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Appl. Environ. Microbiol., Sep 1995, 3274-3281, Vol 61, No. 9
RR Fulthorpe, C McGowan, OV Maltseva, WE Holben and JM Tiedje
DNA from 32 2,4-dichlorophenoxyacetic acid (2,4-D)-degrading bacteria from
diverse locations was probed with the first three genes of the well-known
2,4-D degradation pathway found in Alcaligenes eutrophus JMP134(pJP4). The
majority of strains did not show high levels of homology to the first three
genes of the 2,4-D degradation pathway, tfdA, -B, and -C. Most strains
showed combinations of tfdA-, B-, and C- like elements that exhibited
various degrees of homology to the gene probes. Strains having the same
genomic fingerprints (as determined by repetitive extragenic palindromic
PCR) exhibited the same hybridization pattern regardless of the geographic
origin of the strain, with the exception of a strain isolated from Puerto
Rico. This strain had the same genomic fingerprint as that of numerous
other strains in the collection but differed in its hybridization against
the tfdA gene probe. Members of the beta subdivision of the Proteobacteria
class, specifically Alcaligenes, Burkholderia, and Rhodoferax species,
carried DNA fragments with 60% or more sequence similarity to tfdA of pJP4,
and most carried fragments showing at least 60% homology to tfdB. However,
many strains did not hybridize with tfdC, although they exhibited
chlorocatechol dioxygenase activity. Members of the alpha subdivision of
the Proteobacteria class, mostly of the genus Sphingomonas, did not
hybridize to either tfdA or tfdC, but some hybridized at low stringency to
tfdB. The data suggest that extensive interspecies transfer of a variety of
homologous degradative genes has been involved in the evolution of
2,4-D-degrading bacteria.
Copyright © 1995, American Society for Microbiology
2,4-Dichlorophenoxyacetic acid-degrading bacteria contain mosaics of catabolic genes
Center for Microbial Ecology, Michigan State University, East Lansing 48824-1101, USA.
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