Structure of the LH-I–RC complex.
(a) Side view of the LH-I–RC complex with three LH-I
αβ-heterodimers on the front side removed to expose the RC in the
interior. The α-helices are represented as cylinders with the L, M,
and H subunits of the RC in yellow, red, and gray, and the
α-apoprotein and the β-apoprotein of the LH-I in blue and magenta.
BChls and bacteriopheophytins are represented as green and yellow
squares, respectively. Carotenoids (spheroidenes) are in a yellow
licorice representation, and quinone QB is rendered by gray van
der Waals spheres. QB shuttles in and out (as
QBH2) of the LH-I–RC complex as indicated in Fig.
1. (b) Arrangement of BChls in the LH-I–RC complex. The
BChls are represented as squares with B875 BChls of LH-I in green, and
the special pair (PA and PB) and the accessory BChls
(BA and BB) of the RC in red and blue, respectively;
cyan bars represent Qy transition moments of BChls. [Produced
with the program vmd (25)].