1887

Abstract

f. sp. was shown to oxidize sulphate via substrate phosphorylation involving adenylylsulphate (APS) reductase, ADP-sulphurylase and adenylate kinase. APS reductase was purified 200-fold and shown to be a flavoprotein of molecular weight 1·8 × 10, containing 1 mol flavin adenine dinucleotide (FAD), 4–6 mol non-haem iron and 6–8 mol labile sulphide (mol enzyme). Substrate inhibition of the enzyme was observed when the AMP concentration was above 2 m. ADP-sulphurylase purified free of adenylate kinase had an apparent value for APS of 0·25 m, which increased with decreasing concentrations of phosphate.

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1983-05-01
2021-10-20
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