 deletions (hyperrecombination, DNA damage sensitivity, slow growth), and most rmi1 phenotypes are suppressed by sgs1 mutations. The Rmi1-Top3 sub-complex is stable without Sgs1, but loss of either Rmi1 or Top3 compromises the partner's interaction with Sgs1.","method":"Co-immunoprecipitation, recombinant protein interaction assay, genetic epistasis, DNA binding assay with cruciform substrates","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and recombinant pulldown, genetic epistasis with multiple alleles, replicated across labs (Chang et al. same year)","pmids":["15899853"],"is_preprint":false},{"year":2005,"finding":"Yeast Rmi1 (NCE4/YPL024W) physically interacts with Sgs1 and Top3 and is the third member of the Sgs1-Top3 complex. Cells lacking RMI1 activate the Rad53 checkpoint, undergo mitotic delay, display increased Rad52 foci (spontaneous DNA damage), elevated recombination frequency, and increased gross chromosomal rearrangements. rmi1Δ cells also fail to fully activate Rad53 upon DNA damage.","method":"Large-scale genetic interaction clustering, two-hybrid and co-immunoprecipitation, Rad53 checkpoint assays, GCR assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus genetic epistasis plus multiple cellular phenotypes; independently consistent with Mullen et al. 2005","pmids":["15889139"],"is_preprint":false},{"year":2006,"finding":"BLAP75/RMI1 promotes dissolution of double Holliday junctions (dHJs) catalyzed by hTOPO IIIα in a BLM-dependent manner, acting by recruiting hTOPO IIIα to dHJs. This stimulatory effect is specific for hTOPO IIIα and is not observed with E. coli Top1 or Top3.","method":"In vitro dHJ dissolution assay with purified human proteins, DNA binding assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, replicated by Raynard et al. same year with orthogonal methods","pmids":["16537486"],"is_preprint":false},{"year":2006,"finding":"BLAP75/RMI1 associates independently with both Topo IIIα and BLM. Under physiological conditions, dHJ dissolution by BLM-Topo IIIα becomes completely dependent on BLAP75. This effect is specific to the BLM-Topo IIIα pair and is not seen with E. coli RecQ or WRN combined with Topo IIIα. Together BLM, Topo IIIα, and BLAP75 constitute a 'dissolvasome' complex.","method":"In vitro dHJ dissolution assay with highly purified recombinant human proteins, protein-protein interaction assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with purified proteins and multiple specificity controls, consistent with Wu et al. 2006","pmids":["16595695"],"is_preprint":false},{"year":2007,"finding":"Yeast Rmi1 forms a stable complex with Top3 and, together, they stimulate Top3 superhelical relaxation activity; isolated Rmi1 also stimulates Top3 activity in reconstitution. Rmi1 stimulates the ssDNA binding activity of Top3 ~5-fold and cooperates with Top3 to bind the Sgs1 N-terminus and promote its interaction with ssDNA.","method":"Co-immunoprecipitation from yeast overexpression, in vitro DNA relaxation assay, ssDNA binding assay with purified proteins","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with purified proteins and multiple assays, single lab","pmids":["17693398"],"is_preprint":false},{"year":2007,"finding":"The N-terminal third of BLAP75/RMI1 mediates complex formation with both BLM and Topo IIIα, while the DNA binding activity resides in the C-terminal third. The N-terminal third alone is sufficient to promote dHJ dissolution and HJ unwinding by BLM-Topo IIIα. A point mutant K166A defective in Topo IIIα interaction is unable to promote dHJ dissolution, demonstrating that the BLAP75-Topo IIIα interaction is essential for dissolvasome function.","method":"In vitro dHJ dissolution and HJ unwinding assays with BLAP75 protein fragments and point mutants, protein-protein interaction assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with domain mapping and point mutagenesis, single lab","pmids":["18390547"],"is_preprint":false},{"year":2007,"finding":"BLM Holliday junction unwinding activity is greatly enhanced by association with Topo IIIα and BLAP75 together; neither factor alone is sufficient. This enhancement is specific to the BLM-Topo IIIα-BLAP75 combination and is not seen with WRN or RecQ combined with the same partners. The topoisomerase activity of Topo IIIα is dispensable for enhancement of DNA unwinding, but BLM ATPase activity is required for dHJ dissolution.","method":"In vitro Holliday junction unwinding and dHJ dissolution assays with purified proteins, ATPase-dead BLM mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, multiple specificity controls, single lab","pmids":["17728255"],"is_preprint":false},{"year":2007,"finding":"Shu proteins (Csm2, Psy3, Shu1, Shu2) act upstream to promote formation of homologous recombination intermediates (X-molecules) that are subsequently processed by the Sgs1-Rmi1-Top3 complex during S-phase repair of MMS-induced lesions. Mutation of SHU genes attenuates X-molecule levels in sgs1 cells and in cells with impaired Rmi1 or Top3 function.","method":"Genetic epistasis, 2D gel electrophoresis to detect X-molecules in sgs1/shu double mutants","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with 2D gel structural analysis, multiple mutant combinations tested, single lab","pmids":["17671161"],"is_preprint":false},{"year":2007,"finding":"Rmi1 contributes to sister chromatid cohesion via a pathway involving Rad51 and Sgs1-Top3-Rmi1. Loss of RMI1 or TOP3 causes cohesion defects that are suppressed by deletion of SGS1 or RAD51, indicating that aberrant Sgs1-Rad51 activity generates cohesion-blocking structures resolved by Rmi1-Top3.","method":"Genetic epistasis, sister chromatid cohesion assay, benomyl sensitivity assay","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple allele combinations and direct cohesion assay, single lab","pmids":["17571075"],"is_preprint":false},{"year":2010,"finding":"Yeast Sgs1, Top3, and Rmi1 are sufficient to migrate and dissolve a dHJ to produce exclusively non-crossover products. Rmi1 stimulates dHJ dissolution specifically at low Sgs1-Top3 concentrations by stimulating DNA decatenation (removal of final catenane linkages) rather than by affecting the initial rate of Holliday junction migration.","method":"In vitro dHJ dissolution assay with purified S. cerevisiae proteins, ssDNA decatenation assay","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with purified components, mechanistic dissection of Rmi1 role at decatenation step, consistent with human system data","pmids":["20935631"],"is_preprint":false},{"year":2010,"finding":"Top3-Rmi1 complex (with Sgs1) stimulates DNA end resection by the Dna2-Sgs1-RPA complex in vitro by forming a complex with Sgs1 that stimulates DNA unwinding, rather than acting as a nuclease. Top3-Rmi1 and MRX complexes are suggested to recruit the Sgs1-Dna2 machinery to DSBs.","method":"In vitro DNA end resection assay with purified yeast proteins, biochemical reconstitution","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical reconstitution of resection with defined components, mechanistic dissection of each factor's contribution","pmids":["20811461"],"is_preprint":false},{"year":2010,"finding":"Human topoisomerase IIIα is a single-stranded DNA decatenase that is specifically stimulated by the BLM-RMI1 pair. RMI1 interacts with human topoisomerase IIIα, and this interaction is required for RMI1's stimulatory effect on decatenase activity.","method":"In vitro ssDNA decatenation assay with purified human proteins, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assay with purified proteins and interaction mapping, single lab","pmids":["20445207"],"is_preprint":false},{"year":2012,"finding":"Sgs1-Top3-Rmi1-RPA coordinate dsDNA decatenation through sequential passage of single strands. Sgs1 is required both for dsDNA unwinding and has a structural role in DNA strand passage. Rmi1 has a unique regulatory capacity: it slows DNA relaxation by Top3 but specifically stimulates DNA decatenation by stabilizing the 'open' Top3-DNA covalent complex (transient intermediate of strand passage).","method":"In vitro dsDNA decatenation and relaxation assays with purified S. cerevisiae proteins, biochemical dissection of individual subunit contributions","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro, mechanistically dissects Rmi1 stabilization of Top3 open-gate complex, multiple orthogonal assays","pmids":["22885009"],"is_preprint":false},{"year":2012,"finding":"RMI1 is required for normal replication fork progression in human cells. The fork progression defect in RMI1-depleted cells is alleviated by BLM depletion, placing RMI1 downstream of BLM in replication elongation. RMI1 localizes to subnuclear foci with BLM and TopoIIIα under replication stress, requiring an intact BLM-TopoIIIα-RMI1 interaction for proper localization, which is essential for RMI1 to promote recovery from replication stress.","method":"siRNA knockdown, DNA fiber combing (single-molecule replication analysis), immunofluorescence, genetic epistasis with BLM depletion","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — single-molecule DNA fiber analysis plus localization plus genetic epistasis, multiple orthogonal methods, single lab","pmids":["22645306"],"is_preprint":false},{"year":2012,"finding":"RMI1 functions with Ctf18-RFC complex and Mrc1 (but not via the Ctf4/Csm3/Chl1 pathway or Smc3 acetylation pathway) to establish sister chromatid cohesion during S phase. Rmi1 is enriched at regions near early-firing replication origins when forks are stalled by hydroxyurea.","method":"Genetic epistasis analysis, chromatin immunoprecipitation, cohesion assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with defined pathway placement and ChIP, single lab","pmids":["23036200"],"is_preprint":false},{"year":2013,"finding":"RPA physically interacts with RMI1 and enhances BTR-mediated dHJ dissolution. The RPA interaction domain in RMI1 has been mapped, and RMI1 mutants impaired for RPA interaction are defective in dHJ dissolution, establishing that the RMI1-RPA interaction is functionally significant.","method":"In vitro dHJ dissolution assay, co-immunoprecipitation, domain mapping with RMI1 mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with domain mapping and interaction mutants, single lab","pmids":["23543748"],"is_preprint":false},{"year":2013,"finding":"The disordered N-terminus of Sgs1 contains a transient α-helix (residues 25–38) critical for binding Top3 and Rmi1. Proline mutations that disrupt this helix impair Sgs1 binding of Top3 and Rmi1 in vitro, and cause hypersensitivity to DNA damaging agents and increased genome rearrangements in vivo.","method":"NMR spectroscopy, in vitro pulldown binding assays, mutant yeast phenotypic analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure plus in vitro binding plus in vivo phenotype, multiple orthogonal methods, single lab","pmids":["24038467"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of human TopIIIα complexed with the first OB-fold of RMI1 reveals that RMI1 attaches to the edge of the gate in TopIIIα through which DNA passes, and projects a 23-residue loop into the TopIIIα gate, thereby influencing the dynamics of gate opening and closing. This provides the mechanistic basis for how RMI1 stabilizes TopIIIα-gate opening to enable hemicatenane dissolution.","method":"X-ray crystallography, structural analysis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of the complex providing atomic-level mechanistic detail of RMI1-TopIIIα gate interaction","pmids":["24509834"],"is_preprint":false},{"year":2014,"finding":"Topo IIIα-RMI1-RMI2 complex stimulates DNA unwinding by BLM in a manner potentiated by RMI1-RMI2, and the processivity of resection is reliant on Topo IIIα-RMI1-RMI2. Topo IIIα localizes to ends of DSBs implicating it in recruiting resection factors, and contributes to 5'-to-3' polarity of resection alongside RPA.","method":"In vitro DNA end resection assay with purified human proteins, DNA unwinding assay, immunofluorescence","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical reconstitution with purified human proteins, multiple assays, single lab","pmids":["25200081"],"is_preprint":false},{"year":2015,"finding":"Yeast Top3-Rmi1 can dissolve Rad51-mediated D loops through Top3's catalytic (topoisomerase) activity. D loop disruption is specific: yeast Top3 acts on Rad51/Rad54-mediated D loops but not protein-free D loops or D loops mediated by RecA or human RAD51/RAD54. The human TopIIIα-RMI1-RMI2 complex is also capable of D loop dissolution.","method":"In vitro D loop dissolution assay with purified proteins, catalytic mutant analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with catalytic mutant and multiple specificity controls, human complex also tested","pmids":["25699708"],"is_preprint":false},{"year":2015,"finding":"Top3-Rmi1 acts at all meiotic recombination steps previously attributed to Sgs1, including early intermediate chaperoning and crossover/noncrossover designation. In addition, Top3-Rmi1 has Sgs1-independent functions for resolving chromosome entanglements to allow anaphase segregation. Strand-passage activity of Top3-Rmi1 is required for all known Sgs1 functions in meiotic recombination.","method":"Yeast genetics, 2D gel electrophoresis to detect joint molecules, spore viability analysis, physical recombination assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic and physical recombination analysis in multiple mutant backgrounds, independently replicated across three concurrent papers (PMID 25699708, 25699707, 25699709)","pmids":["25699709","25699707"],"is_preprint":false},{"year":2016,"finding":"Sgs1, Top3, and Rmi1 are sumoylated upon generation of recombination structures, driven by Smc5/6-associated SUMO E3 activity. Sgs1 binds poly-SUMO chains and associates with the Smc5/6 SUMO E3 complex. Reduced STR sumoylation leads to accumulation of recombination intermediates; mechanistically, sumoylation promotes STR inter-subunit interactions and accumulation at DNA repair centers.","method":"Co-immunoprecipitation, SUMO modification assays, genetic analysis, ChIP/immunofluorescence of repair center recruitment","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for sumoylation and interaction, cellular localization, and functional rescue experiments, single lab","pmids":["27373152"],"is_preprint":false},{"year":2015,"finding":"RMI1 protein level does not change during G1/S/G2 but significantly increases during M phase, and RMI1 is phosphorylated during mitosis, primarily at Serine 284 and Serine 292, upon microtubule disruption. CDK1 is implicated as an upstream kinase. This mitotic phosphorylation does not interfere with BTR complex formation.","method":"Western blotting through cell cycle, mass spectrometry identification of phosphorylation sites, roscovitine inhibitor treatment, co-immunoprecipitation","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphosite identification by MS plus pharmacological inhibition, single lab, BTR complex integrity confirmed","pmids":["26556339"],"is_preprint":false},{"year":2017,"finding":"In Arabidopsis, C-terminal domains of RMI1 (OB2 domain) and TOP3α (zinc finger motifs) define a sub-complex domain dispensable for resolving recombination intermediates but crucial for limiting extra crossovers during meiosis, indicating these domains have a specific anti-crossover function.","method":"Arabidopsis genetics, analysis of specific domain-deletion and truncation mutants, meiotic crossover counting","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined domain function via specific mutants with quantitative meiotic crossover analysis, single lab, plant ortholog","pmids":["27965412"],"is_preprint":false},{"year":2019,"finding":"Upon DNA damage (camptothecin treatment), RMI1 forms nuclear foci at damaged regions, interacts with RAD51, and facilitates RAD51 recruitment to initiate homologous recombination. RMI1 depletion increases sensitivity to camptothecin, elevates DSBs, and causes stronger DNA damage response and G2/M delay.","method":"siRNA knockdown, immunofluorescence foci analysis, co-immunoprecipitation, comet assay, flow cytometry","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of RMI1-RAD51 and foci analysis with multiple phenotypic readouts, single lab","pmids":["30676768"],"is_preprint":false},{"year":2021,"finding":"Smc5/6 co-localizes with Sgs1-Top3-Rmi1 (STR) at natural pausing sites (NPSs) and facilitates Top3 retention at these sites. Loss of Smc5/6 causes accumulation of joint molecules (reversed forks, dHJs, hemicatenanes) similar to STR depletion, and Smc5/6 functions jointly with Top3 and STR to mediate replication completion at NPSs.","method":"ChIP, 2D gel electrophoresis, genetic suppressor analysis, conditional depletion of STR subunits","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP colocalization with structural analysis of JMs, genetic epistasis, single lab","pmids":["33833229"],"is_preprint":false},{"year":2022,"finding":"The human TopoIIIα-RMI1-RMI2 (TRR) complex forms an open gate in ssDNA of 8.5 ± 3.8 nm. dsDNA binding to the open TRR-ssDNA gate increases the gate size by ~16%, and BLM alters the mechanical flexibility of the gate. Direct visualization confirms TRR can transfer dsDNA through its gate.","method":"Single-molecule optical tweezers and fluorescence microscopy","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-molecule direct visualization of gate dynamics, quantitative measurements, single lab","pmids":["35102151"],"is_preprint":false},{"year":2022,"finding":"The TopoIIIα-RMI1-RMI2 (TRR) complex orients BLM helicase for efficient D-loop disruption. BLM's multi-domain architecture supports a balance between D-loop stabilization and disruption, markedly shifted toward disruption by TRR. This provides a mechanism for context-dependent HR pathway selection.","method":"Single-molecule FRET and fluorescence assays, BLM-TRR complex reconstitution, D-loop disruption assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-molecule reconstitution assay with purified proteins, direct mechanistic measurement, single lab","pmids":["35115525"],"is_preprint":false},{"year":2022,"finding":"TOP3A-RMI1/2 aids BLM in initiating DNA unwinding during long-range resection and, together with MRN, stimulates DNA2-mediated resection. MRN promotes association between BTRR and DNA and synchronizes BLM and DNA2 translocation to prevent BLM pausing during resection.","method":"Single-molecule fluorescence imaging of resection, purified human proteins","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-molecule imaging with purified proteins, direct mechanistic observation, single lab","pmids":["36529288"],"is_preprint":false},{"year":2023,"finding":"In Arabidopsis, KNO1 facilitates K63-linked ubiquitination of RMI1, triggering its autophagic degradation and resulting in increased homologous recombination. KNO1 itself is stabilized by deubiquitinases UBP12/UBP13 upon DNA damage, creating a proteolytic regulatory cascade that fine-tunes HR via RMI1 degradation.","method":"Co-immunoprecipitation, ubiquitination assay, autophagy flux assay, genetic analysis in Arabidopsis","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with functional consequence, plant ortholog, single lab","pmids":["36970874"],"is_preprint":false},{"year":2025,"finding":"Single-molecule magnetic tweezers analysis reveals that the rate-limiting step for human TopIIIα is DNA binding, requiring a small single-stranded region. RMI1 helps TopIIIα trap ssDNA, greatly increasing binding efficiency, and enhances stabilization of the open cleaved complex to favor intermolecular reactions with improved DNA substrate discrimination.","method":"Single-molecule magnetic tweezers","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-molecule direct mechanistic dissection of catalytic steps, identification of RMI1's specific effect on TopIIIα kinetics, single lab","pmids":["40266687"],"is_preprint":false},{"year":2026,"finding":"Human TRR (TopoIIIα-RMI1-RMI2) relaxes highly negatively supercoiled DNA in a processive manner. After completing relaxation, TRR remains stably bound to DNA for extended periods. This activity is consistent with a role in resolving ultrafine anaphase bridges (UFBs) generated by the translocase PICH.","method":"Single-molecule optical tweezers with fluorescence imaging, real-time supercoiling density measurement","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-molecule real-time mechanistic assay with purified TRR complex, single lab","pmids":["41576078"],"is_preprint":false},{"year":2026,"finding":"RNF8 E3 ubiquitin ligase catalyzes K63-linked polyubiquitylation of RMI1 at Lys428, Lys453, and Lys566, which is required for recruitment of RMI1 (and the entire BTR complex) to stalled replication forks. This ubiquitylation is essential for replication fork recovery.","method":"Co-immunoprecipitation, ubiquitination site mapping by mutagenesis, immunofluorescence foci analysis, replication fork recovery assay","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, site-specific mutagenesis, and foci analysis with functional fork recovery readout, single lab","pmids":["41784835"],"is_preprint":false}],"current_model":"RMI1 (BLAP75) is a conserved OB-fold scaffold protein that forms the core BTR/STR dissolvasome complex with BLM/Sgs1 helicase, Topoisomerase IIIα/Top3, and RMI2; it stabilizes the TopIIIα/Top3 open-gate covalent intermediate to enable DNA decatenation, recruits TopIIIα to double Holliday junctions and hemicatenanes, stimulates BLM-dependent DNA unwinding and end resection processivity, facilitates RPA association with the complex, orients BLM for efficient D-loop disruption, and is regulated by mitotic CDK1 phosphorylation (Ser284/Ser292), Smc5/6-dependent sumoylation, and RNF8-dependent K63-linked ubiquitylation at stalled forks—collectively acting at multiple stages of homologous recombination and replication to suppress crossover formation and maintain genome integrity."},"narrative":{"mechanistic_narrative":"RMI1 (BLAP75) is a conserved OB-fold scaffold subunit of the BTR/STR \"dissolvasome\" that, together with the BLM/Sgs1 helicase and Topoisomerase IIIα/Top3 (and RMI2 in humans), processes recombination and replication intermediates to suppress crossovers and maintain genome integrity [PMID:15775963, PMID:15899853, PMID:16595695]. It is an integral, stability-determining component of BLM/Sgs1 complexes: its loss destabilizes the complex, impairs BLM recruitment to damage foci, elevates sister chromatid exchange and recombination, and phenocopies BLM/sgs1/top3 deficiency [PMID:15775963, PMID:15899853, PMID:15889139]. Mechanistically, RMI1 uses a bipartite architecture—an N-terminal third that bridges both BLM/Sgs1 and TopoIIIα/Top3, and a C-terminal DNA-binding region—to render dHJ dissolution into exclusively non-crossover products dependent on the intact complex [PMID:16595695, PMID:18390547, PMID:20935631]. The first OB-fold of RMI1 docks at the edge of the TopoIIIα strand-passage gate and projects a loop into it, stabilizing the open covalent Top3–DNA intermediate to drive single-strand decatenation, hemicatenane and double-Holliday-junction resolution, and processive relaxation of negatively supercoiled DNA [PMID:22885009, PMID:24509834, PMID:40266687, PMID:41576078]. Beyond junction dissolution, RMI1 promotes RAD51-dependent D-loop disruption, orients BLM for context-dependent HR pathway choice, stimulates BLM/Sgs1-dependent long-range end resection processivity, and supports replication fork progression and recovery from stress, with RPA association enhancing dissolution [PMID:20811461, PMID:23543748, PMID:25200081, PMID:25699708, PMID:35115525, PMID:22645306]. RMI1 function is tuned by post-translational regulation, including mitotic CDK1 phosphorylation, Smc5/6-dependent sumoylation, and RNF8-catalyzed K63-linked ubiquitylation that recruits the BTR complex to stalled forks [PMID:26556339, PMID:27373152, PMID:41784835].","teleology":[{"year":2005,"claim":"Established that RMI1/BLAP75 is not an accessory factor but an integral, stability-determining third subunit of the BLM/Sgs1–TopoIIIα/Top3 complex required for its genome-protective function.","evidence":"siRNA depletion with foci/SCE readouts in human cells, plus reciprocal Co-IP, recombinant interaction, and genetic epistasis in yeast","pmids":["15775963","15899853","15889139"],"confidence":"High","gaps":["Did not resolve the biochemical step within HR at which RMI1 acts","Domain basis of the interactions not yet mapped"]},{"year":2006,"claim":"Defined RMI1's catalytic contribution: it makes dHJ dissolution by BLM–TopoIIIα strictly dependent on the complete dissolvasome and recruits TopoIIIα to junctions.","evidence":"In vitro dHJ dissolution with purified human proteins and specificity controls (E. coli Top1/Top3, WRN, RecQ)","pmids":["16537486","16595695"],"confidence":"High","gaps":["Which RMI1 domains mediate partner binding vs. DNA binding was unresolved","Atomic basis of TopoIIIα stimulation unknown"]},{"year":2007,"claim":"Mapped RMI1's modular architecture and demonstrated that the RMI1–TopoIIIα interaction is essential for dissolvasome activity, while stimulation requires the BLM–TopoIIIα–RMI1 triad jointly.","evidence":"Domain fragments, K166A point mutant, and ATPase-dead BLM in in vitro dissolution/unwinding assays; ssDNA-binding reconstitution in yeast","pmids":["18390547","17728255","17693398"],"confidence":"High","gaps":["Structural geometry of RMI1 at the TopoIIIα gate not yet known","Role at meiotic and replication-specific intermediates untested"]},{"year":2007,"claim":"Placed the STR complex within broader genome-maintenance pathways—downstream of Shu-promoted recombination intermediates and contributing to sister chromatid cohesion via Rad51/Sgs1-generated structures.","evidence":"Genetic epistasis with 2D-gel X-molecule detection and cohesion assays in yeast","pmids":["17671161","17571075"],"confidence":"Medium","gaps":["Indirect (genetic) link to cohesion without biochemical reconstitution","Direct RMI1 role at these substrates not isolated"]},{"year":2010,"claim":"Pinpointed RMI1's mechanistic role to the decatenation/strand-passage step and extended STR function to DNA end resection, broadening its activity beyond junction dissolution.","evidence":"In vitro dHJ dissolution/decatenation and Dna2–Sgs1–RPA resection reconstitution with purified yeast proteins; human ssDNA decatenase assays","pmids":["20935631","20811461","20445207"],"confidence":"High","gaps":["How RMI1 selectively stimulates decatenation over relaxation not yet explained mechanistically","In vivo balance of these activities unquantified"]},{"year":2012,"claim":"Resolved the mechanism of RMI1's specificity: it stabilizes the transient 'open' Top3–DNA covalent gate to favor decatenation, and showed RMI1 is needed for normal human replication fork progression downstream of BLM.","evidence":"Biochemical dissection of dsDNA decatenation/relaxation in yeast; DNA fiber combing, localization, and BLM-epistasis in human cells; cohesion ChIP","pmids":["22885009","22645306","23036200"],"confidence":"High","gaps":["Atomic structure of the open-gate stabilization still lacking","Pathway partners for replication role not fully defined"]},{"year":2013,"claim":"Identified RPA as a functionally significant RMI1 partner and mapped the Sgs1 N-terminal helix that anchors Top3–Rmi1, defining the assembly interfaces of the complex.","evidence":"In vitro dissolution with RMI1 interaction mutants and Co-IP; NMR plus binding/phenotypic analysis of the Sgs1 N-terminus","pmids":["23543748","24038467"],"confidence":"High","gaps":["Whether RPA association is regulated in vivo unaddressed","Quantitative contribution of RPA to fork-level function unknown"]},{"year":2014,"claim":"Provided the atomic basis for RMI1 action: its first OB-fold attaches at the edge of the TopoIIIα gate and inserts a loop that controls gate dynamics, while RMI1–RMI2 potentiates resection processivity.","evidence":"X-ray crystallography of human TopoIIIα–RMI1; in vitro human resection/unwinding assays and DSB localization","pmids":["24509834","25200081"],"confidence":"High","gaps":["Dynamics of gate opening during catalysis not captured by static structure","RMI2's discrete contribution incompletely separated"]},{"year":2015,"claim":"Expanded RMI1/Top3 function to active D-loop disruption and to comprehensive meiotic recombination roles, including crossover/noncrossover designation and chromosome disentanglement.","evidence":"In vitro D-loop dissolution with catalytic mutants and human complex; yeast meiotic genetics with 2D-gel JM detection (multiple concurrent studies)","pmids":["25699708","25699709","25699707"],"confidence":"High","gaps":["How D-loop substrate specificity is enforced in cells unclear","Sgs1-independent disentanglement mechanism not biochemically defined"]},{"year":2015,"claim":"Revealed cell-cycle and post-translational control of RMI1, with mitotic CDK1-linked phosphorylation at Ser284/Ser292 that does not disrupt complex integrity.","evidence":"Cell-cycle Western blots, MS phosphosite mapping, roscovitine inhibition, and Co-IP in human cells","pmids":["26556339"],"confidence":"Medium","gaps":["Functional consequence of phosphorylation for activity not established","Direct kinase identity (CDK1) inferred pharmacologically"]},{"year":2017,"claim":"Showed that specific RMI1/TopoIIIα C-terminal domains carry a dedicated anti-crossover function separable from junction resolution.","evidence":"Arabidopsis domain-deletion mutants with quantitative meiotic crossover counting","pmids":["27965412"],"confidence":"Medium","gaps":["Plant-ortholog finding; conservation in human RMI1 untested here","Biochemical activity of the anti-crossover domain undefined"]},{"year":2019,"claim":"Demonstrated a direct RMI1–RAD51 interaction and RMI1's role in promoting RAD51 recruitment to initiate HR after topoisomerase-poison-induced damage.","evidence":"siRNA, foci imaging, Co-IP, comet, and flow cytometry in human cells","pmids":["30676768"],"confidence":"Medium","gaps":["Single-lab Co-IP without structural mapping of the RAD51 interface","Relationship to dissolvasome activity unresolved"]},{"year":2021,"claim":"Connected STR/RMI1 to Smc5/6 at natural replication-pausing sites for joint-molecule resolution and replication completion, and showed Smc5/6-driven STR sumoylation regulates intermediate accumulation.","evidence":"ChIP, 2D-gel JM analysis, conditional depletion and genetics; SUMO modification and interaction assays in yeast","pmids":["33833229","27373152"],"confidence":"Medium","gaps":["Direct in vivo dependency of RMI1 recruitment on sumoylation incompletely separated","Mechanism of Smc5/6-mediated Top3 retention unresolved"]},{"year":2022,"claim":"Single-molecule visualization defined the TRR gate dimensions and dsDNA passage, and showed RMI1/RMI2-containing TRR orients BLM to shift the balance from D-loop stabilization to disruption, enabling HR pathway selection.","evidence":"Optical tweezers/fluorescence gate-dynamics measurements; single-molecule FRET D-loop disruption; single-molecule resection imaging with MRN","pmids":["35102151","35115525","36529288"],"confidence":"High","gaps":["How gate dynamics are coupled to BLM mechanochemistry in cells unclear","In vivo determinants of pathway selection unmapped"]},{"year":2026,"claim":"Refined RMI1's catalytic role to enhancing TopIIIα DNA binding/ssDNA trapping and open-cleaved-complex stabilization, extended TRR activity to processive supercoil relaxation linked to ultrafine bridge resolution, and identified RNF8 K63-ubiquitylation of RMI1 as the signal recruiting BTR to stalled forks.","evidence":"Magnetic/optical tweezers single-molecule kinetics with purified human complexes; Co-IP, site-mapping mutagenesis, foci, and fork-recovery assays","pmids":["40266687","41576078","41784835"],"confidence":"High","gaps":["UFB resolution role inferred from in vitro activity, not shown directly in cells","Interplay of RNF8 ubiquitylation with sumoylation/phosphorylation untested"]},{"year":null,"claim":"How the multiple post-translational modifications of RMI1 (CDK1 phosphorylation, Smc5/6 sumoylation, RNF8/KNO1-linked ubiquitylation) are integrated to switch the dissolvasome between resection, dissolution, and degradation across the cell cycle remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking modifications to specific catalytic outputs","Cross-talk between regulatory pathways untested","Direct disease/Mendelian link for RMI1 not present in this corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13,18,31]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,6,16]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,4]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,14,25]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[0,14]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[3,4,11,19,25]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[14,26,33]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[9,15,21,32]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[21,24]}],"complexes":["BTR/BLM-TopoIIIα-RMI1-RMI2 dissolvasome","STR (Sgs1-Top3-Rmi1)"],"partners":["BLM","TOP3A","RMI2","SGS1","TOP3","RPA","RAD51","RNF8"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H9A7","full_name":"RecQ-mediated genome instability protein 1","aliases":["BLM-associated protein of 75 kDa","BLAP75","FAAP75"],"length_aa":625,"mass_kda":70.1,"function":"Essential component of the RMI complex, a complex that plays an important role in the processing of homologous recombination intermediates to limit DNA crossover formation in cells. 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Infection.","date":"2025","source":"Phytopathology","url":"https://pubmed.ncbi.nlm.nih.gov/40498525","citation_count":1,"is_preprint":false},{"pmid":"39569466","id":"PMC_39569466","title":"RMI1 is essential for maintaining rice genome stability at high temperature.","date":"2024","source":"The Plant journal : for cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/39569466","citation_count":0,"is_preprint":false},{"pmid":"41576078","id":"PMC_41576078","title":"Mechanistic basis for relaxation of DNA supercoils by human topoisomerase IIIα-RMI1-RMI2.","date":"2026","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/41576078","citation_count":0,"is_preprint":false},{"pmid":"41160124","id":"PMC_41160124","title":"Candidate genes at the Rmi1 locus for resistance to Meloidogyne incognita in soybean.","date":"2025","source":"TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik","url":"https://pubmed.ncbi.nlm.nih.gov/41160124","citation_count":0,"is_preprint":false},{"pmid":"41784835","id":"PMC_41784835","title":"K63-linked ubiquitylation of RMI1 by RNF8 is essential to its recruitment to stalled forks.","date":"2026","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/41784835","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.10.17.25338220","title":"Identifying the best diagnostic test for Ovarian cancer in premenopausal women with non-specific symptoms – results from the ROCkeTS prospective, multicentre, cohort study","date":"2025-10-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.17.25338220","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.17.649287","title":"BTRR complex deficiency is a driver for genomic instability in Bloom syndrome","date":"2025-04-22","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.17.649287","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":30633,"output_tokens":8353,"usd":0.108597,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18073,"output_tokens":5209,"usd":0.110295,"stage2_stop_reason":"end_turn"},"total_usd":0.218892,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"BLAP75/RMI1 is an integral component of BLM complexes, essential for their stability in vivo. Depletion of BLAP75 impairs recruitment of BLM to subnuclear DNA damage foci, results in deficient phosphorylation of BLM during mitosis, and causes elevated sister chromatid exchange, phenocopying BLM depletion.\",\n      \"method\": \"siRNA knockdown, immunofluorescence colocalization, flow cytometry, SCE assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal functional evidence from siRNA KD with multiple orthogonal phenotypic readouts (foci recruitment, BLM phosphorylation, SCE) in a single focused study\",\n      \"pmids\": [\"15775963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Yeast Rmi1 physically interacts with both Sgs1 and Top3 and forms a heteromeric complex with them. Rmi1 is a structure-specific DNA binding protein with preference for cruciform structures. Loss of RMI1 phenocopies sgs1 and top3 deletions (hyperrecombination, DNA damage sensitivity, slow growth), and most rmi1 phenotypes are suppressed by sgs1 mutations. The Rmi1-Top3 sub-complex is stable without Sgs1, but loss of either Rmi1 or Top3 compromises the partner's interaction with Sgs1.\",\n      \"method\": \"Co-immunoprecipitation, recombinant protein interaction assay, genetic epistasis, DNA binding assay with cruciform substrates\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and recombinant pulldown, genetic epistasis with multiple alleles, replicated across labs (Chang et al. same year)\",\n      \"pmids\": [\"15899853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Yeast Rmi1 (NCE4/YPL024W) physically interacts with Sgs1 and Top3 and is the third member of the Sgs1-Top3 complex. Cells lacking RMI1 activate the Rad53 checkpoint, undergo mitotic delay, display increased Rad52 foci (spontaneous DNA damage), elevated recombination frequency, and increased gross chromosomal rearrangements. rmi1Δ cells also fail to fully activate Rad53 upon DNA damage.\",\n      \"method\": \"Large-scale genetic interaction clustering, two-hybrid and co-immunoprecipitation, Rad53 checkpoint assays, GCR assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus genetic epistasis plus multiple cellular phenotypes; independently consistent with Mullen et al. 2005\",\n      \"pmids\": [\"15889139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"BLAP75/RMI1 promotes dissolution of double Holliday junctions (dHJs) catalyzed by hTOPO IIIα in a BLM-dependent manner, acting by recruiting hTOPO IIIα to dHJs. This stimulatory effect is specific for hTOPO IIIα and is not observed with E. coli Top1 or Top3.\",\n      \"method\": \"In vitro dHJ dissolution assay with purified human proteins, DNA binding assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, replicated by Raynard et al. same year with orthogonal methods\",\n      \"pmids\": [\"16537486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"BLAP75/RMI1 associates independently with both Topo IIIα and BLM. Under physiological conditions, dHJ dissolution by BLM-Topo IIIα becomes completely dependent on BLAP75. This effect is specific to the BLM-Topo IIIα pair and is not seen with E. coli RecQ or WRN combined with Topo IIIα. Together BLM, Topo IIIα, and BLAP75 constitute a 'dissolvasome' complex.\",\n      \"method\": \"In vitro dHJ dissolution assay with highly purified recombinant human proteins, protein-protein interaction assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with purified proteins and multiple specificity controls, consistent with Wu et al. 2006\",\n      \"pmids\": [\"16595695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Yeast Rmi1 forms a stable complex with Top3 and, together, they stimulate Top3 superhelical relaxation activity; isolated Rmi1 also stimulates Top3 activity in reconstitution. Rmi1 stimulates the ssDNA binding activity of Top3 ~5-fold and cooperates with Top3 to bind the Sgs1 N-terminus and promote its interaction with ssDNA.\",\n      \"method\": \"Co-immunoprecipitation from yeast overexpression, in vitro DNA relaxation assay, ssDNA binding assay with purified proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with purified proteins and multiple assays, single lab\",\n      \"pmids\": [\"17693398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The N-terminal third of BLAP75/RMI1 mediates complex formation with both BLM and Topo IIIα, while the DNA binding activity resides in the C-terminal third. The N-terminal third alone is sufficient to promote dHJ dissolution and HJ unwinding by BLM-Topo IIIα. A point mutant K166A defective in Topo IIIα interaction is unable to promote dHJ dissolution, demonstrating that the BLAP75-Topo IIIα interaction is essential for dissolvasome function.\",\n      \"method\": \"In vitro dHJ dissolution and HJ unwinding assays with BLAP75 protein fragments and point mutants, protein-protein interaction assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with domain mapping and point mutagenesis, single lab\",\n      \"pmids\": [\"18390547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"BLM Holliday junction unwinding activity is greatly enhanced by association with Topo IIIα and BLAP75 together; neither factor alone is sufficient. This enhancement is specific to the BLM-Topo IIIα-BLAP75 combination and is not seen with WRN or RecQ combined with the same partners. The topoisomerase activity of Topo IIIα is dispensable for enhancement of DNA unwinding, but BLM ATPase activity is required for dHJ dissolution.\",\n      \"method\": \"In vitro Holliday junction unwinding and dHJ dissolution assays with purified proteins, ATPase-dead BLM mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, multiple specificity controls, single lab\",\n      \"pmids\": [\"17728255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Shu proteins (Csm2, Psy3, Shu1, Shu2) act upstream to promote formation of homologous recombination intermediates (X-molecules) that are subsequently processed by the Sgs1-Rmi1-Top3 complex during S-phase repair of MMS-induced lesions. Mutation of SHU genes attenuates X-molecule levels in sgs1 cells and in cells with impaired Rmi1 or Top3 function.\",\n      \"method\": \"Genetic epistasis, 2D gel electrophoresis to detect X-molecules in sgs1/shu double mutants\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with 2D gel structural analysis, multiple mutant combinations tested, single lab\",\n      \"pmids\": [\"17671161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rmi1 contributes to sister chromatid cohesion via a pathway involving Rad51 and Sgs1-Top3-Rmi1. Loss of RMI1 or TOP3 causes cohesion defects that are suppressed by deletion of SGS1 or RAD51, indicating that aberrant Sgs1-Rad51 activity generates cohesion-blocking structures resolved by Rmi1-Top3.\",\n      \"method\": \"Genetic epistasis, sister chromatid cohesion assay, benomyl sensitivity assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple allele combinations and direct cohesion assay, single lab\",\n      \"pmids\": [\"17571075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Yeast Sgs1, Top3, and Rmi1 are sufficient to migrate and dissolve a dHJ to produce exclusively non-crossover products. Rmi1 stimulates dHJ dissolution specifically at low Sgs1-Top3 concentrations by stimulating DNA decatenation (removal of final catenane linkages) rather than by affecting the initial rate of Holliday junction migration.\",\n      \"method\": \"In vitro dHJ dissolution assay with purified S. cerevisiae proteins, ssDNA decatenation assay\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with purified components, mechanistic dissection of Rmi1 role at decatenation step, consistent with human system data\",\n      \"pmids\": [\"20935631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Top3-Rmi1 complex (with Sgs1) stimulates DNA end resection by the Dna2-Sgs1-RPA complex in vitro by forming a complex with Sgs1 that stimulates DNA unwinding, rather than acting as a nuclease. Top3-Rmi1 and MRX complexes are suggested to recruit the Sgs1-Dna2 machinery to DSBs.\",\n      \"method\": \"In vitro DNA end resection assay with purified yeast proteins, biochemical reconstitution\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical reconstitution of resection with defined components, mechanistic dissection of each factor's contribution\",\n      \"pmids\": [\"20811461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human topoisomerase IIIα is a single-stranded DNA decatenase that is specifically stimulated by the BLM-RMI1 pair. RMI1 interacts with human topoisomerase IIIα, and this interaction is required for RMI1's stimulatory effect on decatenase activity.\",\n      \"method\": \"In vitro ssDNA decatenation assay with purified human proteins, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assay with purified proteins and interaction mapping, single lab\",\n      \"pmids\": [\"20445207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sgs1-Top3-Rmi1-RPA coordinate dsDNA decatenation through sequential passage of single strands. Sgs1 is required both for dsDNA unwinding and has a structural role in DNA strand passage. Rmi1 has a unique regulatory capacity: it slows DNA relaxation by Top3 but specifically stimulates DNA decatenation by stabilizing the 'open' Top3-DNA covalent complex (transient intermediate of strand passage).\",\n      \"method\": \"In vitro dsDNA decatenation and relaxation assays with purified S. cerevisiae proteins, biochemical dissection of individual subunit contributions\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro, mechanistically dissects Rmi1 stabilization of Top3 open-gate complex, multiple orthogonal assays\",\n      \"pmids\": [\"22885009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RMI1 is required for normal replication fork progression in human cells. The fork progression defect in RMI1-depleted cells is alleviated by BLM depletion, placing RMI1 downstream of BLM in replication elongation. RMI1 localizes to subnuclear foci with BLM and TopoIIIα under replication stress, requiring an intact BLM-TopoIIIα-RMI1 interaction for proper localization, which is essential for RMI1 to promote recovery from replication stress.\",\n      \"method\": \"siRNA knockdown, DNA fiber combing (single-molecule replication analysis), immunofluorescence, genetic epistasis with BLM depletion\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-molecule DNA fiber analysis plus localization plus genetic epistasis, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"22645306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RMI1 functions with Ctf18-RFC complex and Mrc1 (but not via the Ctf4/Csm3/Chl1 pathway or Smc3 acetylation pathway) to establish sister chromatid cohesion during S phase. Rmi1 is enriched at regions near early-firing replication origins when forks are stalled by hydroxyurea.\",\n      \"method\": \"Genetic epistasis analysis, chromatin immunoprecipitation, cohesion assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with defined pathway placement and ChIP, single lab\",\n      \"pmids\": [\"23036200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RPA physically interacts with RMI1 and enhances BTR-mediated dHJ dissolution. The RPA interaction domain in RMI1 has been mapped, and RMI1 mutants impaired for RPA interaction are defective in dHJ dissolution, establishing that the RMI1-RPA interaction is functionally significant.\",\n      \"method\": \"In vitro dHJ dissolution assay, co-immunoprecipitation, domain mapping with RMI1 mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with domain mapping and interaction mutants, single lab\",\n      \"pmids\": [\"23543748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The disordered N-terminus of Sgs1 contains a transient α-helix (residues 25–38) critical for binding Top3 and Rmi1. Proline mutations that disrupt this helix impair Sgs1 binding of Top3 and Rmi1 in vitro, and cause hypersensitivity to DNA damaging agents and increased genome rearrangements in vivo.\",\n      \"method\": \"NMR spectroscopy, in vitro pulldown binding assays, mutant yeast phenotypic analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure plus in vitro binding plus in vivo phenotype, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"24038467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of human TopIIIα complexed with the first OB-fold of RMI1 reveals that RMI1 attaches to the edge of the gate in TopIIIα through which DNA passes, and projects a 23-residue loop into the TopIIIα gate, thereby influencing the dynamics of gate opening and closing. This provides the mechanistic basis for how RMI1 stabilizes TopIIIα-gate opening to enable hemicatenane dissolution.\",\n      \"method\": \"X-ray crystallography, structural analysis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of the complex providing atomic-level mechanistic detail of RMI1-TopIIIα gate interaction\",\n      \"pmids\": [\"24509834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Topo IIIα-RMI1-RMI2 complex stimulates DNA unwinding by BLM in a manner potentiated by RMI1-RMI2, and the processivity of resection is reliant on Topo IIIα-RMI1-RMI2. Topo IIIα localizes to ends of DSBs implicating it in recruiting resection factors, and contributes to 5'-to-3' polarity of resection alongside RPA.\",\n      \"method\": \"In vitro DNA end resection assay with purified human proteins, DNA unwinding assay, immunofluorescence\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical reconstitution with purified human proteins, multiple assays, single lab\",\n      \"pmids\": [\"25200081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Yeast Top3-Rmi1 can dissolve Rad51-mediated D loops through Top3's catalytic (topoisomerase) activity. D loop disruption is specific: yeast Top3 acts on Rad51/Rad54-mediated D loops but not protein-free D loops or D loops mediated by RecA or human RAD51/RAD54. The human TopIIIα-RMI1-RMI2 complex is also capable of D loop dissolution.\",\n      \"method\": \"In vitro D loop dissolution assay with purified proteins, catalytic mutant analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with catalytic mutant and multiple specificity controls, human complex also tested\",\n      \"pmids\": [\"25699708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Top3-Rmi1 acts at all meiotic recombination steps previously attributed to Sgs1, including early intermediate chaperoning and crossover/noncrossover designation. In addition, Top3-Rmi1 has Sgs1-independent functions for resolving chromosome entanglements to allow anaphase segregation. Strand-passage activity of Top3-Rmi1 is required for all known Sgs1 functions in meiotic recombination.\",\n      \"method\": \"Yeast genetics, 2D gel electrophoresis to detect joint molecules, spore viability analysis, physical recombination assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic and physical recombination analysis in multiple mutant backgrounds, independently replicated across three concurrent papers (PMID 25699708, 25699707, 25699709)\",\n      \"pmids\": [\"25699709\", \"25699707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Sgs1, Top3, and Rmi1 are sumoylated upon generation of recombination structures, driven by Smc5/6-associated SUMO E3 activity. Sgs1 binds poly-SUMO chains and associates with the Smc5/6 SUMO E3 complex. Reduced STR sumoylation leads to accumulation of recombination intermediates; mechanistically, sumoylation promotes STR inter-subunit interactions and accumulation at DNA repair centers.\",\n      \"method\": \"Co-immunoprecipitation, SUMO modification assays, genetic analysis, ChIP/immunofluorescence of repair center recruitment\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for sumoylation and interaction, cellular localization, and functional rescue experiments, single lab\",\n      \"pmids\": [\"27373152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RMI1 protein level does not change during G1/S/G2 but significantly increases during M phase, and RMI1 is phosphorylated during mitosis, primarily at Serine 284 and Serine 292, upon microtubule disruption. CDK1 is implicated as an upstream kinase. This mitotic phosphorylation does not interfere with BTR complex formation.\",\n      \"method\": \"Western blotting through cell cycle, mass spectrometry identification of phosphorylation sites, roscovitine inhibitor treatment, co-immunoprecipitation\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphosite identification by MS plus pharmacological inhibition, single lab, BTR complex integrity confirmed\",\n      \"pmids\": [\"26556339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Arabidopsis, C-terminal domains of RMI1 (OB2 domain) and TOP3α (zinc finger motifs) define a sub-complex domain dispensable for resolving recombination intermediates but crucial for limiting extra crossovers during meiosis, indicating these domains have a specific anti-crossover function.\",\n      \"method\": \"Arabidopsis genetics, analysis of specific domain-deletion and truncation mutants, meiotic crossover counting\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined domain function via specific mutants with quantitative meiotic crossover analysis, single lab, plant ortholog\",\n      \"pmids\": [\"27965412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Upon DNA damage (camptothecin treatment), RMI1 forms nuclear foci at damaged regions, interacts with RAD51, and facilitates RAD51 recruitment to initiate homologous recombination. RMI1 depletion increases sensitivity to camptothecin, elevates DSBs, and causes stronger DNA damage response and G2/M delay.\",\n      \"method\": \"siRNA knockdown, immunofluorescence foci analysis, co-immunoprecipitation, comet assay, flow cytometry\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of RMI1-RAD51 and foci analysis with multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"30676768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Smc5/6 co-localizes with Sgs1-Top3-Rmi1 (STR) at natural pausing sites (NPSs) and facilitates Top3 retention at these sites. Loss of Smc5/6 causes accumulation of joint molecules (reversed forks, dHJs, hemicatenanes) similar to STR depletion, and Smc5/6 functions jointly with Top3 and STR to mediate replication completion at NPSs.\",\n      \"method\": \"ChIP, 2D gel electrophoresis, genetic suppressor analysis, conditional depletion of STR subunits\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP colocalization with structural analysis of JMs, genetic epistasis, single lab\",\n      \"pmids\": [\"33833229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The human TopoIIIα-RMI1-RMI2 (TRR) complex forms an open gate in ssDNA of 8.5 ± 3.8 nm. dsDNA binding to the open TRR-ssDNA gate increases the gate size by ~16%, and BLM alters the mechanical flexibility of the gate. Direct visualization confirms TRR can transfer dsDNA through its gate.\",\n      \"method\": \"Single-molecule optical tweezers and fluorescence microscopy\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule direct visualization of gate dynamics, quantitative measurements, single lab\",\n      \"pmids\": [\"35102151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The TopoIIIα-RMI1-RMI2 (TRR) complex orients BLM helicase for efficient D-loop disruption. BLM's multi-domain architecture supports a balance between D-loop stabilization and disruption, markedly shifted toward disruption by TRR. This provides a mechanism for context-dependent HR pathway selection.\",\n      \"method\": \"Single-molecule FRET and fluorescence assays, BLM-TRR complex reconstitution, D-loop disruption assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule reconstitution assay with purified proteins, direct mechanistic measurement, single lab\",\n      \"pmids\": [\"35115525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TOP3A-RMI1/2 aids BLM in initiating DNA unwinding during long-range resection and, together with MRN, stimulates DNA2-mediated resection. MRN promotes association between BTRR and DNA and synchronizes BLM and DNA2 translocation to prevent BLM pausing during resection.\",\n      \"method\": \"Single-molecule fluorescence imaging of resection, purified human proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule imaging with purified proteins, direct mechanistic observation, single lab\",\n      \"pmids\": [\"36529288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In Arabidopsis, KNO1 facilitates K63-linked ubiquitination of RMI1, triggering its autophagic degradation and resulting in increased homologous recombination. KNO1 itself is stabilized by deubiquitinases UBP12/UBP13 upon DNA damage, creating a proteolytic regulatory cascade that fine-tunes HR via RMI1 degradation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, autophagy flux assay, genetic analysis in Arabidopsis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with functional consequence, plant ortholog, single lab\",\n      \"pmids\": [\"36970874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Single-molecule magnetic tweezers analysis reveals that the rate-limiting step for human TopIIIα is DNA binding, requiring a small single-stranded region. RMI1 helps TopIIIα trap ssDNA, greatly increasing binding efficiency, and enhances stabilization of the open cleaved complex to favor intermolecular reactions with improved DNA substrate discrimination.\",\n      \"method\": \"Single-molecule magnetic tweezers\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule direct mechanistic dissection of catalytic steps, identification of RMI1's specific effect on TopIIIα kinetics, single lab\",\n      \"pmids\": [\"40266687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Human TRR (TopoIIIα-RMI1-RMI2) relaxes highly negatively supercoiled DNA in a processive manner. After completing relaxation, TRR remains stably bound to DNA for extended periods. This activity is consistent with a role in resolving ultrafine anaphase bridges (UFBs) generated by the translocase PICH.\",\n      \"method\": \"Single-molecule optical tweezers with fluorescence imaging, real-time supercoiling density measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule real-time mechanistic assay with purified TRR complex, single lab\",\n      \"pmids\": [\"41576078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"RNF8 E3 ubiquitin ligase catalyzes K63-linked polyubiquitylation of RMI1 at Lys428, Lys453, and Lys566, which is required for recruitment of RMI1 (and the entire BTR complex) to stalled replication forks. This ubiquitylation is essential for replication fork recovery.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination site mapping by mutagenesis, immunofluorescence foci analysis, replication fork recovery assay\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, site-specific mutagenesis, and foci analysis with functional fork recovery readout, single lab\",\n      \"pmids\": [\"41784835\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RMI1 (BLAP75) is a conserved OB-fold scaffold protein that forms the core BTR/STR dissolvasome complex with BLM/Sgs1 helicase, Topoisomerase IIIα/Top3, and RMI2; it stabilizes the TopIIIα/Top3 open-gate covalent intermediate to enable DNA decatenation, recruits TopIIIα to double Holliday junctions and hemicatenanes, stimulates BLM-dependent DNA unwinding and end resection processivity, facilitates RPA association with the complex, orients BLM for efficient D-loop disruption, and is regulated by mitotic CDK1 phosphorylation (Ser284/Ser292), Smc5/6-dependent sumoylation, and RNF8-dependent K63-linked ubiquitylation at stalled forks—collectively acting at multiple stages of homologous recombination and replication to suppress crossover formation and maintain genome integrity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RMI1 (BLAP75) is a conserved OB-fold scaffold subunit of the BTR/STR \\\"dissolvasome\\\" that, together with the BLM/Sgs1 helicase and Topoisomerase IIIα/Top3 (and RMI2 in humans), processes recombination and replication intermediates to suppress crossovers and maintain genome integrity [#0, #1, #4]. It is an integral, stability-determining component of BLM/Sgs1 complexes: its loss destabilizes the complex, impairs BLM recruitment to damage foci, elevates sister chromatid exchange and recombination, and phenocopies BLM/sgs1/top3 deficiency [#0, #1, #2]. Mechanistically, RMI1 uses a bipartite architecture—an N-terminal third that bridges both BLM/Sgs1 and TopoIIIα/Top3, and a C-terminal DNA-binding region—to render dHJ dissolution into exclusively non-crossover products dependent on the intact complex [#4, #6, #10]. The first OB-fold of RMI1 docks at the edge of the TopoIIIα strand-passage gate and projects a loop into it, stabilizing the open covalent Top3–DNA intermediate to drive single-strand decatenation, hemicatenane and double-Holliday-junction resolution, and processive relaxation of negatively supercoiled DNA [#13, #18, #31, #32]. Beyond junction dissolution, RMI1 promotes RAD51-dependent D-loop disruption, orients BLM for context-dependent HR pathway choice, stimulates BLM/Sgs1-dependent long-range end resection processivity, and supports replication fork progression and recovery from stress, with RPA association enhancing dissolution [#11, #16, #19, #20, #28, #14]. RMI1 function is tuned by post-translational regulation, including mitotic CDK1 phosphorylation, Smc5/6-dependent sumoylation, and RNF8-catalyzed K63-linked ubiquitylation that recruits the BTR complex to stalled forks [#23, #22, #33].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established that RMI1/BLAP75 is not an accessory factor but an integral, stability-determining third subunit of the BLM/Sgs1–TopoIIIα/Top3 complex required for its genome-protective function.\",\n      \"evidence\": \"siRNA depletion with foci/SCE readouts in human cells, plus reciprocal Co-IP, recombinant interaction, and genetic epistasis in yeast\",\n      \"pmids\": [\"15775963\", \"15899853\", \"15889139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the biochemical step within HR at which RMI1 acts\", \"Domain basis of the interactions not yet mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined RMI1's catalytic contribution: it makes dHJ dissolution by BLM–TopoIIIα strictly dependent on the complete dissolvasome and recruits TopoIIIα to junctions.\",\n      \"evidence\": \"In vitro dHJ dissolution with purified human proteins and specificity controls (E. coli Top1/Top3, WRN, RecQ)\",\n      \"pmids\": [\"16537486\", \"16595695\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which RMI1 domains mediate partner binding vs. DNA binding was unresolved\", \"Atomic basis of TopoIIIα stimulation unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapped RMI1's modular architecture and demonstrated that the RMI1–TopoIIIα interaction is essential for dissolvasome activity, while stimulation requires the BLM–TopoIIIα–RMI1 triad jointly.\",\n      \"evidence\": \"Domain fragments, K166A point mutant, and ATPase-dead BLM in in vitro dissolution/unwinding assays; ssDNA-binding reconstitution in yeast\",\n      \"pmids\": [\"18390547\", \"17728255\", \"17693398\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural geometry of RMI1 at the TopoIIIα gate not yet known\", \"Role at meiotic and replication-specific intermediates untested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placed the STR complex within broader genome-maintenance pathways—downstream of Shu-promoted recombination intermediates and contributing to sister chromatid cohesion via Rad51/Sgs1-generated structures.\",\n      \"evidence\": \"Genetic epistasis with 2D-gel X-molecule detection and cohesion assays in yeast\",\n      \"pmids\": [\"17671161\", \"17571075\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Indirect (genetic) link to cohesion without biochemical reconstitution\", \"Direct RMI1 role at these substrates not isolated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Pinpointed RMI1's mechanistic role to the decatenation/strand-passage step and extended STR function to DNA end resection, broadening its activity beyond junction dissolution.\",\n      \"evidence\": \"In vitro dHJ dissolution/decatenation and Dna2–Sgs1–RPA resection reconstitution with purified yeast proteins; human ssDNA decatenase assays\",\n      \"pmids\": [\"20935631\", \"20811461\", \"20445207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RMI1 selectively stimulates decatenation over relaxation not yet explained mechanistically\", \"In vivo balance of these activities unquantified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the mechanism of RMI1's specificity: it stabilizes the transient 'open' Top3–DNA covalent gate to favor decatenation, and showed RMI1 is needed for normal human replication fork progression downstream of BLM.\",\n      \"evidence\": \"Biochemical dissection of dsDNA decatenation/relaxation in yeast; DNA fiber combing, localization, and BLM-epistasis in human cells; cohesion ChIP\",\n      \"pmids\": [\"22885009\", \"22645306\", \"23036200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the open-gate stabilization still lacking\", \"Pathway partners for replication role not fully defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified RPA as a functionally significant RMI1 partner and mapped the Sgs1 N-terminal helix that anchors Top3–Rmi1, defining the assembly interfaces of the complex.\",\n      \"evidence\": \"In vitro dissolution with RMI1 interaction mutants and Co-IP; NMR plus binding/phenotypic analysis of the Sgs1 N-terminus\",\n      \"pmids\": [\"23543748\", \"24038467\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RPA association is regulated in vivo unaddressed\", \"Quantitative contribution of RPA to fork-level function unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Provided the atomic basis for RMI1 action: its first OB-fold attaches at the edge of the TopoIIIα gate and inserts a loop that controls gate dynamics, while RMI1–RMI2 potentiates resection processivity.\",\n      \"evidence\": \"X-ray crystallography of human TopoIIIα–RMI1; in vitro human resection/unwinding assays and DSB localization\",\n      \"pmids\": [\"24509834\", \"25200081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of gate opening during catalysis not captured by static structure\", \"RMI2's discrete contribution incompletely separated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Expanded RMI1/Top3 function to active D-loop disruption and to comprehensive meiotic recombination roles, including crossover/noncrossover designation and chromosome disentanglement.\",\n      \"evidence\": \"In vitro D-loop dissolution with catalytic mutants and human complex; yeast meiotic genetics with 2D-gel JM detection (multiple concurrent studies)\",\n      \"pmids\": [\"25699708\", \"25699709\", \"25699707\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How D-loop substrate specificity is enforced in cells unclear\", \"Sgs1-independent disentanglement mechanism not biochemically defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed cell-cycle and post-translational control of RMI1, with mitotic CDK1-linked phosphorylation at Ser284/Ser292 that does not disrupt complex integrity.\",\n      \"evidence\": \"Cell-cycle Western blots, MS phosphosite mapping, roscovitine inhibition, and Co-IP in human cells\",\n      \"pmids\": [\"26556339\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of phosphorylation for activity not established\", \"Direct kinase identity (CDK1) inferred pharmacologically\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed that specific RMI1/TopoIIIα C-terminal domains carry a dedicated anti-crossover function separable from junction resolution.\",\n      \"evidence\": \"Arabidopsis domain-deletion mutants with quantitative meiotic crossover counting\",\n      \"pmids\": [\"27965412\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Plant-ortholog finding; conservation in human RMI1 untested here\", \"Biochemical activity of the anti-crossover domain undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated a direct RMI1–RAD51 interaction and RMI1's role in promoting RAD51 recruitment to initiate HR after topoisomerase-poison-induced damage.\",\n      \"evidence\": \"siRNA, foci imaging, Co-IP, comet, and flow cytometry in human cells\",\n      \"pmids\": [\"30676768\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP without structural mapping of the RAD51 interface\", \"Relationship to dissolvasome activity unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected STR/RMI1 to Smc5/6 at natural replication-pausing sites for joint-molecule resolution and replication completion, and showed Smc5/6-driven STR sumoylation regulates intermediate accumulation.\",\n      \"evidence\": \"ChIP, 2D-gel JM analysis, conditional depletion and genetics; SUMO modification and interaction assays in yeast\",\n      \"pmids\": [\"33833229\", \"27373152\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct in vivo dependency of RMI1 recruitment on sumoylation incompletely separated\", \"Mechanism of Smc5/6-mediated Top3 retention unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Single-molecule visualization defined the TRR gate dimensions and dsDNA passage, and showed RMI1/RMI2-containing TRR orients BLM to shift the balance from D-loop stabilization to disruption, enabling HR pathway selection.\",\n      \"evidence\": \"Optical tweezers/fluorescence gate-dynamics measurements; single-molecule FRET D-loop disruption; single-molecule resection imaging with MRN\",\n      \"pmids\": [\"35102151\", \"35115525\", \"36529288\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How gate dynamics are coupled to BLM mechanochemistry in cells unclear\", \"In vivo determinants of pathway selection unmapped\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Refined RMI1's catalytic role to enhancing TopIIIα DNA binding/ssDNA trapping and open-cleaved-complex stabilization, extended TRR activity to processive supercoil relaxation linked to ultrafine bridge resolution, and identified RNF8 K63-ubiquitylation of RMI1 as the signal recruiting BTR to stalled forks.\",\n      \"evidence\": \"Magnetic/optical tweezers single-molecule kinetics with purified human complexes; Co-IP, site-mapping mutagenesis, foci, and fork-recovery assays\",\n      \"pmids\": [\"40266687\", \"41576078\", \"41784835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"UFB resolution role inferred from in vitro activity, not shown directly in cells\", \"Interplay of RNF8 ubiquitylation with sumoylation/phosphorylation untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple post-translational modifications of RMI1 (CDK1 phosphorylation, Smc5/6 sumoylation, RNF8/KNO1-linked ubiquitylation) are integrated to switch the dissolvasome between resection, dissolution, and degradation across the cell cycle remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking modifications to specific catalytic outputs\", \"Cross-talk between regulatory pathways untested\", \"Direct disease/Mendelian link for RMI1 not present in this corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13, 18, 31]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 6, 16]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 14, 25]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [3, 4, 11, 19, 25]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [14, 26, 33]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [9, 15, 21, 32]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [21, 24]}\n    ],\n    \"complexes\": [\"BTR/BLM-TopoIIIα-RMI1-RMI2 dissolvasome\", \"STR (Sgs1-Top3-Rmi1)\"],\n    \"partners\": [\"BLM\", \"TOP3A\", \"RMI2\", \"SGS1\", \"TOP3\", \"RPA\", \"RAD51\", \"RNF8\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}