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Article (Scientific journals)
Analysis of the Mutations Induced in the E. Coli Lac Z Gene by a Psoralen Analog
Matroule, J. Y.; Collet, M.; Boiteux, S. et al.
1997In Journal of Photochemistry and Photobiology B: Biology, 41 (1-2), p. 36-44
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Abstract :
[en] A psoralen in which intracyclic oxygen atoms were replaced by sulfur (7H-thieno [3,2-g]-[1]-[benzothiopyran-7-one) [PSO(S-S)]) was recently synthesized and its photobiological properties were investigated. M13mp19 DNA photosensitization mediated by PSO (S-S) followed by transfection into competent E. coli gave rise to a very low phage progeny showing the high aptitude of this compound to modify DNA. In order to characterize the role of oxidative damages in the photosensitized reaction mediated by PSO(S-S), plasmid bearing the gene encoding the formamidopyrimidine DNA glycosylase (Fpg) under the control of the inducible lac Z promoter was transfected in E. coli. Overexpression of Fpg was induced by addition of isopropyl-beta-D-thio-galactopyranoside (IPTG) to the cells and monitored by western blot analysis. Fpg overexpression did not influence the rate of M13mp19 DNA photoinactivation by PSO(S-S) neither the mutation frequency measured by the expression of beta-galactosidase encoded by the lac Z gene beared by M13mp19. Analysis of the mutation patterns recorded with or without Fpg overexpression showed that several G to T transversions due to oxidative damages were repaired by Fpg. These data show that oxidative DNA damages generated during PSO(S-S) photosensitization have only limited biological implications measured in terms of DNA photoinactivation.
Disciplines :
Chemistry
Author, co-author :
Matroule, J. Y.
Collet, M.
Boiteux, S.
Piette, Jacques ;  Université de Liège - ULiège > Département des sciences de la vie > Virologie - Immunologie
Language :
English
Title :
Analysis of the Mutations Induced in the E. Coli Lac Z Gene by a Psoralen Analog
Publication date :
November 1997
Journal title :
Journal of Photochemistry and Photobiology B: Biology
ISSN :
1011-1344
Publisher :
Elsevier Science, Lausanne, Switzerland
Volume :
41
Issue :
1-2
Pages :
36-44
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 June 2011

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