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Bovine beta lacto globulin e beta lacto globulin f and beta lacto globulin g of bali banteng cattle bos javanicus



Bovine beta lacto globulin e beta lacto globulin f and beta lacto globulin g of bali banteng cattle bos javanicus



Australian Journal of Biological Sciences 34(2): 133-148



An electrophoretic examination was made of samples of milk from 8 Bali (banteng) cattle, B. (Bibos) javanicus, in the Northern Territory of Australia. There were 2 new electrophoretically distinct bovine .alpha.-lactoglobulins, designated E and F, present in these samples. Amino acid analysis and tryptic peptide mapping of isolated samples showed that both E and F differ from the B variant of domestic cattle (Bos taurus) by +1 Gly, -1 Glu at residue 157 or 158 and the F variant has the additional charge differences from E and B due to +1 Tyr, -1 Asp at residue 129 or 130. Studies of peptides produced by the action of Staphylococcus aureus strain V8 protease and by more recent amino acid analyses show that the Gly/Glu substitution is at residue 158; there is an additional Bali variant, designated .beta.-lactoglobulin G, differing from E by +1 Met, -1 Ile at residue 78, but having the same mobility as E; and there is a previously undetected neutral residue substitution of +1 Ser, -1 Pro at position 50 in the F variant. The relation of these variants to other known .beta.-lactoglobulin variants of the Bos genus is discussed.

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Accession: 004854840

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