Molecular Target Synopsis
Domains and Structures
Drugs and Clinical Candidates
Ligand Efficiency Plot
Family Cladogram
Interaction Network
Gene Expression
Gene Copy Number Variation
Germline Genetics

SF3B1 (O75533) - Overview - Molecular Target Synopsis


SF3B1, Splicing factor 3B subunit 1
UniProt O75533

Also Known as SF3B1_HUMAN, SF3B1, SAP155

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). Component of the B-WICH complex, at least composed of SMARCA5/SNF2H, BAZ1B/WSTF, SF3B1, DEK, MYO1C, ERCC6, MYBBP1A and DDX21 (PubMed:16603771). Identified in the spliceosome C complex (PubMed:11991638). Component of the U11/U12 snRNPs that are part of the U12-type spliceosome (PubMed:15146077). Component of splicing factor SF3B complex which is composed of at least eight subunits; SF3B1, SF3B2, SF3B3, SF3B4, SF3B5, SF3B6, PHF5A and DDX42 (PubMed:12234937, PubMed:12738865, PubMed:28541300, PubMed:27720643). SF3B associates with the splicing factor SF3A and a 12S RNA unit to form the U2 small nuclear ribonucleoproteins complex (U2 snRNP). Interacts directly with the splicing factor U2AF (PubMed:12234937). Within the SF3B complex interacts directly (via HEAT domain) with SF3B3, SF3B5 and (via HEAT domain) with PHF5A (PubMed:27720643). Interacts directly with SF3B6 (PubMed:16432215, Ref.36, PubMed:21062891). The SF3B complex composed of SF3B1, SF3B2, SF3B3, SF3B4, SF3B5, SF3B6 and PHF5A interacts with U2AF2 (PubMed:27720643). Phosphorylated form interacts with PPP1R8 (PubMed:12105215). Interacts with PQBP1 (PubMed:23512658). Interacts with RBM17 (PubMed:17589525). Interacts with RBM39 (PubMed:24795046). Interacts with SETX (PubMed:21700224). Interacts with RBM15 (PubMed:26575292).

Isoforms / Transcripts (Protein Coding)

Sub-cellular localization

UniProt: SF3B1 is active in the following subcellular-locations: nucleus, nucleus speckle.
GO terms: SF3B1 is active in the following subcellular-locations: catalytic step 2 spliceosome, nuclear speck, nucleoplasm, nucleus, spliceosomal complex, U11/U12 snRNP, U12-type spliceosomal complex, U2 snRNP, U2-type precatalytic spliceosome, U2-type prespliceosome.

GO terms

Gene Copy Number Variation

In COSMIC - Cell Lines Project SF3B1 has gain in 0 cell-lines, loss in 0 cell-lines and no signal in 1005 cell-lines. (see details)

Gene Expression

In NCI60, the highest expressing cell lines are: TK_10, RXF_393, CCRF_CEM

In Array Express (RNA-seq of 675 commonly used human cancer cell lines), the highest expressing cell lines are: OUMS-23, KYSE-30, MHH-ES-1

In Array Express (RNA-seq of long poly adenylated RNA and long non poly adenylated RNA from ENCODE cell lines), the highest expressing cell lines are: SK-N-SH, NHLF, HSMM

(see details)

3D Structures

For SF3B1 there are:
16 structures (20 chains) solved
1 are solved in complex with at least one small molecule ligand

(see details)
Molecular Target 3D Synopsis

Screening and Chemistry

SF3B1 has been screened with compounds ( bioactivities). (see details)