6sh3

Structure of the ADP state of the heptameric Bcs1 AAA-ATPase

Loading... Status: waiting for Mol* initialization Structural highlights 6sh3 is a 7 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.4Å Ligands: ADP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function BCS1_YEAST Essential for the expression of the Rieske iron-sulfur protein. Publication Abstract from PubMed Some proteins require completion of folding before translocation across a membrane into another cellular compartment. Yet the permeability barrier of the membrane should not be compromised and mechanisms have remained mostly elusive. Here, we present the structure of Saccharomyces cerevisiae Bcs1, an AAA-ATPase of the inner mitochondrial membrane. Bcs1 facilitates the translocation of the Rieske protein, Rip1, which requires folding and incorporation of a 2Fe-2S cluster before translocation and subsequent integration into the bc1 complex. Surprisingly, Bcs1 assembles into exclusively heptameric homo-oligomers, with each protomer consisting of an amphipathic transmembrane helix, a middle domain and an ATPase domain. Together they form two aqueous vestibules, the first being accessible from the mitochondrial matrix and the second positioned in the inner membrane, with both separated by the seal-forming middle domain. On the basis of this unique architecture, we propose an airlock-like translocation mechanism for folded Rip1. Structure of the Bcs1 AAA-ATPase suggests an airlock-like translocation mechanism for folded proteins.,Kater L, Wagener N, Berninghausen O, Becker T, Neupert W, Beckmann R Nat Struct Mol Biol. 2020 Feb;27(2):142-149. doi: 10.1038/s41594-019-0364-1. Epub, 2020 Jan 27. PMID:31988523 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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