Object's details: Pseudomonas putida AlkA and AlkB Proteins Comprise Different Defense Systems for the Repair of Alkylation Damage to DNA – In Vivo, In Vitro, and In Silico Studies

Provider:Repozytorium Instytutu Biochemii i Biofizyki Polskiej Akademii Nauk

Description

Title:
Pseudomonas putida AlkA and AlkB Proteins Comprise Different Defense Systems for the Repair of Alkylation Damage to DNA – In Vivo, In Vitro, and In Silico Studies
Creator:
Mielecki, Damian;
Saumaa, Signe;
Wrzesiński, Michał;
Maciejewska, Agnieszka M.;
Żuchniewicz, Karolina;
Sikora, Anna;
Piwowarski, Jan;
Nieminuszczy, Jadwiga;
Kivisaar, Maia;
Grzesiuk, Elzbieta
Description:
Alkylating agents introduce cytotoxic and/or mutagenic lesions to DNA bases leading to induction of adaptive (Ada) response, a mechanism protecting cells against deleterious effects of environmental chemicals. In Escherichia coli, the Ada response involves expression of four genes: ada, alkA, alkB, and aidB. In Pseudomonas putida, the organization of Ada regulon is different, raising questions regarding regulation of Ada gene expression. The aim of the presented studies was to analyze the role of AlkA glycosylase and AlkB dioxygenase in protecting P. putida cells against damage to DNA caused by alkylating agents. The results of bioinformatic analysis, of survival and mutagenesis of methyl methanesulfonate (MMS) or N-methyl-N’-nitro-N-nitrosoguanidine (MNNG) treated P. putida mutants in ada, alkA and alkB genes as well as assay of promoter activity revealed diverse roles of Ada, AlkA and AlkB proteins in protecting cellular DNA against alkylating agents. We found AlkA protein crucial to abolish the cytotoxic but not the mutagenic effects of alkylans since: (i) the mutation in the alkA gene was the most deleterious for MMS/MNNG treated P. putida cells, (ii) the activity of the alkA promoter was Ada-dependent and the highest among the tested genes. P. putida AlkB (PpAlkB), characterized by optimal conditions for in vitro repair of specific substrates, complementation assay, and M13/MS2 survival test, allowed to establish conservation of enzymatic function of P. putida and E. coli AlkB protein. We found that the organization of P. putida Ada regulon differs from that of E. coli. AlkA protein induced within the Ada response is crucial for protecting P. putida against cytotoxicity, whereas Ada prevents the mutagenic action of alkylating agents. In contrast to E. coli AlkB (EcAlkB), PpAlkB remains beyond the Ada regulon and is expressed constitutively. It probably creates a backup system that protects P. putida strains defective in other DNA repair systems against alkylating agents of exo- and endogenous origin.
Object availability:
free access
Date:
2013.10.02
Type:
Article;
PeerReviewed
Language:
eng
Format:
application/pdf;
application/zip
Relation: http://eprints.ibb.waw.pl/578
Subject:
QH301 Biology;
QH426 Genetics;
QR Microbiology
Identifier: http://eprints.ibb.waw.pl/578/1/Pseudomonas_putida_PLoS_ONE.pdf ;http://eprints.ibb.waw.pl/578/7/813180_1.zip ;
Mielecki, Damian and Saumaa, Signe and Wrzesiński, Michał and Maciejewska, Agnieszka M. and Żuchniewicz, Karolina and Sikora, Anna and Piwowarski, Jan and Nieminuszczy, Jadwiga and Kivisaar, Maia and Grzesiuk, Elzbieta (2013) Pseudomonas putida AlkA and AlkB Proteins Comprise Different Defense Systems for the Repair of Alkylation Damage to DNA – In Vivo, In Vitro, and In Silico Studies. PloS one, 8 (10). e76198. ISSN 1932-6203
Data provider:
Repozytorium Instytutu Biochemii i Biofizyki Polskiej Akademii Nauk

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Object's details: Pseudomonas putida AlkA and AlkB Proteins Comprise Different Defense Systems for the Repair of Alkylation Damage to DNA – In Vivo, In Vitro, and In Silico Studies

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