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Figure 4.
Fig. 4. The coupling of electron and proton flow in
anaerobic (a and b) and aerobic SQRs respiration (c and d),
respectively. Positive and negative sides of the membrane are
described for Fig. 1. (a and b) Electroneutral reactions as
catalyzed by diheme-containing QFR from W. succinogenes (a) and
the hemeless QFR from E. coli. (b) MK and MKH[2], menaquinone
and menaquinol, respectively. (c) Utilization of a transmembrane
electrochemical potential as possibly catalyzed by
diheme-containing SQR enzymes. (d) Electroneutral reaction as
catalyzed by monoheme-containing SQR enzymes (complex II). Q and
QH[2], ubiquinone and ubiquinol, respectively.
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