Role of mitochondria-cytoskeleton interactions in respiration regulation and mitochondrial organization in striated muscles

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• 作者：Minna Varikmaa ; Rafaela Bagur ; Tuuli Kaambre ; Alexei Grichine ; Natalja Timohhina ; Kersti Tepp ; Igor Shevchuk ; Vladimir Chekulayev ; Madis Metsis ; Fran莽ois Boucher ; Valdur Saks ; Andrey V. Kuznetsov ; Rita Guzun
• 关键词：Skeletal muscle ; Energy flux ; Respiration ; Metabolic control analysis ; Intracellular energy unit
• 刊名：Biochimica et Biophysica Acta (BBA)/Bioenergetics
• 出版年：February, 2014
• 年：2014
• 卷：1837
• 期：2
• 页码：232-245
• 全文大小：2439 K

文摘

The aim of this work was to study the regulation of respiration and energy fluxes in permeabilized oxidative and glycolytic skeletal muscle fibers, focusing also on the role of cytoskeletal protein tubulin 尾II isotype in mitochondrial metabolism and organization. By analyzing accessibility of mitochondrial ADP, using respirometry and pyruvate kinase-phosphoenolpyruvate trapping system for ADP, we show that the apparent affinity of respiration for ADP can be directly linked to the permeability of the mitochondrial outer membrane (MOM). Previous studies have shown that MOM permeability in cardiomyocytes can be regulated by VDAC interaction with cytoskeletal protein, 尾II tubulin. We found that in oxidative soleus skeletal muscle the high apparent K_m for ADP is associated with low MOM permeability and high expression of non-polymerized 尾II tubulin. Very low expression of non-polymerized form of 尾II tubulin in glycolytic muscles is associated with high MOM permeability for adenine nucleotides (low apparent K_m for ADP).