{"gene":"HJURP","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2009,"finding":"HJURP forms a prenucleosomal complex with CENP-A, histone H4, and nucleophosmin 1, and is required for recruitment of new CENP-A into nucleosomes at replicated centromeres during G1 phase; HJURP recognition of CENP-A is mediated through the centromere targeting domain (CATD) of CENP-A.","method":"Co-immunoprecipitation, mass spectrometry, RNAi knockdown with CENP-A localization readout, cell-cycle fractionation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 — two independent labs (PMIDs 19410544 and 19410545) with orthogonal methods simultaneously established this finding","pmids":["19410544","19410545"],"is_preprint":false},{"year":2009,"finding":"HJURP centromeric localization is cell-cycle regulated, transiently appearing at centromeres coinciding precisely with the window for new CENP-A deposition; HJURP downregulation causes major reduction of CENP-A at centromeres and mitotic defects.","method":"Immunofluorescence, live-cell imaging, RNAi knockdown, cell-cycle analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — replicated across two independent labs simultaneously with clean KD/KO and specific cellular phenotype","pmids":["19410544","19410545"],"is_preprint":false},{"year":2010,"finding":"Bacterially expressed HJURP binds the CENP-A/H4 tetramer but not the H3/H4 tetramer at a stoichiometric ratio through a conserved N-terminal domain (CBD) containing a TLTY box; HJURP facilitates deposition of CENP-A/H4 tetramers onto naked DNA in vitro.","method":"In vitro binding assay with bacterially expressed proteins, in vitro chromatin assembly assay, mutagenesis of TLTY box","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis demonstrating specific binding interface","pmids":["20080577"],"is_preprint":false},{"year":2010,"finding":"H3K4me2 at the kinetochore is required for efficient HJURP recruitment and CENP-A incorporation; depletion of H3K4me2 via tethered LSD1 demethylase caused loss of HJURP recruitment and failure to incorporate new CENP-A, gradually inactivating the kinetochore.","method":"Epigenetic engineering (LSD1 tethering to HAC), ChIP, immunofluorescence, CENP-A incorporation assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 — direct epigenetic manipulation with functional kinetochore readout","pmids":["21157429"],"is_preprint":false},{"year":2011,"finding":"LacI-HJURP fusion drives stable recruitment of CENP-A to a LacO array at a non-centromeric locus, sufficient to direct assembly of a functional de novo centromere with CCAN proteins, NDC80, and stable kinetochore-microtubule attachments; the HJURP N-terminal fragment assembles CENP-A nucleosomes in vitro; HJURP centromere recruitment requires the Mis18 complex.","method":"LacI/LacO ectopic targeting, in vitro nucleosome assembly, immunofluorescence, kinetochore-microtubule attachment assay, RNAi epistasis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution plus ectopic targeting with functional centromere readout","pmids":["21768289"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of the HJURP–CENP-A–H4 complex reveals that HJURP binds a CENP-A/H4 heterodimer; the C-terminal β-sheet domain of HJURP caps the DNA-binding region of the heterodimer, preventing spontaneous DNA association; a novel CENP-A surface site distinct from H3 mediates HJURP binding specificity.","method":"X-ray crystallography, structure–function mutagenesis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional validation of binding interface","pmids":["21478274"],"is_preprint":false},{"year":2011,"finding":"Xenopus HJURP (xHJURP) is required for CENP-A deposition in a Xenopus egg extract system that recapitulates spatial and temporal specificity of human CENP-A deposition; human HJURP can substitute for xHJURP; condensin II (but not condensin I) is required for CENP-A assembly and retention of centromeric CENP-A nucleosomes.","method":"Xenopus egg extract in vitro system, immunodepletion, complementation with human HJURP, condensin I/II depletion","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — biochemical reconstitution in egg extract with immunodepletion and complementation","pmids":["21321101"],"is_preprint":false},{"year":2011,"finding":"Overexpression of HJURP causes chromosome loss and mitotic defects in human cells; in yeast, overexpression of Scm3 (HJURP ortholog) leads to premature separation of sister chromatids and reduction of Cse4p/H4 at centromeres; an N-terminal domain of Scm3 mediates centromeric DNA interaction and the chromosome loss phenotype.","method":"Overexpression in human cells and yeast, chromosome loss assay, ChIP, mutant allele analysis, genetic suppression","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — epistasis and domain mapping across two organisms with quantitative chromosome segregation readout","pmids":["21980305"],"is_preprint":false},{"year":2012,"finding":"Surface-exposed CATD residues of CENP-A are primary determinants for HJURP recognition, while buried CATD residues generating rigidity with H4 are required for efficient centromeric incorporation; HJURP contact points adjacent to CATD on CENP-A are used not for binding specificity but to transmit stability through histone fold domains of CENP-A and H4; an intact CENP-A/CENP-A interface is required for stable chromatin incorporation upon HJURP-mediated assembly.","method":"Mutagenesis of CENP-A surface/buried residues, in vitro binding assays, CENP-A incorporation assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 — systematic mutagenesis with reconstitution and cellular readout","pmids":["22406139"],"is_preprint":false},{"year":2013,"finding":"HJURP forms a homodimer through its C-terminal domain (including the second HJURP_C domain); HJURP exists as a dimer in the soluble preassembly complex and at chromatin during new CENP-A deposition; dimerization is essential for deposition of new CENP-A nucleosomes but not for HJURP recruitment to centromeres or CENP-A binding.","method":"Crystallography and biochemical assays for dimerization, separation-of-function mutations, CENP-A deposition assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — structural and biochemical data with separation-of-function mutants","pmids":["23771058"],"is_preprint":false},{"year":2013,"finding":"HJURP plays a role in regulating cellular senescence through a p53-dependent pathway; HJURP knockdown in young human fibroblasts and endothelial cells leads to premature senescence that is rescued by p53 knockdown but not p16 knockdown.","method":"RNAi knockdown, senescence assays, epistasis with p53/p16 knockdown","journal":"The journals of gerontology. Series A, Biological sciences and medical sciences","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with epistasis, single lab","pmids":["23292286"],"is_preprint":false},{"year":2014,"finding":"HJURP directly binds Mis18β through a minimal region mapped to residues 437–460; Mis18β depletion dramatically impairs HJURP recruitment to centromeres; CDK1 phosphorylation of HJURP weakens its interaction with Mis18β, providing temporal regulation of CENP-A deposition after mitosis.","method":"Co-IP, mapping of binding domain, RNAi, phosphomimetic/non-phosphorylatable mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP with domain mapping and CDK1 phosphorylation mechanistic follow-up","pmids":["24519934"],"is_preprint":false},{"year":2014,"finding":"Cell-cycle-dependent phosphorylation of HJURP by cyclin-dependent kinases controls its centromeric recruitment; a non-phosphorylatable HJURP mutant localizes prematurely to centromeres in S and G2 phase, causing premature CENP-A loading and cell-cycle delays; HJURP also possesses a DNA-binding domain required mechanistically for CenH3(CENP-A) loading.","method":"Phosphomimetic/non-phosphorylatable HJURP mutants, cell-cycle analysis, CENP-A deposition assay, DNA-binding domain mutagenesis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 — mutagenesis of phosphorylation sites with cell-cycle and deposition readouts, multiple orthogonal approaches","pmids":["25001279"],"is_preprint":false},{"year":2015,"finding":"The middle region of HJURP associates with the Mis18 complex protein M18BP1/KNL2, and this HJURP–M18BP1 association is required for HJURP function in centromere formation; HJURP also possesses a centromere expansion activity separable from its CENP-A-binding activity.","method":"DT40 knockout cell lines, gene replacement constructs, co-IP, ectopic HJURP targeting assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with complementation and separation-of-function analysis","pmids":["26063729"],"is_preprint":false},{"year":2016,"finding":"HJURP selectively associates with condensin II (not condensin I) and recruits CAPH2 (condensin II subunit) to early G1 centromeres; condensin II function at the centromere, dependent on HJURP, is required for new CENP-A deposition; HJURP induces decondensation of non-centromeric chromatin that is modulated by condensin II.","method":"Co-IP (selective condensin I/II pulldown), CAPH2 localization assay, LacO decondensation assay, condensin II depletion with CENP-A deposition readout","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP plus functional epistasis with deposition readout","pmids":["27807043"],"is_preprint":false},{"year":2018,"finding":"HJURP transiently associates with centromeres during S phase and binds to pre-existing CENP-A; HJURP is required for centromeric nucleosome inheritance during S phase; HJURP co-purifies with the MCM2-7 helicase complex and, together with MCM2 subunit, simultaneously binds CENP-A.","method":"BioID proximity labeling, co-purification, RNAi knockdown during S phase, CENP-A inheritance assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — BioID plus biochemical co-purification with functional S-phase knockdown readout","pmids":["30293838"],"is_preprint":false},{"year":2018,"finding":"HJURP destabilizes p21 via the MAPK/ERK1/2 and AKT/GSK3β pathways, which regulate nucleus-cytoplasm translocation and ubiquitin-mediated degradation of p21, promoting hepatocellular carcinoma cell proliferation.","method":"Co-IP, Western blot, pharmacological inhibitors (U0126, SC-79), RNAi, p21 knockdown rescue","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, pathway inhibitors with rescue, limited mechanistic detail on direct HJURP–p21 interaction","pmids":["30111352"],"is_preprint":false},{"year":2018,"finding":"HJURP antagonizes ectopic CENP-A deposition driven by H3.3 chaperones HIRA and DAXX; the balance between HJURP levels and CENP-A is essential to prevent ectopic CENP-A assembly by H3.3 chaperones.","method":"RNAi knockdown/overexpression, ChIP, immunofluorescence in human cancer cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 — single lab with knockdown/overexpression and ChIP, moderate mechanistic detail","pmids":["30365520"],"is_preprint":false},{"year":2019,"finding":"Two repeats in human HJURP proposed to be functionally distinct are interchangeable and bind concomitantly to the 4:2:2 Mis18α:Mis18β:M18BP1 complex without dissociating it; the Mis18α N-terminal tails block two identical HJURP-repeat binding sites near Mis18αβ C-terminal helices, identified by photo-cross-linking; HJURP binds CENP-A:H4 dimers, implying tetramer assembly requires two Mis18αβ:M18BP1:HJURP complexes or consecutive rounds.","method":"Biochemical reconstitution, photo-cross-linking, site-directed mutagenesis, size exclusion chromatography","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with photo-cross-linking and mutagenesis","pmids":["31492860"],"is_preprint":false},{"year":2019,"finding":"Super-resolution microscopy reveals that CENP-A nucleosomes form rosette-like clusters (~250–300 nm) during G1 with HJURP located at the center, serving as a nucleation point for CENP-A deposition.","method":"2D and 3D super-resolution microscopy (STORM/PALM), co-localization analysis, segmentation analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — direct super-resolution localization with quantitative co-localization","pmids":["31570711"],"is_preprint":false},{"year":2020,"finding":"The CENP-A-HJURP binding interface differs between chicken and human, with W53 of HJURP being an essential contact for chicken CENP-A A59; two arginine residues introduced to the chicken HJURP αA-helix suppress mis-incorporation caused by CENP-A A59Q mutation, explaining species-specific binding affinity.","method":"In vivo mutagenesis in chicken DT40 cells, CENP-A incorporation assay, binding affinity measurements","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 — systematic mutagenesis with structure–function correlation and complementation","pmids":["33207191"],"is_preprint":false},{"year":2021,"finding":"HJURP increases ubiquitination of CDKN1A (p21) via the GSK3β/JNK signaling pathway, decreasing p21 stability and promoting prostate cancer cell proliferation.","method":"Co-IP, ubiquitination assay, Western blot, RNAi, overexpression, in vivo xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 — single lab with co-IP and ubiquitination assay, indirect pathway evidence","pmids":["34099634"],"is_preprint":false},{"year":2022,"finding":"HJURP affects ubiquitination of YAP1 protein, regulating its stability and downstream transcriptional activity; YAP1 in turn positively regulates NDRG1 transcription by binding its promoter, establishing an HJURP/YAP1/NDRG1 axis in triple-negative breast cancer.","method":"Co-IP, ubiquitination assay, promoter binding assay, RNAi, overexpression","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, co-IP with ubiquitination assay and promoter binding, limited mechanistic detail on direct HJURP–YAP1 interaction","pmids":["35459269"],"is_preprint":false},{"year":2023,"finding":"HJURP phosphorylation prevents interaction between HJURP and CENP-C in metaphase, blocking delivery of soluble CENP-A to centromeres; M18BP1.S competitively inhibits HJURP access to CENP-C at centromeres; removal of both inhibitory activities causes CENP-A assembly in metaphase.","method":"Cell-free X. laevis egg extract centromere assembly system, non-phosphorylatable HJURP mutants, competitive inhibition assay, CENP-A deposition readout","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — cell-free reconstitution with phospho-mutants and competitive inhibition in egg extract","pmids":["37141119"],"is_preprint":false},{"year":2024,"finding":"HJURP is recruited to DNA double-strand breaks (DSBs) via a mechanism requiring chromatin PARylation; at DSBs, HJURP promotes turnover of H3K9me3 and HP1, facilitating DNA damage signaling and DSB repair; HJURP overexpression globally alters heterochromatin structure and increases radioresistance.","method":"Immunofluorescence at DSB sites, PARP inhibition, H3K9me3/HP1 ChIP, HJURP overexpression/knockdown with DNA repair readout","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct localization to DSBs with mechanistic ChIP readout, single lab","pmids":["38279062"],"is_preprint":false},{"year":2024,"finding":"HJURP forms disulfide-linked intermediates with PRDX1 through Cys327 and Cys457 residues, promoting PRDX1 redox cycling, inhibiting PRDX1 hyperoxidation, enhancing PRDX1 peroxidase activity, reducing ROS levels, and suppressing ferroptosis in prostate cancer cells.","method":"Co-IP, disulfide bond trapping, cysteine mutagenesis, peroxidase activity assay, ROS measurement, ferroptosis assay in vitro and in vivo","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1–2 — biochemical disulfide trapping with site-directed mutagenesis and enzymatic activity assay","pmids":["39405980"],"is_preprint":false},{"year":2007,"finding":"HJURP (then called clone 546/FAKTS) localizes to the nucleus of mammalian cells and interacts with 14-3-3 proteins in a manner enhanced by activated Akt/PKB; Ser479 is the predominant residue mediating this interaction, and AKT/PKB phosphorylates this site.","method":"Yeast two-hybrid, confocal microscopy, co-IP in mammalian cells, site-directed mutagenesis (S479A), Akt expression","journal":"Proteins","confidence":"Medium","confidence_rationale":"Tier 2–3 — reciprocal co-IP with mutagenesis confirming phosphorylation-dependent interaction, single lab","pmids":["17256767"],"is_preprint":false},{"year":2025,"finding":"HJURP directly binds to the C-terminal domain of CENP-C in vitro; this interaction is essential for new CENP-A incorporation; CENP-C and Mis18 complex provide dual recruitment pathways for HJURP at centromeres, and CENP-C, HJURP, and Mis18C form a tight association in the chromatin fraction.","method":"In vitro binding assay, Mis18 complex KO cells with HJURP CENP-C-binding mutant, co-IP from chromatin fraction in DT40 cells","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro binding with genetic epistasis in KO cells, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.10.05.680587"],"is_preprint":true},{"year":2025,"finding":"Under replication stress, ATR promotes CENP-A eviction from centromeres by recruiting VCP (AAA+ ATPase) to destabilize CENP-A nucleosomes; HJURP (but not DAXX or ATRX) is required for nucleolar relocalization of displaced CENP-A.","method":"Replication stress induction, ATR inhibition, VCP depletion, HJURP/DAXX/ATRX knockdown, immunofluorescence for CENP-A localization","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — genetic dissection of pathway with specific phenotypic readout, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.10.20.683416"],"is_preprint":true}],"current_model":"HJURP is a cell-cycle-regulated CENP-A-specific histone chaperone that binds CENP-A/H4 heterodimers through its conserved N-terminal CBD/Scm3-like domain (structurally confirmed by crystal structure), forms homodimers through its C-terminal domain to enable octameric nucleosome assembly, and is recruited to centromeres in early G1 via dual pathways involving the Mis18 complex (Mis18α/β/M18BP1) and CENP-C, where it deposits new CENP-A nucleosomes; CDK-dependent phosphorylation of HJURP restricts this activity to telophase/G1 by preventing premature interaction with CENP-C, while during S phase HJURP also associates with the MCM2-7 helicase to facilitate inheritance of pre-existing CENP-A nucleosomes through DNA replication; additionally, HJURP is recruited to DNA double-strand breaks via PARylation-dependent mechanisms to promote chromatin reorganization and DSB repair, and interacts with PRDX1 via disulfide bonds to enhance its peroxidase activity and suppress ferroptosis."},"narrative":{"teleology":[{"year":2007,"claim":"Before its centromeric role was known, the initial characterization established that HJURP is a nuclear protein whose interaction with 14-3-3 proteins is regulated by Akt/PKB-dependent phosphorylation at Ser479, hinting at signaling-responsive regulation.","evidence":"Yeast two-hybrid, co-IP, site-directed mutagenesis of S479A in mammalian cells","pmids":["17256767"],"confidence":"Medium","gaps":["Functional consequence of 14-3-3 binding for HJURP activity unknown","Relationship to centromere function not yet recognized"]},{"year":2009,"claim":"Two simultaneous studies resolved the long-standing question of how new CENP-A is deposited at centromeres after replication, establishing HJURP as the dedicated CENP-A chaperone that forms a prenucleosomal complex with CENP-A/H4 and is required for G1-phase CENP-A loading via recognition of the CATD.","evidence":"Co-IP, mass spectrometry, RNAi with CENP-A localization readout, cell-cycle fractionation, live-cell imaging in two independent labs","pmids":["19410544","19410545"],"confidence":"High","gaps":["Structural basis of CENP-A recognition not yet determined","Mechanism of centromeric recruitment unknown"]},{"year":2010,"claim":"In vitro reconstitution demonstrated that HJURP directly and stoichiometrically binds CENP-A/H4 (but not H3/H4) through a conserved N-terminal CBD containing a TLTY motif, and can deposit CENP-A/H4 onto naked DNA, establishing its intrinsic chaperone activity independent of other centromere factors.","evidence":"Bacterially expressed protein binding assays, in vitro chromatin assembly, TLTY box mutagenesis","pmids":["20080577"],"confidence":"High","gaps":["Atomic-resolution structure of the HJURP–CENP-A–H4 complex not yet available","Epigenetic requirements for centromeric targeting not addressed"]},{"year":2010,"claim":"The discovery that H3K4me2 at centromeric chromatin is required for HJURP recruitment revealed an upstream epigenetic prerequisite for CENP-A deposition, linking histone modification state to chaperone access.","evidence":"LSD1 demethylase tethering to human artificial chromosome, ChIP, CENP-A incorporation assay","pmids":["21157429"],"confidence":"High","gaps":["Direct mechanism by which H3K4me2 promotes HJURP binding unknown","Whether HJURP reads the mark directly or via an intermediary unclear"]},{"year":2011,"claim":"The crystal structure of the HJURP–CENP-A–H4 ternary complex resolved how HJURP achieves specificity: it binds a CENP-A/H4 heterodimer (not tetramer), with its C-terminal β-sheet capping the DNA-binding region to prevent premature nucleosome formation, and contacts a CENP-A surface distinct from canonical H3.","evidence":"X-ray crystallography with structure–function mutagenesis","pmids":["21478274"],"confidence":"High","gaps":["How the heterodimer-bound state transitions to octameric nucleosome not explained","In vivo validation of specific structural contacts limited"]},{"year":2011,"claim":"Ectopic targeting of HJURP to a non-centromeric locus was sufficient to build a functional de novo centromere with full kinetochore assembly and microtubule attachment, proving HJURP is the rate-limiting activity for centromere specification; recruitment required the Mis18 complex, identifying the upstream licensing step.","evidence":"LacI/LacO ectopic targeting, in vitro nucleosome assembly, kinetochore-microtubule attachment assay, RNAi epistasis","pmids":["21768289"],"confidence":"High","gaps":["Direct binding interface between HJURP and Mis18 components not mapped","Mechanism by which Mis18 licenses HJURP centromeric access unknown"]},{"year":2011,"claim":"Conservation of the HJURP/Scm3 mechanism was established: Xenopus HJURP is functionally interchangeable with human HJURP in egg extracts, and condensin II (but not condensin I) was identified as a required cofactor for CENP-A retention.","evidence":"Xenopus egg extract immunodepletion and complementation, condensin I/II selective depletion","pmids":["21321101"],"confidence":"High","gaps":["Direct physical interaction between HJURP and condensin II not demonstrated"]},{"year":2012,"claim":"Systematic mutagenesis of CENP-A dissected the HJURP recognition code: surface-exposed CATD residues drive HJURP binding specificity, while buried CATD residues enforce rigidity needed for chromatin incorporation, and an intact CENP-A/CENP-A dimerization interface is required for stable nucleosome assembly after HJURP-mediated deposition.","evidence":"Surface and buried residue mutagenesis of CENP-A, in vitro binding and chromatin incorporation assays","pmids":["22406139"],"confidence":"High","gaps":["How HJURP releases CENP-A during the deposition step not resolved"]},{"year":2013,"claim":"The discovery that HJURP homodimerizes through its C-terminal domain solved the heterodimer-to-octamer paradox: since each HJURP monomer binds one CENP-A/H4 dimer, dimerization brings two CENP-A/H4 dimers together for nucleosome assembly; dimerization is required for deposition but dispensable for centromere recruitment or CENP-A binding.","evidence":"Crystallography of the C-terminal dimerization domain, separation-of-function mutations, CENP-A deposition assay","pmids":["23771058"],"confidence":"High","gaps":["Kinetics and directionality of the HJURP dimer-mediated assembly reaction in vivo not characterized"]},{"year":2014,"claim":"CDK-dependent phosphorylation was established as the temporal gating mechanism: phosphorylated HJURP cannot bind Mis18β, restricting centromere recruitment to the post-mitotic window; a non-phosphorylatable HJURP mutant loads CENP-A prematurely in S/G2 phase. HJURP also contains a DNA-binding domain required for CENP-A loading.","evidence":"Phosphomimetic and non-phosphorylatable mutants, co-IP mapping of HJURP-Mis18β interaction (residues 437–460), cell-cycle analysis","pmids":["24519934","25001279"],"confidence":"High","gaps":["Whether CDK1 or CDK2 is the primary kinase in vivo debated","Structural basis of phosphorylation-dependent inhibition of Mis18β binding not resolved"]},{"year":2015,"claim":"Genetic dissection in DT40 cells mapped a separable HJURP–M18BP1 interaction domain and demonstrated that HJURP possesses a centromere expansion activity independent of its CENP-A binding function, revealing modular domain architecture.","evidence":"DT40 knockout with gene replacement, separation-of-function constructs, co-IP","pmids":["26063729"],"confidence":"High","gaps":["Molecular mechanism of the centromere expansion activity unknown"]},{"year":2016,"claim":"HJURP was shown to directly bind condensin II (not condensin I) and recruit the CAPH2 subunit to centromeres in early G1, functionally linking condensin II-mediated chromatin remodeling to CENP-A deposition.","evidence":"Selective condensin I/II co-IP, CAPH2 localization, LacO chromatin decondensation assay, epistasis with condensin II depletion","pmids":["27807043"],"confidence":"High","gaps":["Whether condensin II remodeling is catalytic or structural at centromeres unknown","Direct binding interface not mapped"]},{"year":2018,"claim":"A new S-phase role was uncovered: HJURP transiently associates with centromeres during replication and co-purifies with the MCM2-7 helicase, and is required for inheritance of pre-existing CENP-A nucleosomes through the replication fork, establishing a dual-phase function for the chaperone.","evidence":"BioID proximity labeling, co-purification with MCM2, RNAi during S phase with CENP-A inheritance readout","pmids":["30293838"],"confidence":"High","gaps":["Whether HJURP directly binds MCM2 or acts through an intermediary not fully resolved","Stoichiometry and topology of the HJURP-MCM2-CENP-A complex unknown"]},{"year":2019,"claim":"Biochemical reconstitution of the full Mis18 complex with HJURP revealed that two HJURP repeats are functionally interchangeable and bind to a 4:2:2 Mis18α:Mis18β:M18BP1 complex; Mis18α N-terminal tails gate HJURP access to binding sites near the Mis18αβ C-terminal helices, defining the molecular licensing mechanism.","evidence":"Photo-cross-linking, size exclusion chromatography, site-directed mutagenesis of reconstituted complexes","pmids":["31492860"],"confidence":"High","gaps":["How Mis18α autoinhibition is relieved in vivo not determined","Whether both HJURP binding sites are occupied simultaneously in cells unknown"]},{"year":2019,"claim":"Super-resolution imaging placed HJURP at the physical center of rosette-like CENP-A nucleosome clusters during G1, providing nanoscale spatial evidence that HJURP acts as the nucleation point for centromeric chromatin assembly.","evidence":"2D/3D STORM/PALM super-resolution microscopy with quantitative co-localization","pmids":["31570711"],"confidence":"High","gaps":["Dynamic assembly sequence not captured by fixed-cell imaging"]},{"year":2023,"claim":"A dual-lock timing model was established: CDK phosphorylation prevents the HJURP–CENP-C interaction in metaphase, while M18BP1.S competitively blocks HJURP access to CENP-C; removal of both inhibitory pathways causes ectopic CENP-A assembly in metaphase, revealing CENP-C as a direct centromeric receptor for HJURP.","evidence":"Cell-free Xenopus egg extract, non-phosphorylatable HJURP mutants, competitive inhibition assay with CENP-A deposition readout","pmids":["37141119"],"confidence":"High","gaps":["Structural basis of HJURP–CENP-C interaction not yet resolved","Whether this mechanism is fully conserved in mammals not tested"]},{"year":2024,"claim":"An unexpected non-centromeric function was established: HJURP is recruited to DNA double-strand breaks through PARylation-dependent mechanisms, where it promotes turnover of H3K9me3 and HP1 to facilitate DSB repair and confer radioresistance.","evidence":"Immunofluorescence at laser-induced DSBs, PARP inhibition, H3K9me3/HP1 ChIP, HJURP overexpression/knockdown with DNA repair readout","pmids":["38279062"],"confidence":"Medium","gaps":["Whether HJURP deposits CENP-A at DSBs or acts through a CENP-A-independent mechanism not resolved","PAR-binding domain of HJURP not identified","Single lab finding not yet independently replicated"]},{"year":2024,"claim":"A redox-regulatory function was discovered: HJURP forms disulfide-linked intermediates with PRDX1 through specific cysteine residues (C327, C457), promoting PRDX1 redox cycling, preventing hyperoxidation, and suppressing ferroptosis in prostate cancer cells.","evidence":"Disulfide bond trapping, cysteine mutagenesis, peroxidase activity assay, ROS measurement, ferroptosis assay in vitro and in vivo","pmids":["39405980"],"confidence":"High","gaps":["Physiological context of HJURP-PRDX1 interaction beyond cancer unclear","Whether this function is connected to centromere biology or entirely independent unknown"]},{"year":null,"claim":"Key open questions include the structural basis of the HJURP–CENP-C interaction, the mechanism by which HJURP coordinates with the MCM2-7 helicase during replication-coupled CENP-A recycling, whether the DSB repair and PRDX1 redox functions operate through CENP-A-dependent or -independent mechanisms, and how HJURP release from assembled CENP-A nucleosomes is triggered.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of HJURP–CENP-C complex","MCM2-HJURP-CENP-A ternary complex architecture undetermined","CENP-A dependence of DSB and redox roles not tested","HJURP nucleosome release mechanism unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[0,2,5,6,8,9]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0,2,5,8]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[12]},{"term_id":"GO:0016209","term_label":"antioxidant activity","supporting_discovery_ids":[25]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,26]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[1,4,19]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,9]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,11,12,23]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,4,5,9,14]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[24]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[15]}],"complexes":["HJURP-CENP-A/H4 prenucleosomal complex","Mis18α/Mis18β/M18BP1-HJURP licensing complex"],"partners":["CENPA","HJURP","MIS18BP1","MIS18B","CENPC","MCM2","CAPH2","PRDX1"],"other_free_text":[]},"mechanistic_narrative":"HJURP is the dedicated histone chaperone for the centromere-specific histone H3 variant CENP-A, essential for both de novo CENP-A deposition in early G1 and inheritance of CENP-A nucleosomes during S-phase DNA replication. Its conserved N-terminal CENP-A binding domain (CBD) recognizes the CATD of CENP-A/H4 heterodimers with high specificity, capping the DNA-binding surface to prevent premature nucleosome formation, while its C-terminal dimerization domain enables assembly of octameric CENP-A nucleosomes [PMID:19410544, PMID:21478274, PMID:23771058]. HJURP is recruited to centromeres through dual pathways involving the Mis18 complex (Mis18α/β and M18BP1) and CENP-C, with CDK-dependent phosphorylation restricting centromeric access to telophase/G1 by blocking the HJURP–CENP-C interaction [PMID:24519934, PMID:37141119, PMID:31492860]; during S phase, HJURP cooperates with the MCM2-7 helicase to recycle parental CENP-A nucleosomes through replication forks [PMID:30293838]. Beyond centromere biology, HJURP is recruited to DNA double-strand breaks via PARylation-dependent mechanisms to promote heterochromatin remodeling and DSB repair, and forms disulfide-linked intermediates with PRDX1 to enhance peroxidase activity and suppress ferroptosis [PMID:38279062, PMID:39405980]."},"prefetch_data":{"uniprot":{"accession":"Q8NCD3","full_name":"Holliday junction recognition protein","aliases":["14-3-3-associated AKT substrate","Fetal liver-expressing gene 1 protein","Up-regulated in lung cancer 9"],"length_aa":748,"mass_kda":83.5,"function":"Centromeric protein that plays a central role in the incorporation and maintenance of histone H3-like variant CENPA at centromeres. Acts as a specific chaperone for CENPA and is required for the incorporation of newly synthesized CENPA molecules into nucleosomes at replicated centromeres. Prevents CENPA-H4 tetramerization and prevents premature DNA binding by the CENPA-H4 tetramer. Directly binds Holliday junctions","subcellular_location":"Nucleus, nucleolus; Chromosome, centromere","url":"https://www.uniprot.org/uniprotkb/Q8NCD3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/HJURP","classification":"Common Essential","n_dependent_lines":1043,"n_total_lines":1208,"dependency_fraction":0.8634105960264901},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CENPA","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/HJURP","total_profiled":1310},"omim":[{"mim_id":"618137","title":"MIS18 KINETOCHORE PROTEIN A: MIS18A","url":"https://www.omim.org/entry/618137"},{"mim_id":"612667","title":"HOLLIDAY JUNCTION RECOGNITION PROTEIN; HJURP","url":"https://www.omim.org/entry/612667"},{"mim_id":"606020","title":"OPA-INTERACTING PROTEIN 5; OIP5","url":"https://www.omim.org/entry/606020"},{"mim_id":"602098","title":"POLO-LIKE KINASE 1; PLK1","url":"https://www.omim.org/entry/602098"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":44.7},{"tissue":"lymphoid tissue","ntpm":28.3}],"url":"https://www.proteinatlas.org/search/HJURP"},"hgnc":{"alias_symbol":["DKFZp762E1312","URLC9","hFLEG1","FAKTS"],"prev_symbol":[]},"alphafold":{"accession":"Q8NCD3","domains":[{"cath_id":"-","chopping":"46-75","consensus_level":"medium","plddt":79.9337,"start":46,"end":75},{"cath_id":"1.20.5","chopping":"11-43","consensus_level":"medium","plddt":87.0355,"start":11,"end":43}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NCD3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NCD3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NCD3-F1-predicted_aligned_error_v6.png","plddt_mean":45.59},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HJURP","jax_strain_url":"https://www.jax.org/strain/search?query=HJURP"},"sequence":{"accession":"Q8NCD3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NCD3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NCD3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NCD3"}},"corpus_meta":[{"pmid":"19410544","id":"PMC_19410544","title":"Centromere-specific 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HJURP (Holliday Junction-Recognizing Protein) levels is correlated with glioblastoma cells survival.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23638004","citation_count":42,"is_preprint":false},{"pmid":"26063729","id":"PMC_26063729","title":"HJURP is involved in the expansion of centromeric chromatin.","date":"2015","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/26063729","citation_count":37,"is_preprint":false},{"pmid":"28819432","id":"PMC_28819432","title":"Silencing of HJURP induces dysregulation of cell cycle and ROS metabolism in bladder cancer cells via PPARγ-SIRT1 feedback loop.","date":"2017","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/28819432","citation_count":36,"is_preprint":false},{"pmid":"31115012","id":"PMC_31115012","title":"Knockdown of HJURP inhibits non-small cell lung cancer cell proliferation, migration, and invasion by repressing Wnt/β-catenin 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centromeres","date":"2025-10-06","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.05.680587","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.20.683416","title":"ATR promotes genome instability via CENP-A eviction from centromeres under replication stress","date":"2025-10-20","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.20.683416","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.06.27.661933","title":"M18BP1 valency and a distributed interaction footprint determine epigenetic centromere specification in humans","date":"2025-06-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.27.661933","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.05.23.655122","title":"Replication stress alters CENP-A nucleosome stability during S phase","date":"2025-05-28","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.23.655122","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.05.14.653945","title":"A Systems Biology Approach to Unveil Shared Therapeutic Targets and Pathological Pathways Across Major Human Cancers","date":"2025-05-17","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.14.653945","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.02.03.636285","title":"Evolution and instability of human centromeres are accelerated by heterochromatin boundary loss and CENP-A overexpression","date":"2025-02-03","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.03.636285","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.26.605363","title":"Evidence of centromeric histone 3 chaperone involved in DNA damage repair pathway","date":"2024-07-27","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.26.605363","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":26392,"output_tokens":6773,"usd":0.090385},"stage2":{"model":"claude-opus-4-6","input_tokens":10534,"output_tokens":4653,"usd":0.253493},"total_usd":0.343878,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"HJURP forms a prenucleosomal complex with CENP-A, histone H4, and nucleophosmin 1, and is required for recruitment of new CENP-A into nucleosomes at replicated centromeres during G1 phase; HJURP recognition of CENP-A is mediated through the centromere targeting domain (CATD) of CENP-A.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, RNAi knockdown with CENP-A localization readout, cell-cycle fractionation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — two independent labs (PMIDs 19410544 and 19410545) with orthogonal methods simultaneously established this finding\",\n      \"pmids\": [\"19410544\", \"19410545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HJURP centromeric localization is cell-cycle regulated, transiently appearing at centromeres coinciding precisely with the window for new CENP-A deposition; HJURP downregulation causes major reduction of CENP-A at centromeres and mitotic defects.\",\n      \"method\": \"Immunofluorescence, live-cell imaging, RNAi knockdown, cell-cycle analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated across two independent labs simultaneously with clean KD/KO and specific cellular phenotype\",\n      \"pmids\": [\"19410544\", \"19410545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Bacterially expressed HJURP binds the CENP-A/H4 tetramer but not the H3/H4 tetramer at a stoichiometric ratio through a conserved N-terminal domain (CBD) containing a TLTY box; HJURP facilitates deposition of CENP-A/H4 tetramers onto naked DNA in vitro.\",\n      \"method\": \"In vitro binding assay with bacterially expressed proteins, in vitro chromatin assembly assay, mutagenesis of TLTY box\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis demonstrating specific binding interface\",\n      \"pmids\": [\"20080577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"H3K4me2 at the kinetochore is required for efficient HJURP recruitment and CENP-A incorporation; depletion of H3K4me2 via tethered LSD1 demethylase caused loss of HJURP recruitment and failure to incorporate new CENP-A, gradually inactivating the kinetochore.\",\n      \"method\": \"Epigenetic engineering (LSD1 tethering to HAC), ChIP, immunofluorescence, CENP-A incorporation assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct epigenetic manipulation with functional kinetochore readout\",\n      \"pmids\": [\"21157429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LacI-HJURP fusion drives stable recruitment of CENP-A to a LacO array at a non-centromeric locus, sufficient to direct assembly of a functional de novo centromere with CCAN proteins, NDC80, and stable kinetochore-microtubule attachments; the HJURP N-terminal fragment assembles CENP-A nucleosomes in vitro; HJURP centromere recruitment requires the Mis18 complex.\",\n      \"method\": \"LacI/LacO ectopic targeting, in vitro nucleosome assembly, immunofluorescence, kinetochore-microtubule attachment assay, RNAi epistasis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution plus ectopic targeting with functional centromere readout\",\n      \"pmids\": [\"21768289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of the HJURP–CENP-A–H4 complex reveals that HJURP binds a CENP-A/H4 heterodimer; the C-terminal β-sheet domain of HJURP caps the DNA-binding region of the heterodimer, preventing spontaneous DNA association; a novel CENP-A surface site distinct from H3 mediates HJURP binding specificity.\",\n      \"method\": \"X-ray crystallography, structure–function mutagenesis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional validation of binding interface\",\n      \"pmids\": [\"21478274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Xenopus HJURP (xHJURP) is required for CENP-A deposition in a Xenopus egg extract system that recapitulates spatial and temporal specificity of human CENP-A deposition; human HJURP can substitute for xHJURP; condensin II (but not condensin I) is required for CENP-A assembly and retention of centromeric CENP-A nucleosomes.\",\n      \"method\": \"Xenopus egg extract in vitro system, immunodepletion, complementation with human HJURP, condensin I/II depletion\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical reconstitution in egg extract with immunodepletion and complementation\",\n      \"pmids\": [\"21321101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Overexpression of HJURP causes chromosome loss and mitotic defects in human cells; in yeast, overexpression of Scm3 (HJURP ortholog) leads to premature separation of sister chromatids and reduction of Cse4p/H4 at centromeres; an N-terminal domain of Scm3 mediates centromeric DNA interaction and the chromosome loss phenotype.\",\n      \"method\": \"Overexpression in human cells and yeast, chromosome loss assay, ChIP, mutant allele analysis, genetic suppression\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis and domain mapping across two organisms with quantitative chromosome segregation readout\",\n      \"pmids\": [\"21980305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Surface-exposed CATD residues of CENP-A are primary determinants for HJURP recognition, while buried CATD residues generating rigidity with H4 are required for efficient centromeric incorporation; HJURP contact points adjacent to CATD on CENP-A are used not for binding specificity but to transmit stability through histone fold domains of CENP-A and H4; an intact CENP-A/CENP-A interface is required for stable chromatin incorporation upon HJURP-mediated assembly.\",\n      \"method\": \"Mutagenesis of CENP-A surface/buried residues, in vitro binding assays, CENP-A incorporation assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis with reconstitution and cellular readout\",\n      \"pmids\": [\"22406139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HJURP forms a homodimer through its C-terminal domain (including the second HJURP_C domain); HJURP exists as a dimer in the soluble preassembly complex and at chromatin during new CENP-A deposition; dimerization is essential for deposition of new CENP-A nucleosomes but not for HJURP recruitment to centromeres or CENP-A binding.\",\n      \"method\": \"Crystallography and biochemical assays for dimerization, separation-of-function mutations, CENP-A deposition assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural and biochemical data with separation-of-function mutants\",\n      \"pmids\": [\"23771058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HJURP plays a role in regulating cellular senescence through a p53-dependent pathway; HJURP knockdown in young human fibroblasts and endothelial cells leads to premature senescence that is rescued by p53 knockdown but not p16 knockdown.\",\n      \"method\": \"RNAi knockdown, senescence assays, epistasis with p53/p16 knockdown\",\n      \"journal\": \"The journals of gerontology. Series A, Biological sciences and medical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with epistasis, single lab\",\n      \"pmids\": [\"23292286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HJURP directly binds Mis18β through a minimal region mapped to residues 437–460; Mis18β depletion dramatically impairs HJURP recruitment to centromeres; CDK1 phosphorylation of HJURP weakens its interaction with Mis18β, providing temporal regulation of CENP-A deposition after mitosis.\",\n      \"method\": \"Co-IP, mapping of binding domain, RNAi, phosphomimetic/non-phosphorylatable mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with domain mapping and CDK1 phosphorylation mechanistic follow-up\",\n      \"pmids\": [\"24519934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cell-cycle-dependent phosphorylation of HJURP by cyclin-dependent kinases controls its centromeric recruitment; a non-phosphorylatable HJURP mutant localizes prematurely to centromeres in S and G2 phase, causing premature CENP-A loading and cell-cycle delays; HJURP also possesses a DNA-binding domain required mechanistically for CenH3(CENP-A) loading.\",\n      \"method\": \"Phosphomimetic/non-phosphorylatable HJURP mutants, cell-cycle analysis, CENP-A deposition assay, DNA-binding domain mutagenesis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mutagenesis of phosphorylation sites with cell-cycle and deposition readouts, multiple orthogonal approaches\",\n      \"pmids\": [\"25001279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The middle region of HJURP associates with the Mis18 complex protein M18BP1/KNL2, and this HJURP–M18BP1 association is required for HJURP function in centromere formation; HJURP also possesses a centromere expansion activity separable from its CENP-A-binding activity.\",\n      \"method\": \"DT40 knockout cell lines, gene replacement constructs, co-IP, ectopic HJURP targeting assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with complementation and separation-of-function analysis\",\n      \"pmids\": [\"26063729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HJURP selectively associates with condensin II (not condensin I) and recruits CAPH2 (condensin II subunit) to early G1 centromeres; condensin II function at the centromere, dependent on HJURP, is required for new CENP-A deposition; HJURP induces decondensation of non-centromeric chromatin that is modulated by condensin II.\",\n      \"method\": \"Co-IP (selective condensin I/II pulldown), CAPH2 localization assay, LacO decondensation assay, condensin II depletion with CENP-A deposition readout\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus functional epistasis with deposition readout\",\n      \"pmids\": [\"27807043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HJURP transiently associates with centromeres during S phase and binds to pre-existing CENP-A; HJURP is required for centromeric nucleosome inheritance during S phase; HJURP co-purifies with the MCM2-7 helicase complex and, together with MCM2 subunit, simultaneously binds CENP-A.\",\n      \"method\": \"BioID proximity labeling, co-purification, RNAi knockdown during S phase, CENP-A inheritance assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — BioID plus biochemical co-purification with functional S-phase knockdown readout\",\n      \"pmids\": [\"30293838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HJURP destabilizes p21 via the MAPK/ERK1/2 and AKT/GSK3β pathways, which regulate nucleus-cytoplasm translocation and ubiquitin-mediated degradation of p21, promoting hepatocellular carcinoma cell proliferation.\",\n      \"method\": \"Co-IP, Western blot, pharmacological inhibitors (U0126, SC-79), RNAi, p21 knockdown rescue\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, pathway inhibitors with rescue, limited mechanistic detail on direct HJURP–p21 interaction\",\n      \"pmids\": [\"30111352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HJURP antagonizes ectopic CENP-A deposition driven by H3.3 chaperones HIRA and DAXX; the balance between HJURP levels and CENP-A is essential to prevent ectopic CENP-A assembly by H3.3 chaperones.\",\n      \"method\": \"RNAi knockdown/overexpression, ChIP, immunofluorescence in human cancer cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab with knockdown/overexpression and ChIP, moderate mechanistic detail\",\n      \"pmids\": [\"30365520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Two repeats in human HJURP proposed to be functionally distinct are interchangeable and bind concomitantly to the 4:2:2 Mis18α:Mis18β:M18BP1 complex without dissociating it; the Mis18α N-terminal tails block two identical HJURP-repeat binding sites near Mis18αβ C-terminal helices, identified by photo-cross-linking; HJURP binds CENP-A:H4 dimers, implying tetramer assembly requires two Mis18αβ:M18BP1:HJURP complexes or consecutive rounds.\",\n      \"method\": \"Biochemical reconstitution, photo-cross-linking, site-directed mutagenesis, size exclusion chromatography\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with photo-cross-linking and mutagenesis\",\n      \"pmids\": [\"31492860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Super-resolution microscopy reveals that CENP-A nucleosomes form rosette-like clusters (~250–300 nm) during G1 with HJURP located at the center, serving as a nucleation point for CENP-A deposition.\",\n      \"method\": \"2D and 3D super-resolution microscopy (STORM/PALM), co-localization analysis, segmentation analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct super-resolution localization with quantitative co-localization\",\n      \"pmids\": [\"31570711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The CENP-A-HJURP binding interface differs between chicken and human, with W53 of HJURP being an essential contact for chicken CENP-A A59; two arginine residues introduced to the chicken HJURP αA-helix suppress mis-incorporation caused by CENP-A A59Q mutation, explaining species-specific binding affinity.\",\n      \"method\": \"In vivo mutagenesis in chicken DT40 cells, CENP-A incorporation assay, binding affinity measurements\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — systematic mutagenesis with structure–function correlation and complementation\",\n      \"pmids\": [\"33207191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HJURP increases ubiquitination of CDKN1A (p21) via the GSK3β/JNK signaling pathway, decreasing p21 stability and promoting prostate cancer cell proliferation.\",\n      \"method\": \"Co-IP, ubiquitination assay, Western blot, RNAi, overexpression, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab with co-IP and ubiquitination assay, indirect pathway evidence\",\n      \"pmids\": [\"34099634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HJURP affects ubiquitination of YAP1 protein, regulating its stability and downstream transcriptional activity; YAP1 in turn positively regulates NDRG1 transcription by binding its promoter, establishing an HJURP/YAP1/NDRG1 axis in triple-negative breast cancer.\",\n      \"method\": \"Co-IP, ubiquitination assay, promoter binding assay, RNAi, overexpression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, co-IP with ubiquitination assay and promoter binding, limited mechanistic detail on direct HJURP–YAP1 interaction\",\n      \"pmids\": [\"35459269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HJURP phosphorylation prevents interaction between HJURP and CENP-C in metaphase, blocking delivery of soluble CENP-A to centromeres; M18BP1.S competitively inhibits HJURP access to CENP-C at centromeres; removal of both inhibitory activities causes CENP-A assembly in metaphase.\",\n      \"method\": \"Cell-free X. laevis egg extract centromere assembly system, non-phosphorylatable HJURP mutants, competitive inhibition assay, CENP-A deposition readout\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cell-free reconstitution with phospho-mutants and competitive inhibition in egg extract\",\n      \"pmids\": [\"37141119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HJURP is recruited to DNA double-strand breaks (DSBs) via a mechanism requiring chromatin PARylation; at DSBs, HJURP promotes turnover of H3K9me3 and HP1, facilitating DNA damage signaling and DSB repair; HJURP overexpression globally alters heterochromatin structure and increases radioresistance.\",\n      \"method\": \"Immunofluorescence at DSB sites, PARP inhibition, H3K9me3/HP1 ChIP, HJURP overexpression/knockdown with DNA repair readout\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct localization to DSBs with mechanistic ChIP readout, single lab\",\n      \"pmids\": [\"38279062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HJURP forms disulfide-linked intermediates with PRDX1 through Cys327 and Cys457 residues, promoting PRDX1 redox cycling, inhibiting PRDX1 hyperoxidation, enhancing PRDX1 peroxidase activity, reducing ROS levels, and suppressing ferroptosis in prostate cancer cells.\",\n      \"method\": \"Co-IP, disulfide bond trapping, cysteine mutagenesis, peroxidase activity assay, ROS measurement, ferroptosis assay in vitro and in vivo\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — biochemical disulfide trapping with site-directed mutagenesis and enzymatic activity assay\",\n      \"pmids\": [\"39405980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HJURP (then called clone 546/FAKTS) localizes to the nucleus of mammalian cells and interacts with 14-3-3 proteins in a manner enhanced by activated Akt/PKB; Ser479 is the predominant residue mediating this interaction, and AKT/PKB phosphorylates this site.\",\n      \"method\": \"Yeast two-hybrid, confocal microscopy, co-IP in mammalian cells, site-directed mutagenesis (S479A), Akt expression\",\n      \"journal\": \"Proteins\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — reciprocal co-IP with mutagenesis confirming phosphorylation-dependent interaction, single lab\",\n      \"pmids\": [\"17256767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HJURP directly binds to the C-terminal domain of CENP-C in vitro; this interaction is essential for new CENP-A incorporation; CENP-C and Mis18 complex provide dual recruitment pathways for HJURP at centromeres, and CENP-C, HJURP, and Mis18C form a tight association in the chromatin fraction.\",\n      \"method\": \"In vitro binding assay, Mis18 complex KO cells with HJURP CENP-C-binding mutant, co-IP from chromatin fraction in DT40 cells\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro binding with genetic epistasis in KO cells, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.05.680587\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Under replication stress, ATR promotes CENP-A eviction from centromeres by recruiting VCP (AAA+ ATPase) to destabilize CENP-A nucleosomes; HJURP (but not DAXX or ATRX) is required for nucleolar relocalization of displaced CENP-A.\",\n      \"method\": \"Replication stress induction, ATR inhibition, VCP depletion, HJURP/DAXX/ATRX knockdown, immunofluorescence for CENP-A localization\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic dissection of pathway with specific phenotypic readout, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.20.683416\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"HJURP is a cell-cycle-regulated CENP-A-specific histone chaperone that binds CENP-A/H4 heterodimers through its conserved N-terminal CBD/Scm3-like domain (structurally confirmed by crystal structure), forms homodimers through its C-terminal domain to enable octameric nucleosome assembly, and is recruited to centromeres in early G1 via dual pathways involving the Mis18 complex (Mis18α/β/M18BP1) and CENP-C, where it deposits new CENP-A nucleosomes; CDK-dependent phosphorylation of HJURP restricts this activity to telophase/G1 by preventing premature interaction with CENP-C, while during S phase HJURP also associates with the MCM2-7 helicase to facilitate inheritance of pre-existing CENP-A nucleosomes through DNA replication; additionally, HJURP is recruited to DNA double-strand breaks via PARylation-dependent mechanisms to promote chromatin reorganization and DSB repair, and interacts with PRDX1 via disulfide bonds to enhance its peroxidase activity and suppress ferroptosis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"HJURP is the dedicated histone chaperone for the centromere-specific histone H3 variant CENP-A, essential for both de novo CENP-A deposition in early G1 and inheritance of CENP-A nucleosomes during S-phase DNA replication. Its conserved N-terminal CENP-A binding domain (CBD) recognizes the CATD of CENP-A/H4 heterodimers with high specificity, capping the DNA-binding surface to prevent premature nucleosome formation, while its C-terminal dimerization domain enables assembly of octameric CENP-A nucleosomes [PMID:19410544, PMID:21478274, PMID:23771058]. HJURP is recruited to centromeres through dual pathways involving the Mis18 complex (Mis18α/β and M18BP1) and CENP-C, with CDK-dependent phosphorylation restricting centromeric access to telophase/G1 by blocking the HJURP–CENP-C interaction [PMID:24519934, PMID:37141119, PMID:31492860]; during S phase, HJURP cooperates with the MCM2-7 helicase to recycle parental CENP-A nucleosomes through replication forks [PMID:30293838]. Beyond centromere biology, HJURP is recruited to DNA double-strand breaks via PARylation-dependent mechanisms to promote heterochromatin remodeling and DSB repair, and forms disulfide-linked intermediates with PRDX1 to enhance peroxidase activity and suppress ferroptosis [PMID:38279062, PMID:39405980].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Before its centromeric role was known, the initial characterization established that HJURP is a nuclear protein whose interaction with 14-3-3 proteins is regulated by Akt/PKB-dependent phosphorylation at Ser479, hinting at signaling-responsive regulation.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, site-directed mutagenesis of S479A in mammalian cells\",\n      \"pmids\": [\"17256767\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of 14-3-3 binding for HJURP activity unknown\", \"Relationship to centromere function not yet recognized\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Two simultaneous studies resolved the long-standing question of how new CENP-A is deposited at centromeres after replication, establishing HJURP as the dedicated CENP-A chaperone that forms a prenucleosomal complex with CENP-A/H4 and is required for G1-phase CENP-A loading via recognition of the CATD.\",\n      \"evidence\": \"Co-IP, mass spectrometry, RNAi with CENP-A localization readout, cell-cycle fractionation, live-cell imaging in two independent labs\",\n      \"pmids\": [\"19410544\", \"19410545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CENP-A recognition not yet determined\", \"Mechanism of centromeric recruitment unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"In vitro reconstitution demonstrated that HJURP directly and stoichiometrically binds CENP-A/H4 (but not H3/H4) through a conserved N-terminal CBD containing a TLTY motif, and can deposit CENP-A/H4 onto naked DNA, establishing its intrinsic chaperone activity independent of other centromere factors.\",\n      \"evidence\": \"Bacterially expressed protein binding assays, in vitro chromatin assembly, TLTY box mutagenesis\",\n      \"pmids\": [\"20080577\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of the HJURP–CENP-A–H4 complex not yet available\", \"Epigenetic requirements for centromeric targeting not addressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The discovery that H3K4me2 at centromeric chromatin is required for HJURP recruitment revealed an upstream epigenetic prerequisite for CENP-A deposition, linking histone modification state to chaperone access.\",\n      \"evidence\": \"LSD1 demethylase tethering to human artificial chromosome, ChIP, CENP-A incorporation assay\",\n      \"pmids\": [\"21157429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism by which H3K4me2 promotes HJURP binding unknown\", \"Whether HJURP reads the mark directly or via an intermediary unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The crystal structure of the HJURP–CENP-A–H4 ternary complex resolved how HJURP achieves specificity: it binds a CENP-A/H4 heterodimer (not tetramer), with its C-terminal β-sheet capping the DNA-binding region to prevent premature nucleosome formation, and contacts a CENP-A surface distinct from canonical H3.\",\n      \"evidence\": \"X-ray crystallography with structure–function mutagenesis\",\n      \"pmids\": [\"21478274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the heterodimer-bound state transitions to octameric nucleosome not explained\", \"In vivo validation of specific structural contacts limited\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Ectopic targeting of HJURP to a non-centromeric locus was sufficient to build a functional de novo centromere with full kinetochore assembly and microtubule attachment, proving HJURP is the rate-limiting activity for centromere specification; recruitment required the Mis18 complex, identifying the upstream licensing step.\",\n      \"evidence\": \"LacI/LacO ectopic targeting, in vitro nucleosome assembly, kinetochore-microtubule attachment assay, RNAi epistasis\",\n      \"pmids\": [\"21768289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding interface between HJURP and Mis18 components not mapped\", \"Mechanism by which Mis18 licenses HJURP centromeric access unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Conservation of the HJURP/Scm3 mechanism was established: Xenopus HJURP is functionally interchangeable with human HJURP in egg extracts, and condensin II (but not condensin I) was identified as a required cofactor for CENP-A retention.\",\n      \"evidence\": \"Xenopus egg extract immunodepletion and complementation, condensin I/II selective depletion\",\n      \"pmids\": [\"21321101\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction between HJURP and condensin II not demonstrated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Systematic mutagenesis of CENP-A dissected the HJURP recognition code: surface-exposed CATD residues drive HJURP binding specificity, while buried CATD residues enforce rigidity needed for chromatin incorporation, and an intact CENP-A/CENP-A dimerization interface is required for stable nucleosome assembly after HJURP-mediated deposition.\",\n      \"evidence\": \"Surface and buried residue mutagenesis of CENP-A, in vitro binding and chromatin incorporation assays\",\n      \"pmids\": [\"22406139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How HJURP releases CENP-A during the deposition step not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The discovery that HJURP homodimerizes through its C-terminal domain solved the heterodimer-to-octamer paradox: since each HJURP monomer binds one CENP-A/H4 dimer, dimerization brings two CENP-A/H4 dimers together for nucleosome assembly; dimerization is required for deposition but dispensable for centromere recruitment or CENP-A binding.\",\n      \"evidence\": \"Crystallography of the C-terminal dimerization domain, separation-of-function mutations, CENP-A deposition assay\",\n      \"pmids\": [\"23771058\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetics and directionality of the HJURP dimer-mediated assembly reaction in vivo not characterized\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"CDK-dependent phosphorylation was established as the temporal gating mechanism: phosphorylated HJURP cannot bind Mis18β, restricting centromere recruitment to the post-mitotic window; a non-phosphorylatable HJURP mutant loads CENP-A prematurely in S/G2 phase. HJURP also contains a DNA-binding domain required for CENP-A loading.\",\n      \"evidence\": \"Phosphomimetic and non-phosphorylatable mutants, co-IP mapping of HJURP-Mis18β interaction (residues 437–460), cell-cycle analysis\",\n      \"pmids\": [\"24519934\", \"25001279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CDK1 or CDK2 is the primary kinase in vivo debated\", \"Structural basis of phosphorylation-dependent inhibition of Mis18β binding not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Genetic dissection in DT40 cells mapped a separable HJURP–M18BP1 interaction domain and demonstrated that HJURP possesses a centromere expansion activity independent of its CENP-A binding function, revealing modular domain architecture.\",\n      \"evidence\": \"DT40 knockout with gene replacement, separation-of-function constructs, co-IP\",\n      \"pmids\": [\"26063729\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of the centromere expansion activity unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"HJURP was shown to directly bind condensin II (not condensin I) and recruit the CAPH2 subunit to centromeres in early G1, functionally linking condensin II-mediated chromatin remodeling to CENP-A deposition.\",\n      \"evidence\": \"Selective condensin I/II co-IP, CAPH2 localization, LacO chromatin decondensation assay, epistasis with condensin II depletion\",\n      \"pmids\": [\"27807043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether condensin II remodeling is catalytic or structural at centromeres unknown\", \"Direct binding interface not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A new S-phase role was uncovered: HJURP transiently associates with centromeres during replication and co-purifies with the MCM2-7 helicase, and is required for inheritance of pre-existing CENP-A nucleosomes through the replication fork, establishing a dual-phase function for the chaperone.\",\n      \"evidence\": \"BioID proximity labeling, co-purification with MCM2, RNAi during S phase with CENP-A inheritance readout\",\n      \"pmids\": [\"30293838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HJURP directly binds MCM2 or acts through an intermediary not fully resolved\", \"Stoichiometry and topology of the HJURP-MCM2-CENP-A complex unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Biochemical reconstitution of the full Mis18 complex with HJURP revealed that two HJURP repeats are functionally interchangeable and bind to a 4:2:2 Mis18α:Mis18β:M18BP1 complex; Mis18α N-terminal tails gate HJURP access to binding sites near the Mis18αβ C-terminal helices, defining the molecular licensing mechanism.\",\n      \"evidence\": \"Photo-cross-linking, size exclusion chromatography, site-directed mutagenesis of reconstituted complexes\",\n      \"pmids\": [\"31492860\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Mis18α autoinhibition is relieved in vivo not determined\", \"Whether both HJURP binding sites are occupied simultaneously in cells unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Super-resolution imaging placed HJURP at the physical center of rosette-like CENP-A nucleosome clusters during G1, providing nanoscale spatial evidence that HJURP acts as the nucleation point for centromeric chromatin assembly.\",\n      \"evidence\": \"2D/3D STORM/PALM super-resolution microscopy with quantitative co-localization\",\n      \"pmids\": [\"31570711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamic assembly sequence not captured by fixed-cell imaging\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A dual-lock timing model was established: CDK phosphorylation prevents the HJURP–CENP-C interaction in metaphase, while M18BP1.S competitively blocks HJURP access to CENP-C; removal of both inhibitory pathways causes ectopic CENP-A assembly in metaphase, revealing CENP-C as a direct centromeric receptor for HJURP.\",\n      \"evidence\": \"Cell-free Xenopus egg extract, non-phosphorylatable HJURP mutants, competitive inhibition assay with CENP-A deposition readout\",\n      \"pmids\": [\"37141119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of HJURP–CENP-C interaction not yet resolved\", \"Whether this mechanism is fully conserved in mammals not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"An unexpected non-centromeric function was established: HJURP is recruited to DNA double-strand breaks through PARylation-dependent mechanisms, where it promotes turnover of H3K9me3 and HP1 to facilitate DSB repair and confer radioresistance.\",\n      \"evidence\": \"Immunofluorescence at laser-induced DSBs, PARP inhibition, H3K9me3/HP1 ChIP, HJURP overexpression/knockdown with DNA repair readout\",\n      \"pmids\": [\"38279062\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether HJURP deposits CENP-A at DSBs or acts through a CENP-A-independent mechanism not resolved\", \"PAR-binding domain of HJURP not identified\", \"Single lab finding not yet independently replicated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A redox-regulatory function was discovered: HJURP forms disulfide-linked intermediates with PRDX1 through specific cysteine residues (C327, C457), promoting PRDX1 redox cycling, preventing hyperoxidation, and suppressing ferroptosis in prostate cancer cells.\",\n      \"evidence\": \"Disulfide bond trapping, cysteine mutagenesis, peroxidase activity assay, ROS measurement, ferroptosis assay in vitro and in vivo\",\n      \"pmids\": [\"39405980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological context of HJURP-PRDX1 interaction beyond cancer unclear\", \"Whether this function is connected to centromere biology or entirely independent unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis of the HJURP–CENP-C interaction, the mechanism by which HJURP coordinates with the MCM2-7 helicase during replication-coupled CENP-A recycling, whether the DSB repair and PRDX1 redox functions operate through CENP-A-dependent or -independent mechanisms, and how HJURP release from assembled CENP-A nucleosomes is triggered.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of HJURP–CENP-C complex\", \"MCM2-HJURP-CENP-A ternary complex architecture undetermined\", \"CENP-A dependence of DSB and redox roles not tested\", \"HJURP nucleosome release mechanism unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0, 2, 5, 6, 8, 9]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 2, 5, 8]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0016209\", \"supporting_discovery_ids\": [25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 26]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [1, 4, 19]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 11, 12, 23]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 4, 5, 9, 14]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [\n      \"HJURP-CENP-A/H4 prenucleosomal complex\",\n      \"Mis18α/Mis18β/M18BP1-HJURP licensing complex\"\n    ],\n    \"partners\": [\n      \"CENPA\",\n      \"HJURP\",\n      \"MIS18BP1\",\n      \"MIS18B\",\n      \"CENPC\",\n      \"MCM2\",\n      \"CAPH2\",\n      \"PRDX1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}