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Figure 5.
Fig. 5. Water channels P1 and P2 observed in the dark RC
structure leading from the Q[B] pocket to the surface of the
protein on the^ cytoplasmic side of the RC. The coloring scheme
is: H subunit (green), L subunit (yellow), M subunit (blue),
water molecules (red), bacteriochlorophylls (green), and
bacteriopheophytin (purple). Q[A] and Q[B] are colored
orange-red, while the nonheme iron is rust-colored. The
positions of the quinone tails past carbon C16 are less well
defined because of poor electron density. The approximate
location of the membrane is indicated by the shaded region. The
details of the P1 and P2 pathways are shown in Fig. 6, A and B.
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