Sphingomonas herbicidovorans MH: a versatile phenoxyalkanoic acid herbicide degrader |
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Authors: | H P E Kohler |
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Institution: | (1) EAWAG, Swiss Federal Institute for Environmental Sciences and Technology, Ueberlandstrasse 133, CH-8600 Dübendorf, Switzerland, CH |
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Abstract: | Sphingomonas herbicidovorans MH was isolated from a dichlorprop-degrading soil column. It is able to grow on phenoxyalkanoic acid herbicides, such as
mecoprop, dichlorprop, 2,4-D, MCPA, and 2,4-DB. Strain MH utilizes both enantiomers of the chiral herbicides mecoprop and
dichlorprop as sole carbon and energy sources. Enantiomer-specific uptake systems are responsible for transporting the acidic
substrates across the cell membrane. Catabolism is initiated by two enantiomer-specific α-ketoglutarate-dependent dioxygenases
that catalyze the cleavage of the ether bond of the respective enantiomer to yield the corresponding phenol and pyruvate.
Therefore selective degradation of the enantiomers of mecoprop and dichlorprop by strain MH is not only due to enantioselective
catabolism but also to enantioselective transport.
Received 07 May 1999/ Accepted in revised form 11 August 1999 |
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Keywords: | : Sphingomonas herbicidovorans MH phenoxyalkanoic acid herbicides enantioselectivity transport α -ketoglutarate-dependent dioxygenase |
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