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Author |
Saigo, S. |
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Title |
Kinetic and equilibrium studies of alkaline isomerization of vertebrate cytochromes c |
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Journal Article |
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Year |
1981 |
Publication |
Biochimica et Biophysica Acta |
Abbreviated Journal |
Biochim Biophys Acta |
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Volume |
669 |
Issue |
1 |
Pages  |
13-20 |
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Keywords |
Amino Acid Sequence; Animals; Cytochrome c Group/*metabolism; Dogs; Hydrogen-Ion Concentration; Isomerism; Kinetics; Vertebrates/metabolism |
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Abstract |
Equilibria and kinetics of alkaline isomerization of seven ferricytochromes c from vertebrates were studied by pH-titration and pH-jump methods in the pH region of 7-12. In the equilibrium behavior, no significant difference was detected among the cytochromes c, whereas marked differences in the kinetic behavior were observed. According to the kinetic behavior of the isomerization, the cytochromes c examined fall into three classes: Group I (horse, sheep, dog and pigeon cytochromes c), Group II (tuna and bonito cytochromes c) and Group III (rhesus monkey cytochrome c). The kinetic results are interpreted in terms of the sequential scheme: Neutral form in equilibrium with fast Transient form in equilibrium with slow Alkaline form where the neutral and alkaline forms are the species stable at neutral and alkaline pH, respectively, and the transient form is a kinetic intermediate. From comparison of the primary sequences of the seven cytochromes c and the classification of these cytochromes c, it is concluded that the amino acid substitution Phe/Tyr at the 46-th position has a major influence on the kinetic behavior. In Group II and III cytochromes c, the ionization of Tyr-46 is suggested to bring about loosening of the heme crevice and thus facilitate the ligand replacement involved in the isomerization. |
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English |
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0006-3002 |
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PMID:6271238 |
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no |
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Call Number |
refbase @ user @ |
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3871 |
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Author |
Grubb P, |
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Title |
Equus burchelli |
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Journal Article |
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Year |
1981 |
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Mammalia |
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Volume |
157 |
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1-9 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1138 |
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Author |
Gillan DJ; Premack D; Woodruff G |
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Title |
Reasoning in the chimpanzee: I. Analogical reasoning |
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Journal Article |
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Year |
1981 |
Publication |
J. Exp. Psychol.: Anim. Behav. Process. |
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7 |
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1 |
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Equine Behaviour @ team @ |
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3063 |
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Author |
Bannikov Ag, |
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Title |
Kulan Moskau |
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1981 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
921 |
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Author |
Clutton-Brock, Juliet. |
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Title |
Domesticated animals from early times |
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Year |
1981 |
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Univ of Texas Press |
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Austin |
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9780292715325 |
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no |
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Equine Behaviour @ team @ |
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4088 |
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Author |
Wittenberger, James F. |
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Title |
Animal Social Behavior |
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Year |
1981 |
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Duxbury Press |
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Boston |
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978-0878722952 |
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no |
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Equine Behaviour @ team @ |
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4262 |
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Author |
Bean, P. |
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Title |
Punishment: A Philosophical and Criminological Enquiry |
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Miscellaneous |
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1981 |
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no |
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Equine Behaviour @ team @ |
Serial |
4851 |
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