Abstract
Bovine β 2-microglobulin ( β 2-m) was purified from colostrum milk in two chromatographic steps: anion-exchange chromatography, and gel filtration. The amino acid sequence was determined to confirm that the purified protein was β 2-m. A molecular weight of 11.8 kDa β 2-m was estimated using sodium dodecyl sulfate—polyacrylamide gel electrophoresis. Bovine β 2-m consists of 98 amino acid residues and contains one disulfide linkage connecting residues 25 and 79. The amino acid sequence determined by this study is different from a previously published sequence at three sites, but agrees with the amino acid sequence from cDNA. Thus, we can conclude that the amino acid sequence determined in this study is correct.
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