{"gene":"RAD17","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2002,"finding":"Human Rad17 recruits the Rad9-Rad1-Hus1 (9-1-1) complex onto chromatin after DNA damage. Rad17 binds chromatin prior to damage and is phosphorylated by ATR on chromatin after damage. The phosphorylation of Rad17 by ATR requires Hus1, suggesting that the 9-1-1 complex recruited by Rad17 enables ATR to recognize its substrates. Rad17 and ATR localize to DNA damage largely independently.","method":"Chromatin fractionation, co-immunoprecipitation, siRNA knockdown, epistasis analysis in human cells","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and chromatin fractionation with multiple orthogonal methods; foundational paper replicated across subsequent studies","pmids":["11799063"],"is_preprint":false},{"year":2003,"finding":"Replication protein A (RPA) stimulates binding of the Rad17-Rfc2-5 complex to single-stranded DNA (ssDNA), primed ssDNA, and gapped DNA structures. RPA facilitates recruitment of the Rad9-Rad1-Hus1 complex by Rad17-Rfc2-5 to primed and gapped DNA in vitro. Unlike RFC, which uses the 3' primer/template junction to load PCNA, Rad17-Rfc2-5 can use both 5' and 3' junctions and prefers gapped DNA structures.","method":"In vitro biochemical reconstitution with purified proteins, DNA binding assays, pulldown assays","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 components, multiple DNA substrate comparisons, foundational mechanism paper","pmids":["14605214"],"is_preprint":false},{"year":2001,"finding":"ATM and ATR phosphorylate human Rad17 at Ser635 and Ser645 in response to genotoxic agents. A phosphorylation-deficient Rad17 mutant (Rad17AA, S635A/S645A) abrogated the DNA-damage-induced G2 checkpoint and sensitized cells to genotoxic stress. The Rad17AA mutant showed no ionizing-radiation-inducible association with hRad1, indicating phosphorylation is required for interaction with the 9-1-1 complex.","method":"In vitro kinase assay (ATR/ATM), phosphorylation-site mutagenesis, co-immunoprecipitation, cell cycle analysis by flow cytometry, overexpression in human fibroblasts","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro kinase assay plus mutagenesis plus functional cell cycle phenotype, replicated by Post et al. 2001","pmids":["11418864"],"is_preprint":false},{"year":2001,"finding":"ATR (but not ATM) phosphorylates human Rad17 at Ser635 and Ser645 in vitro. These sites are phosphorylated in a cell-cycle-regulated manner in undamaged cells (late G1, S, and G2/M, but not early-mid G1). Expression of a Rad17 S635A/S645A double mutant abolished IR-induced G1/S checkpoint activation in MCF-7 cells.","method":"In vitro kinase assay with recombinant ATR, synchronized cell cycle analysis, mutagenesis, G1/S checkpoint assay in MCF-7 cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro kinase assay plus mutagenesis plus functional checkpoint readout; independently consistent with Bao et al. 2001","pmids":["11687627"],"is_preprint":false},{"year":2003,"finding":"Phosphorylated Rad17 interacts with Claspin and regulates its phosphorylation. A phosphomutant Rad17AA fails to sustain Chk1 phosphorylation after hydroxyurea withdrawal and fails to recruit Claspin, defining an ATR–Rad17–Claspin–Chk1 signaling cascade for replication stress responses.","method":"Co-immunoprecipitation of phospho-Rad17 with Claspin, siRNA knockdown, Chk1 phosphorylation assays, cell cycle analysis in human cells","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, phosphomutant epistasis, multiple orthogonal methods in one study, replicated concept across labs","pmids":["16885023"],"is_preprint":false},{"year":2003,"finding":"The yeast Rad24-RFC complex (clamp loader) loads the Rad17-Mec3-Ddc1 (9-1-1) clamp onto partial-duplex DNA in an ATP-dependent process in vitro. Upon ATP hydrolysis, the 9-1-1 clamp is released from the clamp loader and can slide across >1 kb of duplex DNA. The 9-1-1 clamp showed no detectable exonuclease activity.","method":"In vitro reconstitution with purified yeast proteins, ATP hydrolysis assays, DNA mobility shift assays","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 components demonstrating ATP-dependent loading and sliding","pmids":["12604797"],"is_preprint":false},{"year":2002,"finding":"Human Rad17 forms a heteropentameric complex with four small RFC subunits (hRad17-RFC) with a cleft structure similar to RFC. The 9-1-1 complex forms a trimeric ring structure similar to PCNA. Rad17-RFC exhibits DNA binding and ATPase activity and binds Rad9-1-1.","method":"Purification of recombinant complexes from insect cells, electron microscopy (glycerol spray/low-voltage and platinum shadowing), ATPase assay, pulldown","journal":"The Journal of biological chemistry / Genes to cells","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — structural EM of purified complexes from two independent groups, ATPase activity demonstrated biochemically","pmids":["11907025","12167163"],"is_preprint":false},{"year":2022,"finding":"CryoEM structure of human RAD17-RFC clamp loader bound to human 9-1-1 at a dsDNA-ssDNA junction at a recessed 5'-end was determined. The structure reveals how RAD17 confers specificity for 9-1-1 over PCNA and how the clamp loader specifically recognizes the recessed 5' DNA end, fixing the orientation of 9-1-1 on ssDNA.","method":"Cryogenic electron microscopy (cryo-EM) structural determination of human RAD17-RFC:9-1-1:DNA complex","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution cryo-EM structure with functional interpretation; single study but rigorous structural method","pmids":["35819203"],"is_preprint":false},{"year":2004,"finding":"Human MCM7 was identified as a novel Rad17-interacting protein. Depletion of either Rad17 or MCM7 by siRNA suppressed UV- or aphidicolin-induced Chk1 phosphorylation and abolished UV-induced S-phase checkpoint activation. MCM7-depleted cells were defective for ATR nuclear focus formation after UV, suggesting MCM7 is required for stable recruitment of ATR to damaged DNA.","method":"Co-immunoprecipitation, siRNA knockdown, Chk1 phosphorylation assay, immunofluorescence for ATR foci","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and functional siRNA knockdown with defined checkpoint readout, single lab","pmids":["15538388"],"is_preprint":false},{"year":2013,"finding":"Rad17 is required for the rapid phosphorylation of Chk1 but not for a Nbs1-dependent mode of ATR activation that phosphorylates RPA32 Ser33. These represent two distinct modes of ATR activation at replication-associated DSBs.","method":"siRNA knockdown, in vitro ATR kinase assay, phospho-specific antibodies, Xenopus egg extracts","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro assay plus siRNA knockdown with multiple orthogonal substrates and controls in one study","pmids":["23684611"],"is_preprint":false},{"year":2014,"finding":"Rad17 is required for early, MDC1-independent recruitment of the MRN (MRE11-RAD50-NBS1) complex to DSB sites and contributes to ATM activation. ATM phosphorylates Rad17 at a novel Thr622 site, which enables direct interaction of Rad17 with NBS1 and facilitates recruitment of MRN/ATM to DSBs, creating a positive feedback loop. Thr622 phosphorylation is important for MRN/ATM signaling and homologous recombination repair.","method":"Co-immunoprecipitation, phospho-site mapping by mass spectrometry, point mutagenesis (T622A), HR repair assay (gene targeting), chromatin fractionation in human cells","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, mutagenesis with functional HR readout, multiple orthogonal methods in one study","pmids":["24534091"],"is_preprint":false},{"year":2010,"finding":"Rad17 mediates the interaction of the 9-1-1 complex with the ATR-activating protein TopBP1 in Xenopus egg extracts. ATP binding by Rad17 is essential for 9-1-1 and TopBP1 association. ATP hydrolysis by Rad17 is necessary for loading 9-1-1 onto DNA and the checkpoint-dependent accumulation of TopBP1 on chromatin. A 9-1-1 mutant unable to bind TopBP1 still supports normal TopBP1 chromatin accumulation, suggesting TopBP1 accumulation is Rad17- and 9-1-1-dependent but not through direct 9-1-1-TopBP1 docking.","method":"Xenopus egg extract checkpoint assays, Rad17 ATPase mutant analysis, TopBP1 chromatin binding assays, co-immunoprecipitation","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — reconstituted in Xenopus extracts, ATPase mutagenesis, multiple orthogonal functional assays in one study","pmids":["20110345"],"is_preprint":false},{"year":2010,"finding":"Rad17 is ubiquitinated and degraded by the Cdh1/APC ubiquitin ligase after UV radiation in human cells. A degradation-resistant Rad17 mutant prevents termination of checkpoint signaling and blocks re-entry into the cell cycle, demonstrating that Rad17 proteolysis by Cdh1/APC is required for checkpoint termination and recovery from genotoxic stress.","method":"Ubiquitination assays, Cdh1/APC co-immunoprecipitation, degradation-resistant mutant overexpression, cell cycle re-entry assays, siRNA knockdown in human primary cells","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional ubiquitination assay, Co-IP of E3 ligase-substrate, degradation-resistant mutant with defined phenotypic readout","pmids":["20424596"],"is_preprint":false},{"year":1999,"finding":"In S. cerevisiae, Rad17 and Mec3 interact physically in vivo (yeast two-hybrid and co-immunoprecipitation). Ddc1 co-sediments and co-immunoprecipitates with both Rad17 and Mec3, forming a trimeric complex. Rad24 does not associate with Rad17, Mec3, or Ddc1. DDC1 overexpression partially suppresses rad24 deletion phenotypes, placing the Rad17-Mec3-Ddc1 complex downstream of Rad24.","method":"Yeast two-hybrid screen, co-immunoprecipitation, gel filtration co-sedimentation, genetic epistasis (dosage suppression)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Y2H + Co-IP + co-sedimentation + epistasis) in one study","pmids":["9891048"],"is_preprint":false},{"year":2000,"finding":"S. cerevisiae Rad24 forms an RFC-like complex with the four small RFC subunits Rfc2, Rfc3, Rfc4, and Rfc5 (but not Rfc1), identified by purification and mass spectrometry. Reciprocal co-immunoprecipitation confirmed these interactions.","method":"Biochemical purification to homogeneity, mass spectrometry, reciprocal co-immunoprecipitation","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — purification to homogeneity, mass spectrometry identification, reciprocal Co-IP, replicated across multiple subsequent studies","pmids":["10660302"],"is_preprint":false},{"year":1998,"finding":"S. cerevisiae Rad24 physically interacts with RFC subunits Rfc2 and Rfc5 and co-sediments with Rfc5. The conserved NTP-binding motif (Lys115) of Rad24 is required for its interaction with RFC proteins and for checkpoint function. RAD24 overexpression suppresses the checkpoint defect of rfc5-1 mutants.","method":"Co-immunoprecipitation, co-sedimentation, site-directed mutagenesis (K115E, K115R), dosage suppression, Rad53 phosphorylation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, mutagenesis of NTP-binding motif, functional rescue; independently replicated by Green et al. 2000","pmids":["9710632","10913172"],"is_preprint":false},{"year":2003,"finding":"Human Rad17 is chromatin-associated throughout the cell cycle independently of DNA damage. Phosphorylated Rad17 preferentially associates with sites of ongoing DNA replication and interacts with DNA polymerase epsilon (co-immunoprecipitation).","method":"Chromatin fractionation, co-immunoprecipitation with DNA polymerase epsilon, BrdU incorporation to mark replication sites, immunofluorescence","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP of endogenous interaction plus chromatin fractionation, single lab","pmids":["14500819"],"is_preprint":false},{"year":2003,"finding":"RAD17 deletion in human somatic cells leads to acute chromosomal aberrations and endoreduplication at high rates, demonstrating that Rad17 is essential for cell viability and chromosomal stability, linking checkpoint function to ploidy control.","method":"Conditional RAD17 knockout in human somatic cells, flow cytometry for ploidy, cytogenetic analysis for chromosomal aberrations","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional somatic KO with defined chromosomal and cell viability phenotype, clean genetic approach","pmids":["12672690"],"is_preprint":false},{"year":2014,"finding":"The deubiquitylase USP20 interacts with Rad17, stabilizes Rad17 protein in steady-state and after DNA damage in a proteasome-dependent manner, and is required for proper Chk1 phosphorylation by ATR. USP20 depletion impairs homologous recombination repair of collapsed replication forks.","method":"Co-immunoprecipitation, siRNA knockdown, ubiquitination assays, Chk1 phosphorylation assay, HR repair assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP of USP20-Rad17 interaction, siRNA functional phenotype, single lab","pmids":["24923443"],"is_preprint":false},{"year":2001,"finding":"Fission yeast Rad17 associates with chromatin in response to DNA damage (MMS or ionizing radiation) but dissociates from chromatin during S-phase stall (hydroxyurea). Rad17 complexes in vivo with the Rfc small subunit Rfc2 but not Rfc1. A checkpoint-defective mutant Rad17(K118E) cannot bind ATP, shows reduced chromatin binding, and reduced complex formation with Rfc2, indicating ATP binding is required for chromatin association and RFC complex formation.","method":"Chromatin fractionation, co-immunoprecipitation, site-directed mutagenesis (K118E), ATP binding assays in S. pombe","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — chromatin fractionation plus Co-IP plus mutagenesis with multiple experimental conditions, consistent with mammalian studies","pmids":["11313455"],"is_preprint":false},{"year":2004,"finding":"Mouse Rad17 deletion leads to embryonic lethality during early/mid-gestation. Truncated mRad17-expressing ES cells are hypersensitive to DNA-damaging agents and display impaired homologous recombination (strongly reduced gene targeting efficiency), demonstrating a role for Rad17 in DNA damage-dependent recombination beyond checkpoint signaling.","method":"Targeted gene deletion in mice and ES cells, clonogenic survival assays with DNA-damaging agents, gene targeting efficiency assay for HR, cell cycle checkpoint assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean conditional KO in ES cells with defined recombination phenotype; embryonic lethality confirms essential role","pmids":["15297881"],"is_preprint":false},{"year":2004,"finding":"HIV-1 Vpr-mediated G2 arrest requires Rad17 and Hus1. Vpr activates ATR signaling, and knockdown/mutation of Rad17 or Hus1 prevents Vpr-induced G2 arrest, phosphorylation of histone H2AX, and formation of γH2AX/BRCA1 nuclear foci.","method":"siRNA knockdown of Rad17 and Hus1, flow cytometry for G2 arrest, immunofluorescence for γH2AX and BRCA1 foci in human cells","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA functional knockdown with multiple readouts, single lab, mechanistic placement in ATR pathway","pmids":["15485898"],"is_preprint":false},{"year":2008,"finding":"ATR and Rad17 collaborate to regulate Rad9 localization at DNA damage sites. DNA damage or replication stress causes Rad17-dependent immobilization of Rad9 into nuclear foci. Expression of phosphorylation-deficient Rad17(AA) or ATR downregulation reduces the number of cells with Rad9 foci and increases the dynamic behavior of Rad9 within foci (measured by FRAP).","method":"Immunofluorescence, FRAP (fluorescence recovery after photobleaching), siRNA knockdown of ATR, overexpression of Rad17(AA) mutant in human cells","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRAP provides direct measurement of protein dynamics at damage sites plus mutagenesis, single lab","pmids":["19020305"],"is_preprint":false},{"year":2004,"finding":"ATPase activity of Rad17 is required for its chromatin association and for ATR-mediated S-phase checkpoint activation in response to low-dose UV radiation in human cells.","method":"ATPase-deficient Rad17 mutant expression, chromatin fractionation, S-phase checkpoint assay (DNA synthesis inhibition) in human cells","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis of ATPase activity with functional checkpoint readout, single lab","pmids":["15235112"],"is_preprint":false},{"year":2016,"finding":"A conserved KYxxL motif in the AAA+ domain of Rad17 is essential for interaction with the 9-1-1 complex. Rad17 KYxxL mutants show increased UV-induced Rad17 phosphorylation, suggesting the 9-1-1 complex negatively regulates Rad17 phosphorylation. Nucleotide-binding activity of Rad17 is required for its nuclear localization.","method":"Site-directed mutagenesis of KYxxL motif, co-immunoprecipitation, phosphorylation assays by western blot, nuclear localization analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — mutagenesis plus Co-IP plus localization, single lab","pmids":["27387238"],"is_preprint":false},{"year":2017,"finding":"The polyanionic C-terminal tail of human Rad17 contains a conserved sequence motif (iVERGE) that is required for interaction with the 9-1-1 complex and regulation of ATR-Chk1 signaling.","method":"Deletion mutagenesis of C-terminal tail, co-immunoprecipitation with 9-1-1, Chk1 phosphorylation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — mutagenesis plus Co-IP, single lab, mechanistic placement","pmids":["28666868"],"is_preprint":false},{"year":2018,"finding":"Casein kinase 2 (CK2) constitutively phosphorylates Rad17 at Ser667 within the C-terminal iVERGE motif, and this phosphorylation is required for interaction between Rad17 and the 9-1-1 complex. CK2 inhibition by CX-4945/Silmitasertib impairs Rad17-9-1-1 interaction in a Ser667-dependent manner.","method":"Site-directed mutagenesis (S667A), CK2 inhibitor treatment, co-immunoprecipitation, in vitro CK2 kinase assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — in vitro kinase assay plus mutagenesis plus Co-IP, single lab","pmids":["29902452"],"is_preprint":false},{"year":2019,"finding":"CK1δ/ε phosphorylates Rad17 at Thr670. T670 phosphorylation promotes Ser667 phosphorylation (and vice versa), and phosphomimetic T670 mutations enhance interaction with the 9-1-1 complex, indicating multi-site phosphorylation at the C-terminal iVERGE motif regulates ATR-Chk1 signaling.","method":"In vitro CK1δ/ε kinase assay, phosphomimetic mutagenesis, co-immunoprecipitation with 9-1-1","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — in vitro kinase assay plus mutagenesis plus Co-IP, single lab, extends prior CK2 finding","pmids":["31353086"],"is_preprint":false},{"year":2023,"finding":"Crystal structure (2.1 Å) of human 9-1-1 bound to a RAD17 N-terminal peptide containing a RAD1-binding motif was determined. The N-terminal region of RAD17 binds specifically to the RAD1 subunit of 9-1-1 via defined interactions. The RAD1-binding motif of RHINO competes with the RAD17 N-terminal region for RAD1 binding, implying functional roles in 9-1-1 loading/unloading.","method":"X-ray crystallography (2.1 Å), peptide binding assays, competition assays with RHINO peptide","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure with competition validation, single study","pmids":["36841485"],"is_preprint":false},{"year":2002,"finding":"Upon replication block (hydroxyurea) in late S phase, co-immunoprecipitation showed interaction of RFC p37 subunit with Rad17, and PCNA with Rad9 and RFC p37. Enhanced colocalization of Rad17 and PCNA was observed in late S phase after hydroxyurea treatment, suggesting Rad17/RFC is recruited to DNA lesions and enables 9-1-1 to interact with PCNA.","method":"Co-immunoprecipitation from hydroxyurea-treated HeLa cells, immunofluorescence colocalization","journal":"Oncogene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP and colocalization, single lab, no mutagenesis validation","pmids":["12400013"],"is_preprint":false},{"year":2014,"finding":"In chicken DT40 cells, Rad17 deletion dramatically reduces gene targeting (homologous recombination) efficiency and reduces sister chromatid exchange frequency even in BLM-deficient cells, indicating Rad17 plays a direct role in homologous recombination beyond replication checkpoint signaling.","method":"Gene targeting (HR efficiency assay) in Rad17-/- and blm/rad17 DT40 cells, sister chromatid exchange assay, growth curve analysis","journal":"Genes & genetic systems","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean gene KO with quantitative HR and SCE assays, consistent with mouse ES cell data from Budzowska et al.","pmids":["19168994"],"is_preprint":false},{"year":2016,"finding":"Pol κ depletion in glioblastoma cells facilitates temozolomide-induced Rad17 ubiquitination and proteasomal degradation, thereby silencing ATR-Chk1 signaling. Overexpression of Rad17 in Pol κ-depleted cells restored HR efficiency and desensitized cells to temozolomide, placing Rad17 downstream of Pol κ in protection of stalled replication forks.","method":"Ubiquitination assays, western blotting for Rad17 protein levels, HR repair assay, Rad17 overexpression rescue, siRNA knockdown","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — ubiquitination assay plus functional rescue by Rad17 overexpression, single lab","pmids":["26960975"],"is_preprint":false},{"year":2014,"finding":"The Ddc1-Mec3-Rad17 (9-1-1) complex in yeast regulates DNA replication-coupled nucleosome assembly. Rad17 deletion reduces deposition of newly synthesized H3-H4 onto replicated DNA, increases association of histone chaperone Asf1 with Rad53 (reducing Asf1-H3 interaction), and increases H3-H4 interactions with CAF-1 and Rtt106.","method":"Genetic epistasis, chromatin immunoprecipitation of newly synthesized histones (SNAP-ChIP), co-immunoprecipitation of Asf1-Rad53 and histone-chaperone interactions in yeast","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — multiple Co-IP interactions plus chromatin-bound histone deposition assay, single lab","pmids":["24573675"],"is_preprint":false},{"year":2014,"finding":"v-Src suppresses ATR-Chk1 signaling by inhibiting the interaction between Rad17 and Rad9 in the chromatin fraction, without affecting RPA32 phosphorylation, ATR autophosphorylation, or TopBP1-Rad9 interaction, and induces replication fork collapse.","method":"Co-immunoprecipitation from chromatin fraction, Chk1 phosphorylation assay, replication fork collapse assay, v-Src overexpression","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP in chromatin fraction, single lab, limited mechanistic follow-up","pmids":["24971543"],"is_preprint":false}],"current_model":"RAD17 (human) encodes the large subunit of an RFC-like clamp loader complex (RAD17-RFC2-5) that recognizes RPA-coated ssDNA at DNA damage sites and replication forks, loads the PCNA-like 9-1-1 (RAD9-RAD1-HUS1) checkpoint clamp onto 5'-recessed dsDNA-ssDNA junctions in an ATP-dependent manner, and thereby activates the ATR-TopBP1-Claspin-Chk1 checkpoint signaling cascade; ATR phosphorylates RAD17 at Ser635/Ser645, which is required for sustained Chk1 activation and Claspin recruitment, while casein kinases CK2 and CK1δ/ε constitutively phosphorylate the C-terminal iVERGE motif at Ser667/Thr670 to promote RAD17-9-1-1 interaction; RAD17 also recruits the MRN complex to DSBs through ATM-dependent phosphorylation at Thr622 and interacts with MCM7 and DNA polymerase epsilon at replication forks; following checkpoint activation, Cdh1/APC ubiquitinates RAD17 for proteasomal degradation to allow checkpoint termination and cell cycle re-entry; RAD17 is essential for genomic stability, homologous recombination repair, and embryonic viability in mammals."},"narrative":{"mechanistic_narrative":"RAD17 is the large subunit of an RFC-like (clamp loader) complex that initiates the ATR-dependent DNA damage and replication checkpoint by loading the PCNA-like 9-1-1 (RAD9-RAD1-HUS1) clamp onto damaged DNA [PMID:11799063, PMID:11907025, PMID:12167163]. RAD17 assembles with the four small RFC subunits RFC2-RFC5 into a heteropentameric, ATPase-active complex structurally analogous to RFC, and this assembly and RAD17 chromatin association require its conserved nucleotide-binding motif [PMID:11907025, PMID:12167163, PMID:10660302, PMID:11313455]. RPA-coated single-stranded DNA stimulates RAD17-RFC binding to primed and gapped substrates, and unlike replicative RFC the RAD17 complex recognizes recessed 5' dsDNA-ssDNA junctions to load and correctly orient 9-1-1 in an ATP-hydrolysis-dependent manner [PMID:14605214, PMID:12604797, PMID:35819203]. Engagement of 9-1-1 is mediated through a RAD1-binding motif in the RAD17 N-terminus, a conserved KYxxL motif in its AAA+ domain, and a polyanionic C-terminal iVERGE element whose phosphorylation by CK2 (Ser667) and CK1δ/ε (Thr670) promotes the RAD17-9-1-1 interaction [PMID:27387238, PMID:28666868, PMID:29902452, PMID:31353086, PMID:36841485]. Once loaded, RAD17 and 9-1-1 enable ATR to phosphorylate RAD17 at Ser635/Ser645, a modification required for the G1/S and G2 checkpoints, for recruitment of Claspin, and for sustained Chk1 activation, and RAD17 mediates 9-1-1 association with the ATR activator TopBP1 [PMID:11418864, PMID:11687627, PMID:16885023, PMID:20110345]. Beyond ATR signaling, RAD17 supports an ATM branch: ATM phosphorylates RAD17 at Thr622 to drive early MRN complex recruitment to double-strand breaks and homologous recombination repair, and RAD17 is essential for genomic stability, HR, chromosomal integrity, and embryonic viability [PMID:24534091, PMID:12672690, PMID:15297881, PMID:19168994]. Checkpoint signaling is reversed when Cdh1/APC ubiquitinates RAD17 for proteasomal degradation, permitting checkpoint termination and cell cycle re-entry, while the deubiquitylase USP20 opposes this turnover to stabilize RAD17 [PMID:20424596, PMID:24923443].","teleology":[{"year":1999,"claim":"Established that the checkpoint Rad17/Mec3/Ddc1 proteins form a stable trimeric clamp acting downstream of the separate Rad24 clamp-loader, defining a two-module architecture for checkpoint sensing.","evidence":"Yeast two-hybrid, Co-IP, gel filtration co-sedimentation and dosage suppression in S. cerevisiae","pmids":["9891048"],"confidence":"High","gaps":["Did not define the biochemical loading mechanism","Human orthology not yet established"]},{"year":2000,"claim":"Showed the checkpoint clamp loader is an RFC variant in which Rad24 (RAD17 ortholog) replaces Rfc1 while retaining the four small RFC subunits, distinguishing it from replicative RFC.","evidence":"Purification to homogeneity, mass spectrometry and reciprocal Co-IP in S. cerevisiae; ATP-binding motif mutagenesis (K115E/K115R) and dosage suppression of rfc5-1","pmids":["10660302","9710632","10913172"],"confidence":"High","gaps":["Did not show direct clamp loading onto DNA","Human complex composition not confirmed"]},{"year":2001,"claim":"Identified RAD17 as a direct ATR/ATM substrate at Ser635/Ser645 whose phosphorylation is required for DNA-damage checkpoints and for damage-inducible association with 9-1-1, linking RAD17 modification to checkpoint output.","evidence":"In vitro ATR/ATM kinase assays, S635A/S645A mutagenesis, Co-IP and G1/S and G2 checkpoint assays in human cells; ATP-binding/chromatin coupling in S. pombe (K118E)","pmids":["11418864","11687627","11313455"],"confidence":"High","gaps":["Did not resolve how phosphorylation alters 9-1-1 engagement structurally","Order of loading versus phosphorylation unclear"]},{"year":2002,"claim":"Demonstrated that RAD17 recruits 9-1-1 onto chromatin after damage and that RAD17-loaded 9-1-1 is required for ATR to recognize its substrates, placing RAD17 upstream as a damage sensor.","evidence":"Chromatin fractionation, Co-IP, siRNA and epistasis in human cells","pmids":["11799063"],"confidence":"High","gaps":["Mechanism of ATR substrate licensing by 9-1-1 not defined","DNA structure recognized not yet identified"]},{"year":2003,"claim":"Reconstituted the core reaction, showing RPA stimulates RAD17-RFC binding to ssDNA/gapped substrates and that the complex loads 9-1-1 onto partial duplexes via ATP, using 5' junctions unlike replicative RFC.","evidence":"In vitro reconstitution with purified human and yeast proteins, DNA-binding and ATP-hydrolysis/sliding assays","pmids":["14605214","12604797"],"confidence":"High","gaps":["Atomic geometry of junction recognition not yet resolved","In vivo substrate at forks not directly visualized"]},{"year":2003,"claim":"Linked RAD17 to active replication, showing constitutive chromatin association and phosphorylation-dependent localization to replication sites and interaction with DNA polymerase epsilon, and that RAD17 loss causes endoreduplication and chromosomal instability.","evidence":"Chromatin fractionation, Co-IP with Pol epsilon, BrdU labeling; conditional human somatic knockout with cytogenetics and ploidy analysis","pmids":["14500819","12672690"],"confidence":"High","gaps":["Direct functional role of Pol epsilon interaction not defined","Mechanism linking checkpoint loss to endoreduplication unresolved"]},{"year":2004,"claim":"Established RAD17 ATPase activity as required for chromatin loading and S-phase checkpoint, identified MCM7 as a partner needed for ATR focus formation, and demonstrated RAD17 is essential for embryonic viability and homologous recombination.","evidence":"ATPase-mutant analysis and S-phase checkpoint assays; MCM7 Co-IP and siRNA; targeted mouse/ES cell knockout with HR (gene targeting) and survival assays","pmids":["15235112","15538388","15297881"],"confidence":"High","gaps":["How MCM7 stabilizes ATR not mechanistically defined","Whether HR role is separable from checkpoint signaling unresolved here"]},{"year":2008,"claim":"Showed RAD17 and ATR jointly immobilize RAD9 into stable damage foci, providing direct dynamic evidence that RAD17 retains the 9-1-1 clamp at lesions.","evidence":"FRAP, immunofluorescence, ATR siRNA and RAD17(AA) mutant in human cells","pmids":["19020305"],"confidence":"Medium","gaps":["Single lab","Does not define molecular tether retaining 9-1-1"]},{"year":2010,"claim":"Defined RAD17 ATP binding/hydrolysis as the switch coupling 9-1-1 loading to TopBP1 chromatin accumulation, and established Cdh1/APC-mediated RAD17 degradation as the mechanism terminating the checkpoint to allow cell cycle re-entry.","evidence":"Xenopus extract ATPase-mutant assays and TopBP1 chromatin binding; ubiquitination assays, Cdh1/APC Co-IP and degradation-resistant mutant in human cells","pmids":["20110345","20424596"],"confidence":"High","gaps":["Indirect link between 9-1-1 and TopBP1 not fully resolved","Signal triggering Cdh1/APC targeting of RAD17 unknown"]},{"year":2014,"claim":"Revealed an ATM-branch role for RAD17, with ATM phosphorylation at Thr622 driving MRN recruitment to DSBs and HR, and showed RAD17 supports HR independent of replication checkpoint signaling.","evidence":"Phospho-mapping (MS), T622A mutagenesis, NBS1 Co-IP and HR assays in human cells; gene targeting and sister chromatid exchange in DT40 cells; USP20 stabilization of RAD17","pmids":["24534091","19168994","24923443"],"confidence":"High","gaps":["How a clamp loader directly promotes HR strand exchange unresolved","Crosstalk between ATM and ATR RAD17 phospho-sites not integrated"]},{"year":2013,"claim":"Distinguished RAD17-dependent rapid Chk1 phosphorylation from an Nbs1-dependent ATR mode acting on RPA32, showing RAD17 governs a specific branch of ATR activation at replication-associated breaks.","evidence":"siRNA, in vitro ATR kinase assays and phospho-specific antibodies in Xenopus extracts","pmids":["23684611"],"confidence":"High","gaps":["Branch selection determinants not defined","Relative contribution in vivo unquantified"]},{"year":2019,"claim":"Mapped the molecular determinants of RAD17-9-1-1 contact, defining KYxxL, the C-terminal iVERGE motif, and its constitutive phosphorylation by CK2 (Ser667) and CK1δ/ε (Thr670) as regulators of clamp engagement and ATR-Chk1 signaling.","evidence":"Motif/deletion and phosphomimetic mutagenesis, in vitro CK2 and CK1δ/ε kinase assays, CK2 inhibitor (CX-4945), Co-IP in human cells","pmids":["27387238","28666868","29902452","31353086"],"confidence":"Medium","gaps":["Single lab series","In vivo checkpoint requirement of each site not fully tested"]},{"year":2023,"claim":"Provided atomic-resolution mechanism for clamp specificity and orientation, showing how RAD17-RFC recognizes recessed 5' DNA ends and how the RAD17 N-terminus docks onto the RAD1 subunit in competition with RHINO.","evidence":"Cryo-EM of human RAD17-RFC:9-1-1:DNA and 2.1 Å crystal structure of 9-1-1 bound to a RAD17 N-terminal peptide with RHINO competition assays","pmids":["35819203","36841485"],"confidence":"High","gaps":["Functional consequence of RHINO competition in cells not established","Dynamics of loading/unloading cycle not captured"]},{"year":null,"claim":"How RAD17 mechanistically promotes homologous recombination beyond loading the 9-1-1 checkpoint clamp, and how the ATM-Thr622 and ATR-Ser635/645 phospho-branches are coordinated, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No reconstitution of a direct RAD17 role in strand exchange","Integration of ATM and ATR RAD17 modifications uncharacterized","Physiological role of Pol epsilon and MCM7 interactions at unperturbed forks unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[5,6,11,19,23]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,6,7]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[6,11,23]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,10,11]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[22,24]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[0,16,19]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,2,4,9]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[10,20,30]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2,3,12,17]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[1,16]}],"complexes":["RAD17-RFC (RAD17-RFC2-5) clamp loader","9-1-1 (RAD9-RAD1-HUS1) clamp (loaded substrate)"],"partners":["RAD9","RAD1","HUS1","ATR","TOPBP1","CLASPIN","NBS1","MCM7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O75943","full_name":"Cell cycle checkpoint protein RAD17","aliases":["RF-C/activator 1 homolog"],"length_aa":681,"mass_kda":77.1,"function":"Essential for sustained cell growth, maintenance of chromosomal stability, and ATR-dependent checkpoint activation upon DNA damage (PubMed:10208430, PubMed:11418864, PubMed:11687627, PubMed:11799063, PubMed:12672690, PubMed:14624239, PubMed:15235112). Has a weak ATPase activity required for binding to chromatin (PubMed:10208430, PubMed:11418864, PubMed:11687627, PubMed:11799063, PubMed:12672690, PubMed:14624239, PubMed:15235112). Participates in the recruitment of the 9-1-1 (RAD1-RAD9-HUS1) complex and RHNO1 onto chromatin, and in CHEK1 activation (PubMed:21659603). Involved in homologous recombination by mediating recruitment of the MRN complex to DNA damage sites (PubMed:24534091). 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RAD9B","url":"https://www.omim.org/entry/608368"},{"mim_id":"607585","title":"ATM SERINE/THREONINE KINASE; ATM","url":"https://www.omim.org/entry/607585"},{"mim_id":"606605","title":"ATR-INTERACTING PROTEIN; ATRIP","url":"https://www.omim.org/entry/606605"},{"mim_id":"605434","title":"CLASPIN; CLSPN","url":"https://www.omim.org/entry/605434"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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Rad17 binds chromatin prior to damage and is phosphorylated by ATR on chromatin after damage. The phosphorylation of Rad17 by ATR requires Hus1, suggesting that the 9-1-1 complex recruited by Rad17 enables ATR to recognize its substrates. Rad17 and ATR localize to DNA damage largely independently.\",\n      \"method\": \"Chromatin fractionation, co-immunoprecipitation, siRNA knockdown, epistasis analysis in human cells\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and chromatin fractionation with multiple orthogonal methods; foundational paper replicated across subsequent studies\",\n      \"pmids\": [\"11799063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Replication protein A (RPA) stimulates binding of the Rad17-Rfc2-5 complex to single-stranded DNA (ssDNA), primed ssDNA, and gapped DNA structures. RPA facilitates recruitment of the Rad9-Rad1-Hus1 complex by Rad17-Rfc2-5 to primed and gapped DNA in vitro. Unlike RFC, which uses the 3' primer/template junction to load PCNA, Rad17-Rfc2-5 can use both 5' and 3' junctions and prefers gapped DNA structures.\",\n      \"method\": \"In vitro biochemical reconstitution with purified proteins, DNA binding assays, pulldown assays\",\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 components, multiple DNA substrate comparisons, foundational mechanism paper\",\n      \"pmids\": [\"14605214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ATM and ATR phosphorylate human Rad17 at Ser635 and Ser645 in response to genotoxic agents. A phosphorylation-deficient Rad17 mutant (Rad17AA, S635A/S645A) abrogated the DNA-damage-induced G2 checkpoint and sensitized cells to genotoxic stress. The Rad17AA mutant showed no ionizing-radiation-inducible association with hRad1, indicating phosphorylation is required for interaction with the 9-1-1 complex.\",\n      \"method\": \"In vitro kinase assay (ATR/ATM), phosphorylation-site mutagenesis, co-immunoprecipitation, cell cycle analysis by flow cytometry, overexpression in human fibroblasts\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro kinase assay plus mutagenesis plus functional cell cycle phenotype, replicated by Post et al. 2001\",\n      \"pmids\": [\"11418864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ATR (but not ATM) phosphorylates human Rad17 at Ser635 and Ser645 in vitro. These sites are phosphorylated in a cell-cycle-regulated manner in undamaged cells (late G1, S, and G2/M, but not early-mid G1). Expression of a Rad17 S635A/S645A double mutant abolished IR-induced G1/S checkpoint activation in MCF-7 cells.\",\n      \"method\": \"In vitro kinase assay with recombinant ATR, synchronized cell cycle analysis, mutagenesis, G1/S checkpoint assay in MCF-7 cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro kinase assay plus mutagenesis plus functional checkpoint readout; independently consistent with Bao et al. 2001\",\n      \"pmids\": [\"11687627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Phosphorylated Rad17 interacts with Claspin and regulates its phosphorylation. A phosphomutant Rad17AA fails to sustain Chk1 phosphorylation after hydroxyurea withdrawal and fails to recruit Claspin, defining an ATR–Rad17–Claspin–Chk1 signaling cascade for replication stress responses.\",\n      \"method\": \"Co-immunoprecipitation of phospho-Rad17 with Claspin, siRNA knockdown, Chk1 phosphorylation assays, cell cycle analysis in human cells\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, phosphomutant epistasis, multiple orthogonal methods in one study, replicated concept across labs\",\n      \"pmids\": [\"16885023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The yeast Rad24-RFC complex (clamp loader) loads the Rad17-Mec3-Ddc1 (9-1-1) clamp onto partial-duplex DNA in an ATP-dependent process in vitro. Upon ATP hydrolysis, the 9-1-1 clamp is released from the clamp loader and can slide across >1 kb of duplex DNA. The 9-1-1 clamp showed no detectable exonuclease activity.\",\n      \"method\": \"In vitro reconstitution with purified yeast proteins, ATP hydrolysis assays, DNA mobility shift assays\",\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 components demonstrating ATP-dependent loading and sliding\",\n      \"pmids\": [\"12604797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Human Rad17 forms a heteropentameric complex with four small RFC subunits (hRad17-RFC) with a cleft structure similar to RFC. The 9-1-1 complex forms a trimeric ring structure similar to PCNA. Rad17-RFC exhibits DNA binding and ATPase activity and binds Rad9-1-1.\",\n      \"method\": \"Purification of recombinant complexes from insect cells, electron microscopy (glycerol spray/low-voltage and platinum shadowing), ATPase assay, pulldown\",\n      \"journal\": \"The Journal of biological chemistry / Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — structural EM of purified complexes from two independent groups, ATPase activity demonstrated biochemically\",\n      \"pmids\": [\"11907025\", \"12167163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CryoEM structure of human RAD17-RFC clamp loader bound to human 9-1-1 at a dsDNA-ssDNA junction at a recessed 5'-end was determined. The structure reveals how RAD17 confers specificity for 9-1-1 over PCNA and how the clamp loader specifically recognizes the recessed 5' DNA end, fixing the orientation of 9-1-1 on ssDNA.\",\n      \"method\": \"Cryogenic electron microscopy (cryo-EM) structural determination of human RAD17-RFC:9-1-1:DNA complex\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution cryo-EM structure with functional interpretation; single study but rigorous structural method\",\n      \"pmids\": [\"35819203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Human MCM7 was identified as a novel Rad17-interacting protein. Depletion of either Rad17 or MCM7 by siRNA suppressed UV- or aphidicolin-induced Chk1 phosphorylation and abolished UV-induced S-phase checkpoint activation. MCM7-depleted cells were defective for ATR nuclear focus formation after UV, suggesting MCM7 is required for stable recruitment of ATR to damaged DNA.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, Chk1 phosphorylation assay, immunofluorescence for ATR foci\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and functional siRNA knockdown with defined checkpoint readout, single lab\",\n      \"pmids\": [\"15538388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rad17 is required for the rapid phosphorylation of Chk1 but not for a Nbs1-dependent mode of ATR activation that phosphorylates RPA32 Ser33. These represent two distinct modes of ATR activation at replication-associated DSBs.\",\n      \"method\": \"siRNA knockdown, in vitro ATR kinase assay, phospho-specific antibodies, Xenopus egg extracts\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro assay plus siRNA knockdown with multiple orthogonal substrates and controls in one study\",\n      \"pmids\": [\"23684611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rad17 is required for early, MDC1-independent recruitment of the MRN (MRE11-RAD50-NBS1) complex to DSB sites and contributes to ATM activation. ATM phosphorylates Rad17 at a novel Thr622 site, which enables direct interaction of Rad17 with NBS1 and facilitates recruitment of MRN/ATM to DSBs, creating a positive feedback loop. Thr622 phosphorylation is important for MRN/ATM signaling and homologous recombination repair.\",\n      \"method\": \"Co-immunoprecipitation, phospho-site mapping by mass spectrometry, point mutagenesis (T622A), HR repair assay (gene targeting), chromatin fractionation in human cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, mutagenesis with functional HR readout, multiple orthogonal methods in one study\",\n      \"pmids\": [\"24534091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rad17 mediates the interaction of the 9-1-1 complex with the ATR-activating protein TopBP1 in Xenopus egg extracts. ATP binding by Rad17 is essential for 9-1-1 and TopBP1 association. ATP hydrolysis by Rad17 is necessary for loading 9-1-1 onto DNA and the checkpoint-dependent accumulation of TopBP1 on chromatin. A 9-1-1 mutant unable to bind TopBP1 still supports normal TopBP1 chromatin accumulation, suggesting TopBP1 accumulation is Rad17- and 9-1-1-dependent but not through direct 9-1-1-TopBP1 docking.\",\n      \"method\": \"Xenopus egg extract checkpoint assays, Rad17 ATPase mutant analysis, TopBP1 chromatin binding assays, co-immunoprecipitation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — reconstituted in Xenopus extracts, ATPase mutagenesis, multiple orthogonal functional assays in one study\",\n      \"pmids\": [\"20110345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rad17 is ubiquitinated and degraded by the Cdh1/APC ubiquitin ligase after UV radiation in human cells. A degradation-resistant Rad17 mutant prevents termination of checkpoint signaling and blocks re-entry into the cell cycle, demonstrating that Rad17 proteolysis by Cdh1/APC is required for checkpoint termination and recovery from genotoxic stress.\",\n      \"method\": \"Ubiquitination assays, Cdh1/APC co-immunoprecipitation, degradation-resistant mutant overexpression, cell cycle re-entry assays, siRNA knockdown in human primary cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional ubiquitination assay, Co-IP of E3 ligase-substrate, degradation-resistant mutant with defined phenotypic readout\",\n      \"pmids\": [\"20424596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In S. cerevisiae, Rad17 and Mec3 interact physically in vivo (yeast two-hybrid and co-immunoprecipitation). Ddc1 co-sediments and co-immunoprecipitates with both Rad17 and Mec3, forming a trimeric complex. Rad24 does not associate with Rad17, Mec3, or Ddc1. DDC1 overexpression partially suppresses rad24 deletion phenotypes, placing the Rad17-Mec3-Ddc1 complex downstream of Rad24.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, gel filtration co-sedimentation, genetic epistasis (dosage suppression)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Y2H + Co-IP + co-sedimentation + epistasis) in one study\",\n      \"pmids\": [\"9891048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"S. cerevisiae Rad24 forms an RFC-like complex with the four small RFC subunits Rfc2, Rfc3, Rfc4, and Rfc5 (but not Rfc1), identified by purification and mass spectrometry. Reciprocal co-immunoprecipitation confirmed these interactions.\",\n      \"method\": \"Biochemical purification to homogeneity, mass spectrometry, reciprocal co-immunoprecipitation\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — purification to homogeneity, mass spectrometry identification, reciprocal Co-IP, replicated across multiple subsequent studies\",\n      \"pmids\": [\"10660302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"S. cerevisiae Rad24 physically interacts with RFC subunits Rfc2 and Rfc5 and co-sediments with Rfc5. The conserved NTP-binding motif (Lys115) of Rad24 is required for its interaction with RFC proteins and for checkpoint function. RAD24 overexpression suppresses the checkpoint defect of rfc5-1 mutants.\",\n      \"method\": \"Co-immunoprecipitation, co-sedimentation, site-directed mutagenesis (K115E, K115R), dosage suppression, Rad53 phosphorylation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, mutagenesis of NTP-binding motif, functional rescue; independently replicated by Green et al. 2000\",\n      \"pmids\": [\"9710632\", \"10913172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human Rad17 is chromatin-associated throughout the cell cycle independently of DNA damage. Phosphorylated Rad17 preferentially associates with sites of ongoing DNA replication and interacts with DNA polymerase epsilon (co-immunoprecipitation).\",\n      \"method\": \"Chromatin fractionation, co-immunoprecipitation with DNA polymerase epsilon, BrdU incorporation to mark replication sites, immunofluorescence\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP of endogenous interaction plus chromatin fractionation, single lab\",\n      \"pmids\": [\"14500819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"RAD17 deletion in human somatic cells leads to acute chromosomal aberrations and endoreduplication at high rates, demonstrating that Rad17 is essential for cell viability and chromosomal stability, linking checkpoint function to ploidy control.\",\n      \"method\": \"Conditional RAD17 knockout in human somatic cells, flow cytometry for ploidy, cytogenetic analysis for chromosomal aberrations\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional somatic KO with defined chromosomal and cell viability phenotype, clean genetic approach\",\n      \"pmids\": [\"12672690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The deubiquitylase USP20 interacts with Rad17, stabilizes Rad17 protein in steady-state and after DNA damage in a proteasome-dependent manner, and is required for proper Chk1 phosphorylation by ATR. USP20 depletion impairs homologous recombination repair of collapsed replication forks.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, ubiquitination assays, Chk1 phosphorylation assay, HR repair assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP of USP20-Rad17 interaction, siRNA functional phenotype, single lab\",\n      \"pmids\": [\"24923443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Fission yeast Rad17 associates with chromatin in response to DNA damage (MMS or ionizing radiation) but dissociates from chromatin during S-phase stall (hydroxyurea). Rad17 complexes in vivo with the Rfc small subunit Rfc2 but not Rfc1. A checkpoint-defective mutant Rad17(K118E) cannot bind ATP, shows reduced chromatin binding, and reduced complex formation with Rfc2, indicating ATP binding is required for chromatin association and RFC complex formation.\",\n      \"method\": \"Chromatin fractionation, co-immunoprecipitation, site-directed mutagenesis (K118E), ATP binding assays in S. pombe\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chromatin fractionation plus Co-IP plus mutagenesis with multiple experimental conditions, consistent with mammalian studies\",\n      \"pmids\": [\"11313455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mouse Rad17 deletion leads to embryonic lethality during early/mid-gestation. Truncated mRad17-expressing ES cells are hypersensitive to DNA-damaging agents and display impaired homologous recombination (strongly reduced gene targeting efficiency), demonstrating a role for Rad17 in DNA damage-dependent recombination beyond checkpoint signaling.\",\n      \"method\": \"Targeted gene deletion in mice and ES cells, clonogenic survival assays with DNA-damaging agents, gene targeting efficiency assay for HR, cell cycle checkpoint assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO in ES cells with defined recombination phenotype; embryonic lethality confirms essential role\",\n      \"pmids\": [\"15297881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HIV-1 Vpr-mediated G2 arrest requires Rad17 and Hus1. Vpr activates ATR signaling, and knockdown/mutation of Rad17 or Hus1 prevents Vpr-induced G2 arrest, phosphorylation of histone H2AX, and formation of γH2AX/BRCA1 nuclear foci.\",\n      \"method\": \"siRNA knockdown of Rad17 and Hus1, flow cytometry for G2 arrest, immunofluorescence for γH2AX and BRCA1 foci in human cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA functional knockdown with multiple readouts, single lab, mechanistic placement in ATR pathway\",\n      \"pmids\": [\"15485898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ATR and Rad17 collaborate to regulate Rad9 localization at DNA damage sites. DNA damage or replication stress causes Rad17-dependent immobilization of Rad9 into nuclear foci. Expression of phosphorylation-deficient Rad17(AA) or ATR downregulation reduces the number of cells with Rad9 foci and increases the dynamic behavior of Rad9 within foci (measured by FRAP).\",\n      \"method\": \"Immunofluorescence, FRAP (fluorescence recovery after photobleaching), siRNA knockdown of ATR, overexpression of Rad17(AA) mutant in human cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP provides direct measurement of protein dynamics at damage sites plus mutagenesis, single lab\",\n      \"pmids\": [\"19020305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ATPase activity of Rad17 is required for its chromatin association and for ATR-mediated S-phase checkpoint activation in response to low-dose UV radiation in human cells.\",\n      \"method\": \"ATPase-deficient Rad17 mutant expression, chromatin fractionation, S-phase checkpoint assay (DNA synthesis inhibition) in human cells\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis of ATPase activity with functional checkpoint readout, single lab\",\n      \"pmids\": [\"15235112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A conserved KYxxL motif in the AAA+ domain of Rad17 is essential for interaction with the 9-1-1 complex. Rad17 KYxxL mutants show increased UV-induced Rad17 phosphorylation, suggesting the 9-1-1 complex negatively regulates Rad17 phosphorylation. Nucleotide-binding activity of Rad17 is required for its nuclear localization.\",\n      \"method\": \"Site-directed mutagenesis of KYxxL motif, co-immunoprecipitation, phosphorylation assays by western blot, nuclear localization analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — mutagenesis plus Co-IP plus localization, single lab\",\n      \"pmids\": [\"27387238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The polyanionic C-terminal tail of human Rad17 contains a conserved sequence motif (iVERGE) that is required for interaction with the 9-1-1 complex and regulation of ATR-Chk1 signaling.\",\n      \"method\": \"Deletion mutagenesis of C-terminal tail, co-immunoprecipitation with 9-1-1, Chk1 phosphorylation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — mutagenesis plus Co-IP, single lab, mechanistic placement\",\n      \"pmids\": [\"28666868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Casein kinase 2 (CK2) constitutively phosphorylates Rad17 at Ser667 within the C-terminal iVERGE motif, and this phosphorylation is required for interaction between Rad17 and the 9-1-1 complex. CK2 inhibition by CX-4945/Silmitasertib impairs Rad17-9-1-1 interaction in a Ser667-dependent manner.\",\n      \"method\": \"Site-directed mutagenesis (S667A), CK2 inhibitor treatment, co-immunoprecipitation, in vitro CK2 kinase assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — in vitro kinase assay plus mutagenesis plus Co-IP, single lab\",\n      \"pmids\": [\"29902452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CK1δ/ε phosphorylates Rad17 at Thr670. T670 phosphorylation promotes Ser667 phosphorylation (and vice versa), and phosphomimetic T670 mutations enhance interaction with the 9-1-1 complex, indicating multi-site phosphorylation at the C-terminal iVERGE motif regulates ATR-Chk1 signaling.\",\n      \"method\": \"In vitro CK1δ/ε kinase assay, phosphomimetic mutagenesis, co-immunoprecipitation with 9-1-1\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — in vitro kinase assay plus mutagenesis plus Co-IP, single lab, extends prior CK2 finding\",\n      \"pmids\": [\"31353086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Crystal structure (2.1 Å) of human 9-1-1 bound to a RAD17 N-terminal peptide containing a RAD1-binding motif was determined. The N-terminal region of RAD17 binds specifically to the RAD1 subunit of 9-1-1 via defined interactions. The RAD1-binding motif of RHINO competes with the RAD17 N-terminal region for RAD1 binding, implying functional roles in 9-1-1 loading/unloading.\",\n      \"method\": \"X-ray crystallography (2.1 Å), peptide binding assays, competition assays with RHINO peptide\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure with competition validation, single study\",\n      \"pmids\": [\"36841485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Upon replication block (hydroxyurea) in late S phase, co-immunoprecipitation showed interaction of RFC p37 subunit with Rad17, and PCNA with Rad9 and RFC p37. Enhanced colocalization of Rad17 and PCNA was observed in late S phase after hydroxyurea treatment, suggesting Rad17/RFC is recruited to DNA lesions and enables 9-1-1 to interact with PCNA.\",\n      \"method\": \"Co-immunoprecipitation from hydroxyurea-treated HeLa cells, immunofluorescence colocalization\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP and colocalization, single lab, no mutagenesis validation\",\n      \"pmids\": [\"12400013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In chicken DT40 cells, Rad17 deletion dramatically reduces gene targeting (homologous recombination) efficiency and reduces sister chromatid exchange frequency even in BLM-deficient cells, indicating Rad17 plays a direct role in homologous recombination beyond replication checkpoint signaling.\",\n      \"method\": \"Gene targeting (HR efficiency assay) in Rad17-/- and blm/rad17 DT40 cells, sister chromatid exchange assay, growth curve analysis\",\n      \"journal\": \"Genes & genetic systems\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean gene KO with quantitative HR and SCE assays, consistent with mouse ES cell data from Budzowska et al.\",\n      \"pmids\": [\"19168994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Pol κ depletion in glioblastoma cells facilitates temozolomide-induced Rad17 ubiquitination and proteasomal degradation, thereby silencing ATR-Chk1 signaling. Overexpression of Rad17 in Pol κ-depleted cells restored HR efficiency and desensitized cells to temozolomide, placing Rad17 downstream of Pol κ in protection of stalled replication forks.\",\n      \"method\": \"Ubiquitination assays, western blotting for Rad17 protein levels, HR repair assay, Rad17 overexpression rescue, siRNA knockdown\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — ubiquitination assay plus functional rescue by Rad17 overexpression, single lab\",\n      \"pmids\": [\"26960975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The Ddc1-Mec3-Rad17 (9-1-1) complex in yeast regulates DNA replication-coupled nucleosome assembly. Rad17 deletion reduces deposition of newly synthesized H3-H4 onto replicated DNA, increases association of histone chaperone Asf1 with Rad53 (reducing Asf1-H3 interaction), and increases H3-H4 interactions with CAF-1 and Rtt106.\",\n      \"method\": \"Genetic epistasis, chromatin immunoprecipitation of newly synthesized histones (SNAP-ChIP), co-immunoprecipitation of Asf1-Rad53 and histone-chaperone interactions in yeast\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — multiple Co-IP interactions plus chromatin-bound histone deposition assay, single lab\",\n      \"pmids\": [\"24573675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"v-Src suppresses ATR-Chk1 signaling by inhibiting the interaction between Rad17 and Rad9 in the chromatin fraction, without affecting RPA32 phosphorylation, ATR autophosphorylation, or TopBP1-Rad9 interaction, and induces replication fork collapse.\",\n      \"method\": \"Co-immunoprecipitation from chromatin fraction, Chk1 phosphorylation assay, replication fork collapse assay, v-Src overexpression\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP in chromatin fraction, single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"24971543\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAD17 (human) encodes the large subunit of an RFC-like clamp loader complex (RAD17-RFC2-5) that recognizes RPA-coated ssDNA at DNA damage sites and replication forks, loads the PCNA-like 9-1-1 (RAD9-RAD1-HUS1) checkpoint clamp onto 5'-recessed dsDNA-ssDNA junctions in an ATP-dependent manner, and thereby activates the ATR-TopBP1-Claspin-Chk1 checkpoint signaling cascade; ATR phosphorylates RAD17 at Ser635/Ser645, which is required for sustained Chk1 activation and Claspin recruitment, while casein kinases CK2 and CK1δ/ε constitutively phosphorylate the C-terminal iVERGE motif at Ser667/Thr670 to promote RAD17-9-1-1 interaction; RAD17 also recruits the MRN complex to DSBs through ATM-dependent phosphorylation at Thr622 and interacts with MCM7 and DNA polymerase epsilon at replication forks; following checkpoint activation, Cdh1/APC ubiquitinates RAD17 for proteasomal degradation to allow checkpoint termination and cell cycle re-entry; RAD17 is essential for genomic stability, homologous recombination repair, and embryonic viability in mammals.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAD17 is the large subunit of an RFC-like (clamp loader) complex that initiates the ATR-dependent DNA damage and replication checkpoint by loading the PCNA-like 9-1-1 (RAD9-RAD1-HUS1) clamp onto damaged DNA [#0, #6]. RAD17 assembles with the four small RFC subunits RFC2-RFC5 into a heteropentameric, ATPase-active complex structurally analogous to RFC, and this assembly and RAD17 chromatin association require its conserved nucleotide-binding motif [#6, #14, #19]. RPA-coated single-stranded DNA stimulates RAD17-RFC binding to primed and gapped substrates, and unlike replicative RFC the RAD17 complex recognizes recessed 5' dsDNA-ssDNA junctions to load and correctly orient 9-1-1 in an ATP-hydrolysis-dependent manner [#1, #5, #7]. Engagement of 9-1-1 is mediated through a RAD1-binding motif in the RAD17 N-terminus, a conserved KYxxL motif in its AAA+ domain, and a polyanionic C-terminal iVERGE element whose phosphorylation by CK2 (Ser667) and CK1\\u03b4/\\u03b5 (Thr670) promotes the RAD17-9-1-1 interaction [#24, #25, #26, #27, #28]. Once loaded, RAD17 and 9-1-1 enable ATR to phosphorylate RAD17 at Ser635/Ser645, a modification required for the G1/S and G2 checkpoints, for recruitment of Claspin, and for sustained Chk1 activation, and RAD17 mediates 9-1-1 association with the ATR activator TopBP1 [#2, #3, #4, #11]. Beyond ATR signaling, RAD17 supports an ATM branch: ATM phosphorylates RAD17 at Thr622 to drive early MRN complex recruitment to double-strand breaks and homologous recombination repair, and RAD17 is essential for genomic stability, HR, chromosomal integrity, and embryonic viability [#10, #17, #20, #30]. Checkpoint signaling is reversed when Cdh1/APC ubiquitinates RAD17 for proteasomal degradation, permitting checkpoint termination and cell cycle re-entry, while the deubiquitylase USP20 opposes this turnover to stabilize RAD17 [#12, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that the checkpoint Rad17/Mec3/Ddc1 proteins form a stable trimeric clamp acting downstream of the separate Rad24 clamp-loader, defining a two-module architecture for checkpoint sensing.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, gel filtration co-sedimentation and dosage suppression in S. cerevisiae\",\n      \"pmids\": [\"9891048\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the biochemical loading mechanism\", \"Human orthology not yet established\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showed the checkpoint clamp loader is an RFC variant in which Rad24 (RAD17 ortholog) replaces Rfc1 while retaining the four small RFC subunits, distinguishing it from replicative RFC.\",\n      \"evidence\": \"Purification to homogeneity, mass spectrometry and reciprocal Co-IP in S. cerevisiae; ATP-binding motif mutagenesis (K115E/K115R) and dosage suppression of rfc5-1\",\n      \"pmids\": [\"10660302\", \"9710632\", \"10913172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not show direct clamp loading onto DNA\", \"Human complex composition not confirmed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified RAD17 as a direct ATR/ATM substrate at Ser635/Ser645 whose phosphorylation is required for DNA-damage checkpoints and for damage-inducible association with 9-1-1, linking RAD17 modification to checkpoint output.\",\n      \"evidence\": \"In vitro ATR/ATM kinase assays, S635A/S645A mutagenesis, Co-IP and G1/S and G2 checkpoint assays in human cells; ATP-binding/chromatin coupling in S. pombe (K118E)\",\n      \"pmids\": [\"11418864\", \"11687627\", \"11313455\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how phosphorylation alters 9-1-1 engagement structurally\", \"Order of loading versus phosphorylation unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated that RAD17 recruits 9-1-1 onto chromatin after damage and that RAD17-loaded 9-1-1 is required for ATR to recognize its substrates, placing RAD17 upstream as a damage sensor.\",\n      \"evidence\": \"Chromatin fractionation, Co-IP, siRNA and epistasis in human cells\",\n      \"pmids\": [\"11799063\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of ATR substrate licensing by 9-1-1 not defined\", \"DNA structure recognized not yet identified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Reconstituted the core reaction, showing RPA stimulates RAD17-RFC binding to ssDNA/gapped substrates and that the complex loads 9-1-1 onto partial duplexes via ATP, using 5' junctions unlike replicative RFC.\",\n      \"evidence\": \"In vitro reconstitution with purified human and yeast proteins, DNA-binding and ATP-hydrolysis/sliding assays\",\n      \"pmids\": [\"14605214\", \"12604797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic geometry of junction recognition not yet resolved\", \"In vivo substrate at forks not directly visualized\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Linked RAD17 to active replication, showing constitutive chromatin association and phosphorylation-dependent localization to replication sites and interaction with DNA polymerase epsilon, and that RAD17 loss causes endoreduplication and chromosomal instability.\",\n      \"evidence\": \"Chromatin fractionation, Co-IP with Pol epsilon, BrdU labeling; conditional human somatic knockout with cytogenetics and ploidy analysis\",\n      \"pmids\": [\"14500819\", \"12672690\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct functional role of Pol epsilon interaction not defined\", \"Mechanism linking checkpoint loss to endoreduplication unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Established RAD17 ATPase activity as required for chromatin loading and S-phase checkpoint, identified MCM7 as a partner needed for ATR focus formation, and demonstrated RAD17 is essential for embryonic viability and homologous recombination.\",\n      \"evidence\": \"ATPase-mutant analysis and S-phase checkpoint assays; MCM7 Co-IP and siRNA; targeted mouse/ES cell knockout with HR (gene targeting) and survival assays\",\n      \"pmids\": [\"15235112\", \"15538388\", \"15297881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MCM7 stabilizes ATR not mechanistically defined\", \"Whether HR role is separable from checkpoint signaling unresolved here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed RAD17 and ATR jointly immobilize RAD9 into stable damage foci, providing direct dynamic evidence that RAD17 retains the 9-1-1 clamp at lesions.\",\n      \"evidence\": \"FRAP, immunofluorescence, ATR siRNA and RAD17(AA) mutant in human cells\",\n      \"pmids\": [\"19020305\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Does not define molecular tether retaining 9-1-1\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined RAD17 ATP binding/hydrolysis as the switch coupling 9-1-1 loading to TopBP1 chromatin accumulation, and established Cdh1/APC-mediated RAD17 degradation as the mechanism terminating the checkpoint to allow cell cycle re-entry.\",\n      \"evidence\": \"Xenopus extract ATPase-mutant assays and TopBP1 chromatin binding; ubiquitination assays, Cdh1/APC Co-IP and degradation-resistant mutant in human cells\",\n      \"pmids\": [\"20110345\", \"20424596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Indirect link between 9-1-1 and TopBP1 not fully resolved\", \"Signal triggering Cdh1/APC targeting of RAD17 unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed an ATM-branch role for RAD17, with ATM phosphorylation at Thr622 driving MRN recruitment to DSBs and HR, and showed RAD17 supports HR independent of replication checkpoint signaling.\",\n      \"evidence\": \"Phospho-mapping (MS), T622A mutagenesis, NBS1 Co-IP and HR assays in human cells; gene targeting and sister chromatid exchange in DT40 cells; USP20 stabilization of RAD17\",\n      \"pmids\": [\"24534091\", \"19168994\", \"24923443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a clamp loader directly promotes HR strand exchange unresolved\", \"Crosstalk between ATM and ATR RAD17 phospho-sites not integrated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Distinguished RAD17-dependent rapid Chk1 phosphorylation from an Nbs1-dependent ATR mode acting on RPA32, showing RAD17 governs a specific branch of ATR activation at replication-associated breaks.\",\n      \"evidence\": \"siRNA, in vitro ATR kinase assays and phospho-specific antibodies in Xenopus extracts\",\n      \"pmids\": [\"23684611\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Branch selection determinants not defined\", \"Relative contribution in vivo unquantified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapped the molecular determinants of RAD17-9-1-1 contact, defining KYxxL, the C-terminal iVERGE motif, and its constitutive phosphorylation by CK2 (Ser667) and CK1\\u03b4/\\u03b5 (Thr670) as regulators of clamp engagement and ATR-Chk1 signaling.\",\n      \"evidence\": \"Motif/deletion and phosphomimetic mutagenesis, in vitro CK2 and CK1\\u03b4/\\u03b5 kinase assays, CK2 inhibitor (CX-4945), Co-IP in human cells\",\n      \"pmids\": [\"27387238\", \"28666868\", \"29902452\", \"31353086\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab series\", \"In vivo checkpoint requirement of each site not fully tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided atomic-resolution mechanism for clamp specificity and orientation, showing how RAD17-RFC recognizes recessed 5' DNA ends and how the RAD17 N-terminus docks onto the RAD1 subunit in competition with RHINO.\",\n      \"evidence\": \"Cryo-EM of human RAD17-RFC:9-1-1:DNA and 2.1 \\u00c5 crystal structure of 9-1-1 bound to a RAD17 N-terminal peptide with RHINO competition assays\",\n      \"pmids\": [\"35819203\", \"36841485\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of RHINO competition in cells not established\", \"Dynamics of loading/unloading cycle not captured\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RAD17 mechanistically promotes homologous recombination beyond loading the 9-1-1 checkpoint clamp, and how the ATM-Thr622 and ATR-Ser635/645 phospho-branches are coordinated, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reconstitution of a direct RAD17 role in strand exchange\", \"Integration of ATM and ATR RAD17 modifications uncharacterized\", \"Physiological role of Pol epsilon and MCM7 interactions at unperturbed forks unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [5, 6, 11, 19, 23]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 6, 7]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [6, 11, 23]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 10, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [22, 24]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 16, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 2, 4, 9]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [10, 20, 30]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2, 3, 12, 17]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [1, 16]}\n    ],\n    \"complexes\": [\n      \"RAD17-RFC (RAD17-RFC2-5) clamp loader\",\n      \"9-1-1 (RAD9-RAD1-HUS1) clamp (loaded substrate)\"\n    ],\n    \"partners\": [\n      \"RAD9\",\n      \"RAD1\",\n      \"HUS1\",\n      \"ATR\",\n      \"TopBP1\",\n      \"Claspin\",\n      \"NBS1\",\n      \"MCM7\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}