The Aerobic and Anaerobic Respiratory Chain of Escherichia coli and Salmonella enterica : Enzymes and Energetics

• DOI: 10.1128/ecosalplus.esp-0005-2013
• Publication Date: 2014-10-27T11:59:55Z
• Authors: Gottfried Unden; Philipp Aloysius ...; Pia Degreif-Dünnwald
• Keywords: Electron acceptor; Salmonella enterica; NADH dehydrogenase

Escherichia coli contains a versatile respiratory chain that oxidizes 10 different electron donor substrates and transfers the electrons to terminal reductases or oxidases for reduction of six acceptors. Salmonella is able use two more The variation further increased by presence isoenzymes some substrates. A large number pathways can be established combining donors dehydrogenases quinones as acceptors are oxidized reductase oxidases. enzymes vary largely with respect their composition, architecture, membrane topology, mode energy conservation. Most energy-conserving (FdnGHI, HyaABC, HybCOAB, others) (CydAB, NarGHI, form proton potential (Δp) redox-loop mechanism. Two (NuoA-N CyoABCD) couple redox translocation pumping. do not conserve in potential. For most enzymes, mechanism generation known predicted. H+/2e- ratios chains range from 2 6 H+/2e-. energetics individual reactions described related ratios.