title: Cloning and comparison of the DNA encoding ammelide aminohydrolase and cyanuric acid amidohydrolase from three s-triazine-degrading bacterial strains.
abstract: DNA encoding the catabolism of the s-triazines ammelide and cyanuric acid was cloned from Pseudomonas sp. strain NRRLB-12228 and Klebsiella pneumoniae 99 with, as a probe, a 4.6-kb PstI fragment from a third strain, Pseudomonas sp. strain NRRLB-12227, which also encodes these activities. In strains NRRLB-12228 and 99 the ammelide aminohydrolase (trzC) and cyanuric acid amidohydrolase (trzD) genes are located on identical 4.6-kb PstI fragments which are part of a 12.4-kb DNA segment present in both strains. Strain NRRLB-12227 also carries this 12.4-kb DNA segment, except that a DNA segment of 0.8 to 1.85 kb encoding a third enzyme, ammeline aminohydrolase (trzB), has been inserted next to the ammelide aminohydrolase gene with the accompanying deletion of 1.1 to 2.15 kb of DNA. In addition, the s-triazine catabolic genes are flanked in strain NRRLB-12227 by apparently identical 2.2-kb segments that are not present in the other two strains and that seem to cause rearrangements in adjacent DNA.
authors.affiliation: Pesticide Degradation Laboratory, U.S. Department of Agriculture, Beltsville, Maryland 20705.
authors.forename: R W
authors.initials: RW
authors.lastname: Eaton
authors.forename: J S
authors.initials: JS
authors.lastname: Karns
mesh_terms: D000581:Amidohydrolases / Q000235:genetics* / Q000378:metabolism; D000619:Aminohydrolases / Q000235:genetics* / Q000378:metabolism; D003001:Cloning, Molecular; D005798:Genes, Bacterial; D007711:Klebsiella pneumoniae / Q000201:enzymology / Q000235:genetics*; D015394:Molecular Structure; D011549:Pseudomonas / Q000201:enzymology / Q000235:genetics*; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D014227:Triazines / Q000378:metabolism*
chemical_list: D014227:Triazines; D000581:Amidohydrolases; D000619:Aminohydrolases; C067140:ammelide aminohydrolase; C067141:cyanuric acid amidohydrolase; C004632:cyanuric acid; C067139:ammelide