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- W1991877306 abstract "Two-dimensional crystals of dimeric photosynthetic reaction centre–LH1–PufX complexes have been analysed by cryoelectron microscopy . The 8.5 Å resolution projection map extends previous analyses of complexes within native membranes to reveal the α-helical structure of two reaction centres and 28 LH1 αβ subunits within the dimer. For the first time, we have achieved sufficient resolution to suggest a possible location for the PufX transmembrane helix, the orientation of the RC and the arrangement of helices within the surrounding LH1 complex. Whereas low-resolution projections have shown an apparent break in the LH1, our current map reveals a diffuse density within this region, possibly reflecting high mobility. Within this region the separation between β14 of one monomer and β2 of the other monomer is ∼6 Å larger than the average β–β spacing within LH1; we propose that this is sufficient for exchange of quinol at the RC Q B site. We have determined the position and orientation of the RC within the dimer, which places its Q B site adjacent to the putative PufX, with access to the point in LH1 that appears most easily breached. PufX appears to occupy a strategic position between the mobile αβ14 subunit and the Q B site, suggesting how the structure, possibly coupled with a flexible ring, plays a role in optimizing quinone exchange during photosynthesis ." @default.
- W1991877306 created "2016-06-24" @default.
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- W1991877306 date "2005-06-01" @default.
- W1991877306 modified "2023-10-01" @default.
- W1991877306 title "The 8.5Å Projection Structure of the Core RC–LH1–PufX Dimer of Rhodobacter sphaeroides" @default.
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- W1991877306 doi "https://doi.org/10.1016/j.jmb.2005.04.032" @default.
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