The pattern and kinetics of substrate metabolism of Campylobacter jejuni and Campylobacter coli.
OBJECTIVE
The main aim was to investigate the patterns and kinetics of substrate oxidation by Campylobacter jejuni and C. coli.


RESULTS
Substrate oxidation profiles by 100 strains were determined using oxygen electrode system. All the isolates tested oxidized formate, l-lactate, cysteine, glutamine and serine with high oxidation rates and high affinity but varied in their ability to oxidize citric acid cycle intermediates, aspartic acid and serine.


CONCLUSIONS
Based on the oxidation ability of alpha-ketoglutarate, succinate, fumarate and aspartic acid, Campylobacter strains tested were divided into three distinct metabolic categories. The first group was able to metabolize alpha-ketoglutarate, succinate, fumarate and aspartic acid; the second group was unable to oxidize alpha-ketoglutarate; and the third group was unable to oxidize, succinate, fumarate, and aspartic acid. Furthermore, serine oxidation rate enabled the differentiation of C. jejuni and C. coli.


CONCLUSIONS
Overall, the results highlights the extensive metabolic diversity between and within Campylobacter species. In addition, the kinetic data of oxidized substrates obtained may improve the isolation procedures of the organism.
Mohammed
K A S
KA
Department of Life Sciences, King's College London, Franklin-Wilkins Building, London, UK.
Miles
R J
RJ
Halablab
M A
MA
D015373:Bacterial Typing Techniques / Q000295:instrumentation / Q000379:methods; D017000:Campylobacter coli / Q000145:classification* / Q000378:metabolism*; D016123:Campylobacter jejuni / Q000145:classification* / Q000378:metabolism*; D002952:Citric Acid Cycle; D004566:Electrodes; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen; D013379:Substrate Specificity
D010100:Oxygen