1887

Abstract

Summary: -Glutamine : -fructose-6-phosphate amidotransferase (‘glucosamine synthase’, EC 5.3.1.19) from MRE 600 was purified at least 75-fold. It catalysed the formation of 21·1 μmol glucosamine 6-phosphate (mg protein)in 30 min at 37°C. Its molecular weight, estimated by gel filtration, was about 90000 and it was inhibited by thiol group reagents. Anticapsin, the C-terminal amino acid of the dipeptide antibiotic bacilysin, and to a lesser extent bacilysin itself, inhibited glucosamine synthase activity. Kinetic studies indicated that the inhibition was non-competitive with respect to fructose 6-phosphate as substrate but partly competitive with respect to -glutamine. Incubation of the enzyme with anticapsin brought about a time-dependent and irreversible inhibition. It is suggested that anticapsin behaves as a glutamine analogue and that a reaction of its epoxide group with a thiol group of glucosamine synthase results in its linkage to the enzyme by a covalent bond.

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/content/journal/micro/10.1099/00221287-131-2-265
1985-02-01
2019-12-05
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http://instance.metastore.ingenta.com/content/journal/micro/10.1099/00221287-131-2-265
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