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:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Chance,B
Chance,B
中科院分区:
--
文献类型:
--
作者:
Yoshizaki,K;Radda,GK;Inubushi,T;Chance,B

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牛蛙胃平滑肌的31 P-NMR谱显示磷酸肌酸峰(4.8 μmol·g-1湿重),ATP(3.6)、无机磷酸盐(Pi,2.4)、磷酸单酯(3.0)和磷酸二酯(3.3)。细胞内的pH值为7.3,并计算从化学位移的Pi。1H-NMR光谱的平滑肌产生的峰值为2.9乳酸,6.6总肌酸(磷酸肌酸+肌酸)和胆碱的甲基质子暂定分配到glycerolphosphorylcholine或膜磷脂。在厌氧条件下,磷酸肌酸和ATP减少,细胞内酸化,乳酸增加。31 P饱和转移研究表明,γ-ATP共振饱和使磷酸肌酸的强度降低到对照值的60%,饱和时磷酸肌酸的T1值为2.4 s。肌酸激酶反应的正向通量(磷酸肌酸分解方向)计算值为0.77 μmol·g− 1湿重。s−1。肌酸激酶通量约为。100-比ATP周转率大10倍,ATP周转率由氧消耗率计算,假设P/O = 3。总之,肌酸激酶反应在牛蛙胃的静息平滑肌中处于平衡状态。
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.
DOI: --
发表时间: 1979
期刊: Biochemistry
影响因子: 2.9
作者:
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发表时间: 1982
期刊: Biochimica et Biophysica Acta
影响因子: --
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通过磷核磁共振分析完整肌肉中磷酸盐代谢物、细胞内 pH 值和三磷酸腺苷的状态。
DOI: --
发表时间: 1976
影响因子: 4.8
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DOI: --
发表时间: 1981
期刊: Biochimica et Biophysica Acta
影响因子: --
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DOI: --
发表时间: 1977
期刊:
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作者:
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