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- PDB-8tro: Rod from high-resolution phycobilisome quenched by OCP (local ref... -

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Basic information

Entry
Database: PDB / ID: 8tro
TitleRod from high-resolution phycobilisome quenched by OCP (local refinement)
Components
  • (C-phycocyanin ...) x 2
  • (Phycobilisome ...) x 4
KeywordsPHOTOSYNTHESIS / Complex / light harvesting / pigment
Function / homology
Function and homology information


phycobilisome / plasma membrane-derived thylakoid membrane / photosynthesis
Similarity search - Function
Phycobilisome linker protein / Phycobilisome linker domain / Phycobilisome linker domain superfamily / Phycobilisome Linker polypeptide / Phycobilisome (PBS) linker domain profile. / Phycocyanin, alpha subunit / Phycocyanin, beta subunit / CpcD-like domain / CpcD/allophycocyanin linker domain / CpcD-like domain profile. ...Phycobilisome linker protein / Phycobilisome linker domain / Phycobilisome linker domain superfamily / Phycobilisome Linker polypeptide / Phycobilisome (PBS) linker domain profile. / Phycocyanin, alpha subunit / Phycocyanin, beta subunit / CpcD-like domain / CpcD/allophycocyanin linker domain / CpcD-like domain profile. / CpcD/allophycocyanin linker domain / Phycobilisome, alpha/beta subunit / Phycobilisome, alpha/beta subunit superfamily / Phycobilisome protein / Globin-like superfamily
Similarity search - Domain/homology
PHYCOCYANOBILIN / Phycobilisome rod-core linker polypeptide CpcG / Phycobilisome 8.9 kDa linker polypeptide, phycocyanin-associated, rod / Phycobilisome 32.1 kDa linker polypeptide, phycocyanin-associated, rod 1 / Phycobilisome 32.1 kDa linker polypeptide, phycocyanin-associated, rod 2 / C-phycocyanin beta subunit / C-phycocyanin alpha subunit
Similarity search - Component
Biological speciesSynechocystis sp. PCC 6803 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 1.9 Å
AuthorsSauer, P.V. / Sutter, M. / Cupellini, L.
Funding support United States, European Union, Czech Republic, 4items
OrganizationGrant numberCountry
Department of Energy (DOE, United States)DE-SC0020606 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM127018 United States
European Research Council (ERC)786714European Union
Czech Science Foundation19-28323X Czech Republic
CitationJournal: Sci Adv / Year: 2024
Title: Structural and quantum chemical basis for OCP-mediated quenching of phycobilisomes.
Authors: Paul V Sauer / Lorenzo Cupellini / Markus Sutter / Mattia Bondanza / María Agustina Domínguez Martin / Henning Kirst / David Bína / Adrian Fujiet Koh / Abhay Kotecha / Basil J Greber / ...Authors: Paul V Sauer / Lorenzo Cupellini / Markus Sutter / Mattia Bondanza / María Agustina Domínguez Martin / Henning Kirst / David Bína / Adrian Fujiet Koh / Abhay Kotecha / Basil J Greber / Eva Nogales / Tomáš Polívka / Benedetta Mennucci / Cheryl A Kerfeld /
Abstract: Cyanobacteria use large antenna complexes called phycobilisomes (PBSs) for light harvesting. However, intense light triggers non-photochemical quenching, where the orange carotenoid protein (OCP) ...Cyanobacteria use large antenna complexes called phycobilisomes (PBSs) for light harvesting. However, intense light triggers non-photochemical quenching, where the orange carotenoid protein (OCP) binds to PBS, dissipating excess energy as heat. The mechanism of efficiently transferring energy from phycocyanobilins in PBS to canthaxanthin in OCP remains insufficiently understood. Using cryo-electron microscopy, we unveiled the OCP-PBS complex structure at 1.6- to 2.1-angstrom resolution, showcasing its inherent flexibility. Using multiscale quantum chemistry, we disclosed the quenching mechanism. Identifying key protein residues, we clarified how canthaxanthin's transition dipole moment in its lowest-energy dark state becomes large enough for efficient energy transfer from phycocyanobilins. Our energy transfer model offers a detailed understanding of the atomic determinants of light harvesting regulation and antenna architecture in cyanobacteria.
History
DepositionAug 9, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 17, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
0: C-phycocyanin alpha subunit
1: C-phycocyanin beta subunit
2: C-phycocyanin alpha subunit
3: C-phycocyanin beta subunit
4: C-phycocyanin alpha subunit
5: C-phycocyanin beta subunit
6: C-phycocyanin alpha subunit
7: C-phycocyanin beta subunit
8: C-phycocyanin alpha subunit
9: C-phycocyanin beta subunit
A: C-phycocyanin alpha subunit
B: C-phycocyanin beta subunit
C: C-phycocyanin alpha subunit
D: C-phycocyanin beta subunit
E: C-phycocyanin alpha subunit
F: C-phycocyanin beta subunit
G: C-phycocyanin alpha subunit
H: C-phycocyanin beta subunit
I: C-phycocyanin alpha subunit
J: C-phycocyanin beta subunit
K: C-phycocyanin alpha subunit
L: C-phycocyanin beta subunit
M: C-phycocyanin alpha subunit
N: C-phycocyanin beta subunit
O: C-phycocyanin alpha subunit
P: C-phycocyanin beta subunit
Q: C-phycocyanin alpha subunit
R: C-phycocyanin beta subunit
S: C-phycocyanin alpha subunit
T: C-phycocyanin beta subunit
U: C-phycocyanin alpha subunit
V: C-phycocyanin beta subunit
W: C-phycocyanin alpha subunit
X: C-phycocyanin beta subunit
Y: C-phycocyanin alpha subunit
Z: C-phycocyanin beta subunit
a: Phycobilisome rod-core linker polypeptide CpcG
b: Phycobilisome 32.1 kDa linker polypeptide, phycocyanin-associated, rod 1
c: Phycobilisome 32.1 kDa linker polypeptide, phycocyanin-associated, rod 2
d: Phycobilisome 8.9 kDa linker polypeptide, phycocyanin-associated, rod
hetero molecules


Theoretical massNumber of molelcules
Total (without water)777,11894
Polymers745,32940
Non-polymers31,78954
Water61,1793396
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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C-phycocyanin ... , 2 types, 36 molecules 02468ACEGIKMOQSUWY13579BDFHJLN...

#1: Protein
C-phycocyanin alpha subunit


Mass: 17602.529 Da / Num. of mol.: 18 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: Q54715
#2: Protein
C-phycocyanin beta subunit


Mass: 18156.451 Da / Num. of mol.: 18 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: Q54714

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Phycobilisome ... , 4 types, 4 molecules abcd

#3: Protein Phycobilisome rod-core linker polypeptide CpcG


Mass: 28938.758 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P73093
#4: Protein Phycobilisome 32.1 kDa linker polypeptide, phycocyanin-associated, rod 1


Mass: 32558.607 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P73203
#5: Protein Phycobilisome 32.1 kDa linker polypeptide, phycocyanin-associated, rod 2


Mass: 30836.346 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P73204
#6: Protein Phycobilisome 8.9 kDa linker polypeptide, phycocyanin-associated, rod


Mass: 9333.342 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P73202

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Non-polymers , 2 types, 3450 molecules

#7: Chemical...
ChemComp-CYC / PHYCOCYANOBILIN / Phycocyanobilin


Mass: 588.694 Da / Num. of mol.: 54 / Source method: obtained synthetically / Formula: C33H40N4O6 / Feature type: SUBJECT OF INVESTIGATION
#8: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 3396 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Phycobilisome bound to OCP / Type: COMPLEX / Entity ID: #1-#6 / Source: NATURAL
Source (natural)Organism: Synechocystis sp. PCC 6803 (bacteria)
Buffer solutionpH: 7.4
SpecimenConc.: 3.8 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE-PROPANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1200 nm / Nominal defocus min: 400 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 1.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 435854 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 9.16 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.003855042
ELECTRON MICROSCOPYf_angle_d0.653574866
ELECTRON MICROSCOPYf_chiral_restr0.0428180
ELECTRON MICROSCOPYf_plane_restr0.005511372
ELECTRON MICROSCOPYf_dihedral_angle_d5.82519510

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