CD81 Antigen (CD81) Pan Troglodytes Recombinant Protein

CD81: May play an important role in the regulation of lymphoma cell growth. Interacts with a 16-kDa Leu-13 protein to form a complex possibly involved in signal transduction. May act as the viral receptor for HCV. Defects in CD81 are the cause of immunodeficiency common variable type 6 (CVID6); also called antibody deficiency due to CD81 defect. CVID6 is a primary immunodeficiency characterized by antibody deficiency, hypogammaglobulinemia, recurrent bacterial infections and an inability to mount an antibody response to antigen. The defect results from a failure of B-cell differentiation and impaired secretion of immunoglobulins; the numbers of circulating B-cells is usually in the normal range, but can be low. Belongs to the tetraspanin (TM4SF) family.

Protein type: Membrane protein, integral; Membrane protein, multi-pass

Chromosomal Location of Human Ortholog: 11p15.5

Cellular Component: focal adhesion; membrane; integral to plasma membrane; plasma membrane; immunological synapse; vesicle

Molecular Function: protein binding

Biological Process: virion attachment, binding of host cell surface receptor; cell proliferation; protein localization; positive regulation of peptidyl-tyrosine phosphorylation; regulation of immune response; entry of virus into host cell; activation of MAPK activity; positive regulation of 1-phosphatidylinositol 4-kinase activity; positive regulation of cell proliferation; phosphatidylinositol biosynthetic process; positive regulation of B cell proliferation; phosphatidylinositol metabolic process

Disease: Immunodeficiency, Common Variable, 6