Abstract
The first low resolution solution structure of the soluble domain of subunit b (b 22–156) of the Escherichia coli F1FO ATPsynthase was determined from small-angle X-ray scattering data. The dimeric protein has a boomerang-like shape with a total length of 16.2±0.3 nm. Fluorescence correlation spectroscopy (FCS) shows that the protein binds effectively to the subunit δ, confirming their described neighborhood. Using the recombinant C-terminal domain (δ91–177) of subunit δ and the C-terminal peptides of subunit b, b 120–140 and b 140–156, FCS titration experiments were performed to assign the segments involved in δ−b assembly. These data identify the very C-terminal tail b 140–156 to interact with δ91–177. The novel 3D structure of this peptide has been determined by NMR spectroscopy. The molecule adopts a stable helix formation in solution with a flexible tail between amino acid 140 to 145.
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Priya, R., Tadwal, V.S., Roessle, M.W. et al. Low resolution structure of subunit b (b 22–156) of Escherichia coli F1FO ATP synthase in solution and the b−δ assembly. J Bioenerg Biomembr 40, 245–255 (2008). https://doi.org/10.1007/s10863-008-9154-x
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DOI: https://doi.org/10.1007/s10863-008-9154-x