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. 1985 Nov;4(11):2751–2756. doi: 10.1002/j.1460-2075.1985.tb03999.x

Mapping and expression of a regulatory nitrogen fixation gene (fixD) of Rhizobium meliloti

Gerhard Weber 1,1, Helmut Reiländer 1, Alfred Pühler 1
PMCID: PMC554574  PMID: 16453640

Abstract

A 3.5-kb HindIII fragment from the main nif/fix (nitrogen fixation) gene cluster of Rhizobium meliloti was characterized by studying its expression in Escherichia coli minicells. A coding region for two polypeptides of 68 K and 66 K was mapped using Tn5 insertions and hybrid fusion polypeptides. DNA sequence analysis of this region revealed the presence of an open reading frame capable of coding for a polypeptide of 59.9 K mol. wt. This coding region was designated fixD. Plasmids, constitutively expressing this fixD gene from vector promoters, activated a nifHD-lacZ fusion in E. coli at a low level. Higher levels of activation were obtained following an enhanced expression of the fixD gene in plasmid pRmW541 which was achieved by inducing deletions between the vector promoter and the fixD gene. Sequencing of these deletion mutants showed that, in most cases, fusion polypeptides of the fixD gene product and the aphI (aminoglycoside-3'-phosphotransferase) gene product were sufficient for activation. In E. coli the activation is strictly dependent upon a functional glnF (ntrA) gene.

Keywords: fix genes, gene expression, minicells, nif gene regulation, Rhizobium meliloti

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Backman K., Boyer H. W. Tetracycline resistance determined by pBR322 is mediated by one polypeptide. Gene. 1983 Dec;26(2-3):197–203. doi: 10.1016/0378-1119(83)90190-7. [DOI] [PubMed] [Google Scholar]
  2. Birnboim H. C., Doly J. A rapid alkaline extraction procedure for screening recombinant plasmid DNA. Nucleic Acids Res. 1979 Nov 24;7(6):1513–1523. doi: 10.1093/nar/7.6.1513. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Burton Z., Burgess R. R., Lin J., Moore D., Holder S., Gross C. A. The nucleotide sequence of the cloned rpoD gene for the RNA polymerase sigma subunit from E coli K12. Nucleic Acids Res. 1981 Jun 25;9(12):2889–2903. doi: 10.1093/nar/9.12.2889. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Casadaban M. J., Chou J., Cohen S. N. In vitro gene fusions that join an enzymatically active beta-galactosidase segment to amino-terminal fragments of exogenous proteins: Escherichia coli plasmid vectors for the detection and cloning of translational initiation signals. J Bacteriol. 1980 Aug;143(2):971–980. doi: 10.1128/jb.143.2.971-980.1980. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Chang A. C., Cohen S. N. Construction and characterization of amplifiable multicopy DNA cloning vehicles derived from the P15A cryptic miniplasmid. J Bacteriol. 1978 Jun;134(3):1141–1156. doi: 10.1128/jb.134.3.1141-1156.1978. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Cohen S. N., Chang A. C., Hsu L. Nonchromosomal antibiotic resistance in bacteria: genetic transformation of Escherichia coli by R-factor DNA. Proc Natl Acad Sci U S A. 1972 Aug;69(8):2110–2114. doi: 10.1073/pnas.69.8.2110. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Corbin D., Barran L., Ditta G. Organization and expression of Rhizobium meliloti nitrogen fixation genes. Proc Natl Acad Sci U S A. 1983 May;80(10):3005–3009. doi: 10.1073/pnas.80.10.3005. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Dougan G., Sherratt D. The transposon Tn1 as a probe for studying ColE1 structure and function. Mol Gen Genet. 1977 Mar 7;151(2):151–160. doi: 10.1007/BF00338689. [DOI] [PubMed] [Google Scholar]
  9. Holmes W. M., Platt T., Rosenberg M. Termination of transcription in E. coli. Cell. 1983 Apr;32(4):1029–1032. doi: 10.1016/0092-8674(83)90287-8. [DOI] [PubMed] [Google Scholar]
  10. Ish-Horowicz D., Burke J. F. Rapid and efficient cosmid cloning. Nucleic Acids Res. 1981 Jul 10;9(13):2989–2998. doi: 10.1093/nar/9.13.2989. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Laemmli U. K. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature. 1970 Aug 15;227(5259):680–685. doi: 10.1038/227680a0. [DOI] [PubMed] [Google Scholar]
  12. MacNeil D. General method, using Mu-Mud1 dilysogens, to determine the direction of transcription of and generate deletions in the glnA region of Escherichia coli. J Bacteriol. 1981 Apr;146(1):260–268. doi: 10.1128/jb.146.1.260-268.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Maxam A. M., Gilbert W. A new method for sequencing DNA. Proc Natl Acad Sci U S A. 1977 Feb;74(2):560–564. doi: 10.1073/pnas.74.2.560. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Merrick M. J. Nitrogen control of the nif regulon in Klebsiella pneumoniae: involvement of the ntrA gene and analogies between ntrC and nifA. EMBO J. 1983;2(1):39–44. doi: 10.1002/j.1460-2075.1983.tb01377.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Messing J., Vieira J. A new pair of M13 vectors for selecting either DNA strand of double-digest restriction fragments. Gene. 1982 Oct;19(3):269–276. doi: 10.1016/0378-1119(82)90016-6. [DOI] [PubMed] [Google Scholar]
  16. Norrander J., Kempe T., Messing J. Construction of improved M13 vectors using oligodeoxynucleotide-directed mutagenesis. Gene. 1983 Dec;26(1):101–106. doi: 10.1016/0378-1119(83)90040-9. [DOI] [PubMed] [Google Scholar]
  17. Oka A., Sugisaki H., Takanami M. Nucleotide sequence of the kanamycin resistance transposon Tn903. J Mol Biol. 1981 Apr 5;147(2):217–226. doi: 10.1016/0022-2836(81)90438-1. [DOI] [PubMed] [Google Scholar]
  18. Ow D. W., Sundaresan V., Rothstein D. M., Brown S. E., Ausubel F. M. Promoters regulated by the glnG (ntrC) and nifA gene products share a heptameric consensus sequence in the -15 region. Proc Natl Acad Sci U S A. 1983 May;80(9):2524–2528. doi: 10.1073/pnas.80.9.2524. [DOI] [PMC free article] [PubMed] [Google Scholar]
  19. Rothstein S. J., Jorgensen R. A., Postle K., Reznikoff W. S. The inverted repeats of Tn5 are functionally different. Cell. 1980 Mar;19(3):795–805. doi: 10.1016/s0092-8674(80)80055-9. [DOI] [PubMed] [Google Scholar]
  20. Ruvkun G. B., Ausubel F. M. Interspecies homology of nitrogenase genes. Proc Natl Acad Sci U S A. 1980 Jan;77(1):191–195. doi: 10.1073/pnas.77.1.191. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Ruvkun G. B., Sundaresan V., Ausubel F. M. Directed transposon Tn5 mutagenesis and complementation analysis of Rhizobium meliloti symbiotic nitrogen fixation genes. Cell. 1982 Jun;29(2):551–559. doi: 10.1016/0092-8674(82)90171-4. [DOI] [PubMed] [Google Scholar]
  22. Sanger F., Nicklen S., Coulson A. R. DNA sequencing with chain-terminating inhibitors. Proc Natl Acad Sci U S A. 1977 Dec;74(12):5463–5467. doi: 10.1073/pnas.74.12.5463. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Stormo G. D., Schneider T. D., Gold L. M. Characterization of translational initiation sites in E. coli. Nucleic Acids Res. 1982 May 11;10(9):2971–2996. doi: 10.1093/nar/10.9.2971. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Sundaresan V., Jones J. D., Ow D. W., Ausubel F. M. Klebsiella pneumoniae nifA product activates the Rhizobium meliloti nitrogenase promoter. Nature. 1983 Feb 24;301(5902):728–732. doi: 10.1038/301728a0. [DOI] [PubMed] [Google Scholar]
  25. Szeto W. W., Zimmerman J. L., Sundaresan V., Ausubel F. M. A Rhizobium meliloti symbiotic regulatory gene. Cell. 1984 Apr;36(4):1035–1043. doi: 10.1016/0092-8674(84)90053-9. [DOI] [PubMed] [Google Scholar]
  26. Török I., Kondorosi A. Nucleotide sequence of the R.meliloti nitrogenase reductase (nifH) gene. Nucleic Acids Res. 1981 Nov 11;9(21):5711–5723. doi: 10.1093/nar/9.21.5711. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. Török I., Kondorosi E., Stepkowski T., Pósfai J., Kondorosi A. Nucleotide sequence of Rhizobium meliloti nodulation genes. Nucleic Acids Res. 1984 Dec 21;12(24):9509–9524. doi: 10.1093/nar/12.24.9509. [DOI] [PMC free article] [PubMed] [Google Scholar]
  28. Zimmerman J. L., Szeto W. W., Ausubel F. M. Molecular characterization of Tn5-induced symbiotic (Fix-) mutants of Rhizobium meliloti. J Bacteriol. 1983 Dec;156(3):1025–1034. doi: 10.1128/jb.156.3.1025-1034.1983. [DOI] [PMC free article] [PubMed] [Google Scholar]

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