6MJT

Azurin 122F/124W/126Re


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Two Tryptophans Are Better Than One in Accelerating Electron Flow through a Protein.

Takematsu, K.Williamson, H.R.Nikolovski, P.Kaiser, J.T.Sheng, Y.Pospisil, P.Towrie, M.Heyda, J.Hollas, D.Zalis, S.Gray, H.B.Vlcek, A.Winkler, J.R.

(2019) ACS Cent Sci 5: 192-200

  • DOI: 10.1021/acscentsci.8b00882
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • We have constructed and structurally characterized a Pseudomonas aeruginosa azurin mutant Re126WWCu I , where two adjacent tryptophan residues (W124 and W122, indole separation 3.6-4.1 Å) are inserted between the Cu

    We have constructed and structurally characterized a Pseudomonas aeruginosa azurin mutant Re126WWCu I , where two adjacent tryptophan residues (W124 and W122, indole separation 3.6-4.1 Å) are inserted between the Cu I center and a Re photosensitizer coordinated to the imidazole of H126 (Re I (H126)(CO) 3 (4,7-dimethyl-1,10-phenanthroline) + ). Cu I oxidation by the photoexcited Re label (*Re) 22.9 Å away proceeds with a ∼70 ns time constant, similar to that of a single-tryptophan mutant (∼40 ns) with a 19.4 Å Re-Cu distance. Time-resolved spectroscopy (luminescence, visible and IR absorption) revealed two rapid reversible electron transfer steps, W124 → *Re (400-475 ps, K 1 ≅ 3.5-4) and W122 → W124 •+ (7-9 ns, K 2 ≅ 0.55-0.75), followed by a rate-determining (70-90 ns) Cu I oxidation by W122 •+ ca. 11 Å away. The photocycle is completed by 120 μs recombination. No photochemical Cu I oxidation was observed in Re126FWCu I , whereas in Re126WFCu I , the photocycle is restricted to the ReH126W124 unit and Cu I remains isolated. QM/MM/MD simulations of Re126WWCu I indicate that indole solvation changes through the hopping process and W124 → *Re electron transfer is accompanied by water fluctuations that tighten W124 solvation. Our finding that multistep tunneling (hopping) confers a ∼9000-fold advantage over single-step tunneling in the double-tryptophan protein supports the proposal that hole-hopping through tryptophan/tyrosine chains protects enzymes from oxidative damage.


    Organizational Affiliation

    Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Azurin
A, B
128Pseudomonas aeruginosa PAO1Mutation(s): 7 
Gene Names: azuPA4922
Find proteins for P00282 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Go to UniProtKB:  P00282
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
REQ
Query on REQ

Download CCD File 
A, B
(1,10 PHENANTHROLINE)-(TRI-CARBON MONOXIDE) RHENIUM (I)
C17 H12 N2 O3 Re
SINYNGNXCUIFTB-UHFFFAOYSA-N
 Ligand Interaction
CU
Query on CU

Download CCD File 
A, B
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.222 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.91α = 90
b = 33.97β = 98.55
c = 77.26γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United StatesR01 DK019038

Revision History 

  • Version 1.0: 2019-02-20
    Type: Initial release
  • Version 1.1: 2019-12-25
    Changes: Author supporting evidence