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The forms of vitamin B12 on the transcobalamins. 1977

C M MacDonald, and J Farquharson, and R G Bessent, and J F Adams

1. The transcobalamins from normal serum were obtained in two fractions. One contained transcobalamin I and transcobalamin III: the other contained transcobalamin II. The forms of vitamin B12 in the two fractions were then examined. 2. Methylcobalamin and adenosylcobalamin were found in both fractions. Hydroxocobalamin was found in the fraction containing transcobalamin I and transcobalamin III. Cyanocobalamin was found in both fractions in two cases, in the transcobalamin III fraction only in one case and was absent in one case.

UI MeSH Term Description Entries
D001798 Blood Proteins Proteins that are present in blood serum, including SERUM ALBUMIN; BLOOD COAGULATION FACTORS; and many other types of proteins. Blood Protein,Plasma Protein,Plasma Proteins,Serum Protein,Serum Proteins,Protein, Blood,Protein, Plasma,Protein, Serum,Proteins, Blood,Proteins, Plasma,Proteins, Serum
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014155 Transcobalamins A group of carrier proteins which bind with VITAMIN B12 in the BLOOD and aid in its transport. Transcobalamin I migrates electrophoretically as a beta-globulin, while transcobalamins II and III migrate as alpha-globulins. Cobalamin-Binding Protein,Transcobalamin,Transcobalamin II,Vitamin B 12-Binding Protein,Vitamin B 12-Binding Proteins,Vitamin B12-Binding Protein,Cobalamin-Binding Proteins,Cobalophilin,Haptocorrin,Holo-Transcobalamin II,R-Binder,Transcobalamin (I),Transcobalamin I,Transcobalamin III,Vitamin B 12 Binder,Vitamin B12-Binding Proteins,B12-Binding Protein, Vitamin,Cobalamin Binding Protein,Cobalamin Binding Proteins,Holo Transcobalamin II,Protein, Cobalamin-Binding,Protein, Vitamin B12-Binding,Proteins, Cobalamin-Binding,Proteins, Vitamin B12-Binding,R Binder,Vitamin B 12 Binding Protein,Vitamin B 12 Binding Proteins,Vitamin B12 Binding Protein,Vitamin B12 Binding Proteins
D014805 Vitamin B 12 A cobalt-containing coordination compound produced by intestinal micro-organisms and found also in soil and water. Higher plants do not concentrate vitamin B 12 from the soil and so are a poor source of the substance as compared with animal tissues. INTRINSIC FACTOR is important for the assimilation of vitamin B 12. Cobalamin,Cyanocobalamin,Cobalamins,Eritron,Vitamin B12,B 12, Vitamin,B12, Vitamin

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