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Glutamate synthase ec 1.4.7.1 activity of heterocysts and vegetative cells of the cyanobacterium anabaena variabilis


Glutamate synthase ec 1.4.7.1 activity of heterocysts and vegetative cells of the cyanobacterium anabaena variabilis



Journal of General Microbiology 128(9): 2203-2206



ISSN/ISBN: 0022-1287

Glutamate synthase (GOGAT) activities in cell-free extracts of isolated heterocysts and whole filaments of the cyanobacterium A. variabilis Kutz. (ATCC 29413) were determined by measuring [14C]glutamate production from 2-oxo[14C]glutarate or from [14C]glutamine, both of which are GOGAT substrates. There was negligible [14C]glutamate production from 2-oxo-[14C]glutarate in the presence of aminooxyacetate, which inhibits aminotransferase activity (< 3% of that detectable in whole filament extracts). In experiments using [14C]glutamine, [14C]glutamate production by heterocyst extracts accounted for .apprx. 17% of that detected in whole filament extracts, even in the absence of 2-oxoglutarate, ferredoxin and sodium dithionite. Apparently, virtually all the [14C]glutamate formed from [14C]glutamine in heterocyst extracts is independent of GOGAT activity.

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Accession: 005528745

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