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-Structure paper
タイトル | Gastric proton pump with two occluded K engineered with sodium pump-mimetic mutations. |
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ジャーナル・号・ページ | Nat Commun, Vol. 12, Issue 1, Page 5709, Year 2021 |
掲載日 | 2021年9月29日 |
著者 | Kazuhiro Abe / Kenta Yamamoto / Katsumasa Irie / Tomohiro Nishizawa / Atsunori Oshima / |
PubMed 要旨 | The gastric H,K-ATPase mediates electroneutral exchange of 1H/1K per ATP hydrolysed across the membrane. Previous structural analysis of the K-occluded E2-P transition state of H,K-ATPase showed a ...The gastric H,K-ATPase mediates electroneutral exchange of 1H/1K per ATP hydrolysed across the membrane. Previous structural analysis of the K-occluded E2-P transition state of H,K-ATPase showed a single bound K at cation-binding site II, in marked contrast to the two K ions occluded at sites I and II of the closely-related Na,K-ATPase which mediates electrogenic 3Na/2K translocation across the membrane. The molecular basis of the different K stoichiometry between these K-counter-transporting pumps is elusive. We show a series of crystal structures and a cryo-EM structure of H,K-ATPase mutants with changes in the vicinity of site I, based on the structure of the sodium pump. Our step-wise and tailored construction of the mutants finally gave a two-K bound H,K-ATPase, achieved by five mutations, including amino acids directly coordinating K (Lys791Ser, Glu820Asp), indirectly contributing to cation-binding site formation (Tyr340Asn, Glu936Val), and allosterically stabilizing K-occluded conformation (Tyr799Trp). This quintuple mutant in the K-occluded E2-P state unambiguously shows two separate densities at the cation-binding site in its 2.6 Å resolution cryo-EM structure. These results offer new insights into how two closely-related cation pumps specify the number of K accommodated at their cation-binding site. |
リンク | Nat Commun / PubMed:34588453 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.6 - 3.4 Å |
構造データ | EMDB-31294, PDB-7et1: PDB-7efl: PDB-7efm: PDB-7efn: |
化合物 | ChemComp-MG: ChemComp-RB: ChemComp-J3C: ChemComp-NAG: ChemComp-HOH: ChemComp-PCW: ChemComp-K: ChemComp-ALF: ChemComp-CLR: |
由来 |
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キーワード | MEMBRANE PROTEIN / Cation pump / P-type ATPase / gastric / proton pump / gastric proton pump / primary transporter / transporter |