National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM144120
米国
Medical Research Council (MRC, United Kingdom)
MC_UU_00028/2
英国
Medical Research Council (MRC, United Kingdom)
MC_UU_00015/1
英国
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/S00940X/1
英国
European Union (EU)
Instruct-ERIC/ESFRI
European Union
Research Foundation - Flanders (FWO)
ベルギー
引用
ジャーナル: Sci Adv / 年: 2023 タイトル: Structural basis of purine nucleotide inhibition of human uncoupling protein 1. 著者: Scott A Jones / Prerana Gogoi / Jonathan J Ruprecht / Martin S King / Yang Lee / Thomas Zögg / Els Pardon / Deepak Chand / Stefan Steimle / Danielle M Copeman / Camila A Cotrim / Jan ...著者: Scott A Jones / Prerana Gogoi / Jonathan J Ruprecht / Martin S King / Yang Lee / Thomas Zögg / Els Pardon / Deepak Chand / Stefan Steimle / Danielle M Copeman / Camila A Cotrim / Jan Steyaert / Paul G Crichton / Vera Moiseenkova-Bell / Edmund R S Kunji / 要旨: Mitochondrial uncoupling protein 1 (UCP1) gives brown adipose tissue of mammals its specialized ability to burn calories as heat for thermoregulation. When activated by fatty acids, UCP1 catalyzes ...Mitochondrial uncoupling protein 1 (UCP1) gives brown adipose tissue of mammals its specialized ability to burn calories as heat for thermoregulation. When activated by fatty acids, UCP1 catalyzes the leak of protons across the mitochondrial inner membrane, short-circuiting the mitochondrion to generate heat, bypassing ATP synthesis. In contrast, purine nucleotides bind and inhibit UCP1, regulating proton leak by a molecular mechanism that is unclear. We present the cryo-electron microscopy structure of the GTP-inhibited state of UCP1, which is consistent with its nonconducting state. The purine nucleotide cross-links the transmembrane helices of UCP1 with an extensive interaction network. Our results provide a structural basis for understanding the specificity and pH dependency of the regulatory mechanism. UCP1 has retained all of the key functional and structural features required for a mitochondrial carrier-like transport mechanism. The analysis shows that inhibitor binding prevents the conformational changes that UCP1 uses to facilitate proton leak.