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- W80854315 abstract "Abstract It has been found that the most widely used method for the extraction of guanosine 5′-diphosphate, 3′-diphosphate (ppGpp) from E. coli (1 M formic acid at 0°) results in its in vitro degradation to ppGp and GDP. A comparison with several other extraction procedures indicated that this breakdown is due to the low pH of the reagents used during extraction. This degradation can largely be prevented by using a new extraction technique which involves freezing and thawing of the cells in the presence of lysozyme at a neutral pH followed by treatment with deoxycholate. With this method it is possible to recover from three to five times as much ppGpp from both unstarved and amino acid starved stringent strains of E. coli as compared with the most widely used formic acid procedure. Consequently, it will be necessary to reevaluate the ppGpp values obtained from cells when formic acid or other low pH reagents were used during extraction." @default.
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- W80854315 date "1978-10-01" @default.
- W80854315 modified "2023-09-27" @default.
- W80854315 title "The extraction of guanosine 5′-diphosphate, 3′-diphosphate (ppGpp) from Escherichia coli using low pH reagents: A reevaluation" @default.
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- W80854315 doi "https://doi.org/10.1016/0006-291x(78)91685-6" @default.
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