Non-SMC condensin II complex subunit D3 (NCAPD3)

Non-SMC condensin II complex subunit D3 (NCAPD3) is a regulatory component of the condensin II complex, critically required for mitotic chromosome condensation, assembly, and segregation[1][2][3][4][5][7]. The condensin II complex, distinct from condensin I by its unique non-SMC subunits (including NCAPD3), is fundamental for establishing the architecture and rigidity of mitotic chromosomes and ensuring proper chromatid separation. NCAPD3 contains HEAT repeat domains, binds mono-methyl histone H4 Lys20—an event crucial for DNA repair and mitotic chromatin condensation—and is tightly regulated by phosphorylation, which facilitates condensin II function during mitosis[2][3][4]. NCAPD3 plays additional roles in maintaining genome stability, cooperating with the GAIT complex to suppress retrotransposition in somatic cells[1]. It has emerging importance in tumor biology, acting as both a potential oncogenic modulator (promoting expression of oncogenic factors EZH2 and MALAT1) and a prognostic biomarker, depending on cellular and disease context[1][4]. Mutations or dysregulation in NCAPD3 have been associated with autosomal recessive primary microcephaly and various human cancers, while its depletion affects mitochondrial function and cellular responses to oxidative stress[6]. No approved drugs specifically target NCAPD3, nor are there mechanism-of-action or safety concern data for therapy directly modulating this protein at this time.

Other names

Condensin-2 complex subunit D3CAPD3KIAA0056hCAP-D3CAP-D3hHCP-6hcp-6MCPH22FLJ42888