6K61

Cryo-EM structure of the tetrameric photosystem I from a heterocyst-forming cyanobacterium Anabaena sp. PCC7120


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.37 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Structural and functional insights into the tetrameric photosystem I from heterocyst-forming cyanobacteria.

Zheng, L.Li, Y.Li, X.Zhong, Q.Li, N.Zhang, K.Zhang, Y.Chu, H.Ma, C.Li, G.Zhao, J.Gao, N.

(2019) Nat Plants 5: 1087-1097

  • DOI: https://doi.org/10.1038/s41477-019-0525-6
  • Primary Citation of Related Structures:  
    6K61

  • PubMed Abstract: 

    Two large protein-cofactor complexes, photosystem I and photosystem II, are the central components of photosynthesis in the thylakoid membranes. Here, we report the 2.37-Å structure of a tetrameric photosystem I complex from a heterocyst-forming cyanobacterium Anabaena sp. PCC 7120. Four photosystem I monomers, organized in a dimer of dimer, form two distinct interfaces that are largely mediated by specifically orientated polar lipids, such as sulfoquinovosyl diacylglycerol. The structure depicts a more closely connected network of chlorophylls across monomer interfaces than those seen in trimeric PSI from thermophilic cyanobacteria, possibly allowing a more efficient energy transfer between monomers. Our physiological data also revealed a functional link of photosystem I oligomerization to cyclic electron flow and thylakoid membrane organization.


  • Organizational Affiliation

    State Key Laboratory of Membrane Biology, Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, School of Life Sciences, Peking University, Beijing, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I P700 chlorophyll a apoprotein A1A,
M [auth a]
752Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
EC: 1.97.1.12
Membrane Entity: Yes 
UniProt
Find proteins for P58576 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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UniProt GroupP58576
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I 4.8 kDa proteinB [auth X],
N [auth x]
44Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P58566 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I P700 chlorophyll a apoprotein A2 1C [auth B],
O [auth b]
741Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
EC: 1.97.1.12
Membrane Entity: Yes 
UniProt
Find proteins for P58565 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I iron-sulfur centerD [auth C],
P [auth c]
81Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
EC: 1.97.1.12
Membrane Entity: Yes 
UniProt
Find proteins for P0A410 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit IIE [auth D],
Q [auth d]
139Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P58573 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit IVF [auth E],
R [auth e]
70Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P58575 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit IIIG [auth F],
S [auth f]
164Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P58564 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit IXH [auth J],
T [auth j]
49Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P58568 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit PsaK 1I [auth K],
U [auth k]
86Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P58583 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit VIIIJ [auth I],
V [auth i]
46Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P58560 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit XIK [auth L],
W [auth l]
172Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P58577 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit XIIL [auth M],
X [auth m]
32Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q8YNB0 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
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  • Reference Sequence
Small Molecules
Ligands 8 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CLA (Subject of Investigation/LOI)
Query on CLA

Download Ideal Coordinates CCD File 
AA [auth A]
AB [auth A]
AD [auth B]
AF [auth a]
AG [auth a]
CHLOROPHYLL A
C55 H72 Mg N4 O5
ATNHDLDRLWWWCB-AENOIHSZSA-M
CL0 (Subject of Investigation/LOI)
Query on CL0

Download Ideal Coordinates CCD File 
WE [auth a],
Y [auth A]
CHLOROPHYLL A ISOMER
C55 H72 Mg N4 O5
VIQFHHZSLDFWDU-DVXFRRMCSA-M
SQD (Subject of Investigation/LOI)
Query on SQD

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AC [auth X],
PJ [auth l],
WG [auth x],
XG [auth b]
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL
C41 H78 O12 S
RVUUQPKXGDTQPG-JUDHQOGESA-N
LMG (Subject of Investigation/LOI)
Query on LMG

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DC [auth B],
VI [auth b],
ZD [auth B]
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
C45 H86 O10
DCLTVZLYPPIIID-CVELTQQQSA-N
LHG (Subject of Investigation/LOI)
Query on LHG

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CE [auth F]
NJ [auth i]
TG [auth a]
UG [auth a]
XB [auth A]
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
C38 H75 O10 P
BIABMEZBCHDPBV-MPQUPPDSSA-N
BCR (Subject of Investigation/LOI)
Query on BCR

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BJ [auth f]
EE [auth F]
FJ [auth j]
GE [auth F]
GJ [auth j]
BETA-CAROTENE
C40 H56
OENHQHLEOONYIE-JLTXGRSLSA-N
PQN (Subject of Investigation/LOI)
Query on PQN

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LG [auth a],
OI [auth b],
PB [auth A],
SD [auth B]
PHYLLOQUINONE
C31 H46 O2
MBWXNTAXLNYFJB-NKFFZRIASA-N
SF4 (Subject of Investigation/LOI)
Query on SF4

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AE [auth C]
BE [auth C]
MG [auth a]
QB [auth A]
WI [auth c]
IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.37 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (China)--

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-09
    Type: Initial release
  • Version 1.1: 2019-11-20
    Changes: Database references
  • Version 2.0: 2024-03-27
    Changes: Data collection, Database references, Derived calculations, Non-polymer description