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

AI Article Synopsis

  • Haptophyta is a taxonomic group with unique plastids derived from red algae; this study focuses on the structure of their photosystem I-light-harvesting complex I (PSI-LHCI) supercomplex using cryoelectron microscopy.
  • The PSI core is made up of 12 subunits that have adapted differently from those in red algae and cryptophytes, losing the PsaO subunit and gaining the PsaK subunit, along with 22 antenna proteins that arrange into a trilayered structure.
  • A previously unidentified pigment-binding subunit, L, was found in the PSI-iFCPI, which helps with energy transfer between the proteins, and computer simulations show that this complex efficiently transfers excitation

Article 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 . 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 /-binding light-harvesting antenna proteins (iFCPIs) that form a trilayered antenna arrangement. Moreover, a pigment-binding subunit, L, which has not been identified in any other previously characterized PSI-LHCI supercomplexes, was determined in PSI-iFCPI, presumably facilitating the interactions and energy transfer between peripheral iFCPIs and the PSI core. Calculation of excitation energy transfer rates by computational simulations revealed that the intricate pigment network formed within PSI-iFCPI ensures efficient transfer of excitation energy. Overall, our study provides a solid structural foundation for understanding the light-harvesting and energy transfer mechanisms in haptophyte PSI-iFCPI and provides insights into the evolution and structural variations of red-lineage PSI-LHCIs.

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Source
http://dx.doi.org/10.1073/pnas.2413678121DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11648859PMC

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