Structure of Escherichia coli cytochrome bd-II type oxidase with bound aurachin D

Abstract: Cytochrome bd quinol:O2 oxidoreductases are respiratory terminal oxidases so far only identified in prokaryotes, including several pathogenic bacteria. Escherichia coli contains two bd oxidases of which only the bd-I type is structurally characterized. Here, we report the structure of the Escherichia coli cytochrome bd-II type oxidase with the bound inhibitor aurachin D as obtained by electron cryo-microscopy at 3 Å resolution. The oxidase consists of subunits AppB, C and X that show an architecture similar to that of bd-I. The three heme cofactors are found in AppC, while AppB is stabilized by a structural ubiquinone-8 at the homologous positions. A fourth subunit present in bd-I is lacking in bd-II. Accordingly, heme b595 is exposed to the membrane but heme d embedded within the protein and showing an unexpectedly high redox potential is the catalytically active centre. The structure of the Q-loop is fully resolved, revealing the specific aurachin binding

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch
Notes
Nature communications. - 12, 1 (2021) , 6498, ISSN: 2041-1723

Event
Veröffentlichung
(where)
Freiburg
(who)
Universität
(when)
2021
Creator
Grauel, Antonia
Kägi, Jan P.
Rasmussen, Tim
Makarchuk, Iryna
Oppermann, Sabrina
Moumbock, Aurélien F. A.
Wohlwend, Daniel
Müller, Rolf
Melin, Frédéric
Günther, Stefan
Hellwig, Petra
Böttcher, Bettina
Friedrich, Thorsten

DOI
10.1038/s41467-021-26835-2
URN
urn:nbn:de:bsz:25-freidok-2227043
Rights
Kein Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
25.04.2025, 2:42 PM CEST

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Time of origin

  • 2021

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