Divergent evolution of chloroplast-type ferredoxins

The TOL plasmid PWWO of Pseudomonas putida encodes a set of enzymes required for the oxidation of toluene to Krebs cycle intermediates. The structural genes for these enzymes are encoded in two operons which comprise the xylCMABN and xylXYZLTEGFJQKIH genes, respectively. The function of the xylT gen...

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Bibliographic Details
Published in:FEBS letters 1991-07, Vol.285 (1), p.85-88
Main Authors: Harayama, Shigeaki, Polissi, Alessandra, Rekik, Monique
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Bacterial Proteins
Base Sequence
Biological and medical sciences
Biological Evolution
Chloroplast-type
Chloroplasts
Ferredoxin
Ferredoxins - chemistry
Ferredoxins - genetics
Fundamental and applied biological sciences. Psychology
Gene Frequency
Genetics of eukaryotes. Biological and molecular evolution
Molecular Sequence Data
NAH plasmid
Naphthalenes - metabolism
Plasmids - genetics
Protein evolution
Pseudomonas - genetics
Pseudomonas putida
Sequence Alignment
Sequence Homology, Nucleic Acid
TOL plasmid
Toluene - metabolism
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Summary:The TOL plasmid PWWO of Pseudomonas putida encodes a set of enzymes required for the oxidation of toluene to Krebs cycle intermediates. The structural genes for these enzymes are encoded in two operons which comprise the xylCMABN and xylXYZLTEGFJQKIH genes, respectively. The function of the xylT gene has not yet been identified. The nucleotide sequence of xylT was determined in this study and putative gene product was shown to contain a sequence characteristic for chloroplast-type ferredoxins. The nahT gene, the homologue of xylT, present on NAH plasmid NAH7 encoding naphtalene-degrading enzymes, was also sequenced. The sequence conservation between xylT and nahT strongly suggests that both gene products have some physiological function. Chloroplast-type ferredoxins have been discovered in photosynthetic organisms (plants, algae, cyanobacteria and Rhodobacter) and Halobacterium species. Furthermore, chloroplast-type ferredoxin-like sequences have been found in the electron-transfer components of some oxygenases, The sequences of XylT and NahT were compared with those of the previously identified chloroplast-type ferredoxins, in order to examine their evolutionary relationships.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(91)80730-Q