Mutational, proteomic and metabolomic analysis of a plant growth promoting copper-resistant Pseudomonas spp.

Kefeng Li, Ramana R. Pidatala, Wusirika Ramakrishna

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Pseudomonas sp. TLC6-6.5-4 is a multiple metal resistant plant growth-promoting bacteria isolated from copper-contaminated lake sediments. In this study, a comprehensive analysis of genes involved in copper resistance was performed by generating a library of transposon (Tn5) mutants. Two copper-sensitive mutants with significant reduction in copper resistance were identified: CSM1, a mutant disrupted in trpA gene (tryptophan synthase alpha subunit), and CSM2, a mutant disrupted in clpA gene (ATP-dependent Clp protease). Proteomic and metabolomic analyses were performed to identify biochemical and molecular mechanisms involved in copper resistance using CSM2 due to its lower minimum inhibitory concentration compared with CSM1 and the wild type. Proteomic analysis revealed that disruption of Clp protease gene up-regulated molecular chaperones and down-regulated the expression of enzymes related to tRNA modification, whereas metabolomic analysis showed that amino acid and oligosaccharide transporters that are part of ATP-binding cassette (ABC) transporters pathways were down-regulated. Further, copper stress altered metabolic pathways including the tricarboxylic acid cycle, protein absorption and glyoxylate metabolism.

Original languageEnglish
Pages (from-to)140-148
Number of pages9
JournalFEMS Microbiology Letters
Volume335
Issue number2
DOIs
Publication statusPublished - Oct 2012
Externally publishedYes

Keywords

  • Clp protease
  • Copper
  • Metabolomics
  • Proteomics
  • Transposon insertion

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