{"gene":"CENPP","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2006,"finding":"CENP-P (CENPP) is a component of the CENP-A nucleosome distal (CAD) centromere complex, assembling on the CENP-A NAC (comprised of CENP-M, CENP-N, CENP-T, CENP-U(50), CENP-C, CENP-H). CENP-P localizes to centromeres as part of the CAD group along with CENP-K, CENP-L, CENP-O, CENP-Q, CENP-R, and CENP-S.","method":"Affinity purification / mass spectrometry, co-immunoprecipitation, immunofluorescence localization","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and MS identification across multiple labs, foundational CCAN discovery paper with multiple orthogonal methods","pmids":["16622419"],"is_preprint":false},{"year":2006,"finding":"Disruption of the CENP-A NAC (which CENP-P depends on for centromere assembly) causes errors of chromosome alignment and segregation that preclude cell survival, establishing CENP-P's functional requirement in mitotic fidelity through its position in the CCAN hierarchy.","method":"RNAi knockdown with mitotic phenotype readout (chromosome alignment/segregation errors)","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean loss-of-function with defined cellular phenotype, but CENP-P itself was not individually depleted in the abstract; effect attributed to disruption of the complex","pmids":["16622419"],"is_preprint":false},{"year":2012,"finding":"CENP-P/O/R/Q/U form a tightly packed sub-complex with multifold protein-protein interactions. The sub-complex is not pre-assembled in the cytoplasm but is assembled stepwise on kinetochores, with CENP-O/P loading as heterodimers. Binding to the CCAN is largely mediated through interactions with CENP-L and CENP-K. Once assembled, CENP-P/O/R/Q/U exchanges slowly with the free nucleoplasmic pool.","method":"Fluorescent three-hybrid (F3H) assay, FRET in living mammalian cells, SNAP-tag experiments, immunostaining, FRAP","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal live-cell methods (F3H, FRET, SNAP-tag, FRAP) establishing protein-protein interactions and kinetochore assembly dynamics","pmids":["23028590"],"is_preprint":false},{"year":2012,"finding":"CENP-P/O/R/Q/U kinetochore loading occurs during S-phase, similar to the nucleosome-binding CCAN components CENP-T/W/N. During late S-phase, CENP-Q and CENP-U (but not CENP-R) undergo oligomerization after the kinetochore-binding step, suggesting a pre-mitotic maturation step.","method":"SNAP-tag pulse-chase experiments and immunostaining","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SNAP-tag and immunostaining in single lab, two orthogonal methods","pmids":["23028590"],"is_preprint":false},{"year":2014,"finding":"CENP-P is required for kinetochore localization of CENP-U; when CENP-U is absent (or the CENP-O complex is disrupted), all CENP-O complex proteins including CENP-P disappear from kinetochores while other kinetochore proteins are unaffected, indicating interdependence within the CENP-O complex for kinetochore targeting.","method":"Conditional knockout (CENP-U deficiency in mouse ES cells) with immunofluorescence to assess kinetochore localization of complex members","journal":"Chromosome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with defined localization phenotype in mouse ES cells, single lab","pmids":["24481920"],"is_preprint":false},{"year":2014,"finding":"The CENP-O complex (comprising CENP-O, CENP-P, CENP-Q and CENP-U) targets polo-like kinase 1 (Plk1) to kinetochores; CENP-P and CENP-Q subunits are specifically required for kinetochore recruitment of CENP-U, which in turn recruits Plk1.","method":"RNAi depletion of CENP-Q/CENP-O complex subunits with immunofluorescence quantification of Plk1 kinetochore levels and chromosome congression assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi loss-of-function with quantitative kinetochore localization readout, single lab, two orthogonal methods","pmids":["25395579"],"is_preprint":false},{"year":2017,"finding":"In yeast (Kluyveromyces lactis), the COMA complex (Ame1/Okp1/Ctf19/Mcm21, orthologs of CENP-U/Q/P/O) has a defined subunit topology: Ctf19 (CENP-P ortholog) forms an RWD domain-based heterodimer with Mcm21 (CENP-O ortholog) that binds a specific motif in Okp1 (CENP-Q ortholog), configuring a branch of the inner kinetochore and tethering Chl4/Iml3 (CENP-N/L orthologs).","method":"Crystal structure of Ctf19-Mcm21 RWD domains bound with Okp1 peptide, hydrogen-deuterium exchange MS, nanoflow ESI-MS","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with HDX-MS and native MS; multiple orthogonal structural and biophysical methods in one study","pmids":["29046335"],"is_preprint":false},{"year":2018,"finding":"The human CENP-OPQUR complex binds to a joint interface on the CENP-HIKM and CENP-LN complexes to form an 11-subunit CCAN core, which then connects KMN and CENP-A in a reconstituted 26-subunit particle. CENP-P is thus part of the structural bridge between CENP-A chromatin and the microtubule-binding machinery.","method":"In vitro reconstitution of recombinant 26-subunit kinetochore particle, biochemical binding assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — full in vitro reconstitution of a 26-subunit kinetochore particle with biochemical validation of connectivity","pmids":["30174292"],"is_preprint":false},{"year":2019,"finding":"In budding yeast, the COMA complex (Ctf19/Mcm21/Ame1/Okp1, orthologs of CENP-P/O/U/Q) selectively binds Cse4 (CENP-A) nucleosomes through the Cse4 N-terminus. The Ctf19 C-terminus (CENP-P ortholog C-terminus) interacts with the Sli15/Ipl1 (INCENP/Aurora B) core-CPC in vitro, and deletion of this C-terminus affects chromosome segregation fidelity.","method":"In vitro reconstitution of kinetochore complexes guided by crosslinking MS; genetic rescue experiments (tethering Sli15 to Ame1/Okp1 rescues Ctf19 depletion synthetic lethality)","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — crosslink-guided in vitro reconstitution plus genetic epistasis rescue experiment, multiple orthogonal methods","pmids":["31112132"],"is_preprint":false},{"year":2021,"finding":"CENP-U is recruited to kinetochores by the CENP-P and CENP-Q subunits of the CENP-O complex; CENP-U and Bub1 redundantly recruit Plk1 to kinetochores to stabilize kinetochore-microtubule attachments. The CENP-O complex (unlike its budding yeast homolog) does not regulate centromeric localization of Aurora B in human cells.","method":"Stable protein depletion (siRNA/shRNA), immunofluorescence quantification of Plk1 and Aurora B kinetochore levels, chromosome segregation assays, pharmacological inhibition","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal depletion experiments with defined molecular phenotype, pharmacological validation, replicated across conditions","pmids":["34551298"],"is_preprint":false},{"year":2021,"finding":"CDK4 occupies the promoter region of the CENPP gene in mouse keratinocytes and regulates its transcription; gain- and loss-of-function experiments demonstrated that CDK4 participates in transcriptional regulation of CENP-P expression.","method":"Chromatin immunoprecipitation (ChIP) followed by RT-qPCR; CDK4 gain- and loss-of-function experiments with CENPP mRNA quantification","journal":"Oncology letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP-qPCR with gain/loss-of-function, single lab, single study","pmids":["34429772"],"is_preprint":false}],"current_model":"CENPP (CENP-P) is a constitutively kinetochore-localized subunit of the CENP-O complex (CENP-O/P/Q/R/U), which assembles stepwise during S-phase onto the CCAN through interactions with CENP-L and CENP-K; CENP-P forms an RWD-domain heterodimer with CENP-O (yeast Ctf19-Mcm21) that docks onto CENP-Q (Okp1), thereby positioning the CENP-OPQUR complex at a joint interface of CENP-HIKM and CENP-LN to bridge CENP-A chromatin with the KMN microtubule-binding machinery, and the complex recruits Plk1 to kinetochores (via CENP-U) in parallel with Bub1 to stabilize kinetochore-microtubule attachments and ensure accurate chromosome segregation."},"narrative":{"mechanistic_narrative":"CENPP (CENP-P) is a constitutive subunit of the inner-kinetochore CCAN that helps ensure accurate chromosome segregation during mitosis [PMID:16622419]. It functions within the CENP-O complex (CENP-O/P/Q/U/R), which is not pre-assembled in the cytoplasm but loads stepwise onto kinetochores during S-phase, with CENP-P and CENP-O entering as a heterodimer and the complex docking onto the CCAN largely through interactions with CENP-L and CENP-K [PMID:23028590]. Structural work in yeast established the molecular basis of this assembly: the CENP-P ortholog (Ctf19) forms an RWD-domain heterodimer with the CENP-O ortholog (Mcm21) that binds a motif in the CENP-Q ortholog (Okp1), positioning this branch of the inner kinetochore [PMID:29046335]. Within the reconstituted human kinetochore, the CENP-OPQUR module binds a joint interface on the CENP-HIKM and CENP-LN complexes, placing CENP-P in the structural bridge that connects CENP-A chromatin to the KMN microtubule-binding machinery [PMID:30174292]. Functionally, CENP-P and CENP-Q are required to recruit CENP-U to kinetochores, and CENP-U in turn recruits Plk1 in parallel with Bub1 to stabilize kinetochore-microtubule attachments [PMID:24481920, PMID:25395579, PMID:34551298]; loss of the CENP-O complex removes all its subunits from kinetochores and causes chromosome alignment and segregation errors [PMID:16622419, PMID:24481920].","teleology":[{"year":2006,"claim":"Established CENP-P as a bona fide centromere component by placing it within the CENP-A-associated CCAN, defining its cellular address before any mechanism was known.","evidence":"Affinity purification/MS, co-IP, and immunofluorescence localization of the CAD/NAC group","pmids":["16622419"],"confidence":"High","gaps":["Did not resolve CENP-P's specific binding partners within the complex","CENP-P was not individually depleted to define its own loss-of-function phenotype"]},{"year":2006,"claim":"Linked the CCAN module containing CENP-P to mitotic fidelity, showing that disruption of the assembly it depends on causes lethal chromosome alignment and segregation errors.","evidence":"RNAi knockdown of the CENP-A NAC with mitotic phenotype readout","pmids":["16622419"],"confidence":"Medium","gaps":["Phenotype attributed to NAC disruption rather than CENP-P depletion specifically","Does not separate CENP-P's contribution from other complex subunits"]},{"year":2012,"claim":"Defined how the CENP-P-containing sub-complex assembles, showing it loads stepwise on kinetochores as CENP-O/P heterodimers rather than as a pre-formed cytoplasmic unit, with CCAN docking via CENP-L and CENP-K.","evidence":"F3H, FRET, SNAP-tag, immunostaining, and FRAP in living mammalian cells","pmids":["23028590"],"confidence":"High","gaps":["Did not provide atomic-resolution interface details","Functional consequence of slow exchange dynamics not established"]},{"year":2012,"claim":"Placed CENP-O complex loading temporally in S-phase, identifying a late-S oligomerization maturation step for CENP-Q/CENP-U.","evidence":"SNAP-tag pulse-chase and immunostaining","pmids":["23028590"],"confidence":"Medium","gaps":["Whether CENP-P itself undergoes maturation/oligomerization not addressed","Single-lab timing data"]},{"year":2014,"claim":"Demonstrated interdependence within the complex, showing CENP-P is required for CENP-U kinetochore localization and that the subunits stand or fall together for targeting.","evidence":"Conditional CENP-U knockout in mouse ES cells with immunofluorescence","pmids":["24481920"],"confidence":"Medium","gaps":["Did not determine direct vs indirect basis of CENP-P-CENP-U dependence","Single-lab localization assay"]},{"year":2014,"claim":"Connected the CENP-O complex to a signaling output by showing CENP-P/Q recruit CENP-U, which targets Plk1 to kinetochores.","evidence":"RNAi depletion with Plk1 kinetochore quantification and congression assays","pmids":["25395579"],"confidence":"Medium","gaps":["Direct CENP-U-Plk1 binding mode not resolved here","Relative contribution of CENP-P vs CENP-Q to recruitment not separated"]},{"year":2017,"claim":"Provided the structural mechanism of complex assembly, showing the CENP-P ortholog forms an RWD-domain heterodimer with the CENP-O ortholog that binds the CENP-Q ortholog to configure the inner kinetochore.","evidence":"Crystal structure of Ctf19-Mcm21 RWD domains with Okp1 peptide, HDX-MS, native MS (K. lactis)","pmids":["29046335"],"confidence":"High","gaps":["Structure derived from yeast orthologs, not human CENP-P","Human CENP-P structure not solved"]},{"year":2018,"claim":"Positioned CENP-P architecturally within the human kinetochore, showing the CENP-OPQUR module bridges CENP-HIKM/CENP-LN to connect CENP-A chromatin with KMN.","evidence":"In vitro reconstitution of a 26-subunit recombinant kinetochore particle with biochemical binding assays","pmids":["30174292"],"confidence":"High","gaps":["Reconstituted system may not capture all in vivo regulation","Microtubule attachment function not directly assayed"]},{"year":2019,"claim":"Revealed a regulatory function for the CENP-P ortholog C-terminus, linking it to chromosome segregation fidelity via interaction with the Aurora B/CPC core in yeast.","evidence":"Crosslink-guided in vitro reconstitution plus genetic rescue/epistasis (S. cerevisiae)","pmids":["31112132"],"confidence":"High","gaps":["CPC interaction shown in yeast; human CENP-P-CPC interaction not established","2021 work indicates the human complex does not regulate Aurora B localization, leaving species divergence unresolved"]},{"year":2021,"claim":"Refined the human signaling model, confirming CENP-P/Q recruit CENP-U and that CENP-U and Bub1 redundantly recruit Plk1 to stabilize attachments, while excluding Aurora B regulation by the human complex.","evidence":"siRNA/shRNA depletion, Plk1/Aurora B kinetochore quantification, segregation assays, pharmacological inhibition","pmids":["34551298"],"confidence":"High","gaps":["Mechanistic basis of the species difference in Aurora B regulation not resolved","Direct CENP-P contacts to CENP-U not structurally defined"]},{"year":2021,"claim":"Identified an upstream transcriptional regulator, showing CDK4 occupies the CENPP promoter and regulates its expression in keratinocytes.","evidence":"ChIP-qPCR plus CDK4 gain/loss-of-function with CENPP mRNA readout (mouse)","pmids":["34429772"],"confidence":"Medium","gaps":["Single-study, single-cell-type observation","Functional consequence of CDK4-driven CENPP expression not established","Direct vs indirect promoter regulation not distinguished"]},{"year":null,"claim":"How CENP-P contributes mechanistically to microtubule attachment stability beyond Plk1 recruitment, and whether the yeast CENP-P-CPC interaction has a human counterpart, remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No human structural model of CENP-P-containing interfaces resolved at atomic detail","CENP-P-specific (vs whole-complex) loss-of-function phenotype not isolated","Species divergence in Aurora B/CPC regulation unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,6,7]}],"localization":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[0,2,4]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[0,7]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,5,9]}],"complexes":["CENP-O complex (CENP-OPQUR)","CCAN","COMA (yeast ortholog)"],"partners":["CENPO","CENPQ","CENPU","CENPR","CENPL","CENPK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6IPU0","full_name":"Centromere protein P","aliases":[],"length_aa":288,"mass_kda":33.2,"function":"Component of the CENPA-CAD (nucleosome distal) complex, a complex recruited to centromeres which is involved in assembly of kinetochore proteins, mitotic progression and chromosome segregation. May be involved in incorporation of newly synthesized CENPA into centromeres via its interaction with the CENPA-NAC complex","subcellular_location":"Nucleus; Chromosome, centromere","url":"https://www.uniprot.org/uniprotkb/Q6IPU0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CENPP","classification":"Not Classified","n_dependent_lines":359,"n_total_lines":1208,"dependency_fraction":0.29718543046357615},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CENPP","total_profiled":1310},"omim":[{"mim_id":"611511","title":"MLF1-INTERACTING PROTEIN; MLF1IP","url":"https://www.omim.org/entry/611511"},{"mim_id":"611506","title":"CENTROMERIC PROTEIN Q; CENPQ","url":"https://www.omim.org/entry/611506"},{"mim_id":"611505","title":"CENTROMERIC PROTEIN P; CENPP","url":"https://www.omim.org/entry/611505"},{"mim_id":"611504","title":"CENTROMERIC PROTEIN O; CENPO","url":"https://www.omim.org/entry/611504"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skin 1","ntpm":20.3}],"url":"https://www.proteinatlas.org/search/CENPP"},"hgnc":{"alias_symbol":["RP11-19J3.3","CENP-P"],"prev_symbol":[]},"alphafold":{"accession":"Q6IPU0","domains":[{"cath_id":"3.10.110","chopping":"177-284","consensus_level":"high","plddt":93.2172,"start":177,"end":284}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6IPU0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6IPU0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6IPU0-F1-predicted_aligned_error_v6.png","plddt_mean":85.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CENPP","jax_strain_url":"https://www.jax.org/strain/search?query=CENPP"},"sequence":{"accession":"Q6IPU0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6IPU0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6IPU0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6IPU0"}},"corpus_meta":[{"pmid":"16622419","id":"PMC_16622419","title":"The human CENP-A centromeric nucleosome-associated complex.","date":"2006","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/16622419","citation_count":594,"is_preprint":false},{"pmid":"21751032","id":"PMC_21751032","title":"The ABCs of CENPs.","date":"2011","source":"Chromosoma","url":"https://pubmed.ncbi.nlm.nih.gov/21751032","citation_count":164,"is_preprint":false},{"pmid":"31112132","id":"PMC_31112132","title":"The COMA complex interacts with Cse4 and positions Sli15/Ipl1 at the budding yeast inner kinetochore.","date":"2019","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/31112132","citation_count":67,"is_preprint":false},{"pmid":"30174292","id":"PMC_30174292","title":"Reconstitution of a 26-Subunit Human Kinetochore Reveals Cooperative Microtubule Binding by CENP-OPQUR and NDC80.","date":"2018","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/30174292","citation_count":62,"is_preprint":false},{"pmid":"25395579","id":"PMC_25395579","title":"Chromosome congression is promoted by CENP-Q- and CENP-E-dependent pathways.","date":"2014","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/25395579","citation_count":43,"is_preprint":false},{"pmid":"34551298","id":"PMC_34551298","title":"Bub1 and CENP-U redundantly recruit Plk1 to stabilize kinetochore-microtubule attachments and ensure accurate chromosome segregation.","date":"2021","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/34551298","citation_count":36,"is_preprint":false},{"pmid":"23028590","id":"PMC_23028590","title":"Step-wise assembly, maturation and dynamic behavior of the human CENP-P/O/R/Q/U kinetochore sub-complex.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23028590","citation_count":33,"is_preprint":false},{"pmid":"37649101","id":"PMC_37649101","title":"Fathers' preconception smoking and offspring DNA methylation.","date":"2023","source":"Clinical 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rheumatology","url":"https://pubmed.ncbi.nlm.nih.gov/23418382","citation_count":26,"is_preprint":false},{"pmid":"38238903","id":"PMC_38238903","title":"Enriched Single-Nucleus RNA-Sequencing Reveals Unique Attributes of Distal Convoluted Tubule Cells.","date":"2024","source":"Journal of the American Society of Nephrology : JASN","url":"https://pubmed.ncbi.nlm.nih.gov/38238903","citation_count":15,"is_preprint":false},{"pmid":"31047894","id":"PMC_31047894","title":"RAP-8 ameliorates liver fibrosis by modulating cell cycle and oxidative stress.","date":"2019","source":"Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31047894","citation_count":14,"is_preprint":false},{"pmid":"26334372","id":"PMC_26334372","title":"Exposure to fluorescent light triggers down regulation of genes involved with mitotic progression in Xiphophorus skin.","date":"2015","source":"Comparative biochemistry and physiology. 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CENP-P localizes to centromeres as part of the CAD group along with CENP-K, CENP-L, CENP-O, CENP-Q, CENP-R, and CENP-S.\",\n      \"method\": \"Affinity purification / mass spectrometry, co-immunoprecipitation, immunofluorescence localization\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and MS identification across multiple labs, foundational CCAN discovery paper with multiple orthogonal methods\",\n      \"pmids\": [\"16622419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Disruption of the CENP-A NAC (which CENP-P depends on for centromere assembly) causes errors of chromosome alignment and segregation that preclude cell survival, establishing CENP-P's functional requirement in mitotic fidelity through its position in the CCAN hierarchy.\",\n      \"method\": \"RNAi knockdown with mitotic phenotype readout (chromosome alignment/segregation errors)\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean loss-of-function with defined cellular phenotype, but CENP-P itself was not individually depleted in the abstract; effect attributed to disruption of the complex\",\n      \"pmids\": [\"16622419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CENP-P/O/R/Q/U form a tightly packed sub-complex with multifold protein-protein interactions. The sub-complex is not pre-assembled in the cytoplasm but is assembled stepwise on kinetochores, with CENP-O/P loading as heterodimers. Binding to the CCAN is largely mediated through interactions with CENP-L and CENP-K. Once assembled, CENP-P/O/R/Q/U exchanges slowly with the free nucleoplasmic pool.\",\n      \"method\": \"Fluorescent three-hybrid (F3H) assay, FRET in living mammalian cells, SNAP-tag experiments, immunostaining, FRAP\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal live-cell methods (F3H, FRET, SNAP-tag, FRAP) establishing protein-protein interactions and kinetochore assembly dynamics\",\n      \"pmids\": [\"23028590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CENP-P/O/R/Q/U kinetochore loading occurs during S-phase, similar to the nucleosome-binding CCAN components CENP-T/W/N. During late S-phase, CENP-Q and CENP-U (but not CENP-R) undergo oligomerization after the kinetochore-binding step, suggesting a pre-mitotic maturation step.\",\n      \"method\": \"SNAP-tag pulse-chase experiments and immunostaining\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SNAP-tag and immunostaining in single lab, two orthogonal methods\",\n      \"pmids\": [\"23028590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CENP-P is required for kinetochore localization of CENP-U; when CENP-U is absent (or the CENP-O complex is disrupted), all CENP-O complex proteins including CENP-P disappear from kinetochores while other kinetochore proteins are unaffected, indicating interdependence within the CENP-O complex for kinetochore targeting.\",\n      \"method\": \"Conditional knockout (CENP-U deficiency in mouse ES cells) with immunofluorescence to assess kinetochore localization of complex members\",\n      \"journal\": \"Chromosome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with defined localization phenotype in mouse ES cells, single lab\",\n      \"pmids\": [\"24481920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The CENP-O complex (comprising CENP-O, CENP-P, CENP-Q and CENP-U) targets polo-like kinase 1 (Plk1) to kinetochores; CENP-P and CENP-Q subunits are specifically required for kinetochore recruitment of CENP-U, which in turn recruits Plk1.\",\n      \"method\": \"RNAi depletion of CENP-Q/CENP-O complex subunits with immunofluorescence quantification of Plk1 kinetochore levels and chromosome congression assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi loss-of-function with quantitative kinetochore localization readout, single lab, two orthogonal methods\",\n      \"pmids\": [\"25395579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In yeast (Kluyveromyces lactis), the COMA complex (Ame1/Okp1/Ctf19/Mcm21, orthologs of CENP-U/Q/P/O) has a defined subunit topology: Ctf19 (CENP-P ortholog) forms an RWD domain-based heterodimer with Mcm21 (CENP-O ortholog) that binds a specific motif in Okp1 (CENP-Q ortholog), configuring a branch of the inner kinetochore and tethering Chl4/Iml3 (CENP-N/L orthologs).\",\n      \"method\": \"Crystal structure of Ctf19-Mcm21 RWD domains bound with Okp1 peptide, hydrogen-deuterium exchange MS, nanoflow ESI-MS\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with HDX-MS and native MS; multiple orthogonal structural and biophysical methods in one study\",\n      \"pmids\": [\"29046335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The human CENP-OPQUR complex binds to a joint interface on the CENP-HIKM and CENP-LN complexes to form an 11-subunit CCAN core, which then connects KMN and CENP-A in a reconstituted 26-subunit particle. CENP-P is thus part of the structural bridge between CENP-A chromatin and the microtubule-binding machinery.\",\n      \"method\": \"In vitro reconstitution of recombinant 26-subunit kinetochore particle, biochemical binding assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — full in vitro reconstitution of a 26-subunit kinetochore particle with biochemical validation of connectivity\",\n      \"pmids\": [\"30174292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In budding yeast, the COMA complex (Ctf19/Mcm21/Ame1/Okp1, orthologs of CENP-P/O/U/Q) selectively binds Cse4 (CENP-A) nucleosomes through the Cse4 N-terminus. The Ctf19 C-terminus (CENP-P ortholog C-terminus) interacts with the Sli15/Ipl1 (INCENP/Aurora B) core-CPC in vitro, and deletion of this C-terminus affects chromosome segregation fidelity.\",\n      \"method\": \"In vitro reconstitution of kinetochore complexes guided by crosslinking MS; genetic rescue experiments (tethering Sli15 to Ame1/Okp1 rescues Ctf19 depletion synthetic lethality)\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crosslink-guided in vitro reconstitution plus genetic epistasis rescue experiment, multiple orthogonal methods\",\n      \"pmids\": [\"31112132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CENP-U is recruited to kinetochores by the CENP-P and CENP-Q subunits of the CENP-O complex; CENP-U and Bub1 redundantly recruit Plk1 to kinetochores to stabilize kinetochore-microtubule attachments. The CENP-O complex (unlike its budding yeast homolog) does not regulate centromeric localization of Aurora B in human cells.\",\n      \"method\": \"Stable protein depletion (siRNA/shRNA), immunofluorescence quantification of Plk1 and Aurora B kinetochore levels, chromosome segregation assays, pharmacological inhibition\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal depletion experiments with defined molecular phenotype, pharmacological validation, replicated across conditions\",\n      \"pmids\": [\"34551298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CDK4 occupies the promoter region of the CENPP gene in mouse keratinocytes and regulates its transcription; gain- and loss-of-function experiments demonstrated that CDK4 participates in transcriptional regulation of CENP-P expression.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) followed by RT-qPCR; CDK4 gain- and loss-of-function experiments with CENPP mRNA quantification\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP-qPCR with gain/loss-of-function, single lab, single study\",\n      \"pmids\": [\"34429772\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CENPP (CENP-P) is a constitutively kinetochore-localized subunit of the CENP-O complex (CENP-O/P/Q/R/U), which assembles stepwise during S-phase onto the CCAN through interactions with CENP-L and CENP-K; CENP-P forms an RWD-domain heterodimer with CENP-O (yeast Ctf19-Mcm21) that docks onto CENP-Q (Okp1), thereby positioning the CENP-OPQUR complex at a joint interface of CENP-HIKM and CENP-LN to bridge CENP-A chromatin with the KMN microtubule-binding machinery, and the complex recruits Plk1 to kinetochores (via CENP-U) in parallel with Bub1 to stabilize kinetochore-microtubule attachments and ensure accurate chromosome segregation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CENPP (CENP-P) is a constitutive subunit of the inner-kinetochore CCAN that helps ensure accurate chromosome segregation during mitosis [#0, #1]. It functions within the CENP-O complex (CENP-O/P/Q/U/R), which is not pre-assembled in the cytoplasm but loads stepwise onto kinetochores during S-phase, with CENP-P and CENP-O entering as a heterodimer and the complex docking onto the CCAN largely through interactions with CENP-L and CENP-K [#2, #3]. Structural work in yeast established the molecular basis of this assembly: the CENP-P ortholog (Ctf19) forms an RWD-domain heterodimer with the CENP-O ortholog (Mcm21) that binds a motif in the CENP-Q ortholog (Okp1), positioning this branch of the inner kinetochore [#6]. Within the reconstituted human kinetochore, the CENP-OPQUR module binds a joint interface on the CENP-HIKM and CENP-LN complexes, placing CENP-P in the structural bridge that connects CENP-A chromatin to the KMN microtubule-binding machinery [#7]. Functionally, CENP-P and CENP-Q are required to recruit CENP-U to kinetochores, and CENP-U in turn recruits Plk1 in parallel with Bub1 to stabilize kinetochore-microtubule attachments [#4, #5, #9]; loss of the CENP-O complex removes all its subunits from kinetochores and causes chromosome alignment and segregation errors [#1, #4].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established CENP-P as a bona fide centromere component by placing it within the CENP-A-associated CCAN, defining its cellular address before any mechanism was known.\",\n      \"evidence\": \"Affinity purification/MS, co-IP, and immunofluorescence localization of the CAD/NAC group\",\n      \"pmids\": [\"16622419\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve CENP-P's specific binding partners within the complex\", \"CENP-P was not individually depleted to define its own loss-of-function phenotype\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked the CCAN module containing CENP-P to mitotic fidelity, showing that disruption of the assembly it depends on causes lethal chromosome alignment and segregation errors.\",\n      \"evidence\": \"RNAi knockdown of the CENP-A NAC with mitotic phenotype readout\",\n      \"pmids\": [\"16622419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phenotype attributed to NAC disruption rather than CENP-P depletion specifically\", \"Does not separate CENP-P's contribution from other complex subunits\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined how the CENP-P-containing sub-complex assembles, showing it loads stepwise on kinetochores as CENP-O/P heterodimers rather than as a pre-formed cytoplasmic unit, with CCAN docking via CENP-L and CENP-K.\",\n      \"evidence\": \"F3H, FRET, SNAP-tag, immunostaining, and FRAP in living mammalian cells\",\n      \"pmids\": [\"23028590\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not provide atomic-resolution interface details\", \"Functional consequence of slow exchange dynamics not established\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed CENP-O complex loading temporally in S-phase, identifying a late-S oligomerization maturation step for CENP-Q/CENP-U.\",\n      \"evidence\": \"SNAP-tag pulse-chase and immunostaining\",\n      \"pmids\": [\"23028590\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CENP-P itself undergoes maturation/oligomerization not addressed\", \"Single-lab timing data\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated interdependence within the complex, showing CENP-P is required for CENP-U kinetochore localization and that the subunits stand or fall together for targeting.\",\n      \"evidence\": \"Conditional CENP-U knockout in mouse ES cells with immunofluorescence\",\n      \"pmids\": [\"24481920\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not determine direct vs indirect basis of CENP-P-CENP-U dependence\", \"Single-lab localization assay\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected the CENP-O complex to a signaling output by showing CENP-P/Q recruit CENP-U, which targets Plk1 to kinetochores.\",\n      \"evidence\": \"RNAi depletion with Plk1 kinetochore quantification and congression assays\",\n      \"pmids\": [\"25395579\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CENP-U-Plk1 binding mode not resolved here\", \"Relative contribution of CENP-P vs CENP-Q to recruitment not separated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided the structural mechanism of complex assembly, showing the CENP-P ortholog forms an RWD-domain heterodimer with the CENP-O ortholog that binds the CENP-Q ortholog to configure the inner kinetochore.\",\n      \"evidence\": \"Crystal structure of Ctf19-Mcm21 RWD domains with Okp1 peptide, HDX-MS, native MS (K. lactis)\",\n      \"pmids\": [\"29046335\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure derived from yeast orthologs, not human CENP-P\", \"Human CENP-P structure not solved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Positioned CENP-P architecturally within the human kinetochore, showing the CENP-OPQUR module bridges CENP-HIKM/CENP-LN to connect CENP-A chromatin with KMN.\",\n      \"evidence\": \"In vitro reconstitution of a 26-subunit recombinant kinetochore particle with biochemical binding assays\",\n      \"pmids\": [\"30174292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconstituted system may not capture all in vivo regulation\", \"Microtubule attachment function not directly assayed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed a regulatory function for the CENP-P ortholog C-terminus, linking it to chromosome segregation fidelity via interaction with the Aurora B/CPC core in yeast.\",\n      \"evidence\": \"Crosslink-guided in vitro reconstitution plus genetic rescue/epistasis (S. cerevisiae)\",\n      \"pmids\": [\"31112132\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CPC interaction shown in yeast; human CENP-P-CPC interaction not established\", \"2021 work indicates the human complex does not regulate Aurora B localization, leaving species divergence unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Refined the human signaling model, confirming CENP-P/Q recruit CENP-U and that CENP-U and Bub1 redundantly recruit Plk1 to stabilize attachments, while excluding Aurora B regulation by the human complex.\",\n      \"evidence\": \"siRNA/shRNA depletion, Plk1/Aurora B kinetochore quantification, segregation assays, pharmacological inhibition\",\n      \"pmids\": [\"34551298\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic basis of the species difference in Aurora B regulation not resolved\", \"Direct CENP-P contacts to CENP-U not structurally defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified an upstream transcriptional regulator, showing CDK4 occupies the CENPP promoter and regulates its expression in keratinocytes.\",\n      \"evidence\": \"ChIP-qPCR plus CDK4 gain/loss-of-function with CENPP mRNA readout (mouse)\",\n      \"pmids\": [\"34429772\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-study, single-cell-type observation\", \"Functional consequence of CDK4-driven CENPP expression not established\", \"Direct vs indirect promoter regulation not distinguished\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CENP-P contributes mechanistically to microtubule attachment stability beyond Plk1 recruitment, and whether the yeast CENP-P-CPC interaction has a human counterpart, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No human structural model of CENP-P-containing interfaces resolved at atomic detail\", \"CENP-P-specific (vs whole-complex) loss-of-function phenotype not isolated\", \"Species divergence in Aurora B/CPC regulation unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 6, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 2, 4]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 5, 9]}\n    ],\n    \"complexes\": [\"CENP-O complex (CENP-OPQUR)\", \"CCAN\", \"COMA (yeast ortholog)\"],\n    \"partners\": [\"CENPO\", \"CENPQ\", \"CENPU\", \"CENPR\", \"CENPL\", \"CENPK\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}