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

Inactivation and proteolysis of heat-sensitive adenylate kinase of Escherichia coli CR341 T28.

Adenylate kinase from Escherichia coli K12 (strains CR341 and CR341 T28, a temperature-sensitive mutant) was purified by a two-step chromatographic procedure. Denaturation by heat above 60 degrees C of pure or crude preparations of adenylate kinase from both strains of bacteria was shown to be "reversible" if the enzyme was converted to the random coiled state by guanidinium chloride after heat treatment. Like other small monomeric proteins, adenylate kinase refolded rapidly to the native active state by dilution of guanidinium chloride. Adenylate kinase from the mutant strain was irreversibly inactivated by exposure of crude extracts at 40 degrees C. This inactivation is due to proteolysis which follows thermal denaturation (or transconformation) of mutant adenylate kinase at 40 degrees C. ATP, P1, P5-di(adenosine 5')-pentaphosphate, and anti-adenylate kinase antibodies protected the thermosensitive adenylate kinase in crude extracts against denaturation and proteolysis at 40 degrees C.[1]


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