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- W58553685 abstract "As a first step in elucidating one molecular mechanism of adaptation to life at extreme temperatures, we purified and characterized the enzyme histidinol dehydrogenase (EC 1.1.1.23) from a number of bacilli whose growth temperatures range from 5 degrees t to 90 degrees C. The enzymes were purified by (NH4)2SO4 precipitation, ion-exchange chromatography on Sephadex, affinity chromatography on histamine- or histidine-Sepharose and preparative gradient gel electrophoresis. All had similar mol.wts. (29200), sedimentation coefficients (S20,w 2.56S), affinities for histidinol and NAD+ (Km = 48 micron and 0.2 mM respectively) and all had pH optima at 9.6. Marked differences were observed in stability with respect to temperature and the temperature at which the initial velocity for histidinol dehydrogenation was optimal. These optima range from 25 degrees C for the enzyme from the psychrophilic species through to 41 degrees C for the mesophiles to 85-92 degrees C for the extreme thermophiles. It is concluded that the ability of the enzymes to operate at their various optimum temperatures is an intrinsic property of their amino acid sequences." @default.
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- W58553685 date "1977-08-01" @default.
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- W58553685 title "Purification and properties of histidinol dehydrogenases from psychrophilic, mesophilic and thermophilic bacilli" @default.
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- W58553685 doi "https://doi.org/10.1042/bj1650247" @default.
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