Promoters in the nodulation region of the Rhizobium leguminosarum Sym plasmid pRL1JI

• Published in: Plant molecular biology 1987, Vol.9 (1), p.27-39
• Main Authors: Spaink, H.P, Okker, R.J.H, Wijffelman, C.A, Pees, E, Lugtenberg, B.J.J
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Bacteriology; Biological and medical sciences; Biology of microorganisms of confirmed or potential industrial interest; Biotechnology; chromosome mapping; cloning; deletions; Economic plant physiology; flavonoids; Fundamental and applied biological sciences. Psychology; gene expression; genes; genetic regulation; Genetics; Microbiology; Mission oriented research; molecular sequence data; naringenin; nodulation; nucleotide sequences; operon; plasmids; promoter regions; restriction mapping; Rhizobium leguminosarum; root exudates; Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...); transcription (genetics); Trifolium subterraneum; vectors; Vicia hirsuta; Vicia sativa
• ISSN: 0167-4412; 1573-5028
• DOI: 10.1007/bf00017984

A region of 16.8 kb of the Sym(biosis) plasmid pRL1JI of Rhizobium leguminosarum, consisting of the established 9.7 kb nodulation region which confers nodulation ability on Vicia hirsuta and a region of 7.1 kb which appeared to be necessary for nodulation on V. sativa and Trifolium subterraneum, was subcloned as fragments of maximally 2.5 kb in a newly developed IncQ transcriptional fusion vector. The expression of these fragments was studied in Rhizobium. One constitutive promoter, pr.nodD, and three plant-exudate inducible promoters were found, namely the known pr.nodA and pr.nodF as well as a new promoter designated pr.nodM. The latter promoters were localized within 114 bp, 330 bp 630 bp respectively and they regulate the transcription of the operons nodA, B, C, I, J, nodF, E and of an operon of at least 2.5 kb located in the 7.1 kb region. Induction of the three inducible required plant exudate and a functional nodD product. The flavanone naringenin could replace plant exudate. Each of the three inducible promoters contained a nod-box. A consensus for the nod-box sequence, based on known sequences, is proposed. The 114 bp fragment which contain pr.nodA was used to localize pr.nodA by means of deletion mapping. The fragment which appeared necessary for complete pr.nodA activity is 72 bp in size, contains the complete nod-box and in addition a region of 21 bp downstream of the nod-box, in which the loosely conserved sequence AT(T)AG appears to be important for promoter activity.