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. 2021 Nov 2;12:6300. doi: 10.1038/s41467-021-26561-9

Fig. 2. Structure and property of Rba. sphaeroides protein-U.

Fig. 2

a Relative position of protein-U (magenta ribbon) in the LH1-RC. PufX is shown by the orange ribbon and the UQ-10 at QA and QB sites are shown by blue spheres. All other proteins are shown by cylinders with the same color scheme as in Fig. 1(a). b Structure of protein-U and its density map at a contour level of 3.0σ. c Close contacts (<3.5 Å, dashed lines) between the protein-U terminal regions (magenta) and LH1 α-polypeptides (green). d Amino acid sequence of protein-U and its two consecutive transmembrane regions predicted by the membrane protein topology program TMHMM. e Sucrose density gradient (10–40% w/v) centrifugations of the solubilized pigment-protein complexes from wild-type (WT) and protein-U-deleted (ΔU) Rba. sphaeroides IL106 membranes.