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- W2022266878 abstract "The effects of ionizing radiation on glutamate dehydrogenase and on fluorescein isothiocyanate--tagged glutamate dehydrogenase were analyzed by target theory. Enzymatic activity, fluorescence, and the survival of the 56,000-dalton monomer subunit were determined on frozen samples irradiated at -135 degrees C and on lyophilized samples irradiated at either -135 degrees C or +30 degrees C. The effects of temperature were the same for all three parameters. Enzymatic activity was lost after small doses of high-energy electrons, whereas fluorescence and monomer subunits survived much larger doses of radiation. Target analysis revealed that the functional unit size for enzymatic activity was the hexamer, confirming both the earlier radiation study and conventional biochemical analyses. Target sizes obtained from fluorescence and subunit structure measurements were close to that of the monomer. These results indicate that the primary ionization caused by electron bombardment results in damage to a single polypeptide strand and that there is no massive transfer of radiation energy to other units in the hexamer. The large target size observed for enzymatic activity appears to be a structural requirement for the simultaneous presence of six intact subunits rather than the result of the spread of energy from the initial site to adjacent chains with consequent damage to other subunits." @default.
- W2022266878 created "2016-06-24" @default.
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- W2022266878 date "1983-11-11" @default.
- W2022266878 modified "2023-09-24" @default.
- W2022266878 title "Radiation Inactivation of Glutamate Dehydrogenase Hexamer: Lack of Energy Transfer Between Subunits" @default.
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- W2022266878 doi "https://doi.org/10.1126/science.6635656" @default.
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