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- W2016294149 abstract "The nitrogenase MoFe protein is a heterotetramer containing two unique high-nuclearity metalloclusters, FeMoco and the P-cluster. FeMoco is assembled outside the MoFe protein, whereas the P-cluster is assembled directly on the MoFe protein polypeptides. MoFe proteins isolated from different genetic backgrounds have been analyzed using biochemical and spectroscopic techniques in attempting to elucidate the pathway of P-cluster biosynthesis. The ΔnifH MoFe protein is less stable than other MoFe proteins and has been shown by extended X-ray absorption fine structure studies to contain a variant P-cluster that most likely exists as two separate [Fe4S4]-like clusters instead of the subunit-bridging [Fe8S7] cluster found in the wild-type and ΔnifB forms of the MoFe protein [Corbett, M. C., et al. (2004) J. Biol. Chem. 279, 28276−28282]. Here, a combination of small-angle X-ray scattering and Fe chelation studies is used to show that there is a correlation between the state of the P-cluster and the conformation of the MoFe protein. The ΔnifH MoFe protein is found to be larger than the wild-type or ΔnifB MoFe proteins, an increase in size that can be modeled well by an opening of the subunit interface consistent with P-cluster fragmentation and solvent exposure. Importantly, this opening would allow for the insertion of P-cluster precursors into a region of the MoFe protein that is buried in the wild-type conformation. Thus, ΔnifH MoFe protein could represent an early intermediate in MoFe protein biosynthesis where the P-cluster precursors have been inserted, but P-cluster condensation and tetramer stabilization have yet to occur." @default.
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- W2016294149 date "2007-06-14" @default.
- W2016294149 modified "2023-09-24" @default.
- W2016294149 title "Conformational Differences between <i>Azotobacter vinelandii</i> Nitrogenase MoFe Proteins As Studied by Small-Angle X-ray Scattering" @default.
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- W2016294149 doi "https://doi.org/10.1021/bi7005064" @default.
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