Mutants of the obligate methylothroph Methylobacillus flagellatum KT defective in genes of the ribulose monophosphate cycle of formaldehyde fixation |
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Authors: | L V Kletsova E S Chibisova Y D Tsygankov |
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Institution: | (1) The Biological Laboratory, University of Kent at Canterbury, CT2 7NJ Canterbury, Kent, UK |
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Abstract: | Pseudomonas cepacia MBA4 able to utilize monobromoacetic acid as a sole source of carbon and energy was isolated from soil by enrichment culture. In batch culture the ability to utilize the substrate was conferred by a single halidohydrolase-type dehalogenase which demonstrated a high activity towards the enrichment substrate. The purified enzyme, designated as dehalogenase IVa by activity-stain polyacrylamide gel electrophoresis, had a relative molecular weight of 45,000 and was comprised of two electrophoretically identical subunits with relative molecular weights of 23,000. Dehalogenase IVa demonstrated isomer specificity, being active towards the L-isomer of 2-monochloropropionic acid only. The significance of activity-stain polyacrylamide gel electrophoresis in characterizing dehalogenases and their ubiquitous distribution among bacterial genera are discussed.Abbreviations MCA
Monochloroacetic acid
- DCA
dichloroacetic acid
- MBA
monobromoacetic acid
- 2MPCA
2-monochloropropionic acid
- 2MBPA
2-monobromopropionic acid |
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Keywords: | Dehalogenase Purification Monobromoacetic acid |
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