Multiple antioxidant proteins protect Chlorobaculum tepidum against oxygen and reactive oxygen species

Hui Li, Sara Jubelirer, Amaya M. Garcia Costas, Niels Ulrik Frigaard, Donald A. Bryant

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The genome of the green sulfur bacterium Chlorobaculum (Cba.) tepidum, a strictly anaerobic photolithoautotroph, is predicted to encode more than ten genes whose products are potentially involved in protection from reactive oxygen species and an oxidative stress response. The encoded proteins include cytochrome bd quinol oxidase, NADH oxidase, rubredoxin oxygen oxidoreductase, several thiol peroxidases, alkyl hydroperoxide reductase, superoxide dismutase, methionine sulfoxide reductase, and rubrerythrin. To test the physiological functions of some of these proteins, ten genes were insertionally inactivated. Wild-type Cba. tepidum cells were very sensitive to oxygen in the light but were remarkably resistant to oxygen in the dark. When wild-type and mutant cells were subjected to air for various times under dark or light condition, significant decreases in viability were detected in most of the mutants relative to wild type. Treatments with hydrogen peroxide (H2O2), tert-butyl hydroperoxide (t-BOOH) and methyl viologen resulted in more severe effects in most of the mutants than in the wild type. The results demonstrated that these putative antioxidant proteins combine to form an effective defense against oxygen and reactive oxygen species. Reverse-transcriptase polymerase chain reaction studies showed that the genes with functions in oxidative stress protection were constitutively transcribed under anoxic growth conditions.

Original languageEnglish (US)
Pages (from-to)853-867
Number of pages15
JournalArchives of Microbiology
Volume191
Issue number11
DOIs
StatePublished - Nov 1 2009

Fingerprint

Reactive Oxygen Species
Antioxidants
Genes
Oxygen
Oxidative stress
Oxidative Stress
Chlorobi
Peroxiredoxins
tert-Butylhydroperoxide
Light
Peroxidases
Proteins
Paraquat
Cytochromes
Reverse Transcriptase Polymerase Chain Reaction
Sulfhydryl Compounds
Hydrogen Peroxide
Superoxide Dismutase
Polymerase chain reaction
RNA-Directed DNA Polymerase

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Biochemistry
  • Molecular Biology
  • Genetics

Cite this

Li, Hui ; Jubelirer, Sara ; Garcia Costas, Amaya M. ; Frigaard, Niels Ulrik ; Bryant, Donald A. / Multiple antioxidant proteins protect Chlorobaculum tepidum against oxygen and reactive oxygen species. In: Archives of Microbiology. 2009 ; Vol. 191, No. 11. pp. 853-867.
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Multiple antioxidant proteins protect Chlorobaculum tepidum against oxygen and reactive oxygen species. / Li, Hui; Jubelirer, Sara; Garcia Costas, Amaya M.; Frigaard, Niels Ulrik; Bryant, Donald A.

In: Archives of Microbiology, Vol. 191, No. 11, 01.11.2009, p. 853-867.

Research output: Contribution to journalArticle

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