NDLI: Modification of the Fe Protein of Nitrogenase in Natural Populations of Trichodesmium thiebautii

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Modification of the Fe Protein of Nitrogenase in Natural Populations of Trichodesmium thiebautii

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Modification of the Fe Protein of Nitrogenase in Natural Populations of Trichodesmium thiebautii

Content Provider	PubMed Central
Author	Zehr, Jonathan P. Wyman, Michael Miller, Veronica Duguay, Linda Capone, Douglas G.
Abstract	The Fe protein of nitrogenase in the marine nonheterocystous cyanobacterium Trichodesmium thiebautii is interconverted between two forms, which is reminiscent of the ADP-ribosylation described in the purple bacterium Rhodospirillum rubrum. In natural populations of T. thiebautii during the day, when nitrogenase activity (NA) is present and while photosynthetic rates are high, a low-molecular-mass form of the Fe protein is present. In the late afternoon, the low-molecular-mass form is partially converted to a higher-molecular-mass form (approximately equal distribution of high- and low-molecular-mass forms of the Fe protein subunits), concurrent with cessation of NA. Some of the higher-molecular-mass form persists through the night until the very early morning, when the lower-molecular-mass form appears. New synthesis of both the Fe and MoFe proteins of nitrogenase appears to occur at this time. The higher-molecular-mass form of the Fe protein is also produced rapidly in response to artificially elevated external O2 levels (40%) during the day. T. thiebautii is capable of recovery of NA in less than 1 h following exposure to 40% O2, which is correlated with the return of the Fe protein to the lower-molecular-mass form. Recovery from exposure to O2 is not dependent upon protein synthesis. The modification of the Fe protein is clearly involved in regulation of NA during the diel cycle of NA in T. thiebautii but may also be involved in protecting the Fe protein during transient O2 concentration increases.
Starting Page	669
File Format	PDF
ISSN	10985336
e-ISSN	10985336
Journal	Applied and Environmental Microbiology
Issue Number	3
Volume Number	59
Language	English
Publisher Date	1993-03-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ecology Food Science Applied Microbiology and Biotechnology Biotechnology

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