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Guionet A, Joubert-Durigneux V, Packan D, Cheype C, Garnier JP, David F, Zaepffel C, Leroux RM, Teissié J, Blanckaert V. Effect of nanosecond pulsed electric field on Escherichia coli
in water: inactivation and impact on protein changes. J Appl Microbiol 2014; 117:721-8. [DOI: 10.1111/jam.12558] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 05/23/2014] [Accepted: 05/29/2014] [Indexed: 11/29/2022]
Affiliation(s)
- A. Guionet
- VERI; Chemin de la Digue; Maisons Lafitte France
- CNRS UMR5089 - IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
| | | | - D. Packan
- ONERA; DMPH; Chemin de la Hunière; Palaiseau France
| | - C. Cheype
- CERPEM; Laval Mayenne Technopole; Laval France
| | | | - F. David
- VERI; Chemin de la Digue; Maisons Lafitte France
| | - C. Zaepffel
- ONERA; DMPH; Chemin de la Hunière; Palaiseau France
| | - R.-M. Leroux
- Mer, Molécules, Santé; IUML-FR 3473 CNRS, Université du Maine; IUT de Laval; Département Génie Biologique, Laval France
| | - J. Teissié
- CNRS UMR5089 - IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
| | - V. Blanckaert
- Mer, Molécules, Santé; IUML-FR 3473 CNRS, Université du Maine; IUT de Laval; Département Génie Biologique, Laval France
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Tirumalai MR, Rastogi R, Zamani N, O’Bryant Williams E, Allen S, Diouf F, Kwende S, Weinstock GM, Venkateswaran KJ, Fox GE. Candidate genes that may be responsible for the unusual resistances exhibited by Bacillus pumilus SAFR-032 spores. PLoS One 2013; 8:e66012. [PMID: 23799069 PMCID: PMC3682946 DOI: 10.1371/journal.pone.0066012] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 04/30/2013] [Indexed: 11/18/2022] Open
Abstract
The spores of several Bacillus species, including Bacillus pumilus SAFR-032 and B. safensis FO-36b, which were isolated from the spacecraft assembly facility at NASA's Jet Propulsion Laboratory, are unusually resistant to UV radiation and hydrogen peroxide. In order to identify candidate genes that might be associated with these resistances, the whole genome of B. pumilus SAFR-032, and the draft genome of B. safensis FO-36b were compared in detail with the very closely related type strain B. pumilus ATCC7061(T). 170 genes are considered characteristic of SAFR-032, because they are absent from both FO-36b and ATCC7061(T). Forty of these SAFR-032 characteristic genes are entirely unique open reading frames. In addition, four genes are unique to the genomes of the resistant SAFR-032 and FO-36b. Fifty three genes involved in spore coat formation, regulation and germination, DNA repair, and peroxide resistance, are missing from all three genomes. The vast majority of these are cleanly deleted from their usual genomic context without any obvious replacement. Several DNA repair and peroxide resistance genes earlier reported to be unique to SAFR-032 are in fact shared with ATCC7061(T) and no longer considered to be promising candidates for association with the elevated resistances. Instead, several SAFR-032 characteristic genes were identified, which along with one or more of the unique SAFR-032 genes may be responsible for the elevated resistances. These new candidates include five genes associated with DNA repair, namely, BPUM_0608 a helicase, BPUM_0652 an ATP binding protein, BPUM_0653 an endonuclease, BPUM_0656 a DNA cytosine-5- methyltransferase, and BPUM_3674 a DNA helicase. Three of these candidate genes are in immediate proximity of two conserved hypothetical proteins, BPUM_0654 and BPUM_0655 that are also absent from both FO-36b and ATCC7061(T). This cluster of five genes is considered to be an especially promising target for future experimental work.
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Affiliation(s)
- Madhan R. Tirumalai
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
| | - Rajat Rastogi
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
| | - Nader Zamani
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
| | - Elisha O’Bryant Williams
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
| | - Shamail Allen
- Department of Biology, Texas Southern University, Houston, Texas, United States of America
| | - Fatma Diouf
- Department of Biology, Texas Southern University, Houston, Texas, United States of America
| | - Sharon Kwende
- Department of Biology, Texas Southern University, Houston, Texas, United States of America
| | - George M. Weinstock
- The Genome Institute, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Kasthuri J. Venkateswaran
- Biotechnology & Planetary Protection Group, NASA Jet Propulsion Laboratories, California Institute of Technology, Pasadena, California, United States of America
| | - George E. Fox
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
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Abstract
Deinococcus radiodurans is a robust bacterium best known for its capacity to repair massive DNA damage efficiently and accurately. It is extremely resistant to many DNA-damaging agents, including ionizing radiation and UV radiation (100 to 295 nm), desiccation, and mitomycin C, which induce oxidative damage not only to DNA but also to all cellular macromolecules via the production of reactive oxygen species. The extreme resilience of D. radiodurans to oxidative stress is imparted synergistically by an efficient protection of proteins against oxidative stress and an efficient DNA repair mechanism, enhanced by functional redundancies in both systems. D. radiodurans assets for the prevention of and recovery from oxidative stress are extensively reviewed here. Radiation- and desiccation-resistant bacteria such as D. radiodurans have substantially lower protein oxidation levels than do sensitive bacteria but have similar yields of DNA double-strand breaks. These findings challenge the concept of DNA as the primary target of radiation toxicity while advancing protein damage, and the protection of proteins against oxidative damage, as a new paradigm of radiation toxicity and survival. The protection of DNA repair and other proteins against oxidative damage is imparted by enzymatic and nonenzymatic antioxidant defense systems dominated by divalent manganese complexes. Given that oxidative stress caused by the accumulation of reactive oxygen species is associated with aging and cancer, a comprehensive outlook on D. radiodurans strategies of combating oxidative stress may open new avenues for antiaging and anticancer treatments. The study of the antioxidation protection in D. radiodurans is therefore of considerable potential interest for medicine and public health.
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