SF3B2

This gene encodes subunit 2 of the splicing factor 3b protein complex. Splicing factor 3b, together with splicing factor 3a and a 12S RNA unit, forms the U2 small nuclear ribonucleoproteins complex (U2 snRNP). The splicing factor 3b/3a complex binds pre-mRNA upstream of the intron's branch site in a sequence-independent manner and may anchor the U2 snRNP to the pre-mRNA. Splicing factor 3b is also a component of the minor U12-type spliceosome. Subunit 2 associates with pre-mRNA upstream of the branch site at the anchoring site. Subunit 2 also interacts directly with subunit 4 of the splicing factor 3b complex. Subunit 2 is a highly hydrophilic protein with a proline-rich N-terminus and a glutamate-rich stretch in the C-terminus. [provided by RefSeq]

Full Name

splicing factor 3b, subunit 2, 145kDa

Function

Involved in pre-mRNA splicing as a component of the splicing factor SF3B complex (PubMed:27720643).
SF3B complex is required for 'A' complex assembly formed by the stable binding of U2 snRNP to the branchpoint sequence (BPS) in pre-mRNA. Sequence independent binding of SF3A/SF3B complex upstream of the branch site is essential, it may anchor U2 snRNP to the pre-mRNA (PubMed:12234937).
May also be involved in the assembly of the 'E' complex (PubMed:10882114).
Belongs also to the minor U12-dependent spliceosome, which is involved in the splicing of rare class of nuclear pre-mRNA intron (PubMed:15146077).

Biological Process

Biological Process mRNA processingManual Assertion Based On ExperimentTAS:ProtInc
Biological Process mRNA splicing, via spliceosomeManual Assertion Based On ExperimentIDA:UniProtKB
Biological Process RNA splicingManual Assertion Based On ExperimentTAS:ProtInc
Biological Process U2-type prespliceosome assembly1 PublicationIC:ComplexPortal

Cellular Location

Nucleus
Nucleus speckle

PTM

Methylation at Arg-508 by PRMT9 is required for the interaction with SMN1.