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. 2014 Sep 27;70(Pt 10):2692–2701. doi: 10.1107/S1399004714017313

Figure 1.

Figure 1

(a) The structure of the proton-release channel observed for the neutral purple form of bR in the P622 crystal (purple; PDB entry 1iw6; Matsui et al., 2002 ▶) is compared with those observed for aR2 in the P321 crystal (green; PDB entry 2ei4; Yoshimura & Kouyama, 2008 ▶), cR3 in the P321 crystal (orange; PDB entry 4jr8; Chan et al., 2014 ▶) and dR3 in the R32 crystal (blue; PDB entry 4fbz; Zhang et al., 2013 ▶). (b) The structure of the proton-release channel observed for the neutral purple form of bR in the P622 crystal (purple) is compared with those observed for the alkaline pink form of bR in the P622 crystal (yellow; PDB entry 1xok; Okumura et al., 2005 ▶), bR in the C2 crystal (PDB entry 1brr; Essen et al., 1998 ▶) and bR in the P63 crystal (PDB entry 1qhj; Belrhali et al., 1999 ▶).