English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Transcriptional regulation of the delta-aminolevulinic acid synthetase gene of Rhizobium meliloti was investigated under conditions of normal vegetative growth and during symbiosis with the legume host alfalfa. S1 nuclease mapping and DNA sequence analysis indicated that transcription originates from two sites separated by 238 base pairs. A deletion analysis of the putative promoter regions P1 and P2, corresponding to the proximal and distal RNA start sites, was carried out with Bal-31 nuclease. Promoter function was monitored as beta-galactosidase activity after fusing the deletions to lac Z and introducing them into Rhizobium on a broad host range plasmid. The data obtained suggest that both regions function equivalently as promoters. The DNA sequences of P1 and P2 show considerable homology in the region between -35 and the start of transcription. Both contain a -35 region that is analogous to the consensus E. coli promoter sequence, while the -10 region is dissimilar. No resemblance was found between either P1 or P2 and the promoter regions of genes under general nitrogen control.

Analysis of the 5′ regulatory region of the gene for δ-aminolevulinic acid synthetase ofRhizobium meliloti