7FIX | pdb_00007fix

Cryo-EM structure of cyanobacterial photosystem I in the presence of ferredoxin and cytochrome c6

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 1.97 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Structure of cyanobacterial photosystem I complexed with ferredoxin at 1.97 angstrom resolution.

Li, J., Hamaoka, N., Makino, F., Kawamoto, A., Lin, Y., Rogner, M., Nowaczyk, M.M., Lee, Y.H., Namba, K., Gerle, C., Kurisu, G.

(2022) Commun Biol 5: 951-951

  • DOI: https://doi.org/10.1038/s42003-022-03926-4
  • Primary Citation of Related Structures:  
    7FIX

  • PubMed Abstract: 

    Photosystem I (PSI) is a light driven electron pump transferring electrons from Cytochrome c 6 (Cyt c 6 ) to Ferredoxin (Fd). An understanding of this electron transfer process is hampered by a paucity of structural detail concerning PSI:Fd interface and the possible binding sites of Cyt c 6 . Here we describe the high resolution cryo-EM structure of Thermosynechococcus elongatus BP-1 PSI in complex with Fd and a loosely bound Cyt c 6 . Side chain interactions at the PSI:Fd interface including bridging water molecules are visualized in detail. The structure explains the properties of mutants of PsaE and PsaC that affect kinetics of Fd binding and suggests a molecular switch for the dissociation of Fd upon reduction. Calorimetry-based thermodynamic analyses confirms a single binding site for Fd and demonstrates that PSI:Fd complexation is purely driven by entropy. A possible reaction cycle for the efficient transfer of electrons from Cyt c 6 to Fd via PSI is proposed.

    • Organizational Affiliation: 
    • Laboratory for Protein Crystallography, Institute for Protein Research, Osaka University, Suita, Osaka, 565-0871, Japan.

Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I P700 chlorophyll a apoprotein A1A [auth A1],
AA [auth A3],
N [auth A2]		755Thermosynechococcus vestitus BP-1Mutation(s): 0 
EC: 1.97.1.12
Membrane Entity: Yes 
UniProt
Find proteins for P0A405 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I P700 chlorophyll a apoprotein A2B [auth B1],
BA [auth B3],
O [auth B2]		741Thermosynechococcus vestitus BP-1Mutation(s): 0 
EC: 1.97.1.12
Membrane Entity: Yes 
UniProt
Find proteins for P0A407 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I iron-sulfur centerC [auth C1],
CA [auth C3],
P [auth C2]		81Thermosynechococcus vestitus BP-1Mutation(s): 0 
EC: 1.97.1.12
Membrane Entity: Yes 
UniProt
Find proteins for P0A415 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit IID [auth D1],
DA [auth D3],
Q [auth D2]		139Thermosynechococcus vestitus BP-1Mutation(s): 0 
UniProt
Find proteins for P0A420 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit IVE [auth E1],
EA [auth E3],
R [auth E2]		76Thermosynechococcus vestitus BP-1Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0A423 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit IIIF [auth F1],
FA [auth F3],
S [auth F2]		174Thermosynechococcus vestitus BP-1Mutation(s): 0 
Gene Names: psaF, tlr2411
Membrane Entity: Yes 
UniProt
Find proteins for P0A401 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit VIIIG [auth I1],
GA [auth I3],
T [auth I2]		38Thermosynechococcus vestitus BP-1Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0A427 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit IXH [auth J1],
HA [auth J3],
U [auth J2]		41Thermosynechococcus vestitus BP-1Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0A429 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit PsaKI [auth K1],
IA [auth K3],
V [auth K2]		83Thermosynechococcus vestitus BP-1Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0A425 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit XIJ [auth L1],
JA [auth L3],
W [auth L2]		155Thermosynechococcus vestitus BP-1Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q8DGB4 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I reaction center subunit XIIK [auth M1],
KA [auth M3],
X [auth M2]		31Thermosynechococcus vestitus BP-1Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0A403 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
Ferredoxin-1L [auth R1],
LA [auth R3],
Y [auth R2]		98Thermosynechococcus vestitus BP-1Mutation(s): 0 
Gene Names: petF1, petF
UniProt
Find proteins for P0A3C9 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
Photosystem I 4.8K proteinM [auth X1],
MA [auth X3],
Z [auth X2]		39Thermosynechococcus vestitus BP-1Mutation(s): 0 
Gene Names: tsr0813
Membrane Entity: Yes 
UniProt
Find proteins for Q8DKP6 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
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Small Molecules
Ligands 10 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
DGD (Subject of Investigation/LOI)
Query on DGD
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EQ [auth B3],
MK [auth B2],
TE [auth B1]		DIGALACTOSYL DIACYL GLYCEROL (DGDG)
C51 H96 O15
LDQFLSUQYHBXSX-HXXRYREZSA-N
CL0 (Subject of Investigation/LOI)
Query on CL0
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GG [auth A2],
NA [auth A1],
YL [auth A3]		CHLOROPHYLL A ISOMER
C55 H72 Mg N4 O5
VIQFHHZSLDFWDU-DVXFRRMCSA-M
CLA (Subject of Investigation/LOI)
Query on CLA
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AB [auth A1]
AC [auth A1]
AD [auth B1]
AE [auth B1]
AH [auth A2]
AB [auth A1],
AC [auth A1],
AD [auth B1],
AE [auth B1],
AH [auth A2],
AJ [auth B2],
AK [auth B2],
AL [auth J2],
AM [auth A3],
AN [auth A3],
AP [auth B3],
BB [auth A1],
BC [auth A1],
BD [auth B1],
BE [auth B1],
BH [auth A2],
BJ [auth B2],
BK [auth B2],
BM [auth A3],
BN [auth A3],
BO [auth A3],
BP [auth B3],
BR [auth L3],
CB [auth A1],
CC [auth A1],
CD [auth B1],
CE [auth B1],
CH [auth A2],
CJ [auth B2],
CK [auth B2],
CM [auth A3],
CN [auth A3],
CP [auth B3],
CR [auth L3],
DB [auth A1],
DC [auth A1],
DD [auth B1],
DE [auth B1],
DH [auth A2],
DJ [auth B2],
DK [auth B2],
DM [auth A3],
DN [auth A3],
DP [auth B3],
DR [auth L3],
EB [auth A1],
EC [auth A1],
ED [auth B1],
EE [auth B1],
EH [auth A2],
EJ [auth B2],
EL [auth J2],
EM [auth A3],
EN [auth A3],
EP [auth B3],
FB [auth A1],
FD [auth B1],
FE [auth B1],
FF [auth J1],
FG [auth X1],
FH [auth A2],
FJ [auth B2],
FL [auth K2],
FM [auth A3],
FN [auth A3],
FP [auth B3],
FQ [auth B3],
GB [auth A1],
GD [auth B1],
GE [auth B1],
GF [auth J1],
GH [auth A2],
GJ [auth B2],
GM [auth A3],
GN [auth A3],
GP [auth B3],
HB [auth A1],
HD [auth B1],
HE [auth B1],
HF [auth J1],
HG [auth A2],
HH [auth A2],
HJ [auth B2],
HL [auth K2],
HM [auth A3],
HN [auth A3],
HP [auth B3],
IB [auth A1],
ID [auth B1],
IE [auth B1],
IG [auth A2],
IH [auth A2],
IJ [auth B2],
IM [auth A3],
IN [auth A3],
IP [auth B3],
JB [auth A1],
JD [auth B1],
JE [auth B1],
JG [auth A2],
JH [auth A2],
JI [auth A2],
JJ [auth B2],
JL [auth L2],
JM [auth A3],
JN [auth A3],
JO [auth B3],
JP [auth B3],
JQ [auth I3],
KB [auth A1],
KD [auth B1],
KE [auth B1],
KG [auth A2],
KH [auth A2],
KJ [auth B2],
KL [auth L2],
KM [auth A3],
KN [auth A3],
KO [auth B3],
KP [auth B3],
LB [auth A1],
LD [auth B1],
LF [auth J1],
LG [auth A2],
LH [auth A2],
LJ [auth B2],
LL [auth L2],
LM [auth A3],
LN [auth A3],
LO [auth B3],
LP [auth B3],
MB [auth A1],
MD [auth B1],
MF [auth K1],
MG [auth A2],
MH [auth A2],
MJ [auth B2],
MM [auth A3],
MN [auth A3],
MO [auth B3],
MP [auth B3],
NB [auth A1],
ND [auth B1],
NG [auth A2],
NH [auth A2],
NJ [auth B2],
NK [auth B2],
NM [auth A3],
NN [auth A3],
NO [auth B3],
NP [auth B3],
OA [auth A1],
OB [auth A1],
OD [auth B1],
OF [auth K1],
OG [auth A2],
OH [auth A2],
OJ [auth B2],
OM [auth A3],
ON [auth A3],
OO [auth B3],
OP [auth B3],
OR [auth X3],
PA [auth A1],
PB [auth A1],
PD [auth B1],
PG [auth A2],
PH [auth A2],
PJ [auth B2],
PM [auth A3],
PN [auth A3],
PO [auth B3],
PP [auth B3],
QA [auth A1],
QB [auth A1],
QC [auth A1],
QD [auth B1],
QF [auth L1],
QG [auth A2],
QH [auth A2],
QJ [auth B2],
QM [auth A3],
QO [auth B3],
QP [auth B3],
QQ [auth J3],
RA [auth A1],
RB [auth A1],
RD [auth B1],
RF [auth L1],
RG [auth A2],
RH [auth A2],
RI [auth B2],
RJ [auth B2],
RK [auth I2],
RM [auth A3],
RO [auth B3],
RP [auth B3],
RQ [auth J3],
SA [auth A1],
SB [auth A1],
SD [auth B1],
SF [auth L1],
SG [auth A2],
SH [auth A2],
SI [auth B2],
SJ [auth B2],
SM [auth A3],
SO [auth B3],
SP [auth B3],
SQ [auth J3],
TA [auth A1],
TB [auth A1],
TD [auth B1],
TG [auth A2],
TH [auth A2],
TI [auth B2],
TJ [auth B2],
TM [auth A3],
TO [auth B3],
TP [auth B3],
UA [auth A1],
UB [auth A1],
UD [auth B1],
UE [auth B1],
UG [auth A2],
UH [auth A2],
UI [auth B2],
UJ [auth B2],
UM [auth A3],
UO [auth B3],
UP [auth B3],
VA [auth A1],
VB [auth A1],
VD [auth B1],
VG [auth A2],
VH [auth A2],
VI [auth B2],
VJ [auth B2],
VM [auth A3],
VO [auth B3],
VP [auth B3],
WA [auth A1],
WB [auth A1],
WD [auth B1],
WG [auth A2],
WH [auth A2],
WI [auth B2],
WJ [auth B2],
WM [auth A3],
WO [auth B3],
WQ [auth J3],
XA [auth A1],
XB [auth A1],
XD [auth B1],
XG [auth A2],
XH [auth A2],
XI [auth B2],
XJ [auth B2],
XL [auth X2],
XM [auth A3],
XO [auth B3],
XQ [auth K3],
YA [auth A1],
YB [auth A1],
YC [auth B1],
YD [auth B1],
YE [auth I1],
YG [auth A2],
YI [auth B2],
YJ [auth B2],
YK [auth J2],
YM [auth A3],
YO [auth B3],
ZA [auth A1],
ZB [auth A1],
ZC [auth B1],
ZD [auth B1],
ZG [auth A2],
ZI [auth B2],
ZJ [auth B2],
ZK [auth J2],
ZL [auth A3],
ZM [auth A3],
ZO [auth B3],
ZQ [auth K3]
CHLOROPHYLL A
C55 H72 Mg N4 O5
ATNHDLDRLWWWCB-AENOIHSZSA-M
LHG (Subject of Investigation/LOI)
Query on LHG
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EG [auth X1]
GI [auth A2]
HI [auth A2]
NC [auth A1]
NR [auth X3]
EG [auth X1],
GI [auth A2],
HI [auth A2],
NC [auth A1],
NR [auth X3],
OC [auth A1],
WL [auth X2],
YN [auth A3],
ZN [auth A3]
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
C38 H75 O10 P
BIABMEZBCHDPBV-MPQUPPDSSA-N
BCR (Subject of Investigation/LOI)
Query on BCR
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AF [auth I1]
AG [auth M1]
AI [auth A2]
AO [auth A3]
AQ [auth B3]
AF [auth I1],
AG [auth M1],
AI [auth A2],
AO [auth A3],
AQ [auth B3],
BI [auth A2],
BL [auth J2],
BQ [auth B3],
CI [auth A2],
CL [auth J2],
CQ [auth B3],
DI [auth A2],
DL [auth J2],
DQ [auth B3],
EI [auth A2],
ER [auth L3],
FI [auth A2],
FK [auth B2],
GK [auth B2],
GL [auth K2],
HC [auth A1],
HK [auth B2],
IC [auth A1],
IF [auth J1],
II [auth A2],
IK [auth B2],
IQ [auth F3],
JC [auth A1],
JF [auth J1],
JK [auth B2],
JR [auth M3],
KC [auth A1],
KF [auth J1],
KK [auth B2],
KQ [auth I3],
LC [auth A1],
LK [auth B2],
LQ [auth I3],
MC [auth A1],
ME [auth B1],
ML [auth L2],
NE [auth B1],
NF [auth K1],
OE [auth B1],
PC [auth A1],
PE [auth B1],
QE [auth B1],
QK [auth F2],
RE [auth B1],
RL [auth L2],
SE [auth B1],
SK [auth I2],
SL [auth M2],
SN [auth A3],
TF [auth L1],
TK [auth I2],
TN [auth A3],
TQ [auth J3],
UF [auth L1],
UN [auth A3],
UQ [auth J3],
VN [auth A3],
VQ [auth J3],
WN [auth A3],
XE [auth F1],
XN [auth A3],
XP [auth B3],
YP [auth B3],
YQ [auth K3],
ZE [auth I1],
ZF [auth L1],
ZP [auth B3]
BETA-CAROTENE
C40 H56
OENHQHLEOONYIE-JLTXGRSLSA-N
PQN (Subject of Investigation/LOI)
Query on PQN
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EK [auth B2]
FC [auth A1]
LE [auth B1]
QN [auth A3]
WP [auth B3]
EK [auth B2],
FC [auth A1],
LE [auth B1],
QN [auth A3],
WP [auth B3],
YH [auth A2]
PHYLLOQUINONE
C31 H46 O2
MBWXNTAXLNYFJB-NKFFZRIASA-N
SF4 (Subject of Investigation/LOI)
Query on SF4
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GC [auth A1]
GQ [auth C3]
HQ [auth C3]
OK [auth C2]
PK [auth C2]
GC [auth A1],
GQ [auth C3],
HQ [auth C3],
OK [auth C2],
PK [auth C2],
RN [auth A3],
VE [auth C1],
WE [auth C1],
ZH [auth A2]
IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-UHFFFAOYSA-N
GAK (Subject of Investigation/LOI)
Query on GAK
Download Ideal Coordinates CCD File 
DG [auth R1],
MR [auth R3],
VL [auth R2]		[2Ga-2S] cluster
Ga2 S2
VXAXRCXBFUALTA-UHFFFAOYSA-N
CA (Subject of Investigation/LOI)
Query on CA
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AR [auth L3],
IL [auth L2],
PF [auth L1]		CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
UNL (Subject of Investigation/LOI)
Query on UNL
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BF [auth I1]
BG [auth M1]
CF [auth I1]
CG [auth M1]
CO [auth A3]
BF [auth I1],
BG [auth M1],
CF [auth I1],
CG [auth M1],
CO [auth A3],
DF [auth I1],
DO [auth A3],
EF [auth I1],
EO [auth A3],
FO [auth A3],
FR [auth L3],
GO [auth A3],
GR [auth L3],
HO [auth A3],
HR [auth L3],
IO [auth A3],
IR [auth L3],
KI [auth A2],
KR [auth M3],
LI [auth A2],
LR [auth M3],
MI [auth A2],
MQ [auth I3],
NI [auth A2],
NL [auth L2],
NQ [auth I3],
OI [auth A2],
OL [auth L2],
OQ [auth I3],
PI [auth A2],
PL [auth L2],
PQ [auth I3],
QI [auth A2],
QL [auth L2],
RC [auth A1],
SC [auth A1],
TC [auth A1],
TL [auth M2],
UC [auth A1],
UK [auth I2],
UL [auth M2],
VC [auth A1],
VF [auth L1],
VK [auth I2],
WC [auth A1],
WF [auth L1],
WK [auth I2],
XC [auth A1],
XF [auth L1],
XK [auth I2],
YF [auth L1]
Unknown ligand
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 1.97 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2022-09-21
    Type: Initial release
  • Version 1.1: 2022-09-28
    Changes: Database references
  • Version 1.2: 2024-11-06
    Changes: Data collection, Structure summary