PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 6289876-1 1982 The titration curves of the C-2 histidine protons of RNase A and of derivative II--a covalent derivative obtained by reaction of the enzyme with the halogenated nucleotide 9-beta-D-ribofuranosyl-6-chloropurine 5"-phosphate--in the presence of a number of purine nucleosides, nucleoside monophosphates, and nucleoside diphosphates were studied by means of proton nuclear magnetic resonance at 270 MHz. Histidine 32-41 complement C2 Bos taurus 28-31 3410637-2 1988 The titration curves of the C-2 histidine protons of bovine pancreatic ribonuclease A in the presence of several dideoxynucleoside monophosphates (dNpdN) were studied by means of proton nuclear magnetic resonance at 270 MHz in order to obtain information on the ligand--RNase A interaction. Histidine 32-41 complement C2 Bos taurus 28-31 3410637-3 1988 The changes in the chemical shift and pKs of the C-2 proton resonances of His-12, -48, -119 in the complexes RNase A--dNpdN were smaller than those previously found when the enzyme interacted with mononucleotides. Histidine 74-77 complement C2 Bos taurus 49-52 3813569-2 1987 One of the histidine C-2 peaks titrated normally, with a pKa value of 6.8, but the other two histidines in this peptide had pKa values of 6.3. Histidine 11-20 complement C2 Bos taurus 21-24 3624221-5 1987 The 1H and 13C nuclear magnetic resonance data indicated that imidazole C-2 of histidine is linked to C-6 of norleucine (epsilon-deaminated lysine residue) which in turn is linked to the C-6 amino group of hydroxylysine. Histidine 79-88 complement C2 Bos taurus 72-75 921767-1 1977 The C-2 proton of one histidine residue in bovine erythrocyte superoxide dismutase is shown to be particularly labile. Histidine 22-31 complement C2 Bos taurus 4-7 393248-0 1979 The exchange of histidine C-2 protons in superoxide dismutases. Histidine 16-25 complement C2 Bos taurus 26-29 393248-2 1979 The rates of exchange of the C-2 protons of histidine residues in copper-zinc superoxide dismutase are substantially decreased by metal ion binding. Histidine 44-53 complement C2 Bos taurus 29-32 8090-0 1976 pH dependence of tritium exchange with the C-2 protons of the histidines in bovine trypsin. Histidine 62-72 complement C2 Bos taurus 43-46 8090-1 1976 At pH 8.9 and 37 degrees C the half-times for tritium exchange with the C-2 protons of the histidines of trypsin are 73 days for His-57, and greater than 1000 days for His-40 and His-91. Histidine 91-101 complement C2 Bos taurus 72-75 8090-1 1976 At pH 8.9 and 37 degrees C the half-times for tritium exchange with the C-2 protons of the histidines of trypsin are 73 days for His-57, and greater than 1000 days for His-40 and His-91. Histidine 129-132 complement C2 Bos taurus 72-75 8090-1 1976 At pH 8.9 and 37 degrees C the half-times for tritium exchange with the C-2 protons of the histidines of trypsin are 73 days for His-57, and greater than 1000 days for His-40 and His-91. Histidine 168-171 complement C2 Bos taurus 72-75 8090-1 1976 At pH 8.9 and 37 degrees C the half-times for tritium exchange with the C-2 protons of the histidines of trypsin are 73 days for His-57, and greater than 1000 days for His-40 and His-91. Histidine 168-171 complement C2 Bos taurus 72-75 8090-2 1976 These half-times are much longer than the half-life of exchange for the C-2 proton of free histidine (2.8 days at pD 8.2), and longer than any previously reported half-time of exchange at pH greater than 8. Histidine 91-100 complement C2 Bos taurus 72-75 4454-2 1976 One of the four titrating histidine ring C-2 proton resonances of bovine pancreatic ribonuclease has been assigned to histidine residue 12. Histidine 26-35 complement C2 Bos taurus 41-44 4454-2 1976 One of the four titrating histidine ring C-2 proton resonances of bovine pancreatic ribonuclease has been assigned to histidine residue 12. Histidine 118-127 complement C2 Bos taurus 41-44 4454-3 1976 This was accomplished by a direct comparison of the rate of tritium incorporation into position C-2 of histidine 12 of S-peptide (residues 1 to 20) derived from ribonuclease S, with the rates of deuterium exchange of the four histidine C-2 proton resonances of ribonuclease S under the same experimental conditions. Histidine 103-112 complement C2 Bos taurus 96-99 239193-2 1975 For neurophysin I alone, a normal titration curve for the C-2 proton resonance of the lone histidine residue was obtained with an apparent ionization constant of 6.9 addition of oxytocin to a solution of neurophysin I at pH 6.5 resulted in several changes in the spectrum. Histidine 91-100 complement C2 Bos taurus 58-61