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General description of the gene and the encoded protein(s) using information from HGNC and Ensembl, as well as predictions made by the Human Protein Atlas project.
Gene namei
Official gene symbol, which is typically a short form of the gene name, according to HGNC.
Assigned HPA protein class(es) for the encoded protein(s).
Cancer-related genes Human disease related genes Plasma proteins
Predicted locationi
All transcripts of all genes have been analyzed regarding the location(s) of corresponding protein based on prediction methods for signal peptides and transmembrane regions.
Genes with at least one transcript predicted to encode a secreted protein, according to prediction methods or to UniProt location data, have been further annotated and classified with the aim to determine if the corresponding protein(s) are secreted or actually retained in intracellular locations or membrane-attached.
Remaining genes, with no transcript predicted to encode a secreted protein, will be assigned the prediction-based location(s).
The annotated location overrules the predicted location, so that a gene encoding a predicted secreted protein that has been annotated as intracellular will have intracellular as the final location.
Gene information from Ensembl and Entrez, as well as links to available gene identifiers are displayed here. Information was retrieved from Ensembl if not indicated otherwise.
Chromosome
2
Cytoband
q33.1
Chromosome location (bp)
197388515 - 197435079
Number of transcriptsi
Number of protein-coding transcripts from the gene as defined by Ensembl.
Useful information about the protein provided by UniProt.
Component of the 17S U2 SnRNP complex of the spliceosome, a large ribonucleoprotein complex that removes introns from transcribed pre-mRNAs 1,2,3,4. The 17S U2 SnRNP complex (1) directly participates in early spliceosome assembly and (2) mediates recognition of the intron branch site during pre-mRNA splicing by promoting the selection of the pre-mRNA branch-site adenosine, the nucleophile for the first step of splicing 5,6. Within the 17S U2 SnRNP complex, SF3B1 is part of the SF3B subcomplex, which is required for 'A' complex assembly formed by the stable binding of U2 snRNP to the branchpoint sequence in pre-mRNA 7. Sequence independent binding of SF3A and SF3B subcomplexes upstream of the branch site is essential, it may anchor U2 snRNP to the pre-mRNA 8. May also be involved in the assembly of the 'E' complex 9. Also acts as a component of the minor spliceosome, which is involved in the splicing of U12-type introns in pre-mRNAs 10,11. Together with other U2 snRNP complex components may also play a role in the selective processing of microRNAs (miRNAs) from the long primary miRNA transcript, pri-miR-17-92 (By similarity)....show less
Molecular function (UniProt)i
Keywords assigned by UniProt to proteins due to their particular molecular function.
RNA-binding
Biological process (UniProt)i
Keywords assigned by UniProt to proteins because they are involved in a particular biological process.
mRNA processing, mRNA splicing
Gene summary (Entrez)i
Useful information about the gene from Entrez
This gene encodes subunit 1 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. The carboxy-terminal two-thirds of subunit 1 have 22 non-identical, tandem HEAT repeats that form rod-like, helical structures. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]...show less
PROTEIN INFORMATIONi
The protein information section displays alternative protein-coding transcripts (splice variants) encoded by this gene according to the Ensembl database.
The Splice variant identifier links to the Ensembl website protein summary for the selected splice variant. The data in the Swissprot and TrEMBL columns links to corresponding pages in the UniProt database.
The protein classes assigned to this protein are shown if expanding the data in the protein class column. Parent protein classes are in bold font and subclasses are listed under the parent class.
The length of the protein (amino acid residues according to Ensembl), molecular mass (kDalton), predicted signal peptide and number of predicted transmembrane region(s) according to in-house majority decision methods based on sets of predictors are also reported.
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Plasma proteins Cancer-related genes Mutated cancer genes Mutational cancer driver genes COSMIC somatic mutations in cancer genes COSMIC Somatic Mutations COSMIC Missense Mutations Human disease related genes Cancers Cancers of haematopoietic and lymphoid tissues Cardiovascular diseases Hematologic diseases Mapped to neXtProt neXtProt - Evidence at protein level Protein evidence (Kim et al 2014) Protein evidence (Ezkurdia et al 2014)
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Cancer-related genes Mutated cancer genes Mutational cancer driver genes COSMIC somatic mutations in cancer genes COSMIC Somatic Mutations COSMIC Missense Mutations Human disease related genes Cancers Cancers of haematopoietic and lymphoid tissues Cardiovascular diseases Hematologic diseases Protein evidence (Ezkurdia et al 2014)
B4DGZ4 [Direct mapping] Splicing factor 3B subunit 1; cDNA FLJ57368, highly similar to Splicing factor 3B subunit 1
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Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Cancer-related genes Mutated cancer genes Mutational cancer driver genes COSMIC somatic mutations in cancer genes COSMIC Somatic Mutations COSMIC Missense Mutations Human disease related genes Cancers Cancers of haematopoietic and lymphoid tissues Cardiovascular diseases Hematologic diseases Protein evidence (Ezkurdia et al 2014)
The Human Protein Atlas project is funded
