User:Reidbrown0605/Nitrogen fixation

Article Draft
I couldn't figure out how to post in the section of the article I plan on editing. In short, I plan on adding a section to the Nitrogen Fixation article. Specifically, I want to add a section discussing the evolutionary history of how nitrogenase evolved. I think the best place for that would be in the Biological section, under the microorganisms subsection. I will add a new subsection called "Evolution of Nitrogenase". Below is my drafted text.

Evolution of Nitrogenase
The origin of nitrogenase has been of interest to paleobiologists and is a current area of active research. Nitrogenase is thought to have evolved sometime between 1.5-2.2 billion years ago (Ga) although some isotopic support showing nitrogenase evolution as early as around 3.2 Ga. Nitrogenase appears to have evolved maturase-like proteins, although the function of the preceding protein is currently unknown.

Nitrogenase has three different forms (Nif, Anf, and Vnf) that correspond with the metal found in the active site of the protein (Molybdenum, Iron, and Vanadium respectively). Marine metal abundances over Earth’s geologic timeline are thought to have driven the relative abundance of which form of nitrogenase was most common. Currently, there is no conclusive agreement on which form of nitrogenase arose first.