This antibody specifically reacts with the isoform 1 of human SAFB protein. SF3A1, also known as SF3a120, is a 793 amino acid protein, which is a Subunit of the splicing factor SF3A required for 'A' complex assembly formed by the stable binding of U2 snRNP to the branchpoint sequence (BPS) in pre-mRNA. SF3A1 also be involved in the assembly of the 'E' complex. The calculated molecular weight of SAFB is 103 kDa, but the modified SAFB is about 130-175 kDa.
This gene encodes a DNA-binding protein which has high specificity for scaffold or matrix attachment region DNA elements (S/MAR DNA). This protein is thought to be involved in attaching the base of chromatin loops to the nuclear matrix but there is conflicting evidence as to whether this protein is a component of chromatin or a nuclear matrix protein. Scaffold attachment factors are a specific subset of nuclear matrix proteins (NMP) that specifically bind to S/MAR. The encoded protein is thought to serve as a molecular base to assemble a 'transcriptosome complex' in the vicinity of actively transcribed genes. It is involved in the regulation of heat shock protein 27 transcription, can act as an estrogen receptor co-repressor and is a candidate for breast tumorigenesis. This gene is arranged head-to-head with a similar gene whose product has the same functions. Multiple transcript variants encoding different isoforms have been found for this gene.
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Protein Aliases: DKFZp779C1727; glutathione S-transferase fusion protein; heat-shock protein (HSP27) estrogen response element and TATA box-binding protein; Hsp27 ERE-TATA binding protein; HSP27 ERE-TATA-binding protein; HSP27 estrogen response element-TATA box-binding protein; SAF-B; Scaffold attachment factor B1
Gene Aliases: HAP; HET; SAB-B1; SAF-B; SAF-B1; SAFB; SAFB1
UniProt ID: (Human) Q15424
Entrez Gene ID: (Human) 6294