An NAD-linked dehydrogenase from Chlorella pyrenoidosa Chick catalyzing the conversion of l-proline to Delta(1)-pyrroline-5-carboxylic acid was partially purified. Delta(1)-Pyrroline-5-carboxylic acid was identified as the product by co-chromatography of it and its o-aminobenzaldehyde derivative with authentic compounds. The enzyme is NAD and l-proline specific and is not an oxidase; NADP is not inhibitory. The Michaelis constant for NAD is 0.08 mm and for proline is 0.73 mm.
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McNamer, A. D., & Stewart, C. R. (1974). Nicotinamide Adenine Dinucleotide-dependent Proline Dehydrogenase in Chlorella. Plant Physiology, 53(3), 440–444. https://doi.org/10.1104/pp.53.3.440