Identification and design principles of far-red-absorbing chlorophyll in the light-harvesting complex.

ABSTRACT: Photosystem II from Prasiola crispa employs a unique ring-shaped undecameric light-harvesting complex (Pc-frLHC) in addition to the commonly observed minor monomeric and major trimeric LHCIIs. Each monomer of Pc-frLHC contains four transmembrane helices. In contrast to the typical three-helix LHCIIs that constitute for the peripheral light-harvesting antennas for photosystem II, Pc-frLHC carries chlorophylls capable of far-red absorption. Combining spectroscopic analyses with a quantum mechanical/molecular mechanical approach, we identified the far-red-absorbing chlorophyll(s) in Pc-frLHC, as well as its counterpart in another Trebouxiophyceae alga Coccomyxa sp. Obi (Co-frLHC). Spectroscopic analysis reveals that both complexes exhibit far-red-shifted absorption of chlorophylls at ∼710 nm.

SUBMITTER: Saito K 

PROVIDER: S-EPMC12148475 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature