7MH8

Crystal structure of R. sphaeroides Photosynthetic Reaction Center variant; Y(M210)3-methyltyrosine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 

Starting Model: experimental
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Literature

Photosynthetic reaction center variants made via genetic code expansion show Tyr at M210 tunes the initial electron transfer mechanism.

Weaver, J.B.Lin, C.Y.Faries, K.M.Mathews, I.I.Russi, S.Holten, D.Kirmaier, C.Boxer, S.G.

(2021) Proc Natl Acad Sci U S A 118

  • DOI: https://doi.org/10.1073/pnas.2116439118
  • Primary Citation of Related Structures:  
    7MH3, 7MH4, 7MH5, 7MH8, 7MH9

  • PubMed Abstract: 

    Photosynthetic reaction centers (RCs) from Rhodobacter sphaeroides were engineered to vary the electronic properties of a key tyrosine (M210) close to an essential electron transfer component via its replacement with site-specific, genetically encoded noncanonical amino acid tyrosine analogs. High fidelity of noncanonical amino acid incorporation was verified with mass spectrometry and X-ray crystallography and demonstrated that RC variants exhibit no significant structural alterations relative to wild type (WT). Ultrafast transient absorption spectroscopy indicates the excited primary electron donor, P*, decays via a ∼4-ps and a ∼20-ps population to produce the charge-separated state P + H A - in all variants. Global analysis indicates that in the ∼4-ps population, P + H A - forms through a two-step process, P*→ P + B A - → P + H A - , while in the ∼20-ps population, it forms via a one-step P* → P + H A - superexchange mechanism. The percentage of the P* population that decays via the superexchange route varies from ∼25 to ∼45% among variants, while in WT, this percentage is ∼15%. Increases in the P* population that decays via superexchange correlate with increases in the free energy of the P + B A - intermediate caused by a given M210 tyrosine analog. This was experimentally estimated through resonance Stark spectroscopy, redox titrations, and near-infrared absorption measurements. As the most energetically perturbative variant, 3-nitrotyrosine at M210 creates an ∼110-meV increase in the free energy of P + B A - along with a dramatic diminution of the 1,030-nm transient absorption band indicative of P + B A - formation. Collectively, this work indicates the tyrosine at M210 tunes the mechanism of primary electron transfer in the RC.


  • Organizational Affiliation

    Department of Chemistry, Stanford University, Stanford, CA 94305.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Reaction center protein H chainA [auth H]266Cereibacter sphaeroidesMutation(s): 0 
Gene Names: puhA
Membrane Entity: Yes 
UniProt
Find proteins for Q3J170 (Cereibacter sphaeroides (strain ATCC 17023 / DSM 158 / JCM 6121 / CCUG 31486 / LMG 2827 / NBRC 12203 / NCIMB 8253 / ATH 2.4.1.))
Explore Q3J170 
Go to UniProtKB:  Q3J170
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ3J170
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Reaction center protein L chainB [auth L]282Cereibacter sphaeroidesMutation(s): 0 
Gene Names: pufL
Membrane Entity: Yes 
UniProt
Find proteins for Q3J1A5 (Cereibacter sphaeroides (strain ATCC 17023 / DSM 158 / JCM 6121 / CCUG 31486 / LMG 2827 / NBRC 12203 / NCIMB 8253 / ATH 2.4.1.))
Explore Q3J1A5 
Go to UniProtKB:  Q3J1A5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ3J1A5
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Reaction center protein M chainC [auth M]308Cereibacter sphaeroidesMutation(s): 0 
Gene Names: pufM
Membrane Entity: Yes 
UniProt
Find proteins for Q3J1A6 (Cereibacter sphaeroides (strain ATCC 17023 / DSM 158 / JCM 6121 / CCUG 31486 / LMG 2827 / NBRC 12203 / NCIMB 8253 / ATH 2.4.1.))
Explore Q3J1A6 
Go to UniProtKB:  Q3J1A6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ3J1A6
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CDL
Query on CDL

Download Ideal Coordinates CCD File 
S [auth M]CARDIOLIPIN
C81 H156 O17 P2
XVTUQDWPJJBEHJ-KZCWQMDCSA-L
BCL (Subject of Investigation/LOI)
Query on BCL

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E [auth L],
H [auth L],
I [auth L],
J [auth M]
BACTERIOCHLOROPHYLL A
C55 H74 Mg N4 O6
DSJXIQQMORJERS-AGGZHOMASA-M
BPH (Subject of Investigation/LOI)
Query on BPH

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F [auth L],
P [auth M]
BACTERIOPHEOPHYTIN A
C55 H76 N4 O6
KWOZSBGNAHVCKG-SZQBJALDSA-N
U10 (Subject of Investigation/LOI)
Query on U10

Download Ideal Coordinates CCD File 
G [auth L],
Q [auth M]
UBIQUINONE-10
C59 H90 O4
ACTIUHUUMQJHFO-UPTCCGCDSA-N
SPO
Query on SPO

Download Ideal Coordinates CCD File 
R [auth M]SPHEROIDENE
C41 H60 O
FJOCMTHZSURUFA-KXCOHNEYSA-N
LDA
Query on LDA

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D [auth H],
K [auth M],
L [auth M],
M,
N [auth M]
LAURYL DIMETHYLAMINE-N-OXIDE
C14 H31 N O
SYELZBGXAIXKHU-UHFFFAOYSA-N
FE
Query on FE

Download Ideal Coordinates CCD File 
O [auth M]FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
ZDJ
Query on ZDJ
C [auth M]L-PEPTIDE LINKINGC10 H13 N O3TYR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 140.96α = 90
b = 140.96β = 90
c = 187.01γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United States1915727

Revision History  (Full details and data files)

  • Version 1.0: 2021-12-29
    Type: Initial release
  • Version 1.1: 2024-04-03
    Changes: Data collection, Refinement description