ISSN:
1432-2099
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Physics
Notes:
Abstract In order to examine radiation-induced proteins in an extremely radioresistant bacterium, Deinococcus radiodurans R 1, changes in cellular proteins after γ-irradiation were analysed by two-dimensional gel electrophoresis and silver staining. Nine proteins (190, 120, 87, 60, 58, 52, 46, 41 and 41 kDa) were increased (or appeared) and more than 13 proteins diminished after γ-irradiation at 6 kGy. Increase of eight proteins (except for 190-kDa protein) was prevented when the cells were irradiated in the presence of chloramphenicol. Three proteins, 87, 60 and 46 kDa, continued to be synthesized during post-irradiation incubation, and the amounts of these proteins increased with higher doses in a range of 1 – 12 kGy. Changes in the amount of proteins after irradiation in the R 1 strain were compared with those in a moderately radioresistant mutant (rec 1) and in a highly radiosensitive mutant (rec30). These three proteins were increased in both R 1 and rec 1, but not in rec 30, suggesting that they are characteristic for radioresistant strains. In addition, from the microsequence analysis, the 46-kDa protein was found to be homologous to the EF-Tu protein of Escherichia coli, whereas the remarkable homologous sequence to the N-terminal of the 60-kDa protein was not found among the known proteins.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s004110050015
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