Fig. 4: PsaQ structure and the interactions with PSI-CAC.
From: Growth phase-dependent reorganization of cryptophyte photosystem I antennae
a Overall structure of PsaQ. Four helices are labeled in numbers. The N- and C-terminus (N-ter and C-ter), the loop between helix 2 and 3 (2/3 loop), and two chlorophylls are indicated. b, c PsaQ and its chlorophyll molecules insert into the membrane plane between PsaB and CAC-i (b) and between CAC-i and CAC-h (c). The 2/3 loop and N-terminal fragment of PsaQ are highlighted in black. d, e Hydrogen-bond interactions between PsaQ and PsaB (d) and between PsaQ and CAC-i (e). f Closely associated chlorophylls in PsaQ, PsaB and CAC-i. The protein skeleton of CAC-i is omitted for clarity.
