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Gene Review:

nifU - nitrogen fixation protein

Nostoc sp. PCC 7120

Hill, D.R. et al., Beesley, C.E. et al., Henriksson, L.E. et al., Defrancesco, N. et al., Mulligan, M.E. et al., et al.

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Disease relevance of nifU

The nifU-nifH intergenic region of Nostoc sp. strain MUN 8820 was sequenced (1,229 bp) and was approximately 95% identical to the equivalent region in N. commune UTEX 584 [1].
Cloning of nifHD from Nostoc commune UTEX 584 and of a flanking region homologous to part of the Azotobacter vinelandii nifU gene [2].

High impact information on nifU

It is located just upstream of the nifHDK operon and consists of four genes in the order nifB, fdxN, nifS, and nifU [3].
The nucleotide sequence of the 3' end of the nifU coding sequence, the complete coding sequence of nifH and a substantial part of the 5' end of nifD coding sequence from Nostoc 6720 is presented [4].
Nitrogen-fixation by two species of Nostoc, one of them a lichen phycobiont, was generally stimulated by low concentrations of arsenic, cadmium, nickel, lead, palladium, and zinc [5].

Biological context of nifU

A 3.5-kb segment of DNA containing nifU glbN nifH nifD was cloned from a gene library of Nostoc 584 and sequenced [6].

Other interactions of nifU

Each strand of the DNA from the nifU-nifH intergenic regions of both strains has the potential to fold into secondary structures in which more than 50% of the bases are internally paired [1].

References

GlbN (cyanoglobin) is a peripheral membrane protein that is restricted to certain Nostoc spp. Hill, D.R., Belbin, T.J., Thorsteinsson, M.V., Bassam, D., Brass, S., Ernst, A., Böger, P., Paerl, H., Mulligan, M.E., Potts, M. J. Bacteriol. (1996) [Pubmed]
Cloning of nifHD from Nostoc commune UTEX 584 and of a flanking region homologous to part of the Azotobacter vinelandii nifU gene. Defrancesco, N., Potts, M. J. Bacteriol. (1988) [Pubmed]
Nitrogen fixation (nif) genes of the cyanobacterium Anabaena species strain PCC 7120. The nifB-fdxN-nifS-nifU operon. Mulligan, M.E., Haselkorn, R. J. Biol. Chem. (1989) [Pubmed]
Cloning and nucleotide sequence of the gene encoding dinitrogenase reductase (nifH) from the cyanobacterium Nostoc 6720. Beesley, C.E., Smith, R.J., Temple, S.J., Lea, P.J. Biochim. Biophys. Acta (1994) [Pubmed]
Effects of some inorganic elements on nitrogen-fixation in blue-green algae and some ecological aspects of pollution. Henriksson, L.E., DaSilva, E.J. Z. Allg. Mikrobiol. (1978) [Pubmed]
Analysis of the sequences within and flanking the cyanoglobin-encoding gene, glbN, of the cyanobacterium Nostoc commune UTEX 584. Angeloni, S.V., Potts, M. Gene (1994) [Pubmed]

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