Structural analysis of PSI-ACPI and PSII-ACPII supercomplexes from a cryptophyte alga <i>Rhodomonas</i> sp. NIES-2332.

ABSTRACT: Light energy is converted to chemical energy by two photosystems (PSI and PSII) in complex with their light-harvesting complex proteins (LHCI and LHCII) in photosynthesis. Rhodomonas is a member of cryptophyte alga whose LHCs contain unique chlorophyll a/c proteins (ACPs) and phycobiliproteins. We purified PSI-ACPI and PSII-ACPII supercomplexes from a cryptophyte Rhodomonas sp. NIES-2332 and analyzed their structures at high resolutions of 2.08 Å and 2.17 Å, respectively, using cryo-electron microscopy. These structures are largely similar to those reported previously from two other species of cryptophytes, but exhibited some differences in both the pigment locations and subunit structures. A part of the antenna subunits of both photosystems is shifted compared with th

SUBMITTER: Zhang W 

PROVIDER: S-EPMC12695738 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature