SSX2IP
Developmental stage
Expressed in interphase and M phase cells. Down-regulated by the miRNA miR338-3p.
Domain
Both the N-terminal (up to position 79) and the C-terminal (from position 304) sequences are required for interaction with SSX2.
Function
Belongs to an adhesion system, which plays a role in the organization of homotypic, interneuronal and heterotypic cell-cell adherens junctions (AJs). May connect the nectin-afadin and E-cadherin-catenin system through alpha-actinin and may be involved in organization of the actin cytoskeleton at AJs through afadin and alpha-actinin (By similarity). Involved in cell movement: localizes at the leading edge of moving cells in response to PDGF and is required for the formation of the leading edge and the promotion of cell movement, possibly via activation of Rac signaling (By similarity). Acts as a centrosome maturation factor, probably by maintaining the integrity of the pericentriolar material and proper microtubule nucleation at mitotic spindle poles. The function seems to implicate at least in part WRAP73; the SSX2IP:WRAP73 complex is proposed to act as regulator of spindle anchoring at the mitotic centrosome (PubMed:23816619, PubMed:26545777). Involved in ciliogenesis (PubMed:24356449). It is required for targeted recruitment of the BBSome, CEP290, RAB8, and SSTR3 to the cilia (PubMed:24356449).
Sequence Similarities
Belongs to the ADIP family.
Tissue Specificity
Widely expressed, with the highest expression in brain, intermediate expression in kidney, testis, spinal cord, liver, heart, lung, skeletal muscle, ovary, fetal liver and fetal brain, and little to no expression in pancreas and spleen. All specific brain regions showed intermediate to high expression, with highest expression in amygdala. Also expressed in fetal tissues, mainly in liver and brain.
Cellular localization
- Cell junction
- Adherens junction
- Nucleus
- Cytoplasm
- Cytoskeleton
- Microtubule organizing center
- Centrosome
- Centriolar satellite
- Cytoplasm
- Cytoskeleton
- Cilium basal body
- Not found at cell-matrix AJs.
Alternative names
KIAA0923, SSX2IP, Afadin- and alpha-actinin-binding protein, ADIP, Afadin DIL domain-interacting protein, SSX2-interacting protein