GTP gamma S-dependent regulation of smooth muscle contractile elements.

GTP gamma S-dependent regulation of smooth muscle contractile elements.
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GTP γ S 依赖性平滑肌收缩元件的调节。

DOI:
10.1152/ajpcell.1992.262.2.c405
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发表时间:
1992
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Stull,JT
Stull,JT
中科院分区:
--
文献类型:
--
作者:
Kubota,Y;Nomura,M;Kamm,KE;Mumby,MC;Stull,JT

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鸟苷5‘-O-(3-硫代三磷酸)(GTP Gamma S)增加通透性气管平滑肌对钙激活的收缩反应的敏感性。张力的增加与肌球蛋白轻链磷酸化的比例增加有关。磷酸化位点被确定为丝氨酸-19,与肌球蛋白轻链激酶快速磷酸化的位点相对应。蛋白磷酸酶抑制剂冈田酸引起的收缩作用不受GTP-γS的影响,但能增强非钙依赖性肌球蛋白轻链激酶的收缩作用。在气管匀浆中,依赖于Ca(2+)的肌球蛋白轻链激酶活性不受天冬氨酸转氨酶-S的影响,但~(32)P标记的重肌球蛋白被磷酸酶去磷酸化受到抑制。因此,S可能通过抑制蛋白磷酸酶对肌球蛋白轻链的活性而增加气管平滑肌收缩元件的钙敏感性。
Guanosine 5'-O-(3-thiotriphosphate) (GTP gamma S) increases the sensitivity of the contractile response to activation by Ca2+ in permeabilized tracheal smooth muscle. Increased tension was associated with a proportional increase in myosin light chain phosphorylation. The site of phosphorylation was determined to be serine-19, which corresponds to the site rapidly phosphorylated by myosin light chain kinase. GTP gamma S did not affect the contraction induced by the protein phosphatase inhibitor okadaic acid but did enhance contraction produced by Ca(2+)-independent myosin light chain kinase. In tracheal homogenates Ca(2+)-dependent myosin light chain kinase activity was not affected by GTP gamma S; however, dephosphorylation of 32P-labeled heavy meromyosin by phosphatase was inhibited. Thus GTP gamma S may increase the Ca2+ sensitivity of contractile elements in tracheal smooth muscle by inhibition of protein phosphatase activity toward myosin light chain.
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