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Transcobalamin II (TCII) has been purified from Cohn fraction III of human plasma by batchwise binding to and then elution from carboxymethyl-Sephadex, affinity chromatography using photo-labile aminopropyl cobalamin coupled to activated Sephacryl S-200, and finally chromatography through carboxymethyl cellulose. The yield was approximately 80%. The addition of protease inhibitors in all steps of the purification procedure and extensive washing of the carboxymethyl-Sephadex prior to eluting the TCII minimized degradation of the protein and the final preparation of holo-TCII contained 1 mol of cobalamin/mol of protein. A single polypeptide of 43,000 daltons was obtained by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The NH2-terminal 19 amino acids have been determined for human TCII. 12 of the amino acids are homologous with rabbit TCII and six are homologous with human R-binder, but there is no homology with human intrinsic factor.
Authors : Quadros E V , Rothenberg S P , Pan Y C , Stein S ,
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