SAFB1 Antibody – Mouse Monoclonal

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.[provided by RefSeq, Jan 2011]

SAFB1: Binds to scaffold/matrix attachment region (S/MAR) DNA and forms a molecular assembly point to allow the formation of a 'transcriptosomal' complex (consisting of SR proteins and RNA polymerase II) coupling transcription and RNA processing. Can function as an estrogen receptor corepressor and can also bind to the HSP27 promoter and decrease its transcription. When associated with RBMX, binds to and stimulates transcription from the SREBF1 promoter. Can inhibit cell proliferation.

Protein type: Nuclear receptor co-regulator; RNA-binding; DNA-binding

Chromosomal Location of Human Ortholog: 19p13.3-p13.2

Cellular Component: nucleoplasm; nucleus

Molecular Function: protein binding; double-stranded DNA binding; nucleotide binding; chromatin binding

Biological Process: establishment and/or maintenance of chromatin architecture; estrogen receptor signaling pathway; transcription, DNA-dependent; hormone metabolic process; positive regulation of transcription from RNA polymerase II promoter; growth