Isolation and sequencing of a second Rhizobium tropici CFN299 genetic locus that contains genes homologous to amino acid sulphate activation genes.

TitleIsolation and sequencing of a second Rhizobium tropici CFN299 genetic locus that contains genes homologous to amino acid sulphate activation genes.
Publication TypeJournal Article
Year of Publication1998
AuthorsLaeremans, T., E. Martínez-Romero, and J. Vanderleyden
JournalDNA Seq
Volume9
Issue1
Pagination65-70
Date Published1998 Mar
ISSN1042-5179
KeywordsAmino Acids, Base Composition, Genes, Bacterial, Molecular Sequence Data, Open Reading Frames, Phylogeny, Physical Chromosome Mapping, Restriction Mapping, Rhizobium, Sulfates
Abstract

A Rhizobium tropici CFN299 DNA region, homologous to genes involved in Nod factor synthesis and amino acid sulphate activation, was isolated from a genome library. DNA sequence analysis revealed two open reading frames, orf1 and orf2. orf1 showed highest sequence similarity to the Escherichia coli cysD gene while orf2 is closely related to Rhizobium sp. N33 nodQ. However, the orf2 deduced peptide is 152 amino acids shorter than Rhizobium sp. N33 NodQ, and lacks the 3'-phosphoadenosine 5'-phosphosulphate-binding motif. A dendrogram based on the alignment of the deduced amino acid sequences of orf2/nodQ/cysN genes separated Escherichia coli cysN and orf2 from the nodQ cluster. Upstream of orf1, partial sequence analysis revealed the 3' part of an orf that is highly similar to E. coli cysH. The G + C content of orf1 and orf2 differs significantly from the G + C content of R. tropici symbiotic sulphate activation nodPQ genes. This data suggests that the isolated R. tropici CFN299 locus contains housekeeping genes for amino acid sulphate activation.

Alternate JournalDNA Seq.
PubMed ID9773278