Unraveling the evolutionary trajectory of LHCI in red-lineage algae: Conservation, diversification, and neolocalization.

ABSTRACT: Red algae and the secondary symbiotic algae that engulfed a red alga as an endosymbiont are called red-lineage algae. Several photosystem (PS) I-light-harvesting complex I (LHCI) structures have been reported from red-lineage algae-two red algae Cyanidioschyzon merolae (Cyanidiophyceae) and Porphyridium purpureum (Rhodophytina), a diatom, and a Cryptophyte. Here, we clarified the orthologous relation of LHCIs by combining a detailed phylogenetic analysis and the structural information of PSI-LHCI. We found that the seven Lhcr groups in LHCI are conserved in Rhodophytina; furthermore, during both genome reduction in Cyanidioschyzonales and endosymbiosis leading to Cryptophyta, some LHCIs were lost and replaced by existing or differentiated LHCIs. We denominate "neolocalization

SUBMITTER: Kumazawa M 

PROVIDER: S-EPMC11462038 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature