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Fixation by Free-Living Micro-Organisms: Enzymology

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The Chemistry and Biochemistry of Nitrogen Fixation
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Abstract

N2 fixation is accomplished by the combined action of two proteins, and this complicates the problem of nomenclature. The problem is particularly acute because it is not clear whether the proteins act independently or as a complex, nor is it clear what specific action each protein effects. Nitrogenase or the N2-fixing complex refers to the two proteins acting together. The individual proteins of nitrogenase will be termed the Mo-Fe protein and the Fe protein; some workers refer to these as ‘protein 1’ or ‘fraction 1’ and ‘protein 2’ or ‘fraction 2’ respectively. Although these designations are not completely definitive, because other Fe proteins do exist in the N2-fixing cells, they seem preferable currently to azoferredoxin and molybdoferredoxin. Mortenson, Morris and Jeng (1967) introduced the term azoferredoxin to designate the N2-binding protein of the nitrogenase complex, but later work (Bui and Mortenson, 1968) suggested that it is the Mo-Fe protein which binds N2. When the chemical nature of the Mo-Fe and Fe proteins and their functions are better established a more rational nomenclature can be assigned.

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© 1971 Plenum Publishing Company Ltd.

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Burris, R.H. (1971). Fixation by Free-Living Micro-Organisms: Enzymology. In: Postgate, J.R. (eds) The Chemistry and Biochemistry of Nitrogen Fixation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1818-7_4

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  • DOI: https://doi.org/10.1007/978-1-4684-1818-7_4

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4684-1820-0

  • Online ISBN: 978-1-4684-1818-7

  • eBook Packages: Springer Book Archive

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