Comparative action of glyphosate as a trigger of energy drain in eubacteria
| Autor: | A Berry, R S Fischer, Roy A. Jensen, C G Gaines |
|---|---|
| Rok vydání: | 1986 |
| Předmět: |
Metabolite
Glycine Shikimic Acid Bacillus subtilis Biology medicine.disease_cause Microbiology chemistry.chemical_compound Bacterial Proteins Species Specificity Transferases Escherichia coli medicine Aromatic amino acids Amino Acids Molecular Biology chemistry.chemical_classification Alkyl and Aryl Transferases Shikimic acid biology.organism_classification Amino acid chemistry Biochemistry Pseudomonas aeruginosa 3-Phosphoshikimate 1-Carboxyvinyltransferase Growth inhibition Energy Metabolism Research Article |
| Zdroj: | Journal of Bacteriology. 168:1147-1154 |
| ISSN: | 1098-5530 0021-9193 |
| DOI: | 10.1128/jb.168.3.1147-1154.1986 |
| Popis: | Escherichia coli, Bacillus subtilis, and Pseudomonas aeruginosa, each possessing a 5-enolpyruvylshikimate 3-phosphate synthase that is sensitive to inhibition by glyphosate [N-(phosphonomethyl)glycine], provide a good cross-section of organisms exemplifying the biochemical diversity of the aromatic pathway targeted by this potent antimicrobial compound. The pattern of growth inhibition, the alteration in levels of aromatic-pathway enzymes, and the accumulation of early-pathway metabolites after the addition of glyphosate were distinctive for each organism. Substantial intracellular shikimate-3-phosphate accumulated in response to glyphosate treatment in all three organisms. Both E. coli and P. aeruginosa, but not B. subtilis, accumulated near-millimolar levels of shikimate-3-phosphate in the culture medium. Intracellular backup of common-pathway precursors of shikimate-3-phosphate was substantial in B. subtilis, moderate in P. aeruginosa, and not detectable in E. coli. The full complement of aromatic amino acids prevented growth inhibition and metabolite accumulation in E. coli and P. aeruginosa where amino acid end products directly control early-pathway enzyme activity. In contrast, the initial prevention of growth inhibition in the presence of aromatic amino acids in B. subtilis was succeeded by progressively greater growth inhibition that correlated with rapid metabolite accumulation. In B. subtilis glyphosate can decrease prephenate concentrations sufficiently to uncouple the sequentially acting loops of feedback inhibition that ordinarily link end product excess to feedback inhibition of 3-deoxy-D-arabino-heptulosonate 7-phosphate synthase by prephenate. The consequential unrestrained entry is an energy-rich substrates into the aromatic pathway, even in the presence of aromatic amino acid end products, is an energy drain that potentially accounts for the inability of end products to fully reverse glyphosate inhibition in B. subtilis. Even in E. coli after glyphosate inhibition and metabolite accumulation were allowed to become fully established, a transient period where end products were capable of only partial reversal of growth inhibition occurred. The distinctive metabolism produced by dissimilation of different carbon sources also profound effects upon glyphosate sensitivity. |
| Databáze: | OpenAIRE |
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