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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Pantothenases from pseudomonads produce either pantoyl lactone or pantoic acid.

A pseudomonad was separated having a pantothenase that produced beta-alanine and pantoic acid. The pantothenase from an old strain, Pseudomonas fluorescens UK-1, was shown to produce beta-alanine and pantoyl lactone. The pantoic acid-producing pantothenase was characterized and compared with the pantothenase from the strain UK-1. The Mr was 240,000; it apparently consists of four subunits. The Km value for pantothenate is 3 mM. The enzymic activity is affected by an ionizable group of pK 8.4, the enzyme is active at higher pH, and V but not Km is affected by pH. This pantothenase is not inhibited by di-isopropyl phosphorofluoridate or phenylmethanesulphonyl fluoride, unlike the enzyme from the strain UK-1. Both pantothenases are inhibited by m-aminophenylboronic acid, oxalate, oxaloacetate and Cl- ions. The pantoic acid-producing pantothenase is inhibited also by SO4(2-) ions. The strong inhibitions by many compounds make this pantothenase unsuitable for the assay of pantothenic acid.[1]


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