Fusion proteins comprising gp39 and CD8

摘要

The present invention relates to fusion proteins having gp39 protein sequences, which fusion proteins bind to the B cell antigen, CD40. More specifically, the invention relates to fusion proteins having gp39 protein sequences attached to a polypeptide having an amino terminal secretory signal sequence to allow export of the fusion protein out of the recombinant host cell in which it is produced. The fusion proteins of this invention may be useful for promoting B cell proliferation.