Extended Data Fig. 6: The IsiA structure and the IsiA-IsiA’ interaction.
From: Structural basis for energy and electron transfer of the photosystem I–IsiA–flavodoxin supercomplex
(a) Cartoon representation of IsiA. Helix I-VI and loops C and E are labeled. The chlorophylls a, carotenoids and the lipid molecule (sulfoquinovosyldiacyl glycerol, SQDG) are shown as sticks and colored green, orange and blue, respectively. The unique pigments bound with IsiA compared with PSII CP43 (a516, a517, a518, a519, BCR521) are shown in red color. (b) Structural superposition of IsiA from Synechococcus 7942 (warm pink) with IsiA from Synechocystis 6803 (white). (c) Structural superposition of IsiA (warm pink) with PSII CP43 (white, PDB code 3WU2). (d, e) The interactions between two adjacent IsiA proteins (warm pink, IsiA; light blue, IsiA’) from two different views. The pigments at the IsiA-IsiA’ interface are shown in sticks and labeled. The phytol chains of chlorophylls are omitted. The potential EET pathways are indicated by black dashes.
