Analysis of Pseudomonas putida alkane-degradation gene clusters and flanking insertion sequences: evolution and regulation of the alk genes

Microbiology. 2001 Jun;147(Pt 6):1621-1630. doi: 10.1099/00221287-147-6-1621.


The Pseudomonas putida GPo1 (commonly known as Pseudomonas oleovorans GPo1) alkBFGHJKL and alkST gene clusters, which encode proteins involved in the conversion of n-alkanes to fatty acids, are located end to end on the OCT plasmid, separated by 9.7 kb of DNA. This DNA segment encodes, amongst others, a methyl-accepting transducer protein (AlkN) that may be involved in chemotaxis to alkanes. In P. putida P1, the alkBFGHJKL and alkST gene clusters are flanked by almost identical copies of the insertion sequence ISPpu4, constituting a class 1 transposon. Other insertion sequences flank and interrupt the alk genes in both strains. Apart from the coding regions of the GPo1 and P1 alk genes (80-92% sequence identity), only the alkB and alkS promoter regions are conserved. Competition experiments suggest that highly conserved inverted repeats in the alkB and alkS promoter regions bind ALKS:

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkanes / metabolism*
  • Bacterial Proteins / genetics*
  • Bacterial Proteins / metabolism
  • Base Sequence
  • Chemotaxis
  • Cytochrome P-450 CYP4A
  • Cytochrome P-450 Enzyme System / genetics*
  • Cytochrome P-450 Enzyme System / metabolism
  • DNA Transposable Elements*
  • Evolution, Molecular
  • Gene Expression Regulation, Bacterial
  • Mixed Function Oxygenases / genetics*
  • Mixed Function Oxygenases / metabolism
  • Molecular Sequence Data
  • Multigene Family*
  • Promoter Regions, Genetic
  • Pseudomonas putida / genetics*
  • Pseudomonas putida / metabolism
  • Repetitive Sequences, Nucleic Acid
  • Sequence Analysis, DNA
  • Sequence Homology, Nucleic Acid


  • Alkanes
  • Bacterial Proteins
  • DNA Transposable Elements
  • Cytochrome P-450 Enzyme System
  • Mixed Function Oxygenases
  • Cytochrome P-450 CYP4A

Associated data

  • GENBANK/AJ233397
  • GENBANK/AJ245436
  • GENBANK/AJ249793
  • GENBANK/AJ249825
  • GENBANK/AJ271219