Structural Modeling of the Phycobilisome Core and Its Association with the Photosystems

Overview

Journal Photosynth Res

Publisher Springer

Date 2016 Apr 29

PMID 27121945

Citations 9

Authors

D V Zlenko

Pavel M Krasilnikov

Igor N Stadnichuk

Affiliations

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Abstract

The phycobilisome (PBS) is a major light-harvesting complex in cyanobacteria and red algae. To obtain the detailed structure of the hemidiscoidal PBS core composed of allophycocyanin (APC) and minor polypeptide components, we analyzed all nine available 3D structures of APCs from different photosynthetic species and found several variants of crystal packing that potentially correspond to PBS core organization. Combination of face-to-face APC trimer crystal packing with back-to-back APC hexamer packing suggests two variants of the tricylindrical PBS core. To choose one of these structures, a computational model of the PBS core complex and photosystem II (PSII) dimer with minimized distance between the terminal PBS emitters and neighboring antenna chlorophylls was built. In the selected model, the distance between two types of pigments does not exceed 37 Å corresponding to the Förster mechanism of energy transfer. We also propose a model of PBS and photosystem I (PSI) monomer interaction showing a possibility of supercomplex formation and direct energy transfer from the PBS to PSI.

Citing Articles

Molecular glue for phycobilisome attachment to photosystem II in sp. PCC 7002.

Zheng Z, Li X, Wei P, Zhang X, Zhang T, Zhang Z Proc Natl Acad Sci U S A. 2025; 122(4):e2415222122.

PMID: 39847327 PMC: 11789067. DOI: 10.1073/pnas.2415222122.

In situ structural determination of cyanobacterial phycobilisome-PSII supercomplex by STAgSPA strategy.

Zhang X, Xiao Y, You X, Sun S, Sui S Nat Commun. 2024; 15(1):7201.

PMID: 39169020 PMC: 11339077. DOI: 10.1038/s41467-024-51460-0.

Phycobilisomes and Phycobiliproteins in the Pigment Apparatus of Oxygenic Photosynthetics: From Cyanobacteria to Tertiary Endosymbiosis.

Stadnichuk I, Kusnetsov V Int J Mol Sci. 2023; 24(3).

PMID: 36768613 PMC: 9916406. DOI: 10.3390/ijms24032290.

Structure of a dimeric photosystem II complex from a cyanobacterium acclimated to far-red light.

Gisriel C, Shen G, Flesher D, Kurashov V, Golbeck J, Brudvig G J Biol Chem. 2022; 299(1):102815.

PMID: 36549647 PMC: 9843442. DOI: 10.1016/j.jbc.2022.102815.

Trimeric photosystem I facilitates energy transfer from phycobilisomes in Synechocystis sp. PCC 6803.

Akhtar P, Biswas A, Balog-Vig F, Domonkos I, Kovacs L, Lambrev P Plant Physiol. 2022; 189(2):827-838.

PMID: 35302607 PMC: 9157137. DOI: 10.1093/plphys/kiac130.

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