title: Multiple forms of glutamine synthetase in Bacillus brevis AG 4.
abstract: Glutamine synthetase in Bacillus brevis AG 4, a Gram-positive spore forming bacteria, has been found to exist in multiple molecular forms. It was purified to electrophoretic homogeneity by single-step Blue Sepharose affinity chromatography. The native enzyme has a molecular weight of 600,000 with subunits of 50,000. The enzyme samples purified from different stages of growth differed in Mg2+ sensitivity and other kinetic properties. Four different enzyme samples selected on the basis of Mg2+ sensitivity showed distinct mobilities at pH 6.3 on PAGE using discontinuous buffer system. A correlation amongst Mg2+ sensitivity, electrophoretic mobility, and kinetic properties was highly suggestive of multiple forms of glutamine synthetase in Bacillus brevis arising due to modification.
authors.forename: R P
authors.initials: RP
authors.lastname: Tiwari
authors.forename: N K
authors.initials: NK
authors.lastname: Gaur
authors.forename: G K
authors.initials: GK
authors.lastname: Garg
mesh_terms: D001407:Bacillus / Q000201:enzymology* / Q000254:growth & development; D005974:Glutamate-Ammonia Ligase / Q000302:isolation & purification*; D007527:Isoenzymes / Q000302:isolation & purification; D007700:Kinetics
chemical_list: D007527:Isoenzymes; D005974:Glutamate-Ammonia Ligase