2LXY

NMR structure of 2-MERCAPTOPHENOL-ALPHA3C


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 1000 
  • Conformers Submitted: 32 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Reversible phenol oxidation and reduction in the structurally well-defined 2-Mercaptophenol-alpha(3)C protein.

Tommos, C.Valentine, K.G.Martinez-Rivera, M.C.Liang, L.Moorman, V.R.

(2013) Biochemistry 52: 1409-1418

  • DOI: 10.1021/bi301613p
  • Primary Citation of Related Structures:  
    2LXY

  • PubMed Abstract: 
  • 2-Mercaptophenol-α₃C serves as a biomimetic model for enzymes that use tyrosine residues in redox catalysis and multistep electron transfer. This model protein was tailored for electrochemical studies of phenol oxidation and reduction with specific emphasis on the redox-driven protonic reactions occurring at the phenol oxygen ...

    2-Mercaptophenol-α₃C serves as a biomimetic model for enzymes that use tyrosine residues in redox catalysis and multistep electron transfer. This model protein was tailored for electrochemical studies of phenol oxidation and reduction with specific emphasis on the redox-driven protonic reactions occurring at the phenol oxygen. This protein contains a covalently modified 2-mercaptophenol-cysteine residue. The radical site and the phenol compound were specifically chosen to bury the phenol OH group inside the protein. A solution nuclear magnetic resonance structural analysis (i) demonstrates that the synthetic 2-mercaptophenol-α₃C model protein behaves structurally as a natural protein, (ii) confirms the design of the radical site, (iii) reveals that the ligated phenol forms an interhelical hydrogen bond to glutamate 13 (phenol oxygen-carboxyl oxygen distance of 3.2 ± 0.5 Å), and (iv) suggests a proton-transfer pathway from the buried phenol OH (average solvent accessible surface area of 3 ± 5%) via glutamate 13 (average solvent accessible surface area of the carboxyl oxygens of 37 ± 18%) to the bulk solvent. A square-wave voltammetry analysis of 2-mercaptophenol-α₃C further demonstrates that (v) the phenol oxidation-reduction cycle is reversible, (vi) formal phenol reduction potentials can be obtained, and (vii) the phenol-O(•) state is long-lived with an estimated lifetime of ≥180 millisecond. These properties make 2-mercaptophenol-α₃C a unique system for characterizing phenol-based proton-coupled electron transfer in a low-dielectric and structured protein environment.


    Related Citations: 
    • Reversible voltammograms and a Pourbaix diagram for a protein tyrosine radical.
      Berry, B.W., Martinez-Rivera, M.C., Tommos, C.
      (2012) Proc Natl Acad Sci U S A 109: 9739
    • Electrochemical and structural properties of a protein system designed to generate tyrosine Pourbaix diagrams.
      Martinez-Rivera, M.C., Berry, B.W., Valentine, K.G., Westerlund, K., Hay, S., Tommos, C.
      (2011) J Am Chem Soc 133: 17786
    • Moving a phenol hydroxyl group from the surface to the interior of a protein: effects on the phenol potential and pK(A).
      Hay, S., Westerlund, K., Tommos, C.
      (2005) Biochemistry 44: 11891
    • Structure of a de novo designed protein model of radical enzymes.
      Dai, Q.H., Tommos, C., Fuentes, E.J., Blomberg, M.R., Dutton, P.L., Wand, A.J.
      (2002) J Am Chem Soc 124: 10952
    • De novo proteins as models of radical enzymes.
      Tommos, C., Skalicky, J.J., Pilloud, D.L., Wand, A.J., Dutton, P.L.
      (1999) Biochemistry 38: 9495
    • De novo proteins as models of radical enzymes
      Tommos, C., Skalicky, J.J., Pilloud, D.L., Wand, A., Dutton, P.
      (1999) Biochemistry 38: 9495

    Organizational Affiliation

    Graduate Group in Biochemistry and Molecular Biophysics and Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6059, United States. tommos@mail.med.upenn.edu



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
2-mercaptophenol-alpha3CA67N/AMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HTS
Query on HTS

Download Ideal Coordinates CCD File 
B [auth A]2-MERCAPTOPHENOL
C6 H6 O S
VMKYTRPNOVFCGZ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 1000 
  • Conformers Submitted: 32 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2LXY Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-27
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references