NLS3-Tex30

Family: NLS3-Tex30

Block: X

Parent Family: No family

Comment

This entry consists of the KAT8 regulatory NSL complex subunit 3 (KANSL3 or NSL3, also known as testis development protein PRTD) and the testis-expressed sequence 30 proteins (TEX30). KAT8 regulatory NSL complex subunit 3 is part of the NSL complex that is involved in acetylation of nucleosomal histone H4 on several lysine residues and therefore may be involved in the regulation of transcription. Meunier et al identified KANSL3 as a microtubule minus-end-binding protein. In C. Elegans SUMV-2 interacts with SUMV-1, and they may function together with MYS-2 in a nematode KAT8/MOF-like complex to antagonise the activity of the synMuv (synthetic multivulva) genes. The function of the testis-expressed sequence 30 protein is not known. Wu et al. showed that KANSL3 is a subunit of a nonspecific lethal (NSL) histone acetyltransferase (HAT) complex that acetylates core histone H4. NSL3 and the O-linked N-acetylglucosamine (O-GlcNAc) transferase OGT1 are subunits of an NSL HAT complex that acetylates histone H4 residues lys5 (K5), K8, and K16. Knockdown of OGT1 or NSL3 reduced global H4K16 acetylation in a dose-dependent manner. Immunoprecipitation analysis in HEK293 and HeLa cells revealed that endogenous OGT1 and NSL3 interacted, and mutation analysis revealed that the N-terminal TPR repeat domain of OGT1 interacted with the abhydrolase domain of NSL3. In vitro, OGT1 catalyzed O-GlcNAc modification of NSL3 in the presence of donor UDP-GlcNAc. The O-GlcNAc modification stabilized NSL3, and stabilized NSL3 was required for H4K16 acetylation by the HAT NSL complex