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The enzyme l-serine–glyoxylate aminotransferase (SGAT) from Hyphomicrobium methylovorum is a PLP-containing enzyme that catalyzes the conversion of l-serine and glyoxylate to hydroxypyruvate and glycine. The cloned enzyme expressed in Escherichia coli is isolated as a mixture of the E:PLP and E:PMP forms. The PLP form of the enzyme has a maximum absorbance at 413 nm.Uv–visible spectra of SGAT were...
Dihydropteroate synthase (DHPS) catalyzes the formation of dihydropteroate and Mg-pyrophosphate from 6-hydroxymethyl-7,8-dihydropterin diphosphate and para-aminobenzoic acid. The Bacillus anthracis DHPS is intrinsically resistant to sulfonamides. However, using a radioassay that monitors the dihydropteroate product, the enzyme was inhibited by the same sulfonamides. A continuous spectrophotometric...
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