Carbon monoxide production is not enhanced by nitrogenase activity

FEMS Microbiology Ecology
P Milligan, G M King


A diverse group of nitrogen-fixing bacteria and two heme degraders were grown with and without fixed nitrogen sources under oxic and suboxic conditions, with and without addition of heme-containing compounds. Several of the strains produced carbon monoxide (CO) under one or more of these conditions, but nitrogenase activity did not stimulate rates of production relative to controls. Although nitrogenase can reduce CO(2) to CO in vitro in the absence of N(2), this process likely contributes minimally to CO production in soils under in situ conditions. In contrast, myoglobin or hematin addition under oxic conditions significantly stimulated CO production by the heme degraders. However, estimates of CO production from microbial heme turnover suggest that this too is likely to be only a small source of CO in soils in situ.



Jun 20, 1973·Biochimica Et Biophysica Acta·R R EngelZ J Petryka
Dec 1, 1972·Journal of Bacteriology·R R EngelS Schwartz
Nov 1, 1967·Proceedings of the National Academy of Sciences of the United States of America·W D StewartR H Burris
Sep 1, 1980·Applied and Environmental Microbiology·R Conrad, W Seiler
Jan 1, 1973·Plant Physiology·R F Troxler, J M Dokos

Related Concepts

Nitrogenase Activity
Myoglobin Measurement
MB gene
Biochemical Turnover
In Vitro [Publication Type]
Carboxyhemoglobin Measurement

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