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TitleA 2.2 Å cryoEM structure of a quinol-dependent NO Reductase shows close similarity to respiratory oxidases.
Journal, issue, pagesNat Commun, Vol. 14, Issue 1, Page 3416, Year 2023
Publish dateJun 9, 2023
AuthorsAlex J Flynn / Svetlana V Antonyuk / Robert R Eady / Stephen P Muench / S Samar Hasnain /
PubMed AbstractQuinol-dependent nitric oxide reductases (qNORs) are considered members of the respiratory heme-copper oxidase superfamily, are unique to bacteria, and are commonly found in pathogenic bacteria where ...Quinol-dependent nitric oxide reductases (qNORs) are considered members of the respiratory heme-copper oxidase superfamily, are unique to bacteria, and are commonly found in pathogenic bacteria where they play a role in combating the host immune response. qNORs are also essential enzymes in the denitrification pathway, catalysing the reduction of nitric oxide to nitrous oxide. Here, we determine a 2.2 Å cryoEM structure of qNOR from Alcaligenes xylosoxidans, an opportunistic pathogen and a denitrifying bacterium of importance in the nitrogen cycle. This high-resolution structure provides insight into electron, substrate, and proton pathways, and provides evidence that the quinol binding site not only contains the conserved His and Asp residues but also possesses a critical Arg (Arg720) observed in cytochrome bo, a respiratory quinol oxidase.
External linksNat Commun / PubMed:37296134 / PubMed Central
MethodsEM (single particle)
Resolution2.2 Å
Structure data

16041

8bgw

EMDB-16041, PDB-8bgw:
CryoEM structure of quinol-dependent Nitric Oxide Reductase (qNOR) from Alcaligenes xylosoxidans at 2.2 A resolution
Method: EM (single particle) / Resolution: 2.2 Å

Chemicals

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-FE:
Unknown entry

ChemComp-CA:
Unknown entry

ChemComp-10M:
decyl 4-O-alpha-D-glucopyranosyl-1-thio-beta-D-glucopyranoside / detergent*YM

ChemComp-UQ1:
UBIQUINONE-1

ChemComp-LOP:
(1R)-2-{[(R)-(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(DODECANOYLOXY)METHYL]ETHYL (9Z)-OCTADEC-9-ENOATE / phospholipid*YM

ChemComp-HOH:
WATER

Source
  • achromobacter xylosoxidans (bacteria)
KeywordsMEMBRANE PROTEIN / quinol-dependent Nitric Oxide Reductase / proton transfer / quinol binding / ubiquinol oxidase

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