PMID- 31655736 OWN - NLM STAT- MEDLINE DCOM- 20200706 LR - 20200706 IS - 2162-5468 (Electronic) IS - 0065-2911 (Linking) VI - 75 DP - 2019 TI - Bacterial nitrous oxide respiration: electron transport chains and copper transfer reactions. PG - 137-175 LID - S0065-2911(19)30024-4 [pii] LID - 10.1016/bs.ampbs.2019.07.001 [doi] AB - Biologically catalyzed nitrous oxide (N(2)O, laughing gas) reduction to dinitrogen gas (N(2)) is a desirable process in the light of ever-increasing atmospheric concentrations of this important greenhouse gas and ozone depleting substance. A diverse range of bacterial species produce the copper cluster-containing enzyme N(2)O reductase (NosZ), which is the only known enzyme that converts N(2)O to N(2). Based on phylogenetic analyses, NosZ enzymes have been classified into clade I or clade II and it has turned out that this differentiation is also applicable to nos gene clusters (NGCs) and some physiological traits of the corresponding microbial cells. The NosZ enzyme is the terminal reductase of anaerobic N(2)O respiration, in which electrons derived from a donor substrate are transferred to NosZ by means of an electron transport chain (ETC) that conserves energy through proton motive force generation. This chapter presents models of the ETCs involved in clade I and clade II N(2)O respiration as well as of the respective NosZ maturation and maintenance processes. Despite differences in NGCs and growth yields of N(2)O-respiring microorganisms, the deduced bioenergetic framework in clade I and clade II N(2)O respiration is assumed to be equivalent. In both cases proton motive quinol oxidation by N(2)O is thought to be catalyzed by the Q cycle mechanism of a membrane-bound Rieske/cytochrome bc complex. However, clade I and clade II organisms are expected to differ significantly in terms of auxiliary electron transport processes as well as NosZ active site maintenance and repair. CI - Copyright (c) 2019 Elsevier Ltd. All rights reserved. FAU - Hein, Sascha AU - Hein S AD - Microbial Energy Conversion and Biotechnology, Department of Biology, Technische Universitat Darmstadt, Darmstadt, Germany. FAU - Simon, Jorg AU - Simon J AD - Microbial Energy Conversion and Biotechnology, Department of Biology, Technische Universitat Darmstadt, Darmstadt, Germany. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20191010 PL - England TA - Adv Microb Physiol JT - Advances in microbial physiology JID - 0117147 RN - 0 (Bacterial Proteins) RN - 789U1901C5 (Copper) RN - EC 1.- (Oxidoreductases) RN - EC 1.7.2.4 (nitrous oxide reductase) RN - K50XQU1029 (Nitrous Oxide) SB - IM MH - Bacteria/classification/enzymology/genetics/*metabolism MH - Bacterial Proteins/genetics/metabolism MH - Copper/*metabolism MH - Electron Transport MH - Nitrous Oxide MH - Oxidoreductases/genetics/metabolism MH - Phylogeny OTO - NOTNLM OT - Anaerobic respiration OT - Clade I and clade II nitrous oxide reductase OT - Climate change OT - Greenhouse gas OT - Nitrous oxide (N(2)O, laughing gas) respiration OT - NosZ OT - Quinone/quinol pool OT - Rieske/cytochrome bc complex OT - Wolinella succinogenes OT - nos gene cluster EDAT- 2019/10/28 06:00 MHDA- 2020/07/07 06:00 CRDT- 2019/10/28 06:00 PHST- 2019/10/28 06:00 [entrez] PHST- 2019/10/28 06:00 [pubmed] PHST- 2020/07/07 06:00 [medline] AID - S0065-2911(19)30024-4 [pii] AID - 10.1016/bs.ampbs.2019.07.001 [doi] PST - ppublish SO - Adv Microb Physiol. 2019;75:137-175. doi: 10.1016/bs.ampbs.2019.07.001. Epub 2019 Oct 10.