Fast kinase domain-containing protein 3 is a mitochondrial protein essential for cellular respiration

详细信息    查看全文

• 作者：Maria Simarro ; Alfredo Gimenez-Cassina ; Nancy Kedersha ; Jean-Bernard Lazaro ; Guillaume O. Adelmant ; Jarrod A. Marto ; Kirsten Rhee ; Sarah Tisdale ; Nika Danial ; Charaf Benarafa ; Anonio Orduñ ; a ; Paul
• 关键词：FASTKD2 ; FASTKD3 ; Mitochondria ; Respiration ; Interactome ; Mitochondrial respiratory chain complexes
• 刊名：Biochemical and Biophysical Research Communications
• 出版年：2010
• 出版时间：22 October 2010
• 年：2010
• 卷：401
• 期：3
• 页码：440-446
• 全文大小：1047 K

文摘

Fas-activated serine/threonine phosphoprotein (FAST) is the founding member of the FAST kinase domain-containing protein (FASTKD) family that includes FASTKD1–5. FAST is a sensor of mitochondrial stress that modulates protein translation to promote the survival of cells exposed to adverse conditions. Mutations in FASTKD2 have been linked to a mitochondrial encephalomyopathy that is associated with reduced cytochrome c oxidase activity, an essential component of the mitochondrial electron transport chain. We have confirmed the mitochondrial localization of FASTKD2 and shown that all FASTKD family members are found in mitochondria. Although human and mouse FASTKD1–5 genes are expressed ubiquitously, some of them are most abundantly expressed in mitochondria-enriched tissues. We have found that RNA interference-mediated knockdown of FASTKD3 severely blunts basal and stress-induced mitochondrial oxygen consumption without disrupting the assembly of respiratory chain complexes. Tandem affinity purification reveals that FASTKD3 interacts with components of mitochondrial respiratory and translation machineries. Our results introduce FASTKD3 as an essential component of mitochondrial respiration that may modulate energy balance in cells exposed to adverse conditions by functionally coupling mitochondrial protein synthesis to respiration.