The human Ig-beta cDNA sequence, a homologue of murine B29, is identical in B cell and plasma cell lines producing all the human Ig isotypes (original) (raw)

Abstract

The B cell Ag receptor complex consists of at least two disulfide-linked, heterodimeric structures: the clonally restricted membrane Ig (mIg) molecule and the nonpolymorphic Ig-alpha:Ig-beta protein dimer. The latter molecule is encoded by two separate genes, mb-1 and B29. The DNA sequences of murine and human mb-1 and murine B29 have been determined previously. This study describes the sequence of the full-length human cDNA homologue of the murine Ig-beta/B29 message. The human sequence codes for a protein that displays the typical subunit features of a transmembrane member of the Ig superfamily. The transmembrane and intracytoplasmic domains exhibit striking nucleotide and amino acid sequence similarity between the two species. These regions show almost complete conservation of areas presumed to be involved in noncovalent interactions with other members of the receptor complex and with intracellular kinases and cytoskeletal components. The only sequence dissimilarity seen in these...

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