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- W1580948719 abstract "Abstract The pK values of the 3 histidine residues in the common alpha subunits of bovine and equine glycoprotein hormones have been determined from titration curves generated from their C-2 proton nuclear magnetic resonances at different pH values. Assignment of resonances to specific histidines is based on a comparison between the two species, which have 1 histidine residue in different positions in their sequences, and of the bovine alpha subunit after removal of its histidine 94 by treatment with carboxypeptidases. In both species, those histidines closest to the COOH terminus titrate with near normal pK values of 6.2. The histidine residue found in the bovine subunit at position 87 titrates with an approximate pK value of 5.4. Histidine 83, adjacent to an oligosaccharide moiety in both species, does not titrate over a pH range of 4.0 to 8.0 and thus appears inaccessible to solvent. Similarly, in bovine lutropin-beta, 1 of 3 histidine residues does not titrate between pH 5.0 and 7.0. In the intact hormone, 2 nontitratable histidine residues are found. Changes in the characteristics of the signals, however, preclude unambiguous assignment of these two resonances to the nontitrating histidines in the isolated subunits. It appears that changes in the environment of at least some histidines occur when the subunits combine to yield intact hormone." @default.
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- W1580948719 title "Proton nuclear magnetic resonance studies on bovine lutropin, its subunits, and on the alpha subunit of pregnant mare serum gonadotropin. Assignment of histidine resonances in the alpha subunit." @default.
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- W1580948719 doi "https://doi.org/10.1016/s0021-9258(17)30010-8" @default.
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