MORC3

id: Q14149
gene_symbol: MORC3
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: >-
  MORC3/NXP2 is a nuclear matrix and PML nuclear body-associated MORC-family GHKL/HATPase protein with a CW-type zinc finger
  that reads methylated H3K4. It functions as a SUMO-regulated chromatin/PML-body scaffold and ATPase involved in intrinsic
  antiviral restriction, chromatin-associated repression, recruitment/maintenance of nuclear restriction factors, and negative
  regulation of interferon-beta programs.
existing_annotations:
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: >-
        MORC3 is a nuclear/nuclear-matrix protein and PML nuclear body component.
      action: ACCEPT
      reason: >-
        Nuclear localization is strongly supported, although more specific PML body and nuclear matrix terms should also be
        retained.
      supported_by: &id001
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **SUMO biology and PML nuclear bodies (PML-NBs/ND10).** MORC3 is a **SUMOylated** nuclear matrix/PML nuclear body
            client protein. It associates with PML nuclear bodies through **SUMO–SIM interactions** (SUMO on one partner and
            a SUMO-interacting motif on the other), specifically reported as a SUMO–SIM interaction with **PML isoform I**
            (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15). PML nuclear bodies are SUMO-enriched
            subnuclear condensates and hubs for intrinsic immunity, DNA damage response, transcription regulation, and other
            nuclear processes; MORC3 is one of the SUMO-linked client proteins integrated into these assemblies (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            MORC3 is consistently characterized as a **nuclear matrix protein** that localizes to **PML nuclear bodies**.
            In immunofluorescence microscopy, MORC3 colocalizes with the PML-NB component Sp100 in punctate nuclear structures
            (sloan2016morc3acomponent media 84630a9e). During infection with HSV-1 lacking ICP0, MORC3 is recruited to sites
            associated with incoming viral genomes (identified by ICP4 foci), consistent with a role in intrinsic restriction
            at early stages of infection (sloan2016morc3acomponent media 5b6c97c8).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            Mechanistically, the association with PML-NBs is reported to occur via **SUMO–SIM interaction** with PML.I, and
            PML-NB localization/recruitment functions require a **functional ATPase domain** (sloan2016morc3acomponent pages
            3-5, sloan2016morc3acomponent pages 13-15).
  - term:
      id: GO:0140002
      label: histone H3K4me3 reader activity
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: >-
        The MORC3 CW-type zinc finger is reported to bind methylated H3K4.
      action: ACCEPT
      reason: >-
        Histone H3K4me3 reader activity is consistent with the CW-domain evidence and chromatin-associated function.
      supported_by: &id003
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **Domain architecture and biochemical capabilities.** MORC3 is described as containing three conserved modules:
            (i) a **GHKL/HATPase-like ATPase domain** (a “GHL ATPase”/GHKL-type ATPase in the MORC family), (ii) a **CW-type
            zinc finger** reported to bind **methylated H3K4**, and (iii) a **coiled-coil** region implicated in dimerization/oligomerization
            (sloan2016morc3acomponent pages 3-5). These features fit the concept of MORC proteins as **chromatin-associated
            ATPases** that integrate ATPase-driven conformational changes with chromatin recognition (via CW) and multivalent
            interactions (via coiled-coil) to regulate nuclear substructures and transcriptional states (sloan2016morc3acomponent
            pages 3-5).
  - term:
      id: GO:0140374
      label: antiviral innate immune response
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: >-
        MORC3 contributes to intrinsic antiviral restriction, including PML-body-associated restriction of HSV-1 and HCMV.
      action: ACCEPT
      reason: >-
        Antiviral innate immune response is a supported major function of MORC3.
      supported_by: &id002
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            | PML nuclear bodies / viral restriction | Human MORC3 (NXP2) is a SUMOylated nuclear-matrix protein that localizes
            to PML nuclear bodies via SUMO-SIM interactions with PML.I; its ATPase domain is required for PML-NB localization
            and for recruiting Sp100/p53. During HSV-1 infection, MORC3 is recruited to incoming viral genomes and promotes
            recruitment of intrinsic restriction factors (Sp100, hDaxx, PML, γH2AX). HSV-1 ICP0 counteracts this by degrading
            MORC3. MORC3 also restricts HCMV, although influenza studies indicate virus-specific proviral effects in other
            contexts. (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent
            media 84630a9e) | SILAC/MS proteomics, colocalization microscopy, HSV-1 and HCMV plaque assays, shRNA knockdown,
            viral protein immunoblotting | MORC3 abundance decreased ~5.6-fold during HSV-1 infection in proteomics; MORC3
            depletion caused a marked increase in plaque formation efficiency of ICP0-null HSV-1 and increased HCMV plaque
            formation; MORC3 colocalizes with PML-NB markers in punctate nuclear structures. (sloan2016morc3acomponent pages
            3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent media 84630a9e) | Sloan et al., *J Virol*
            (Oct 2016), DOI: 10.1128/JVI.00621-16, https://doi.org/10.1128/JVI.00621-16 |
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            A notable mechanistic finding is that MORC3 depletion reduced recruitment of multiple factors (Sp100, hDaxx, PML,
            γH2AX) to viral genomes, implying MORC3 participates in building/maintaining a restrictive chromatin environment
            at incoming HSV-1 genomes (sloan2016morc3acomponent pages 3-5).
  - term:
      id: GO:0016605
      label: PML body
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: >-
        MORC3 localizes to PML nuclear bodies through SUMO/SIM-dependent interactions and helps recruit restriction factors
        there.
      action: ACCEPT
      reason: >-
        PML body localization is one of the best-supported cellular component annotations for MORC3.
      supported_by: *id001
  - term:
      id: GO:0006325
      label: chromatin organization
    evidence_type: IEA
    original_reference_id: GO_REF:0000108
    review:
      summary: >-
        MORC3 is a chromatin-associated ATPase/scaffold implicated in epigenetic repression and chromatin organization.
      action: ACCEPT
      reason: >-
        Chromatin organization is supported by conserved MORC3 mechanism and by MORC3-mediated repression of viral/foreign
        DNA and interferon programs.
      supported_by: &id004
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **Domain architecture and biochemical capabilities.** MORC3 is described as containing three conserved modules:
            (i) a **GHKL/HATPase-like ATPase domain** (a “GHL ATPase”/GHKL-type ATPase in the MORC family), (ii) a **CW-type
            zinc finger** reported to bind **methylated H3K4**, and (iii) a **coiled-coil** region implicated in dimerization/oligomerization
            (sloan2016morc3acomponent pages 3-5). These features fit the concept of MORC proteins as **chromatin-associated
            ATPases** that integrate ATPase-driven conformational changes with chromatin recognition (via CW) and multivalent
            interactions (via coiled-coil) to regulate nuclear substructures and transcriptional states (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            | Epigenetic silencing / chromatin regulation | MORC3 is a GHKL ATPase with CW zinc finger and coiled-coil domains;
            ATP binding/hydrolysis and SUMOylation enable interaction with DAXX and promote histone H3.3 deposition at retroelement
            loci, supporting H3K9me3 heterochromatin and silencing. Although shown directly in mouse ES cells, the mechanism
            is highly relevant to human MORC3 because the same domain architecture/function is conserved. (groh2021morc3silencesendogenous
            pages 10-11, groh2021morc3silencesendogenous pages 1-2, groh2020morc3silencesendogenous pages 10-13) | Genome-wide
            sgRNA screen, knockout/rescue mutants, ChIP-seq, ChIP-MS/IP-MS, ATAC-seq, H3.3 ChIP-qPCR, RT-qPCR | 2,737 reproducible
            Morc3 ChIP peaks; Morc3 loss increased chromatin accessibility at 444 peaks and decreased it at 10 peaks; ChIP-MS
            identified 489 Morc3-associated proteins; ATPase-cycle mutants failed to rescue ERV silencing. (groh2020morc3silencesendogenous
            pages 7-10, groh2021morc3silencesendogenous pages 1-2, groh2020morc3silencesendogenous pages 10-13) | Groh et
            al., *Nat Commun* (Oct 2021), DOI: 10.1038/s41467-021-26288-7, https://doi.org/10.1038/s41467-021-26288-7 |
  - term:
      id: GO:0002376
      label: immune system process
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: >-
        MORC3 has immune functions, but the evidence supports the more specific antiviral innate immune response and interferon-beta
        regulatory terms.
      action: MODIFY
      reason: >-
        Use antiviral innate immune response rather than the broad parent immune system process.
      proposed_replacement_terms:
        - id: GO:0140374
          label: antiviral innate immune response
      supported_by: *id002
  - term:
      id: GO:0003723
      label: RNA binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: >-
        The curated MORC3 literature supports ATPase, CW histone-reader, chromatin/PML-body scaffold, and antiviral restriction
        roles, not direct RNA binding.
      action: REMOVE
      reason: >-
        This electronically inferred RNA-binding annotation is not supported by the gene-specific functional synthesis.
      supported_by: *id003
  - term:
      id: GO:0005654
      label: nucleoplasm
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: >-
        MORC3 is nuclear, but the more specific supported locations are PML bodies and nuclear matrix/chromatin-associated
        nuclear structures.
      action: MODIFY
      reason: >-
        Use PML body and nuclear matrix instead of broad nucleoplasm when curating MORC3 localization.
      proposed_replacement_terms:
        - id: GO:0016605
          label: PML body
        - id: GO:0016363
          label: nuclear matrix
      supported_by: *id001
  - term:
      id: GO:0005694
      label: chromosome
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: >-
        MORC3 is chromatin-associated, but chromosome is a broad location for this evidence.
      action: MODIFY
      reason: >-
        Use chromatin to represent the supported chromosome-associated localization/function more precisely.
      proposed_replacement_terms:
        - id: GO:0000785
          label: chromatin
      supported_by: *id004
  - term:
      id: GO:0008270
      label: zinc ion binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: >-
        MORC3 contains a CW-type zinc finger domain.
      action: ACCEPT
      reason: >-
        Zinc ion binding is supported by the CW zinc-finger domain architecture.
      supported_by: *id003
  - term:
      id: GO:0016363
      label: nuclear matrix
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: >-
        MORC3/NXP2 is consistently characterized as a nuclear matrix protein.
      action: ACCEPT
      reason: >-
        Nuclear matrix localization is supported by the literature synthesis.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            MORC3 is consistently characterized as a **nuclear matrix protein** that localizes to **PML nuclear bodies**.
            In immunofluorescence microscopy, MORC3 colocalizes with the PML-NB component Sp100 in punctate nuclear structures
            (sloan2016morc3acomponent media 84630a9e). During infection with HSV-1 lacking ICP0, MORC3 is recruited to sites
            associated with incoming viral genomes (identified by ICP4 foci), consistent with a role in intrinsic restriction
            at early stages of infection (sloan2016morc3acomponent media 5b6c97c8).
  - term:
      id: GO:0016605
      label: PML body
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: >-
        MORC3 localizes to PML nuclear bodies through SUMO/SIM-dependent interactions and helps recruit restriction factors
        there.
      action: ACCEPT
      reason: >-
        PML body localization is one of the best-supported cellular component annotations for MORC3.
      supported_by: *id001
  - term:
      id: GO:0016887
      label: ATP hydrolysis activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: >-
        MORC3 is a MORC-family GHKL/HATPase ATPase, and ATPase activity is required for PML-body localization/recruitment
        functions.
      action: ACCEPT
      reason: >-
        ATP hydrolysis activity is a core molecular feature of MORC3.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **Domain architecture and biochemical capabilities.** MORC3 is described as containing three conserved modules:
            (i) a **GHKL/HATPase-like ATPase domain** (a “GHL ATPase”/GHKL-type ATPase in the MORC family), (ii) a **CW-type
            zinc finger** reported to bind **methylated H3K4**, and (iii) a **coiled-coil** region implicated in dimerization/oligomerization
            (sloan2016morc3acomponent pages 3-5). These features fit the concept of MORC proteins as **chromatin-associated
            ATPases** that integrate ATPase-driven conformational changes with chromatin recognition (via CW) and multivalent
            interactions (via coiled-coil) to regulate nuclear substructures and transcriptional states (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            Mechanistically, the association with PML-NBs is reported to occur via **SUMO–SIM interaction** with PML.I, and
            PML-NB localization/recruitment functions require a **functional ATPase domain** (sloan2016morc3acomponent pages
            3-5, sloan2016morc3acomponent pages 13-15).
  - term:
      id: GO:0045087
      label: innate immune response
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: >-
        MORC3 participates in innate immunity, but the evidence is specifically antiviral restriction and interferon regulation.
      action: MODIFY
      reason: >-
        Use antiviral innate immune response for the supported immune role.
      proposed_replacement_terms:
        - id: GO:0140374
          label: antiviral innate immune response
      supported_by: *id002
  - term:
      id: GO:0046872
      label: metal ion binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: >-
        MORC3 metal binding is specifically attributable to its CW-type zinc finger.
      action: MODIFY
      reason: >-
        Use zinc ion binding rather than generic metal ion binding.
      proposed_replacement_terms:
        - id: GO:0008270
          label: zinc ion binding
      supported_by: *id003
  - term:
      id: GO:0140002
      label: histone H3K4me3 reader activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: >-
        The MORC3 CW-type zinc finger is reported to bind methylated H3K4.
      action: ACCEPT
      reason: >-
        Histone H3K4me3 reader activity is consistent with the CW-domain evidence and chromatin-associated function.
      supported_by: *id003
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:26496610
    review:
      summary: >-
        MORC3 has many protein partners in PML body, SUMO, chromatin, and interactome datasets, but generic protein binding
        is not informative.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        The actionable biology is better represented by protein-macromolecule adaptor activity, PML body localization, chromatin
        organization, and antiviral restriction.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **SUMO biology and PML nuclear bodies (PML-NBs/ND10).** MORC3 is a **SUMOylated** nuclear matrix/PML nuclear body
            client protein. It associates with PML nuclear bodies through **SUMO–SIM interactions** (SUMO on one partner and
            a SUMO-interacting motif on the other), specifically reported as a SUMO–SIM interaction with **PML isoform I**
            (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15). PML nuclear bodies are SUMO-enriched
            subnuclear condensates and hubs for intrinsic immunity, DNA damage response, transcription regulation, and other
            nuclear processes; MORC3 is one of the SUMO-linked client proteins integrated into these assemblies (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            A notable mechanistic finding is that MORC3 depletion reduced recruitment of multiple factors (Sp100, hDaxx, PML,
            γH2AX) to viral genomes, implying MORC3 participates in building/maintaining a restrictive chromatin environment
            at incoming HSV-1 genomes (sloan2016morc3acomponent pages 3-5).
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:27173435
    review:
      summary: >-
        MORC3 has many protein partners in PML body, SUMO, chromatin, and interactome datasets, but generic protein binding
        is not informative.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        The actionable biology is better represented by protein-macromolecule adaptor activity, PML body localization, chromatin
        organization, and antiviral restriction.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **SUMO biology and PML nuclear bodies (PML-NBs/ND10).** MORC3 is a **SUMOylated** nuclear matrix/PML nuclear body
            client protein. It associates with PML nuclear bodies through **SUMO–SIM interactions** (SUMO on one partner and
            a SUMO-interacting motif on the other), specifically reported as a SUMO–SIM interaction with **PML isoform I**
            (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15). PML nuclear bodies are SUMO-enriched
            subnuclear condensates and hubs for intrinsic immunity, DNA damage response, transcription regulation, and other
            nuclear processes; MORC3 is one of the SUMO-linked client proteins integrated into these assemblies (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            A notable mechanistic finding is that MORC3 depletion reduced recruitment of multiple factors (Sp100, hDaxx, PML,
            γH2AX) to viral genomes, implying MORC3 participates in building/maintaining a restrictive chromatin environment
            at incoming HSV-1 genomes (sloan2016morc3acomponent pages 3-5).
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:32296183
    review:
      summary: >-
        MORC3 has many protein partners in PML body, SUMO, chromatin, and interactome datasets, but generic protein binding
        is not informative.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        The actionable biology is better represented by protein-macromolecule adaptor activity, PML body localization, chromatin
        organization, and antiviral restriction.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **SUMO biology and PML nuclear bodies (PML-NBs/ND10).** MORC3 is a **SUMOylated** nuclear matrix/PML nuclear body
            client protein. It associates with PML nuclear bodies through **SUMO–SIM interactions** (SUMO on one partner and
            a SUMO-interacting motif on the other), specifically reported as a SUMO–SIM interaction with **PML isoform I**
            (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15). PML nuclear bodies are SUMO-enriched
            subnuclear condensates and hubs for intrinsic immunity, DNA damage response, transcription regulation, and other
            nuclear processes; MORC3 is one of the SUMO-linked client proteins integrated into these assemblies (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            A notable mechanistic finding is that MORC3 depletion reduced recruitment of multiple factors (Sp100, hDaxx, PML,
            γH2AX) to viral genomes, implying MORC3 participates in building/maintaining a restrictive chromatin environment
            at incoming HSV-1 genomes (sloan2016morc3acomponent pages 3-5).
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:33961781
    review:
      summary: >-
        MORC3 has many protein partners in PML body, SUMO, chromatin, and interactome datasets, but generic protein binding
        is not informative.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        The actionable biology is better represented by protein-macromolecule adaptor activity, PML body localization, chromatin
        organization, and antiviral restriction.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **SUMO biology and PML nuclear bodies (PML-NBs/ND10).** MORC3 is a **SUMOylated** nuclear matrix/PML nuclear body
            client protein. It associates with PML nuclear bodies through **SUMO–SIM interactions** (SUMO on one partner and
            a SUMO-interacting motif on the other), specifically reported as a SUMO–SIM interaction with **PML isoform I**
            (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15). PML nuclear bodies are SUMO-enriched
            subnuclear condensates and hubs for intrinsic immunity, DNA damage response, transcription regulation, and other
            nuclear processes; MORC3 is one of the SUMO-linked client proteins integrated into these assemblies (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            A notable mechanistic finding is that MORC3 depletion reduced recruitment of multiple factors (Sp100, hDaxx, PML,
            γH2AX) to viral genomes, implying MORC3 participates in building/maintaining a restrictive chromatin environment
            at incoming HSV-1 genomes (sloan2016morc3acomponent pages 3-5).
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:35271311
    review:
      summary: >-
        MORC3 has many protein partners in PML body, SUMO, chromatin, and interactome datasets, but generic protein binding
        is not informative.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        The actionable biology is better represented by protein-macromolecule adaptor activity, PML body localization, chromatin
        organization, and antiviral restriction.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **SUMO biology and PML nuclear bodies (PML-NBs/ND10).** MORC3 is a **SUMOylated** nuclear matrix/PML nuclear body
            client protein. It associates with PML nuclear bodies through **SUMO–SIM interactions** (SUMO on one partner and
            a SUMO-interacting motif on the other), specifically reported as a SUMO–SIM interaction with **PML isoform I**
            (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15). PML nuclear bodies are SUMO-enriched
            subnuclear condensates and hubs for intrinsic immunity, DNA damage response, transcription regulation, and other
            nuclear processes; MORC3 is one of the SUMO-linked client proteins integrated into these assemblies (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            A notable mechanistic finding is that MORC3 depletion reduced recruitment of multiple factors (Sp100, hDaxx, PML,
            γH2AX) to viral genomes, implying MORC3 participates in building/maintaining a restrictive chromatin environment
            at incoming HSV-1 genomes (sloan2016morc3acomponent pages 3-5).
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:35914814
    review:
      summary: >-
        MORC3 has many protein partners in PML body, SUMO, chromatin, and interactome datasets, but generic protein binding
        is not informative.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        The actionable biology is better represented by protein-macromolecule adaptor activity, PML body localization, chromatin
        organization, and antiviral restriction.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **SUMO biology and PML nuclear bodies (PML-NBs/ND10).** MORC3 is a **SUMOylated** nuclear matrix/PML nuclear body
            client protein. It associates with PML nuclear bodies through **SUMO–SIM interactions** (SUMO on one partner and
            a SUMO-interacting motif on the other), specifically reported as a SUMO–SIM interaction with **PML isoform I**
            (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15). PML nuclear bodies are SUMO-enriched
            subnuclear condensates and hubs for intrinsic immunity, DNA damage response, transcription regulation, and other
            nuclear processes; MORC3 is one of the SUMO-linked client proteins integrated into these assemblies (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            A notable mechanistic finding is that MORC3 depletion reduced recruitment of multiple factors (Sp100, hDaxx, PML,
            γH2AX) to viral genomes, implying MORC3 participates in building/maintaining a restrictive chromatin environment
            at incoming HSV-1 genomes (sloan2016morc3acomponent pages 3-5).
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:40205054
    review:
      summary: >-
        MORC3 has many protein partners in PML body, SUMO, chromatin, and interactome datasets, but generic protein binding
        is not informative.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        The actionable biology is better represented by protein-macromolecule adaptor activity, PML body localization, chromatin
        organization, and antiviral restriction.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **SUMO biology and PML nuclear bodies (PML-NBs/ND10).** MORC3 is a **SUMOylated** nuclear matrix/PML nuclear body
            client protein. It associates with PML nuclear bodies through **SUMO–SIM interactions** (SUMO on one partner and
            a SUMO-interacting motif on the other), specifically reported as a SUMO–SIM interaction with **PML isoform I**
            (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15). PML nuclear bodies are SUMO-enriched
            subnuclear condensates and hubs for intrinsic immunity, DNA damage response, transcription regulation, and other
            nuclear processes; MORC3 is one of the SUMO-linked client proteins integrated into these assemblies (sloan2016morc3acomponent
            pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            A notable mechanistic finding is that MORC3 depletion reduced recruitment of multiple factors (Sp100, hDaxx, PML,
            γH2AX) to viral genomes, implying MORC3 participates in building/maintaining a restrictive chromatin environment
            at incoming HSV-1 genomes (sloan2016morc3acomponent pages 3-5).
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: >-
        MORC3 is a nuclear/nuclear-matrix protein and PML nuclear body component.
      action: ACCEPT
      reason: >-
        Nuclear localization is strongly supported, although more specific PML body and nuclear matrix terms should also be
        retained.
      supported_by: *id001
  - term:
      id: GO:0005654
      label: nucleoplasm
    evidence_type: IDA
    original_reference_id: GO_REF:0000052
    review:
      summary: >-
        MORC3 is nuclear, but the more specific supported locations are PML bodies and nuclear matrix/chromatin-associated
        nuclear structures.
      action: MODIFY
      reason: >-
        Use PML body and nuclear matrix instead of broad nucleoplasm when curating MORC3 localization.
      proposed_replacement_terms:
        - id: GO:0016605
          label: PML body
        - id: GO:0016363
          label: nuclear matrix
      supported_by: *id001
  - term:
      id: GO:0140002
      label: histone H3K4me3 reader activity
    evidence_type: IDA
    original_reference_id: PMID:26933034
    review:
      summary: >-
        The MORC3 CW-type zinc finger is reported to bind methylated H3K4.
      action: ACCEPT
      reason: >-
        Histone H3K4me3 reader activity is consistent with the CW-domain evidence and chromatin-associated function.
      supported_by: *id003
  - term:
      id: GO:0000122
      label: negative regulation of transcription by RNA polymerase II
    evidence_type: IDA
    original_reference_id: PMID:34759314
    review:
      summary: >-
        MORC3 contributes to repression of transcriptional programs, including IFNB1/interferon-linked gene regulation and
        foreign DNA silencing.
      action: ACCEPT
      reason: >-
        Negative regulation of RNA polymerase II transcription is consistent with the MORC3 chromatin repression evidence.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **Intrinsic immunity and interferon pathway modulation.** In OSCC/HNSCC models, MORC3 knockdown upregulated interferon-associated
            genes and increased STAT1 and PD-L1, suggesting MORC3 suppresses interferon-driven transcriptional programs in
            this context (fu2024genomewideanalysisreveals pages 3-7). In myositis/cancer-associated myositis literature, MORC3
            is described as an antiviral factor and a repressor of IFNB1 (patasova2023geneticinfluencesin pages 6-8). Together,
            these suggest MORC3 contributes to a chromatin-based brake on interferon gene expression, with context-dependent
            consequences (antiviral restriction in fibroblast/hepatocyte models vs immune evasion phenotypes in cancer).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            | Epigenetic silencing / chromatin regulation | MORC3 is a GHKL ATPase with CW zinc finger and coiled-coil domains;
            ATP binding/hydrolysis and SUMOylation enable interaction with DAXX and promote histone H3.3 deposition at retroelement
            loci, supporting H3K9me3 heterochromatin and silencing. Although shown directly in mouse ES cells, the mechanism
            is highly relevant to human MORC3 because the same domain architecture/function is conserved. (groh2021morc3silencesendogenous
            pages 10-11, groh2021morc3silencesendogenous pages 1-2, groh2020morc3silencesendogenous pages 10-13) | Genome-wide
            sgRNA screen, knockout/rescue mutants, ChIP-seq, ChIP-MS/IP-MS, ATAC-seq, H3.3 ChIP-qPCR, RT-qPCR | 2,737 reproducible
            Morc3 ChIP peaks; Morc3 loss increased chromatin accessibility at 444 peaks and decreased it at 10 peaks; ChIP-MS
            identified 489 Morc3-associated proteins; ATPase-cycle mutants failed to rescue ERV silencing. (groh2020morc3silencesendogenous
            pages 7-10, groh2021morc3silencesendogenous pages 1-2, groh2020morc3silencesendogenous pages 10-13) | Groh et
            al., *Nat Commun* (Oct 2021), DOI: 10.1038/s41467-021-26288-7, https://doi.org/10.1038/s41467-021-26288-7 |
  - term:
      id: GO:0000785
      label: chromatin
    evidence_type: IDA
    original_reference_id: PMID:34759314
    review:
      summary: >-
        MORC3 is a chromatin-associated ATPase/scaffold with roles in repressive chromatin states.
      action: ACCEPT
      reason: >-
        Chromatin localization/function is supported by the mechanistic synthesis.
      supported_by: *id004
  - term:
      id: GO:0003677
      label: DNA binding
    evidence_type: IDA
    original_reference_id: PMID:34759314
    review:
      summary: >-
        MORC3 regulates chromatin/DNA elements, but available synthesized evidence supports chromatin association and MRE
        regulation rather than a clearly separable direct DNA-binding MF.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        Curate the supported chromatin and transcription-regulatory roles instead of broad DNA binding unless direct DNA-binding
        evidence is reviewed in detail.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **Intrinsic immunity and interferon pathway modulation.** In OSCC/HNSCC models, MORC3 knockdown upregulated interferon-associated
            genes and increased STAT1 and PD-L1, suggesting MORC3 suppresses interferon-driven transcriptional programs in
            this context (fu2024genomewideanalysisreveals pages 3-7). In myositis/cancer-associated myositis literature, MORC3
            is described as an antiviral factor and a repressor of IFNB1 (patasova2023geneticinfluencesin pages 6-8). Together,
            these suggest MORC3 contributes to a chromatin-based brake on interferon gene expression, with context-dependent
            consequences (antiviral restriction in fibroblast/hepatocyte models vs immune evasion phenotypes in cancer).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            | Epigenetic silencing / chromatin regulation | MORC3 is a GHKL ATPase with CW zinc finger and coiled-coil domains;
            ATP binding/hydrolysis and SUMOylation enable interaction with DAXX and promote histone H3.3 deposition at retroelement
            loci, supporting H3K9me3 heterochromatin and silencing. Although shown directly in mouse ES cells, the mechanism
            is highly relevant to human MORC3 because the same domain architecture/function is conserved. (groh2021morc3silencesendogenous
            pages 10-11, groh2021morc3silencesendogenous pages 1-2, groh2020morc3silencesendogenous pages 10-13) | Genome-wide
            sgRNA screen, knockout/rescue mutants, ChIP-seq, ChIP-MS/IP-MS, ATAC-seq, H3.3 ChIP-qPCR, RT-qPCR | 2,737 reproducible
            Morc3 ChIP peaks; Morc3 loss increased chromatin accessibility at 444 peaks and decreased it at 10 peaks; ChIP-MS
            identified 489 Morc3-associated proteins; ATPase-cycle mutants failed to rescue ERV silencing. (groh2020morc3silencesendogenous
            pages 7-10, groh2021morc3silencesendogenous pages 1-2, groh2020morc3silencesendogenous pages 10-13) | Groh et
            al., *Nat Commun* (Oct 2021), DOI: 10.1038/s41467-021-26288-7, https://doi.org/10.1038/s41467-021-26288-7 |
  - term:
      id: GO:0016605
      label: PML body
    evidence_type: IDA
    original_reference_id: PMID:27440897
    review:
      summary: >-
        MORC3 localizes to PML nuclear bodies through SUMO/SIM-dependent interactions and helps recruit restriction factors
        there.
      action: ACCEPT
      reason: >-
        PML body localization is one of the best-supported cellular component annotations for MORC3.
      supported_by: *id001
  - term:
      id: GO:0030674
      label: protein-macromolecule adaptor activity
    evidence_type: IDA
    original_reference_id: PMID:27440897
    review:
      summary: >-
        MORC3 functions as a SUMO-regulated scaffold/adaptor for PML-body and viral-genome-associated restriction factors.
      action: ACCEPT
      reason: >-
        Protein-macromolecule adaptor activity is supported by MORC3-dependent recruitment of PML, Sp100, hDaxx, gamma-H2AX,
        p53, and related nuclear factors.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            A notable mechanistic finding is that MORC3 depletion reduced recruitment of multiple factors (Sp100, hDaxx, PML,
            γH2AX) to viral genomes, implying MORC3 participates in building/maintaining a restrictive chromatin environment
            at incoming HSV-1 genomes (sloan2016morc3acomponent pages 3-5).
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            | PML nuclear bodies / viral restriction | Human MORC3 (NXP2) is a SUMOylated nuclear-matrix protein that localizes
            to PML nuclear bodies via SUMO-SIM interactions with PML.I; its ATPase domain is required for PML-NB localization
            and for recruiting Sp100/p53. During HSV-1 infection, MORC3 is recruited to incoming viral genomes and promotes
            recruitment of intrinsic restriction factors (Sp100, hDaxx, PML, γH2AX). HSV-1 ICP0 counteracts this by degrading
            MORC3. MORC3 also restricts HCMV, although influenza studies indicate virus-specific proviral effects in other
            contexts. (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent
            media 84630a9e) | SILAC/MS proteomics, colocalization microscopy, HSV-1 and HCMV plaque assays, shRNA knockdown,
            viral protein immunoblotting | MORC3 abundance decreased ~5.6-fold during HSV-1 infection in proteomics; MORC3
            depletion caused a marked increase in plaque formation efficiency of ICP0-null HSV-1 and increased HCMV plaque
            formation; MORC3 colocalizes with PML-NB markers in punctate nuclear structures. (sloan2016morc3acomponent pages
            3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent media 84630a9e) | Sloan et al., *J Virol*
            (Oct 2016), DOI: 10.1128/JVI.00621-16, https://doi.org/10.1128/JVI.00621-16 |
  - term:
      id: GO:0032688
      label: negative regulation of interferon-beta production
    evidence_type: IDA
    original_reference_id: PMID:34759314
    review:
      summary: >-
        Loss or degradation of MORC3 derepresses IFNB1/interferon programs, supporting a negative regulatory role.
      action: ACCEPT
      reason: >-
        Negative regulation of interferon-beta production is directly aligned with MORC3-mediated IFNB1 repression.
      supported_by:
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **Intrinsic immunity and interferon pathway modulation.** In OSCC/HNSCC models, MORC3 knockdown upregulated interferon-associated
            genes and increased STAT1 and PD-L1, suggesting MORC3 suppresses interferon-driven transcriptional programs in
            this context (fu2024genomewideanalysisreveals pages 3-7). In myositis/cancer-associated myositis literature, MORC3
            is described as an antiviral factor and a repressor of IFNB1 (patasova2023geneticinfluencesin pages 6-8). Together,
            these suggest MORC3 contributes to a chromatin-based brake on interferon gene expression, with context-dependent
            consequences (antiviral restriction in fibroblast/hepatocyte models vs immune evasion phenotypes in cancer).
  - term:
      id: GO:0140374
      label: antiviral innate immune response
    evidence_type: IDA
    original_reference_id: PMID:27440897
    review:
      summary: >-
        MORC3 contributes to intrinsic antiviral restriction, including PML-body-associated restriction of HSV-1 and HCMV.
      action: ACCEPT
      reason: >-
        Antiviral innate immune response is a supported major function of MORC3.
      supported_by: *id002
  - term:
      id: GO:2000774
      label: positive regulation of cellular senescence
    evidence_type: IDA
    original_reference_id: PMID:17332504
    review:
      summary: >-
        MORC3 can activate p53 and induce cellular senescence in fibroblast models.
      action: KEEP_AS_NON_CORE
      reason: >-
        The p53/senescence phenotype is supported but is a downstream context-specific outcome of MORC3 PML-body localization
        and scaffold activity rather than the core conserved function.
      supported_by: &id006
        - reference_id: PMID:17332504
          supporting_text: >-
            Dynamic regulation of p53 subnuclear localization and senescence by MORC3.
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            | PML nuclear bodies / viral restriction | Human MORC3 (NXP2) is a SUMOylated nuclear-matrix protein that localizes
            to PML nuclear bodies via SUMO-SIM interactions with PML.I; its ATPase domain is required for PML-NB localization
            and for recruiting Sp100/p53. During HSV-1 infection, MORC3 is recruited to incoming viral genomes and promotes
            recruitment of intrinsic restriction factors (Sp100, hDaxx, PML, γH2AX). HSV-1 ICP0 counteracts this by degrading
            MORC3. MORC3 also restricts HCMV, although influenza studies indicate virus-specific proviral effects in other
            contexts. (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent
            media 84630a9e) | SILAC/MS proteomics, colocalization microscopy, HSV-1 and HCMV plaque assays, shRNA knockdown,
            viral protein immunoblotting | MORC3 abundance decreased ~5.6-fold during HSV-1 infection in proteomics; MORC3
            depletion caused a marked increase in plaque formation efficiency of ICP0-null HSV-1 and increased HCMV plaque
            formation; MORC3 colocalizes with PML-NB markers in punctate nuclear structures. (sloan2016morc3acomponent pages
            3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent media 84630a9e) | Sloan et al., *J Virol*
            (Oct 2016), DOI: 10.1128/JVI.00621-16, https://doi.org/10.1128/JVI.00621-16 |
  - term:
      id: GO:0006468
      label: protein phosphorylation
    evidence_type: IDA
    original_reference_id: PMID:17332504
    review:
      summary: >-
        MORC3 is a GHKL ATPase, not a protein kinase; the p53 study states that genotoxic stress-induced p53 phosphorylation
        still occurs in Morc3-deficient fibroblasts.
      action: REMOVE
      reason: >-
        This annotation misattributes phosphorylation catalysis to MORC3. MORC3 regulates p53 localization/activity downstream
        of phosphorylation through PML nuclear bodies.
      supported_by: &id005
        - reference_id: PMID:17332504
          supporting_text: >-
            phosphorylation and stabilization of p53 but barely increased its
        - reference_id: PMID:17332504
          supporting_text: >-
            Dynamic regulation of p53 subnuclear localization and senescence by MORC3.
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            **Domain architecture and biochemical capabilities.** MORC3 is described as containing three conserved modules:
            (i) a **GHKL/HATPase-like ATPase domain** (a “GHL ATPase”/GHKL-type ATPase in the MORC family), (ii) a **CW-type
            zinc finger** reported to bind **methylated H3K4**, and (iii) a **coiled-coil** region implicated in dimerization/oligomerization
            (sloan2016morc3acomponent pages 3-5). These features fit the concept of MORC proteins as **chromatin-associated
            ATPases** that integrate ATPase-driven conformational changes with chromatin recognition (via CW) and multivalent
            interactions (via coiled-coil) to regulate nuclear substructures and transcriptional states (sloan2016morc3acomponent
            pages 3-5).
  - term:
      id: GO:0016605
      label: PML body
    evidence_type: IDA
    original_reference_id: PMID:17332504
    review:
      summary: >-
        MORC3 localizes to PML nuclear bodies through SUMO/SIM-dependent interactions and helps recruit restriction factors
        there.
      action: ACCEPT
      reason: >-
        PML body localization is one of the best-supported cellular component annotations for MORC3.
      supported_by: *id001
  - term:
      id: GO:0018105
      label: peptidyl-serine phosphorylation
    evidence_type: IDA
    original_reference_id: PMID:17332504
    review:
      summary: >-
        MORC3 is not a serine/threonine kinase, and the p53 paper supports a localization/activity role rather than peptidyl-serine
        phosphorylation by MORC3.
      action: REMOVE
      reason: >-
        The annotation incorrectly converts a p53 phosphorylation phenotype into MORC3 kinase activity.
      supported_by: *id005
  - term:
      id: GO:0048147
      label: negative regulation of fibroblast proliferation
    evidence_type: IDA
    original_reference_id: PMID:17332504
    review:
      summary: >-
        MORC3-dependent p53 activation and cellular senescence in fibroblast models imply reduced fibroblast proliferation.
      action: KEEP_AS_NON_CORE
      reason: >-
        This is a supported context-specific p53/senescence phenotype rather than a core MORC3 molecular function.
      supported_by: *id006
  - term:
      id: GO:0050821
      label: protein stabilization
    evidence_type: IDA
    original_reference_id: PMID:17332504
    review:
      summary: >-
        The p53 study indicates that genotoxic stress-induced p53 stabilization still occurs in Morc3-deficient fibroblasts;
        MORC3 instead affects p53 localization and transcriptional activity.
      action: REMOVE
      reason: >-
        Protein stabilization is not the supported MORC3 activity from this evidence.
      supported_by:
        - reference_id: PMID:17332504
          supporting_text: >-
            phosphorylation and stabilization of p53 but barely increased its
        - reference_id: PMID:17332504
          supporting_text: >-
            Dynamic regulation of p53 subnuclear localization and senescence by MORC3.
  - term:
      id: GO:0051457
      label: maintenance of protein location in nucleus
    evidence_type: IDA
    original_reference_id: PMID:17332504
    review:
      summary: >-
        MORC3 helps recruit/maintain p53, Sp100, and viral-genome-associated restriction factors in nuclear PML-body contexts.
      action: KEEP_AS_NON_CORE
      reason: >-
        Maintenance of nuclear protein location is supported as a scaffold/localization role, but is secondary to the core
        PML-body chromatin-adaptor function.
      supported_by:
        - reference_id: PMID:17332504
          supporting_text: >-
            Dynamic regulation of p53 subnuclear localization and senescence by MORC3.
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            | PML nuclear bodies / viral restriction | Human MORC3 (NXP2) is a SUMOylated nuclear-matrix protein that localizes
            to PML nuclear bodies via SUMO-SIM interactions with PML.I; its ATPase domain is required for PML-NB localization
            and for recruiting Sp100/p53. During HSV-1 infection, MORC3 is recruited to incoming viral genomes and promotes
            recruitment of intrinsic restriction factors (Sp100, hDaxx, PML, γH2AX). HSV-1 ICP0 counteracts this by degrading
            MORC3. MORC3 also restricts HCMV, although influenza studies indicate virus-specific proviral effects in other
            contexts. (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent
            media 84630a9e) | SILAC/MS proteomics, colocalization microscopy, HSV-1 and HCMV plaque assays, shRNA knockdown,
            viral protein immunoblotting | MORC3 abundance decreased ~5.6-fold during HSV-1 infection in proteomics; MORC3
            depletion caused a marked increase in plaque formation efficiency of ICP0-null HSV-1 and increased HCMV plaque
            formation; MORC3 colocalizes with PML-NB markers in punctate nuclear structures. (sloan2016morc3acomponent pages
            3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent media 84630a9e) | Sloan et al., *J Virol*
            (Oct 2016), DOI: 10.1128/JVI.00621-16, https://doi.org/10.1128/JVI.00621-16 |
  - term:
      id: GO:0051457
      label: maintenance of protein location in nucleus
    evidence_type: IMP
    original_reference_id: PMID:17332504
    review:
      summary: >-
        MORC3 helps recruit/maintain p53, Sp100, and viral-genome-associated restriction factors in nuclear PML-body contexts.
      action: KEEP_AS_NON_CORE
      reason: >-
        Maintenance of nuclear protein location is supported as a scaffold/localization role, but is secondary to the core
        PML-body chromatin-adaptor function.
      supported_by:
        - reference_id: PMID:17332504
          supporting_text: >-
            Dynamic regulation of p53 subnuclear localization and senescence by MORC3.
        - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
          supporting_text: >-
            | PML nuclear bodies / viral restriction | Human MORC3 (NXP2) is a SUMOylated nuclear-matrix protein that localizes
            to PML nuclear bodies via SUMO-SIM interactions with PML.I; its ATPase domain is required for PML-NB localization
            and for recruiting Sp100/p53. During HSV-1 infection, MORC3 is recruited to incoming viral genomes and promotes
            recruitment of intrinsic restriction factors (Sp100, hDaxx, PML, γH2AX). HSV-1 ICP0 counteracts this by degrading
            MORC3. MORC3 also restricts HCMV, although influenza studies indicate virus-specific proviral effects in other
            contexts. (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent
            media 84630a9e) | SILAC/MS proteomics, colocalization microscopy, HSV-1 and HCMV plaque assays, shRNA knockdown,
            viral protein immunoblotting | MORC3 abundance decreased ~5.6-fold during HSV-1 infection in proteomics; MORC3
            depletion caused a marked increase in plaque formation efficiency of ICP0-null HSV-1 and increased HCMV plaque
            formation; MORC3 colocalizes with PML-NB markers in punctate nuclear structures. (sloan2016morc3acomponent pages
            3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent media 84630a9e) | Sloan et al., *J Virol*
            (Oct 2016), DOI: 10.1128/JVI.00621-16, https://doi.org/10.1128/JVI.00621-16 |
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    findings: []
  - id: PMID:40205054
    title: Multimodal cell maps as a foundation for structural and functional genomics.
    findings: []
  - id: file:human/MORC3/MORC3-deep-research-falcon.md
    title: Falcon deep research on MORC3 function
    findings:
      - statement: MORC3 is a nuclear matrix and PML nuclear body protein with GHKL ATPase and CW zinc-finger domains.
      - statement: MORC3 contributes to PML nuclear body-associated intrinsic antiviral restriction of HSV-1 and HCMV.
      - statement: MORC3 acts as a chromatin-associated ATPase/scaffold involved in epigenetic repression and interferon
          program regulation.
core_functions:
  - molecular_function:
      id: GO:0016887
      label: ATP hydrolysis activity
    description: >-
      MORC3 is a MORC-family GHKL/HATPase chromatin-associated ATPase. Its ATPase cycle works with its CW zinc-finger chromatin-reader
      module and SUMOylation to support repressive chromatin organization at foreign or deleterious DNA templates.
    directly_involved_in:
      - id: GO:0006325
        label: chromatin organization
      - id: GO:0000122
        label: negative regulation of transcription by RNA polymerase II
    locations:
      - id: GO:0000785
        label: chromatin
      - id: GO:0016363
        label: nuclear matrix
      - id: GO:0005634
        label: nucleus
    supported_by:
      - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
        supporting_text: >-
          **Domain architecture and biochemical capabilities.** MORC3 is described as containing three conserved modules:
          (i) a **GHKL/HATPase-like ATPase domain** (a “GHL ATPase”/GHKL-type ATPase in the MORC family), (ii) a **CW-type
          zinc finger** reported to bind **methylated H3K4**, and (iii) a **coiled-coil** region implicated in dimerization/oligomerization
          (sloan2016morc3acomponent pages 3-5). These features fit the concept of MORC proteins as **chromatin-associated
          ATPases** that integrate ATPase-driven conformational changes with chromatin recognition (via CW) and multivalent
          interactions (via coiled-coil) to regulate nuclear substructures and transcriptional states (sloan2016morc3acomponent
          pages 3-5).
      - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
        supporting_text: >-
          | Epigenetic silencing / chromatin regulation | MORC3 is a GHKL ATPase with CW zinc finger and coiled-coil domains;
          ATP binding/hydrolysis and SUMOylation enable interaction with DAXX and promote histone H3.3 deposition at retroelement
          loci, supporting H3K9me3 heterochromatin and silencing. Although shown directly in mouse ES cells, the mechanism
          is highly relevant to human MORC3 because the same domain architecture/function is conserved. (groh2021morc3silencesendogenous
          pages 10-11, groh2021morc3silencesendogenous pages 1-2, groh2020morc3silencesendogenous pages 10-13) | Genome-wide
          sgRNA screen, knockout/rescue mutants, ChIP-seq, ChIP-MS/IP-MS, ATAC-seq, H3.3 ChIP-qPCR, RT-qPCR | 2,737 reproducible
          Morc3 ChIP peaks; Morc3 loss increased chromatin accessibility at 444 peaks and decreased it at 10 peaks; ChIP-MS
          identified 489 Morc3-associated proteins; ATPase-cycle mutants failed to rescue ERV silencing. (groh2020morc3silencesendogenous
          pages 7-10, groh2021morc3silencesendogenous pages 1-2, groh2020morc3silencesendogenous pages 10-13) | Groh et al.,
          *Nat Commun* (Oct 2021), DOI: 10.1038/s41467-021-26288-7, https://doi.org/10.1038/s41467-021-26288-7 |
  - molecular_function:
      id: GO:0140002
      label: histone H3K4me3 reader activity
    description: >-
      The MORC3 CW-type zinc finger recognizes methylated H3K4, connecting MORC3 to chromatin-reader activity in nuclear chromatin
      contexts.
    directly_involved_in:
      - id: GO:0006325
        label: chromatin organization
    locations:
      - id: GO:0000785
        label: chromatin
      - id: GO:0005634
        label: nucleus
    supported_by:
      - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
        supporting_text: >-
          **Domain architecture and biochemical capabilities.** MORC3 is described as containing three conserved modules:
          (i) a **GHKL/HATPase-like ATPase domain** (a “GHL ATPase”/GHKL-type ATPase in the MORC family), (ii) a **CW-type
          zinc finger** reported to bind **methylated H3K4**, and (iii) a **coiled-coil** region implicated in dimerization/oligomerization
          (sloan2016morc3acomponent pages 3-5). These features fit the concept of MORC proteins as **chromatin-associated
          ATPases** that integrate ATPase-driven conformational changes with chromatin recognition (via CW) and multivalent
          interactions (via coiled-coil) to regulate nuclear substructures and transcriptional states (sloan2016morc3acomponent
          pages 3-5).
  - molecular_function:
      id: GO:0030674
      label: protein-macromolecule adaptor activity
    description: >-
      MORC3 acts as a SUMO-regulated PML-body scaffold/adaptor that recruits and maintains nuclear restriction factors at
      PML bodies and incoming viral genomes, contributing to antiviral restriction and interferon-beta regulatory programs.
    directly_involved_in:
      - id: GO:0140374
        label: antiviral innate immune response
      - id: GO:0032688
        label: negative regulation of interferon-beta production
    locations:
      - id: GO:0016605
        label: PML body
      - id: GO:0016363
        label: nuclear matrix
      - id: GO:0005634
        label: nucleus
    supported_by:
      - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
        supporting_text: >-
          **SUMO biology and PML nuclear bodies (PML-NBs/ND10).** MORC3 is a **SUMOylated** nuclear matrix/PML nuclear body
          client protein. It associates with PML nuclear bodies through **SUMO–SIM interactions** (SUMO on one partner and
          a SUMO-interacting motif on the other), specifically reported as a SUMO–SIM interaction with **PML isoform I** (sloan2016morc3acomponent
          pages 3-5, sloan2016morc3acomponent pages 13-15). PML nuclear bodies are SUMO-enriched subnuclear condensates and
          hubs for intrinsic immunity, DNA damage response, transcription regulation, and other nuclear processes; MORC3 is
          one of the SUMO-linked client proteins integrated into these assemblies (sloan2016morc3acomponent pages 3-5).
      - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
        supporting_text: >-
          | PML nuclear bodies / viral restriction | Human MORC3 (NXP2) is a SUMOylated nuclear-matrix protein that localizes
          to PML nuclear bodies via SUMO-SIM interactions with PML.I; its ATPase domain is required for PML-NB localization
          and for recruiting Sp100/p53. During HSV-1 infection, MORC3 is recruited to incoming viral genomes and promotes
          recruitment of intrinsic restriction factors (Sp100, hDaxx, PML, γH2AX). HSV-1 ICP0 counteracts this by degrading
          MORC3. MORC3 also restricts HCMV, although influenza studies indicate virus-specific proviral effects in other contexts.
          (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15, sloan2016morc3acomponent media 84630a9e)
          | SILAC/MS proteomics, colocalization microscopy, HSV-1 and HCMV plaque assays, shRNA knockdown, viral protein immunoblotting
          | MORC3 abundance decreased ~5.6-fold during HSV-1 infection in proteomics; MORC3 depletion caused a marked increase
          in plaque formation efficiency of ICP0-null HSV-1 and increased HCMV plaque formation; MORC3 colocalizes with PML-NB
          markers in punctate nuclear structures. (sloan2016morc3acomponent pages 3-5, sloan2016morc3acomponent pages 13-15,
          sloan2016morc3acomponent media 84630a9e) | Sloan et al., *J Virol* (Oct 2016), DOI: 10.1128/JVI.00621-16, https://doi.org/10.1128/JVI.00621-16
          |
      - reference_id: file:human/MORC3/MORC3-deep-research-falcon.md
        supporting_text: >-
          **Intrinsic immunity and interferon pathway modulation.** In OSCC/HNSCC models, MORC3 knockdown upregulated interferon-associated
          genes and increased STAT1 and PD-L1, suggesting MORC3 suppresses interferon-driven transcriptional programs in this
          context (fu2024genomewideanalysisreveals pages 3-7). In myositis/cancer-associated myositis literature, MORC3 is
          described as an antiviral factor and a repressor of IFNB1 (patasova2023geneticinfluencesin pages 6-8). Together,
          these suggest MORC3 contributes to a chromatin-based brake on interferon gene expression, with context-dependent
          consequences (antiviral restriction in fibroblast/hepatocyte models vs immune evasion phenotypes in cancer).
proposed_new_terms: []
suggested_questions:
  - question: >-
      Which MORC3 activities in human cells require the ATPase domain, the CW H3K4me3-reader domain, SUMOylation/SIM interactions,
      or combinations of these modules?
  - question: >-
      Does MORC3 directly bind specific DNA elements such as the IFNB1-adjacent MRE, or is repression mediated through chromatin-associated
      partner proteins?
suggested_experiments:
  - description: >-
      Rescue MORC3 knockout human cells with ATPase-dead, CW-domain, SUMOylation-defective, and SIM-interaction mutants, then
      measure PML-body localization, restriction-factor recruitment, IFNB1/MRE repression, and HSV-1/HCMV restriction.
    hypothesis: >-
      MORC3 antiviral and interferon-repressive functions require separable ATPase, chromatin-reader, and SUMO/PML-body interaction
      modules.
  - description: >-
      Perform CUT&RUN/CUT&Tag or ChIP-seq for endogenous MORC3 together with DNA-binding-deficient and partner-recruitment
      mutants at IFNB1/MRE, viral episomes, and retroelement loci.
    hypothesis: >-
      MORC3 occupies repressed chromatin templates through a partner-dependent chromatin scaffold mechanism rather than generic
      sequence-independent DNA binding.