Proton translocation coupled to electron flow from endogenous substrates to fumarate in anaerobically grown Escherichia coli K12

Abstract

Observed leads to H+/2e- values for proton translocation during the reduction of fumarate by endogenous substrates in anaerobic cells of Escherichia coli K12 varied with fumarate concentration. This variation was probably due mainly to incomplete fumarate utilization. Under optimum conditions a minimum value for leads to H+/2e- of 1.04+/-0.20 was obtained.