Azotobacteraceae
Encyclopedia
The family Azotobacteraceae contains aerobic diazotrophs with two Genera, Azomonas
and Azotobacter
, distinguished by the ability to form cysts. The family is also characterized by variable cell shape, the classic shape being ovoid while many are pleomorphic. With an adequate supply of Mo the Azotobacteraceae are able to fix at least 10 mg of molecular nitrogen per gram of carbohydrate consumed under aerobic conditions. Like most Pseudomonadacea, the Azotobacteraceae are able to utilize a wide variety of carbon sources, including sucrose. Recent analysis of the unannotated genome of Azotobacter vinelandii has shown that this bacterium is most appropriately grouped in the family Pseudomonadaceae
. The original familial distinction was based on the ability to fix nitrogen, but a few Pseudomonadaceae have been found to fix nitrogen as well. The relation is not surprising given the ability of many Azotobacteraceae to fluoresce due to the production of Pyoverdine
, a nonribosomal
peptide siderophore
typical of many Pseudomonadaceae
Azomonas
Azomonas are typically motile, oval to spherical, and secrete large quantities of capsular slime. They are distinguished from Azotobacter by their inability to form cysts, but like Azotobacter they can biologically fix nitrogen under aerobic conditions .-Etymology:The name Azomonas derives...
and Azotobacter
Azotobacter
Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime. They are aerobic, free-living soil microbes which play an important role in the nitrogen cycle in nature, binding atmospheric nitrogen, which is...
, distinguished by the ability to form cysts. The family is also characterized by variable cell shape, the classic shape being ovoid while many are pleomorphic. With an adequate supply of Mo the Azotobacteraceae are able to fix at least 10 mg of molecular nitrogen per gram of carbohydrate consumed under aerobic conditions. Like most Pseudomonadacea, the Azotobacteraceae are able to utilize a wide variety of carbon sources, including sucrose. Recent analysis of the unannotated genome of Azotobacter vinelandii has shown that this bacterium is most appropriately grouped in the family Pseudomonadaceae
Pseudomonadaceae
The Pseudomonadaceae is a family of bacteria that includes the genera Azomonas, Azomonotrichon, Azorhizophilus, Azotobacter, Cellvibrio, Mesophilobacter, Pseudomonas , Rhizobacter, Rugamonas, and Serpens...
. The original familial distinction was based on the ability to fix nitrogen, but a few Pseudomonadaceae have been found to fix nitrogen as well. The relation is not surprising given the ability of many Azotobacteraceae to fluoresce due to the production of Pyoverdine
Pyoverdine
Pyoverdine is a fluorescent siderophore produced by the Gram negative bacterium Pseudomonas aeruginosa.In Pseudomonas aeruginosa PAO1 there are 14 pvd genes involed in the synthesis of the pyoveridine....
, a nonribosomal
Nonribosomal peptide
Nonribosomal peptides are a class of peptide secondary metabolites, usually produced by microorganisms like bacteria and fungi. Nonribosomal peptides are also found in higher organisms, such as nudibranchs, but are thought to be made by bacteria inside these organisms...
peptide siderophore
Siderophore
Siderophores are small, high-affinity iron chelating compounds secreted by grasses and microorganisms such as bacteria and fungi...
typical of many Pseudomonadaceae