Structure and function of the Pseudomonas putida integration host factor
| Autor: | Simi Koby, Amos B. Oppenheim, R Calb, A Davidovitch, Hilla Giladi, J M Sanchez-Romero, K N Timmis, A Holtel, Hanah Margalit, David M. Goldenberg, V de Lorenzo |
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| Předmět: |
DNA
Bacterial Integration Host Factors Sequence analysis Operon Mutant Molecular Sequence Data Biology medicine.disease_cause Microbiology chemistry.chemical_compound Bacterial Proteins medicine Escherichia coli Amino Acid Sequence Cloning Molecular Molecular Biology Gene Peptide sequence Genetics Base Sequence Molecular Structure Sequence Homology Amino Acid Pseudomonas putida Sequence Analysis DNA biology.organism_classification biological factors DNA-Binding Proteins chemistry bacteria DNA Research Article |
| Zdroj: | Scopus-Elsevier |
| Popis: | Integration host factor (IHF) is a DNA-binding and -bending protein that has been found in a number of gram-negative bacteria. Here we describe the cloning, sequencing, and functional analysis of the genes coding for the two subunits of IHF from Pseudomonas putida. Both the ihfA and ihfB genes of P. putida code for 100-amino-acid-residue polypeptides that are 1 and 6 residues longer than the Escherichia coli IHF subunits, respectively. The P. putida ihfA and ihfB genes can effectively complement E. coli ihf mutants, suggesting that the P. putida IHF subunits can form functional heterodimers with the IHF subunits of E. coli. Analysis of the amino acid differences between the E. coli and P. putida protein sequences suggests that in the evolution of IHF, amino acid changes were mainly restricted to the N-terminal domains and to the extreme C termini. These changes do not interfere with dimer formation or with DNA recognition. We constructed a P. putida mutant strain carrying an ihfA gene knockout and demonstrated that IHF is essential for the expression of the P(U) promoter of the xyl operon of the upper pathway of toluene degradation. It was further shown that the ihfA P. putida mutant strain carrying the TOL plasmid was defective in the degradation of the aromatic model compound benzyl alcohol, proving the unique role of IHF in xyl operon promoter regulation. |
| Databáze: | OpenAIRE |
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