Structural insights into the assembly and energy transfer of haptophyte photosystem I-light-harvesting supercomplex.

ABSTRACT: Haptophyta represents a major taxonomic group, with plastids derived from the primary plastids of red algae. Here, we elucidated the cryoelectron microscopy structure of the photosystem I-light-harvesting complex I (PSI-LHCI) supercomplex from the haptophyte Isochrysis galbana. The PSI core comprises 12 subunits, which have evolved differently from red algae and cryptophytes by losing the PsaO subunit while incorporating the PsaK subunit, which is absent in diatoms and dinoflagellates. The PSI core is encircled by 22 fucoxanthin-chlorophyll a/c-binding light-harvesting antenna proteins (iFCPIs) that form a trilayered antenna arrangement. Moreover, a pigment-binding subunit, L_iFP, which has not been identified in any other previously characterized PSI-LHCI su

SUBMITTER: He FY 

PROVIDER: S-EPMC11648859 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature