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SAM domain of LBP1 (UBP1) transcription factors SAM (sterile alpha motif) domain of LBP1 (also known as UBP1) transcription factor is a putative protein-protein interaction domain. Proteins of this group have an N-terminal DNA-binding CP2 domain, a central predicted SAM domain and some also have a C-terminal dimerization domain. They are involved in transcriptional regulation from early development to terminal differentiation. In particular, they regulate alpha-globin in erythroid cells and P450scc (the cholesterol side-chain cleavage enzyme, cytochrome) in human placenta. Human LBP1 is known to be induced by HIV type I infection in lymphocytes; it represses HIV transcription by preventing the binding of TFIID to the virus promoter. Additionally, it has been suggested that UBP1 (LPB1) regulator might be a member of a blood pressure controlling network. LBP1 protein isoforms are able to form dimers, apparently via SAM domain since SAM deletion or mutation resulted in a loss of this ability. |
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PubMed References
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Jiyao W et al.(2023). "The conserved domain database in 2023.",