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Structure paper

TitleStructure and quenching of a bundle-shaped phycobilisome.
Journal, issue, pagesSci Adv, Vol. 11, Issue 42, Page eadz6774, Year 2025
Publish dateOct 17, 2025
AuthorsAnna D Burtseva / Yury B Slonimskiy / Timur N Baymukhametov / Maria A Sinetova / Daniil A Gvozdev / Georgy V Tsoraev / Dmitry A Cherepanov / Eugene G Maksimov / Vladimir O Popov / Konstantin M Boyko / Nikolai N Sluchanko /
PubMed AbstractCyanobacteria use soluble antenna megacomplexes, phycobilisomes (PBSs), to maximize light-harvesting efficiency and small photoswitchable orange carotenoid proteins (OCPs) to down-regulate PBSs in ...Cyanobacteria use soluble antenna megacomplexes, phycobilisomes (PBSs), to maximize light-harvesting efficiency and small photoswitchable orange carotenoid proteins (OCPs) to down-regulate PBSs in high light. Among known PBS morphologies, the one from the basal cyanobacterial genus still lacks detailed structural characterization. Here, we reconstructed a cryo-electron microscopy structure of the >10-megadalton PBS, with diverging, conformationally mobile bundles of rods composed of stacked phycoerythrin and phycocyanin hexamers, stemming from a pentacylindrical allophycocyanin core belted by auxiliary phycocyanin hexamers. We show how two -specific multidomain linker proteins, Glr1262 and Glr2806, maintain this bundle-shaped architecture and reveal its differential regulation via nonphotochemical quenching by two OCP types of that recognize separate binding sites within the allophycocyanin core, including lateral cylinders absent in tricylindrical cores.
External linksSci Adv / PubMed:41091862 / PubMed Central
MethodsEM (single particle)
Resolution2.72 - 4.66 Å
Structure data

64812

9v7g

EMDB-64812, PDB-9v7g:
Phycobilisome Rx rod from Gloeobacter violaceus PCC 7421
Method: EM (single particle) / Resolution: 2.72 Å

64813

9v7h

EMDB-64813, PDB-9v7h:
Phycobilisome rod R2 from Gloeobacter violaceus PCC 7421
Method: EM (single particle) / Resolution: 2.95 Å

64814

9v7i

EMDB-64814, PDB-9v7i:
Phycobilisome rod R3 from Gloeobacter violaceus PCC 7421
Method: EM (single particle) / Resolution: 3.03 Å

64815

9v7j

EMDB-64815, PDB-9v7j:
Phycobilisome core from Gloeobacter violaceus PCC 7421
Method: EM (single particle) / Resolution: 2.85 Å

64816

9v7k

EMDB-64816, PDB-9v7k:
Phycobilisome allophycocyanin hexamer C from Gloeobacter violaceus PCC 7421
Method: EM (single particle) / Resolution: 2.94 Å

64817

9v7l

EMDB-64817, PDB-9v7l:
Phycobilisome rod R1 from Gloeobacter violaceus PCC 7421
Method: EM (single particle) / Resolution: 3.76 Å

EMDB-64828: Phycobilisome from Gloeobacter violaceus PCC 7421
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-64851: Phycobilisome from Gloeobacter violaceus PCC 7421, conformation with diverging rods
Method: EM (single particle) / Resolution: 4.25 Å

EMDB-64852: Phycobilisome from Gloeobacter violaceus PCC 7421, conformation with parallel rods
Method: EM (single particle) / Resolution: 4.66 Å

EMDB-64868: Phycobilisome from Gloeobacter violaceus PCC 7421,composite map
Method: EM (single particle) / Resolution: 2.72 Å

Chemicals

ChemComp-CYC:
PHYCOCYANOBILIN

Source
  • gloeobacter violaceus pcc 7421 (bacteria)
KeywordsPHOTOSYNTHESIS / Phycobilisome

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