Abstract
A new protein has been identified in both rabbit and human serum. The salient characteristic of this protein is its high negative charge as revealed by its rapid anodal migration during electrophoresis at alkaline pH. This protein has tentatively been designated fast-moving protein because of its electrophoretic mobility. Molecular weight determination by polyacrylamide gel electrophoresis in sodium dodecyl sulfate indicated that the molecular weight was 85,000 daltons. A goat antiserum made to the rabbit fast-moving protein cross-reacted with both rabbit and human serum albumin. Although no apparent structural relationship between fast-moving protein and albumin was found by peptide-mapping studies, a peptide with a molecular weight of 24,000 daltons and with antigenic determinants in common with rabbit fast-moving protein, was isolated from cyanogen bromide-treated human serum albumin. The structural relationship between fast-moving protein and albumin is discussed.
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