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• W1968462013 abstract "Hydrogen exchange rate constants of the 25 most rapidly exchanging peptide amide protons in bovine pancreatic trypsin inhibitor have been determined over a range of pH that spans pHmin, the pH of minimum rate. Most of these are on the protein surface, exposed to solvent and not hydrogen bonded in the crystal structure. Contrary to commonly held assumptions, the exchange kinetics of surface NH groups are not equivalent to the kinetics of NH groups in peptides in the extended configuration. All surface NH groups exchange more slowly than NH groups in model peptides, with rate constants distributed over a range of more than two orders of magnitude. In addition, their pHmin values vary widely. For most of the surface NH groups, pHmin is lower than in model compounds and, for several, pHmin is < 1. These results indicate that the local environment of the surface peptide groups when the exchange event occurs is very different from that of extended peptides. Analysis based on consideration of an O-protonation mechanism for acid catalysis and of electrostatic effects on exchange kinetics further indicates (see the accompanying paper) that, in general, exchange of surface NH groups occurs from a conformation of the protein approximated by the crystal structure. The 1H-2H exchange rate constants were measured from 300 MHz nuclear magnetic resonance spectra in which assigned surface N1H resonances are resolved by the use of partially deuterated protein samples. A marked pH dependence of the chemical shifts observed in the pH range 1 to 4.5 for several surface NH groups reflects the titration of nearby carboxyl groups." @default.
• W1968462013 created "2016-06-24" @default.
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• W1968462013 date "1985-09-01" @default.
• W1968462013 modified "2023-10-10" @default.
• W1968462013 title "Hydrogen kinetics of peptide amide protons at the bovine pancreatic trypsin inhibitor protein-solvent interface" @default.
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• W1968462013 doi "https://doi.org/10.1016/0022-2836(85)90412-7" @default.
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