Characterization of a 23-kDa Protein Associated with CD40

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1995 Dec 5

PMID 8524818

Citations 7

Authors

T Morio

S Hanissian

R S Geha

Affiliations

Soon will be listed here.

Abstract

CD40 is a 45-kDa glycoprotein member of the tumor necrosis factor receptor (TNFR) family expressed on B cells, thymic epithelial cells, dendritic cells, and some carcinoma cells. The unique capacity of CD40 to trigger immunoglobulin isotype switching is dependent on the activation of protein-tyrosine kinases, yet CD40 possesses no kinase domain and no known consensus sequences for binding to protein-tyrosine kinases. Recently, an intracellular protein (CD40bp/LAP-1/CRAF-1) which belongs to the family of TNFR-associated proteins was reported to associate with CD40. We describe a 23-kDa cell surface protein (p23) which is specifically associated with CD40 on B cells and on urinary bladder transitional carcinoma cells. Protein microsequencing revealed that p23 shows no homology to any known protein. A rabbit antibody raised against a peptide derived from p23 recognized a 23-kDa protein in CD40 immunoprecipitates. In contrast to CD40bp/LAP-1/CRAF-1, p23 was not associated with TNFR p80 (CD120b). These findings suggest that p23 is a novel member of the CD40 receptor complex.

Citing Articles

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