Mechanism of Nitrogen Fixation by Nitrogenase: The Next Stage
نویسندگان
چکیده
منابع مشابه
Non-symbiotic Nitrogen Fixation in the Rhizo- Spheres of Rice, Maize and Different Tropical Grasses
Nitrogenase activity estimated in the rhizospheres of rice, maize and different tropical grasses grown under controlled laboratory conditions was shown to depend upon plant species. High nitrogenase activity (2000-6000 nmoles CzH4 h-' g-' dry root) occurred in rice rhizosphere, this activity being only 10 times lower than that of symbi0ticsystems;inthe rhizosphere of many other grasses grown in...
متن کاملPhosphoribulokinase mediates nitrogenase-induced carbon dioxide fixation gene repression in Rhodobacter sphaeroides
In many organisms there is a balance between carbon and nitrogen metabolism. These observations extend to the nitrogen-fixing, nonsulfur purple bacteria, which have the classic family of P(II) regulators that coordinate signals of carbon and nitrogen status to regulate nitrogen metabolism. Curiously, these organisms also possess a reverse mechanism to regulate carbon metabolism based on cellula...
متن کاملModeling the dynamic regulation of nitrogen fixation in the cyanobacterium Trichodesmium sp.
A physiological, unbalanced model is presented that explicitly describes growth of the marine cyanobacterium Trichodesmium sp. at the expense of N(2) (diazotrophy). The model involves the dynamics of intracellular reserves of carbon and nitrogen and allows the uncoupling of the metabolism of these elements. The results show the transient dynamics of N(2) fixation when combined nitrogen (NO(3)(-...
متن کاملNitric oxide: a multifaceted regulator of the nitrogen-fixing symbiosis.
The specific interaction between legumes and Rhizobium-type bacteria leads to the establishment of a symbiotic relationship characterized by the formation of new differentiated organs named nodules, which provide a niche for bacterial nitrogen (N2) fixation. In the nodules, bacteria differentiate into bacteroids with the ability to fix atmospheric N2 via nitrogenase activity. As nitrogenase is ...
متن کاملRegulation of nitrogen fixation in Rhodospirillum rubrum grown under dark, fermentative conditions.
Rhodospirillum rubrum was shown to grow fermentatively on fructose with N2 as a nitrogen source. The nitrogenase activity of these cells was regulated by the NH4+ switch-off/switch-on mechanism in a manner identical to that for photosynthetically grown cells. In vitro, the inactive nitrogenase Fe protein from fermenting cells was reactivated by an endogenous membrane-bound, Mn2+-dependent activ...
متن کامل