title: Evidence that operons tcb, tfd, and clc encode maleylacetate reductase, the fourth enzyme of the modified ortho pathway.
abstract: The maleylacetate reductase from Pseudomonas sp. strain B13 functioning in the modified ortho pathway was purified and digested with trypsin. The polypeptides separated by high-performance liquid chromatography were sequenced. Alignments with the polypeptides predicted from the tfdF and tcbF genes located on plasmids pJP4 of the 2,4-dichlorophenoxyacetate-degrading Alcaligenes eutrophus JMP134 and pP51 of the 1,2,4-trichlorobenzene-degrading Pseudomonas sp. strain P51 as well as polypeptides predicted from the tftE gene located on the chromosome of the 2,4,5-trichlorophenoxyacetate-degrading Burkholderia cepacia AC1100 were obtained. In addition, the deduced protein sequence encoded by the nucleotide sequence downstream of clcD on plasmid pAC27 of the 3-chlorobenzoate-degrading Pseudomonas putida AC866 was tested for homology. Significant sequence similarities with the polypeptides encoded by the tfdF, tcbF, and tftE genes as well as the nucleotide sequence downstream of the clcD gene gave evidence that these genes might encode maleylacetate reductases. A NAD-binding motif in a beta alpha beta-element was detected.
authors.affiliation: Bergische Universität-Gesamthochschule Wuppertal, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Kasberg
authors.forename: D L
authors.initials: DL
authors.lastname: Daubaras
authors.forename: A M
authors.initials: AM
authors.lastname: Chakrabarty
authors.forename: D
authors.initials: D
authors.lastname: Kinzelt
authors.forename: W
authors.initials: W
authors.lastname: Reineke
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000378:metabolism; D000595:Amino Acid Sequence; D001673:Biodegradation, Environmental; D002722:Chlorobenzenes / Q000378:metabolism*; D002723:Chlorobenzoates / Q000378:metabolism*; D049308:Dioxygenases; D005798:Genes, Bacterial / Q000235:genetics*; D008969:Molecular Sequence Data; D009876:Operon / Q000235:genetics*; D010088:Oxidoreductases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D044925:Oxidoreductases Acting on CH-CH Group Donors; D010105:Oxygenases / Q000378:metabolism*; D010446:Peptide Fragments / Q000737:chemistry; D011549:Pseudomonas / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D017421:Sequence Analysis; D017386:Sequence Homology, Amino Acid
chemical_list: D002722:Chlorobenzenes; D002723:Chlorobenzoates; D010446:Peptide Fragments; C036427:3-chlorobenzoic acid; C009947:1,2,4-trichlorobenzene; D015084:2,4-Dichlorophenoxyacetic Acid; C018511:4-dichlorobenzene; D010088:Oxidoreductases; D010105:Oxygenases; D049308:Dioxygenases; C044173:chlorocatechol 1,2-dioxygenase; D044925:Oxidoreductases Acting on CH-CH Group Donors; C021530:maleylacetate reductase