ジャーナル: Elife / 年: 2013 タイトル: De novo modeling of the F(420)-reducing [NiFe]-hydrogenase from a methanogenic archaeon by cryo-electron microscopy. 著者: Deryck J Mills / Stella Vitt / Mike Strauss / Seigo Shima / Janet Vonck / 要旨: Methanogenic archaea use a [NiFe]-hydrogenase, Frh, for oxidation/reduction of F420, an important hydride carrier in the methanogenesis pathway from H2 and CO2. Frh accounts for about 1% of the ...Methanogenic archaea use a [NiFe]-hydrogenase, Frh, for oxidation/reduction of F420, an important hydride carrier in the methanogenesis pathway from H2 and CO2. Frh accounts for about 1% of the cytoplasmic protein and forms a huge complex consisting of FrhABG heterotrimers with each a [NiFe] center, four Fe-S clusters and an FAD. Here, we report the structure determined by near-atomic resolution cryo-EM of Frh with and without bound substrate F420. The polypeptide chains of FrhB, for which there was no homolog, was traced de novo from the EM map. The 1.2-MDa complex contains 12 copies of the heterotrimer, which unexpectedly form a spherical protein shell with a hollow core. The cryo-EM map reveals strong electron density of the chains of metal clusters running parallel to the protein shell, and the F420-binding site is located at the end of the chain near the outside of the spherical structure. DOI:http://dx.doi.org/10.7554/eLife.00218.001.
名称: F420-reducing [NiFe] hydrogenase / タイプ: protein_or_peptide / ID: 1 / Name.synonym: Frh, FrhABG 詳細: The Frh complex is a tetrahedral dodecamer of an FrhA, FrhB, FrhG heterotrimer. The substrate F420 is bound to FrhB コピー数: 12 / 集合状態: dodecamer / 組換発現: No