STUDIES ON HUMAN ANTIBODIES

Abstract

Antilevan, antidextran, antiteichoic acid, anti-"A" and normal [gamma] G, all isolated from a single human, as well as pooled [gamma]G and [gamma] [image], were analyzed for amino acid content. Differences ranging from 7 to 32 residues were found among these antibodies in glycine, valine, leucine, tyrosine, arginine, lysine, and threonine content. These conspicuous differences in amino acid composition were not correlated with the Gm type of these antibodies. Hydroxylysine was found in 2 of the 4 antibodies, antidextran and antiteichoic acid, and in [gamma][image] immunoglobulin. No hydroxylysine was found in [gamma] G globulins. These findings probably account for discrepancies in the literature concerning the occurrence of this residue in antibody protein.