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首页> 外文期刊>Biochemistry >Changes in Isoform Composition, Structure,and Functional Properties of Titin from Mongolian Gerbil(Meriomes unguiculatus) Cardiac Muscle after Space Flight
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Changes in Isoform Composition, Structure,and Functional Properties of Titin from Mongolian Gerbil(Meriomes unguiculatus) Cardiac Muscle after Space Flight

机译:蒙古沙鼠心脏肌肉的Titin同工型组成,结构和功能性质的变化

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摘要

Changes in isoform composition, secondary structure, and titin phosphorylation in Mongolian gerbil (Meriones unguiculatus) cardiac muscle were studied after 12-day-long space flight onboard the Russian spacecraft Foton-M3. The effect of titin on the actin-activated myosin ATPase activity at pCa 7.5 and 4.6 was also studied. Almost twofold increase in titin long N2BA isoform content relative to that of short N2B isoform was found on electrophoregrams of cardiac muscle left ventricle of the flight group gerbils. Differences in secondary structure of titin isolated from cardiac muscle of control and flight groups of gerbils were found. An increase in phosphorylation (1.30-1.35-fold) of titin of cardiac muscle of the flight group gerbils was found. A decrease in activating effect of titin of cardiac muscle of the flight group gerbils on acto-myosin ATPase activity in vitro was also found. The observed changes are discussed in the context of M. unguiculatus cardiac muscle adaptation to conditions of weightlessness.
机译:在俄罗斯福田-M3航天飞机上进行了为期12天的太空飞行后,研究了蒙古沙鼠(Meriones unguiculatus)心肌的同工型组成,二级结构和替丁磷酸化的变化。还研究了tatin对pCa 7.5和4.6时肌动蛋白激活的肌球蛋白ATPase活性的影响。在飞行组沙鼠的心肌左心室电泳图上发现,与短N2B同工型相比,长N2BA同工型的滴定蛋白几乎增加了两倍。发现从对照组和沙鼠飞行组的心肌中分离的替丁的二级结构存在差异。发现飞行组沙鼠的心肌肌钙蛋白磷酸化增加(1.30-1.35倍)。还发现飞行组沙土鼠的心肌肌酐在体外对肌动球蛋白ATP酶活性的激活作用降低。在M. unguiculatus心肌适应失重状况的背景下讨论了观察到的变化。

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