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Glucose and related catabolite repressors are powerful inhibitors of pKM101-enhanced UV mutagenesis in Escherichia coli


Ambrose, M and MacPhee, DG, Glucose and related catabolite repressors are powerful inhibitors of pKM101-enhanced UV mutagenesis in Escherichia coli, Mutation Research, 422, (1) pp. 107-12. ISSN 0027-5107 (1998) [Refereed Article]

Copyright Statement

Copyright 1998 Elsevier B.V.

DOI: doi:10.1016/S0027-5107(98)00179-1


When stationary phase Escherichia coli K12 trp (amber) cells were exposed to UV doses ranging from 180-540 J m(-2), we found that we could not recover any induced Trp+ revertants unless the irradiated cultures were first supplied with the Muc+ mutation-enhancing IncP plasmid pKM101 (by conjugation). We also found that the numbers of UV-induced Trp+ revertants recovered from pKM101+ cultures varied quite dramatically depending upon which of several commonly-used carbon sources were present in the post-irradiation plating medium, e.g., there were always significantly fewer revertants on minimal glucose plates than on minimal glycerol plates. More importantly, there were also fewer UV-induced revertants on glycerol + glucose plates than on 'glycerol-only' plates. We then tested two glucose-related compounds which are known to depress intracellular cyclic AMP (cAMP) levels even more effectively than glucose (glucose-6-phosphate and the non-utilisable methyl-alpha-D-glucopyranoside) and found that they too were able to exert powerfully antimutagenic effects in UV-treated pKM101-containing bacteria. Taken together, these results provide strong additional support for our working hypothesis that at least one component of the mutational pathway which operates in UV-irradiated pKM101-containing cells is extremely sensitive to classical cAMP-mediated catabolite repression.

Item Details

Item Type:Refereed Article
Keywords:SOS repair, pKM101, Ultraviolet light, catabolite repression
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Anthropological genetics
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Ambrose, M (Dr Mark Ambrose)
ID Code:87164
Year Published:1998
Web of Science® Times Cited:5
Deposited By:Medicine
Deposited On:2013-11-08
Last Modified:2013-12-05

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