嗜熱菌ATP酶結構獲揭示
作者:
小柯機器人發布時間:2019/8/23 13:57:07
奧地利科學技術研究所Leonid A. Sazanov團隊報導了完整嗜熱菌V/A型ATP酶的結構及其構象可塑性。該項研究成果發表在2019年8月23日出版的《科學》上。
研究人員解析了完整的嗜熱菌(Thermus thermophilus)V/A型ATP酶的冷凍電鏡結構,並以三種旋轉狀態和包含兩種底物的方式重構進脂質納米圓盤中。這些結構表明工作酶中V1和V0之間具有很大的靈活性,這是由於中心軸旋轉和外圍杆的阻力之間的機械競爭造成的。 研究人員還描述了二磷酸腺苷抑制釋放,V1-V0扭矩傳遞和質子易位的細節,這與整個V型ATP酶家族相關。
研究人員表示, 在古細菌和真細菌中發現的V/ A型腺苷三磷酸酶(ATP酶)使用旋轉催化機制將ATP水解或合成與穿過質膜的質子轉運連接起來。它們屬於V型ATP酶家族,這在整體結構上與線粒體/葉綠體F型ATP合酶不同。
附:英文原文
Title: Structure and conformational plasticity of the intact Thermus thermophilus V/A-type ATPase
Author: Long Zhou, Leonid A. Sazanov
Issue&Volume: Volume 365 Issue 6455
Abstract: V (vacuolar)/A (archaeal)-type adenosine triphosphatases (ATPases), found in archaea and eubacteria, couple ATP hydrolysis or synthesis to proton translocation across the plasma membrane using the rotary-catalysis mechanism. They belong to the V-type ATPase family, which differs from the mitochondrial/chloroplast F-type ATP synthases in overall architecture. We solved cryo–electron microscopy structures of the intact Thermus thermophilus V/A-ATPase, reconstituted into lipid nanodiscs, in three rotational states and two substates. These structures indicate substantial flexibility between V1 and Vo in a working enzyme, which results from mechanical competition between central shaft rotation and resistance from the peripheral stalks. We also describe details of adenosine diphosphate inhibition release, V1-Vo torque transmission, and proton translocation, which are relevant for the entire V-type ATPase family.
DOI: 10.1126/science.aaw9144
Source: https://science.sciencemag.org/content/365/6455/eaaw9144
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037