| Modification Notes |
PHF5A (PHD finger protein 5A), also known as SF3b14b or INI, is a 110 amino acid protein that contains one PHD finger-like domain and localizes to the nucleus. One of several members of the PHD finger superfamily, PHF5A functions as a subunit of the SF3A splicing factor complex, a heterotrimeric complex comprised of multiple subunits that act in tandem to mediate the binding of U2 snRNP to the branchpoint sequence (BPS) in pre-mRNA. The SF3A complex is necessary for the conversion of 15S U2 snRNP into the active 17S protein that performs directly in pre-mRNA splicing events. In conjunction with other members of the SF3A complex, PHF5A plays an important role in mediating pre-mRNA splicing and transcription. The gene encoding PHF5A maps to human chromosome 22, which houses over 500 genes and is the second smallest human chromosome. |