FAM111A
Domain
The PIP-box mediates the interaction with PCNA.
Function
Single-stranded DNA-binding serine protease that mediates the proteolytic cleavage of covalent DNA-protein cross-links (DPCs) during DNA synthesis, thereby playing a key role in maintaining genomic integrity (PubMed:32165630). DPCs are highly toxic DNA lesions that interfere with essential chromatin transactions, such as replication and transcription, and which are induced by reactive agents, such as UV light or formaldehyde (PubMed:32165630). Protects replication fork from stalling by removing DPCs, such as covalently trapped topoisomerase 1 (TOP1) adducts on DNA lesion, or poly(ADP-ribose) polymerase 1 (PARP1)-DNA complexes trapped by PARP inhibitors (PubMed:32165630). Required for PCNA loading on replication sites (PubMed:24561620). Promotes S-phase entry and DNA synthesis (PubMed:24561620). Acts also as a restriction factor for some viruses including SV40 polyomavirus and vaccinia virus (PubMed:23093934, PubMed:37607234). Mechanistically, affects nuclear barrier function during viral replication by mediating the disruption of the nuclear pore complex (NPC) via its protease activity (PubMed:33369867, PubMed:37607234). In turn, interacts with vaccinia virus DNA-binding protein OPG079 in the cytoplasm and promotes its degradation without the need of its protease activity but through autophagy (PubMed:37607234).
Involvement in disease
Kenny-Caffey syndrome 2
KCS2
A disorder characterized by impaired skeletal development with small and dense bones, short stature, and primary hypoparathyroidism with hypocalcemia. Clinical features include cortical thickening and medullary stenosis of the tubular bones, delayed closure of fontanels, defective dentition, small eyes with hypermetropia, and frontal bossing with a triangular face.
None
The disease is caused by variants affecting the gene represented in this entry.
Gracile bone dysplasia
GCLEB
A perinatally lethal condition characterized by narrowing of the medullary cavity of the long bones and of the skull, gracile bones with thin diaphyses, premature closure of basal cranial sutures, and microphthalmia. Most affected individuals who survive beyond the perinatal period develop hypocalcemia with low parathyroid hormone levels.
None
The disease is caused by variants affecting the gene represented in this entry.
Post-translational modifications
Autocatalytically cleaved; activating the protein (PubMed:32165630). Autocatalytic cleavage takes place in trans (PubMed:32165630).
Sequence Similarities
Belongs to the FAM111 family.
Cellular localization
- Nucleus
- Chromosome
- Cytoplasm
- Mainly localizes to nucleus: colocalizes with PCNA on replication sites.
Alternative names
KIAA1895, FAM111A, Serine protease FAM111A