期刊
GENOME BIOLOGY AND EVOLUTION
卷 4, 期 2, 页码 184-198出版社
OXFORD UNIV PRESS
DOI: 10.1093/gbe/evr137
关键词
horizontal gene transfer; biodegradation; enzyme evolution; pentachlorophenol hydroxylase; tetrachlorohydroquinone dehalogenase; tetrachlorobenzoquinone reductase
资金
- National Institutes of Health [GM078554]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
Sphingobium chlorophenolicum Strain L-1 can mineralize the toxic pesticide pentachlorophenol (PCP). We have sequenced the genome of S. chlorophenolicum Strain L-1. The genome consists of a primary chromosome that encodes most of the genes for core processes, a secondary chromosome that encodes primarily genes that appear to be involved in environmental adaptation, and a small plasmid. The genes responsible for degradation of PCP are found on chromosome 2. We have compared the genomes of S. chlorophenolicum Strain L-1 and Sphingobium japonicum, a closely related Sphingomonad that degrades lindane. Our analysis suggests that the genes encoding the first three enzymes in the PCP degradation pathway were acquired via two different horizontal gene transfer events, and the genes encoding the final two enzymes in the pathway were acquired from the most recent common ancestor of these two bacteria.
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