Alternative products:Additional isoforms seem to exist ,Disease:Defects in CD40 are the cause of hyper-IgM immunodeficiency type 3 (HIGM3) [MIM:606843]. HIGM3 is an autosomal recessive disorder which includes an inability of B cells to undergo isotype switching , one of the final differentiation steps in the humoral immune system , an inability to mount an antibody-specific immune response , and a lack of germinal center formation. ,Function:Receptor for TNFSF5/CD40LG. ,online information:CD40 entry ,online information:CD40 mutation db ,similarity:Contains 4 TNFR-Cys repeats. ,subunit:Monomer and homodimer. The variant form found in the bladder carcinoma cell line Hu549 does not form homodimers. Interacts with TRAF1 , TRAF2 , TRAF3 , TRAF5 and TRAF6. ,tissue specificity:B-cells and in primary carcinomas. ,
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