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Entry
Database: PDB / ID: 9eh5
TitleStructure of a mutated photosystem II complex reveals changes to the hydrogen-bonding network that affect proton egress during O-O bond formation
Components
  • (Cytochrome b559 subunit ...) x 2
  • (Photosystem II ...) x 17
  • Cytochrome c-550
  • Sll1638 protein
KeywordsPHOTOSYNTHESIS / photosystem II / oxygen-evolving complex / transition metals / metalloenzyme / mutagenesis / water channel / hydrogen-bond network
Function / homology
Function and homology information


plasma membrane-derived thylakoid photosystem II / photosystem II oxygen evolving complex / photosystem II assembly / oxygen evolving activity / photosystem II stabilization / photosystem II reaction center / photosystem II / oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor / photosynthetic electron transport chain / photosystem II ...plasma membrane-derived thylakoid photosystem II / photosystem II oxygen evolving complex / photosystem II assembly / oxygen evolving activity / photosystem II stabilization / photosystem II reaction center / photosystem II / oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor / photosynthetic electron transport chain / photosystem II / response to herbicide / extrinsic component of membrane / chlorophyll binding / plasma membrane-derived thylakoid membrane / photosynthetic electron transport in photosystem II / : / phosphate ion binding / photosynthesis, light reaction / photosynthesis / respiratory electron transport chain / manganese ion binding / electron transfer activity / protein stabilization / iron ion binding / heme binding / calcium ion binding / metal ion binding / identical protein binding
Similarity search - Function
Photosystem II PsbQ, cyanobacteria / Oxygen-evolving enhancer protein 3 / Oxygen evolving enhancer protein 3 / PsbQ-like domain superfamily / Photosystem II protein Y (PsbY) / Photosystem II PsbY / Photosystem II PsbU, oxygen evolving complex / Photosystem II 12 kDa extrinsic protein (PsbU) / Photosystem II PsbV, cytochrome c-550 precursor / Photosystem II cytochrome c-550 precursor ...Photosystem II PsbQ, cyanobacteria / Oxygen-evolving enhancer protein 3 / Oxygen evolving enhancer protein 3 / PsbQ-like domain superfamily / Photosystem II protein Y (PsbY) / Photosystem II PsbY / Photosystem II PsbU, oxygen evolving complex / Photosystem II 12 kDa extrinsic protein (PsbU) / Photosystem II PsbV, cytochrome c-550 precursor / Photosystem II cytochrome c-550 precursor / Cytochrome c-550 domain / Cytochrome c-550 domain / Photosystem II PsbJ / Photosystem II PsbJ superfamily / PsbJ / Photosystem II PsbX, type 1 subfamily / Photosystem II PsbO, manganese-stabilising / Manganese-stabilising protein / photosystem II polypeptide / Photosystem II reaction centre protein Ycf12 / Photosystem II complex subunit Ycf12 / Photosystem II reaction centre M protein (PsbM) / Photosystem II PsbM superfamily / Photosystem II PsbM / Photosystem II PsbZ, reaction centre / Photosystem II PsbZ superfamily / YCF9 / Photosystem II PsbX / Photosystem II reaction centre X protein (PsbX) / Photosystem II PsbT / Photosystem II PsbL / Photosystem II PsbL superfamily / Photosystem II PsbT superfamily / Photosystem II reaction centre T protein / PsbL protein / Photosystem II PsbK / Photosystem II CP43 reaction centre protein / Photosystem II PsbK superfamily / Photosystem II CP43 reaction centre protein superfamily / Photosystem II 4 kDa reaction centre component / Photosystem II PsbI / Photosystem II CP47 reaction centre protein / Photosystem II PsbI superfamily / Photosystem II reaction centre I protein (PSII 4.8 kDa protein) / Photosystem II reaction centre protein H / Photosystem II reaction centre protein H superfamily / Photosystem II 10 kDa phosphoprotein / Photosystem II protein D1 / Photosystem II D2 protein / Photosystem II cytochrome b559, conserved site / Photosystem II cytochrome b559, alpha subunit / Photosystem II cytochrome b559, beta subunit / Photosystem II cytochrome b559, N-terminal / Photosystem II cytochrome b559, alpha subunit, lumenal region / Photosystem II cytochrome b559, alpha subunit superfamily / Cytochrome b559, alpha (gene psbE) and beta (gene psbF)subunits / Lumenal portion of Cytochrome b559, alpha (gene psbE) subunit / Cytochrome b559 subunits heme-binding site signature. / : / Photosystem antenna protein-like / Photosystem antenna protein-like superfamily / Photosystem II protein / Outer membrane protein/outer membrane enzyme PagP, beta-barrel / : / Photosynthetic reaction centre, L/M / Photosystem II protein D1/D2 superfamily / Photosynthetic reaction centre protein / Photosynthetic reaction center proteins signature. / Cytochrome c family profile. / Cytochrome c-like domain / Cytochrome c-like domain superfamily / Prokaryotic membrane lipoprotein lipid attachment site profile.
Similarity search - Domain/homology
BETA-CAROTENE / BICARBONATE ION / CHLOROPHYLL A / DIGALACTOSYL DIACYL GLYCEROL (DGDG) / : / PROTOPORPHYRIN IX CONTAINING FE / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE / CA-MN4-O5 CLUSTER / PHEOPHYTIN A ...BETA-CAROTENE / BICARBONATE ION / CHLOROPHYLL A / DIGALACTOSYL DIACYL GLYCEROL (DGDG) / : / PROTOPORPHYRIN IX CONTAINING FE / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE / CA-MN4-O5 CLUSTER / PHEOPHYTIN A / Chem-PL9 / (3R)-beta,beta-caroten-3-ol / Chem-SQD / Photosystem II CP47 reaction center protein / Cytochrome b559 subunit alpha / Cytochrome b559 subunit beta / Photosystem II D2 protein / Photosystem II CP43 reaction center protein / Photosystem II extrinsic protein O / Photosystem II reaction center protein H / Photosystem II reaction center protein K / Photosystem II protein D1 2 / Photosystem II reaction center protein X / Photosystem II reaction center protein M / CyanoQ / Photosystem II reaction center protein J / Photosystem II reaction center protein Z / Photosystem II reaction center protein Y / Photosystem II reaction center protein T / Photosystem II reaction center protein I / Photosystem II extrinsic protein V / Photosystem II extrinsic protein U / Photosystem II reaction center protein L / Photosystem II reaction center protein Psb30
Similarity search - Component
Biological speciesSynechocystis sp. PCC 6803 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 1.97 Å
AuthorsFlesher, D.A. / Shin, J. / Debus, R.J. / Brudvig, G.W.
Funding support United States, 1items
OrganizationGrant numberCountry
Department of Energy (DOE, United States) United States
CitationJournal: J Biol Chem / Year: 2025
Title: Structure of a mutated photosystem II complex reveals changes to the hydrogen-bonding network that affect proton egress during O-O bond formation.
Authors: David A Flesher / Jieun Shin / Richard J Debus / Gary W Brudvig /
Abstract: Photosystem II (PSII) is the water-splitting enzyme of oxygenic photosynthesis. Using light energy, PSII catalytically oxidizes two water molecules to fuel downstream metabolism, forming an O-O bond ...Photosystem II (PSII) is the water-splitting enzyme of oxygenic photosynthesis. Using light energy, PSII catalytically oxidizes two water molecules to fuel downstream metabolism, forming an O-O bond and releasing O as a byproduct. The reaction mechanism requires the strategic removal of four protons via conserved hydrogen-bonding networks, but these pathways remain poorly understood. Site-directed mutagenesis has been used to study these pathways and the role of specific side chains, such as Lys317 of the D2 subunit. Previous studies showed that the D2-Lys317Ala substitution, which abolishes the flexible hydrogen-bonding -NH group, resulted in delayed O release kinetics and diminished catalytic turnover, suggesting Lys317 has a crucial role in facilitating proton egress. Here, we investigated this proton egress pathway by determining the cryo-EM structure of PSII containing the D2-Lys317Ala substitution at a resolution of 1.97 Å. We observed that four new water molecules fill the space previously occupied by Lys317, but these waters lack specific water-protein interactions, leading to heterogeneity and suboptimal hydrogen bonding. We hypothesize that these waters negatively contribute to the existing hydrogen-bonding network and increase the entropic barrier for proton transfer. Additionally, we observed that a conserved chloride ion (Cl1), which is associated with Lys317, is unexpectedly maintained in D2-Lys317Ala PSII. However, unlike in wild-type, Cl1 has no measured effect on oxygen-evolution rates in D2-Lys317Ala PSII. This suggests that the role of Cl1 is dependent on the Lys317 amino group. These findings provide new insight into proton egress through the Cl1 hydrogen-bonding channel.
History
DepositionNov 22, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 19, 2025Provider: repository / Type: Initial release
Revision 1.1Mar 19, 2025Group: Data collection / Database references / Category: citation / em_admin / Item: _citation.journal_volume / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Photosystem II protein D1 2
B: Photosystem II CP47 reaction center protein
C: Photosystem II CP43 reaction center protein
D: Photosystem II D2 protein
E: Cytochrome b559 subunit alpha
F: Cytochrome b559 subunit beta
H: Photosystem II reaction center protein H
I: Photosystem II reaction center protein I
J: Photosystem II reaction center protein J
K: Photosystem II reaction center protein K
L: Photosystem II reaction center protein L
M: Photosystem II reaction center protein M
O: Photosystem II manganese-stabilizing polypeptide
Q: Sll1638 protein
R: Photosystem II protein Y
T: Photosystem II reaction center protein T
U: Photosystem II 12 kDa extrinsic protein
V: Cytochrome c-550
X: Photosystem II reaction center X protein
Y: Photosystem II reaction center protein Ycf12
Z: Photosystem II reaction center protein Z
a: Photosystem II protein D1 2
b: Photosystem II CP47 reaction center protein
c: Photosystem II CP43 reaction center protein
d: Photosystem II D2 protein
e: Cytochrome b559 subunit alpha
f: Cytochrome b559 subunit beta
h: Photosystem II reaction center protein H
i: Photosystem II reaction center protein I
j: Photosystem II reaction center protein J
k: Photosystem II reaction center protein K
l: Photosystem II reaction center protein L
m: Photosystem II reaction center protein M
o: Photosystem II manganese-stabilizing polypeptide
q: Sll1638 protein
r: Photosystem II protein Y
t: Photosystem II reaction center protein T
u: Photosystem II 12 kDa extrinsic protein
v: Cytochrome c-550
x: Photosystem II reaction center X protein
y: Photosystem II reaction center protein Ycf12
z: Photosystem II reaction center protein Z
hetero molecules


Theoretical massNumber of molelcules
Total (without water)816,308278
Polymers657,60942
Non-polymers158,700236
Water23,3111294
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Photosystem II ... , 17 types, 34 molecules AaBbCcDdHhIiJjKkLlMmOoRrTtUuXx...

#1: Protein Photosystem II protein D1 2 / PSII D1 protein 2 / Photosystem II Q(B) protein 2


Mass: 38280.531 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P16033, photosystem II
#2: Protein Photosystem II CP47 reaction center protein


Mass: 55954.355 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P05429
#3: Protein Photosystem II CP43 reaction center protein


Mass: 50344.723 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P09193
#4: Protein Photosystem II D2 protein / PSII D2 protein / Photosystem Q(A) protein


Mass: 39461.137 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P09192, photosystem II
#7: Protein Photosystem II reaction center protein H


Mass: 7120.404 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P14835
#8: Protein/peptide Photosystem II reaction center protein I


Mass: 4338.119 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: Q54697
#9: Protein/peptide Photosystem II reaction center protein J


Mass: 3976.687 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P73070
#10: Protein/peptide Photosystem II reaction center protein K


Mass: 5114.127 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P15819
#11: Protein/peptide Photosystem II reaction center protein L


Mass: 4476.145 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: Q55354
#12: Protein/peptide Photosystem II reaction center protein M


Mass: 3910.639 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P72701
#13: Protein Photosystem II manganese-stabilizing polypeptide


Mass: 29939.584 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P10549
#15: Protein/peptide Photosystem II protein Y


Mass: 4204.958 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P73676
#16: Protein/peptide Photosystem II reaction center protein T


Mass: 3571.318 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P74787
#17: Protein Photosystem II 12 kDa extrinsic protein


Mass: 14256.163 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: Q55332
#19: Protein/peptide Photosystem II reaction center X protein


Mass: 4189.036 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P72575
#20: Protein/peptide Photosystem II reaction center protein Ycf12


Mass: 4143.993 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: Q55438
#21: Protein Photosystem II reaction center protein Z


Mass: 6736.161 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P73528

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Cytochrome b559 subunit ... , 2 types, 4 molecules EeFf

#5: Protein Cytochrome b559 subunit alpha


Mass: 9454.577 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P09190
#6: Protein/peptide Cytochrome b559 subunit beta


Mass: 4935.784 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P09191

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Protein , 2 types, 4 molecules QqVv

#14: Protein Sll1638 protein


Mass: 16494.934 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P73048
#18: Protein Cytochrome c-550


Mass: 17901.045 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: Q55013

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Sugars , 2 types, 74 molecules

#31: Sugar...
ChemComp-LMT / DODECYL-BETA-D-MALTOSIDE


Type: D-saccharide / Mass: 510.615 Da / Num. of mol.: 66 / Source method: obtained synthetically / Formula: C24H46O11 / Comment: detergent*YM
#34: Sugar
ChemComp-DGD / DIGALACTOSYL DIACYL GLYCEROL (DGDG)


Type: saccharide / Mass: 949.299 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: C51H96O15

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Non-polymers , 15 types, 1456 molecules

#22: Chemical ChemComp-OEX / CA-MN4-O5 CLUSTER


Mass: 339.827 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: CaMn4O5
#23: Chemical ChemComp-FE2 / FE (II) ION


Mass: 55.845 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe
#24: Chemical
ChemComp-CL / CHLORIDE ION


Mass: 35.453 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Cl / Feature type: SUBJECT OF INVESTIGATION
#25: Chemical...
ChemComp-CLA / CHLOROPHYLL A


Mass: 893.489 Da / Num. of mol.: 70 / Source method: obtained synthetically / Formula: C55H72MgN4O5
#26: Chemical
ChemComp-PHO / PHEOPHYTIN A


Mass: 871.200 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C55H74N4O5
#27: Chemical
ChemComp-BCR / BETA-CAROTENE


Mass: 536.873 Da / Num. of mol.: 18 / Source method: obtained synthetically / Formula: C40H56
#28: Chemical
ChemComp-LMG / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE


Mass: 787.158 Da / Num. of mol.: 16 / Source method: obtained synthetically / Formula: C45H86O10
#29: Chemical
ChemComp-PL9 / 2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE / PLASTOQUINONE 9


Mass: 749.201 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C53H80O2
#30: Chemical
ChemComp-SQD / 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL / SULFOQUINOVOSYLDIACYLGLYCEROL


Mass: 795.116 Da / Num. of mol.: 14 / Source method: obtained synthetically / Formula: C41H78O12S
#32: Chemical ChemComp-BCT / BICARBONATE ION


Mass: 61.017 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: CHO3
#33: Chemical
ChemComp-LHG / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE


Mass: 722.970 Da / Num. of mol.: 14 / Source method: obtained synthetically / Formula: C38H75O10P / Comment: phospholipid*YM
#35: Chemical
ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C34H32FeN4O4
#36: Chemical ChemComp-RRX / (3R)-beta,beta-caroten-3-ol / beta-Cryptoxanthin


Mass: 552.872 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C40H56O
#37: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Ca
#38: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 1294 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
Has protein modificationY
Sequence detailsThe sequence for chains A and a end at ALA 344. The C-terminal end is removed by a post- ...The sequence for chains A and a end at ALA 344. The C-terminal end is removed by a post-translational process that remoes the sequence SGEQAPVALTAPAVNG

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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: photosystem II / Type: COMPLEX / Entity ID: #1-#21 / Source: NATURAL
Source (natural)Organism: Synechocystis sp. PCC 6803 (bacteria)
Buffer solutionpH: 6.8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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 FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 38 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 1.97 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 518876 / Symmetry type: POINT

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