Characterization of Genes Identified in the 120-MDa Plasmid of an Azospirillum brasilense Sp245 Mutant Defective in Polar Flagellation and Swarming

Characterization of Genes Identified in the 120-MDa Plasmid of an Azospirillum brasilense Sp245... The sequencing data were analyzed for two regions of the 120-MDa plasmid (p120) ofAzospirillum brasilense Sp245. The 2420-bp region I, which flanks the omegon insertion in the SK048 mutant defective in production of the polar flagellum (Fla–) and swarming (Swa–), was shown to contain a cluster of two open reading frames (orf) that possess properties of coding sequences (CDSs). The NtrA (σ54) boxes were found in their upstream regions. The products of orf1 and orf2 are 16.5 and 15.5 kDa in molecular weight and consist of 151 and 152 amino-acid residues, respectively. The ORF1 polypeptide was found to contain a region homologous to the cysteine- and glycine-rich zinc-binding domain of the DnaJ heat-shock protein. ORF2 showed a homology to Haemophilus ducreyi pilin, fragments of Streptomycesand Mycobacterium integral membrane proteins, and eukaryotic transcriptional regulators. The omegon proved to be inserted into orfX1/X2 which possibly has a deletion and shows a GC content untypical forA. brasilense genes. The deduced ORFX2 polypeptide is homologous to fragments of arsenite-translocating ATPase and signal-transducing histidine kinase of archaebacteria. Possible causes of the Fla– Swa–phenotype of the A. brasilense SK048 mutant are considered. One coding orf was identified in the 1194-bp region II located approximately 4 kb away from the omegon insertion. The N-terminal region of the deduced product of this partly sequenced orf was shown to contain a signal sequence typical for secreted proteins. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Characterization of Genes Identified in the 120-MDa Plasmid of an Azospirillum brasilense Sp245 Mutant Defective in Polar Flagellation and Swarming

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Biomedicine; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1023/A:1013703509110
Publisher site
See Article on Publisher Site

Abstract

The sequencing data were analyzed for two regions of the 120-MDa plasmid (p120) ofAzospirillum brasilense Sp245. The 2420-bp region I, which flanks the omegon insertion in the SK048 mutant defective in production of the polar flagellum (Fla–) and swarming (Swa–), was shown to contain a cluster of two open reading frames (orf) that possess properties of coding sequences (CDSs). The NtrA (σ54) boxes were found in their upstream regions. The products of orf1 and orf2 are 16.5 and 15.5 kDa in molecular weight and consist of 151 and 152 amino-acid residues, respectively. The ORF1 polypeptide was found to contain a region homologous to the cysteine- and glycine-rich zinc-binding domain of the DnaJ heat-shock protein. ORF2 showed a homology to Haemophilus ducreyi pilin, fragments of Streptomycesand Mycobacterium integral membrane proteins, and eukaryotic transcriptional regulators. The omegon proved to be inserted into orfX1/X2 which possibly has a deletion and shows a GC content untypical forA. brasilense genes. The deduced ORFX2 polypeptide is homologous to fragments of arsenite-translocating ATPase and signal-transducing histidine kinase of archaebacteria. Possible causes of the Fla– Swa–phenotype of the A. brasilense SK048 mutant are considered. One coding orf was identified in the 1194-bp region II located approximately 4 kb away from the omegon insertion. The N-terminal region of the deduced product of this partly sequenced orf was shown to contain a signal sequence typical for secreted proteins.

Journal

Russian Journal of GeneticsSpringer Journals

Published: Oct 13, 2004

References

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