National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM137929
米国
引用
ジャーナル: Cell Metab / 年: 2025 タイトル: Formation of I+III supercomplex rescues respiratory chain defects. 著者: Chao Liang / Abhilash Padavannil / Shan Zhang / Sheryl Beh / David R L Robinson / Jana Meisterknecht / Alfredo Cabrera-Orefice / Timothy R Koves / Chika Watanabe / Miyuki Watanabe / María ...著者: Chao Liang / Abhilash Padavannil / Shan Zhang / Sheryl Beh / David R L Robinson / Jana Meisterknecht / Alfredo Cabrera-Orefice / Timothy R Koves / Chika Watanabe / Miyuki Watanabe / María Illescas / Radiance Lim / Jordan M Johnson / Shuxun Ren / Ya-Jun Wu / Dennis Kappei / Anna Maria Ghelli / Katsuhiko Funai / Hitoshi Osaka / Deborah Muoio / Cristina Ugalde / Ilka Wittig / David A Stroud / James A Letts / Lena Ho / 要旨: Mitochondrial electron transport chain (ETC) complexes partition between free complexes and quaternary assemblies known as supercomplexes (SCs). However, the physiological requirement for SCs and the ...Mitochondrial electron transport chain (ETC) complexes partition between free complexes and quaternary assemblies known as supercomplexes (SCs). However, the physiological requirement for SCs and the mechanisms regulating their formation remain controversial. Here, we show that genetic perturbations in mammalian ETC complex III (CIII) biogenesis stimulate the formation of a specialized extra-large SC (SC-XL) with a structure of I+III, resolved at 3.7 Å by cryoelectron microscopy (cryo-EM). SC-XL formation increases mitochondrial cristae density, reduces CIII reactive oxygen species (ROS), and sustains normal respiration despite a 70% reduction in CIII activity, effectively rescuing CIII deficiency. Consequently, inhibiting SC-XL formation in CIII mutants using the Uqcrc1 contact site mutation leads to respiratory decompensation. Lastly, SC-XL formation promotes fatty acid oxidation (FAO) and protects against ischemic heart failure in mice. Our study uncovers an unexpected plasticity in the mammalian ETC, where structural adaptations mitigate intrinsic perturbations, and suggests that manipulating SC-XL formation is a potential therapeutic strategy for mitochondrial dysfunction.