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- 2D crystals of Light Harversting Complex, LH2, from Rba. sphaeroides
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Fig. 2
Panel A : Bacterial photosynthetic apparatus. Panel B : (1) 3D reconstruction by cryo-electron microscopy of the core complex from Rb. veldkampii that contains a PufX subunit unable to form dimers. (2) Projection map of the dimeric core complex of Rb. sphaeroides with a proposed sub-units organization that includes a pair of Pufx holding the rest of the dimer. Panel C : (1, 2) Tubular membranes of Rb. sphaeroides containing dimeric core complexes. (3) Model of a dimer of PufX hold by the GXXXG motif present in Rb. sphaeroides and absent in PufX of Rb. veldkampii. (5) The angle between the two PufX leads to the formation of a convex dimeric core complex that curves the membrane in enriched areas. Panel D : Proposed mechanism of subunits assembly during the biosynthesis of the cores complexes. In Rb. sphaeroides, after dimerization of PufX (pink ellipse), α (blue circles) and β (green circles) subunits are assembled in pairs leading to antenna with opposite curvature that could not be enclosed due to steric hindrance. The opening in the antenna might be a preferred passage for the quinones to the cyt. bc1. In Rb. velkampii, Pufx is unable to dimerize and the a and b subunits are assembled in pairs up to the enclosure.