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Crystal structures of the gastric proton pump

机译:胃质子泵的晶体结构

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摘要

The gastric proton pump-the H+, K+-ATPase-is a P-type ATPase responsible for acidifying the gastric juice down to pH 1. This corresponds to a million-fold proton gradient across the membrane of the parietal cell, the steepest known cation gradient of any mammalian tissue. The H+, K+-ATPase is an important target for drugs that treat gastric acid-related diseases. Here we present crystal structures of the H+, K+-ATPase in complex with two blockers, vonoprazan and SCH28080, in the luminal-open state, at 2.8 angstrom resolution. The drugs have partially overlapping but clearly distinct binding modes in the middle of a conduit running from the gastric lumen to the cation-binding site. The crystal structures suggest that the tight configuration at the cation-binding site lowers the pK(a) value of Glu820 sufficiently to enable the release of a proton even into the pH 1 environment of the stomach.
机译:胃质子泵(H +,K + -ATPase)是负责酸化胃液至pH 1的P型ATPase。这对应于整个壁细胞膜(最陡的已知阳离子)的百万倍质子梯度。任何哺乳动物组织的梯度。 H +,K + -ATPase是治疗胃酸相关疾病的药物的重要靶标。在这里,我们介绍了H +,K + -ATPase的晶体结构,与两种阻断剂vonoprazan和SCH28080处于腔开放状态,分辨率为2.8埃。在从胃腔到阳离子结合位点的导管中间,药物具有部分重叠但明显不同的结合模式。晶体结构表明,阳离子结合位点的紧密构型充分降低了Glu820的pK(a)值,足以使质子释放到胃的pH 1环境中。

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  • 来源
    《Nature》 |2018年第7700期|214-218|共5页
  • 作者单位

    Nagoya Univ, Cellular & Struct Physiol Inst, Nagoya, Aichi, Japan;

    Nagoya Univ, Cellular & Struct Physiol Inst, Nagoya, Aichi, Japan;

    Nagoya Univ, Cellular & Struct Physiol Inst, Nagoya, Aichi, Japan;

    Rockefeller Univ, Lab Mol Electron Microscopy, 1230 York Ave, New York, NY 10021 USA;

    Nagoya Univ, Cellular & Struct Physiol Inst, Nagoya, Aichi, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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