1H- and 31P-NMR studies on smooth muscle of bullfrog stomach.
1H- and 31P-NMR studies on smooth muscle of bullfrog stomach.
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牛蛙胃平滑肌的 1H 和 31P-NMR 研究。
DOI:
10.1016/0167-4889(87)90083-8
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发表时间:
1987
期刊:
影响因子:
--
通讯作者:
Chance,B
中科院分区:
文献类型:
--
作者:
Yoshizaki,K;Radda,GK;Inubushi,T;Chance,B
31P-NMR spectra of bullfrog stomach smooth muscle showed peaks for creatine phosphate (4.8 μmol·g−1wet wt.), ATP (3.6), inorganic phosphate (Pi, 2.4), phosphomonoesters (3.0) and phosphodiesters (3.3). The intracellular pH was 7.3, and calculated from the chemical shift of Pi.1H-NMR spectra of smooth muscle yielded peaks of 2.9 for lactate, 6.6 for total creatine (creatine phosphate + creatine) and methyl protons of choline tentatively assigned to glycerolphosphorylcholine or to membrane phospholipids. Creatine phosphate and ATP decreased under anaerobic conditions, and intracellular acidification was observed with the concomitant increase in lactate.31P saturation transfer studies showed that saturation of the γ-ATP resonance reduced the intensity of creatine phosphate to 60% of its control value, and the measuredT1value of creatine phosphate was 2.4 s with saturation. The calculated forward flux of the creatine kinase reaction (decomposition direction of creatine phosphate) was 0.77 μmol·g−1wet wt.·s−1. The creatine kinase flux was approx. 100-times larger than the ATP turnover rate, calculated from the oxygen consumption rate with the assumption, P/O = 3. In conclusion, the creatine kinase reaction is at equilibrium in resting smooth muscle of bullfrog stomach.
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影响因子:
2.9
作者:
R. Nunnally;D. Hollis
通讯作者:
D. Hollis
DOI:
--
发表时间:
1982
期刊:
Biochimica et Biophysica Acta
影响因子:
--
作者:
Paul M. Matthews;J. Bland;D. G. Gadian;G. Radda
通讯作者:
G. Radda
影响因子:
4.8
作者:
Burt Ct;T. Glonek;M. Bárány
通讯作者:
M. Bárány
DOI:
--
发表时间:
1981
期刊:
Biochimica et Biophysica Acta
影响因子:
--
作者:
K. Yoshizaki;Y. Seo;H. Nishikawa
通讯作者:
H. Nishikawa
DOI:
--
发表时间:
1977
期刊:
影响因子:
--
作者:
D. Gadian;M. Dawson;D. Wilkie
通讯作者:
D. Wilkie