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- W2057691628 abstract "Summary: The activity of the proline catabolic enzyme pyrroline-5-carboxylate dehydrogenase (EC 1.5.1.12) was induced up to threehundredfold by the addition of three hundred proline to the growth medium of the Gram-positive bacterium Streptomyces coelicolor A3(2). Rifampicin, an inhibitor of RNA polymerase activity, abolished induction, implying that regulation was at the level of activation of gene transcription. The enzyme was purified and SDS-PAGE of the highly purified enzyme preparation revealed a single subunit with M r 68000. A single band of protein, which also stained for enzyme activity, was observed after native gel electrophoresis. The M r of the enzyme was estimated to be approximately 265000 by native gel electrophoresis and approximately 305000 by gel filtration, which indicated that the enzyme had a tetrameric quaternary structure. The apparent K m for pyrroline-5-carboxylate was 109 pm7-3 M, whilst that for NAD+ was 43-3+2-5 M. Product inhibition by NADH (apparent K i 0-6 mM) was observed. The observed V max was 22-0 pm 1 mol min−1 (mg protein)−1. Neither 1 nor 5 mM proline had any effect on enzyme activity, whilst glutamate was a very weak inhibitor." @default.
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- W2057691628 date "1995-07-01" @default.
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- W2057691628 title "Interaction between primary and secondary metabolism in Streptomyces coelicolor A3(2): role of pyrroline-5-carboxylate dehydrogenase" @default.
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- W2057691628 doi "https://doi.org/10.1099/13500872-141-7-1739" @default.
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