SAMSN1 Proteins and Enzymes

SAMSN1 is a member of a novel gene family of putative adaptors and scaffold proteins containing SH3 and SAM (sterile alpha motif) domains. It also contains several predicted consensus nuclear localization signals and a tyrosine kinase phosphorylation motif. Northern blot analysis has revealed expression of a 2.2kb SAMSN1 transcript in human immune tissues and hematopoietic cell types including normal bone marrow, acute myeloid leukemia, and multiple myeloma; low-level expression was seen in other tissues such as heart, brain, placenta, and lung. SAMSN1 has been shown to be up-regulated by B cell activation signals and is a participant in B cell activation and differentiation.