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The effect of growth substrate on the levels of citric acid cycle enzymes in the facultative methylotroph Arthrobacter 2B2

✍ Scribed by Dr. C. J. Paddon; M. A. Payton; B. S. Hartley

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
301 KB
Volume
25
Category
Article
ISSN
0233-111X

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✦ Synopsis

All enzymes of the citric acjd cycle were found to be present in cell-free extracts of the facultative methylotroph Arthrobaeter 2B2 except 2-oxoglutarate dehydrogenase and pyruvate dehydrogenase. The dehydrogenase (El) and lipoamide dehydrogenase (E,) component of 2-oxoglutarate could be detected indicating that the complex was present, but may be very labile. No great differences in enzyme levels were detected between cells grown on trimethylamine and those on multicarbon substrates. Citrate synthase was found to be insensitive to inhibition by NADH or 2-oxoglutarate, but some inhibition was observed with ATP.

Arthrobacter 2B2 (NCIB 11344) isolated from ditch water by enrichment in trimethylamine basal medium (COLBY and ZATMAN 1973) is a facultative methylotroph, growing well on a variety of one-carbon (C,) compounds or multi-carbon compounds. It

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