The nif genes are encoding enzymes involved in the fixation of atmospheric nitrogen into a form of nitrogen available to living organisms. The primary enzyme encoded by the nif genes is the nitrogenase complex which is in charge of converting atmospheric nitrogen (N2) to other nitrogen forms such as ammonia which the organism can use for various purposes. Besides the nitrogenase enzyme, the nif genes also encode a number of regulatory proteins involved in nitrogen fixation. The nif genes are found in both diazotrophs associated with various plants. The expression of the nif genes is induced as a response to low concentrations of fixed nitrogen and oxygen concentrations (the low oxygen concentrations are actively maintained in the root environment of host plants). The first Rhizobium genes for nitrogen fixation (nif) and for nodulation (nod) were cloned in the early 1980s by Gary Ruvkun and Sharon R. Long in Frederick M. Ausubel's laboratory.
Klebsiella pneumoniae—a free-living anaerobic nitrogen-fixing bacterium. It contains a total of 20 nif genes located on the chromosome in a 24-Kb region. nifH, nifD, and nifK encode the nitrogenase subunits, while nifE, nifN, nifU, nifS, nifV, nifW, nifX, nifB, and nifQ encode proteins involved the assembly and incorporation of iron and molybdenum atoms into the nitrogenase subunits. nifF and nifJ encode proteins related to electron transfer taking place in the reduction process and nifA and nifL are regulatory proteins in charge of regulating the expression of the other nif genes. Iwo Watanabe, "Biological Nitrogen Fixation and its Use in Agriculture (outline)"
Rhodospirillum rubrum—a free-living anaerobic photosynthetic bacterium which, in addition to the transcriptional controls described above, regulates expression of the nif genes also in a metabolic way through a reversible ADP-ribosylation of a specific arginine residue in the nitrogenase complex. The ribosylation takes place when reduced nitrogen is present and it causes a barrier in the electron transfer flow and thereby inactivates nitrogenase activity. The enzymes catalyzing the ribosylation are called DraG and DraT.Merrick MJ, Edwards RA (1995). Nitrogen control in bacteria. Microbiol Review 59(4):604-22
Rhodobacter—a free-living anaerobic phototroph containing a transcriptional nif gene regulatory system. R. capsulatus regulates nif gene expression through nifA in the same manner described before, but it uses a different nifA activator which initiates the NtrC. NtrC activates a different expression of nifA and the other nif genes.
Rhizobium spp.—Gram-negative, symbiotic nitrogen fixing bacteria that usually form a symbiotic relationship with legume species. In some rhizobia, the nif genes are located on plasmids called 'sym plasmids' (sym = symbiosis) which contain genes related to nitrogen fixation and metabolism, while the chromosomes contain most of the housekeeping genes of the bacteria. Regulation of the nif genes is at the transcriptional level and is dependent on colonization of the plant host.
|
|