Artificial Metalloproteins Containing a Co4O4 Active Site - 2xm-S112Y-b

Experimental Data Snapshot

  • Resolution: 1.36 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history


Artificial Metalloproteins Containing Co

Olshansky, L.Huerta-Lavorie, R.Nguyen, A.I.Vallapurackal, J.Furst, A.Tilley, T.D.Borovik, A.S.

(2018) J. Am. Chem. Soc. 140: 2739-2742

  • DOI: 10.1021/jacs.7b13052
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Artificial metalloproteins (ArMs) containing Co <sub>4 </sub>O <sub>4 </sub> cubane active sites were constructed via biotin-streptavidin technology. Stabilized by hydrogen bonds (H-bonds), terminal and cofacial Co <sup>III </sup>-OH <sub>2 </sub> mo ...

    Artificial metalloproteins (ArMs) containing Co 4 O 4 cubane active sites were constructed via biotin-streptavidin technology. Stabilized by hydrogen bonds (H-bonds), terminal and cofacial Co III -OH 2 moieties are observed crystallographically in a series of immobilized cubane sites. Solution electrochemistry provided correlations of oxidation potential and pH. For variants containing Ser and Phe adjacent to the metallocofactor, 1e - /1H + chemistry predominates until pH 8, above which the oxidation becomes pH-independent. Installation of Tyr proximal to the Co 4 O 4 active site provided a single H-bond to one of a set of cofacial Co III -OH 2 groups. With this variant, multi-e - /multi-H + chemistry is observed, along with a change in mechanism at pH 9.5 that is consistent with Tyr deprotonation. With structural similarities to both the oxygen-evolving complex of photosystem II (H-bonded Tyr) and to thin film water oxidation catalysts (Co 4 O 4 core), these findings bridge synthetic and biological systems for water oxidation, highlighting the importance of secondary sphere interactions in mediating multi-e - /multi-H + reactivity.

    Organizational Affiliation

    Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States.,Department of Chemistry, University of California, Berkeley , Berkeley, California 94720, United States.,Chemical Science Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.


Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
159Streptomyces avidiniiMutation(s): 3 
Find proteins for P22629 (Streptomyces avidinii)
Go to UniProtKB:  P22629
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Query on OL3

Download SDF File 
Download CCD File 
C35 H45 Co4 N7 O13 S
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Resolution: 1.36 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.203 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 57.945α = 90.00
b = 57.945β = 90.00
c = 184.565γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM120349

Revision History 

  • Version 1.0: 2018-02-28
    Type: Initial release
  • Version 1.1: 2018-03-14
    Type: Database references
  • Version 1.2: 2019-04-17
    Type: Author supporting evidence, Data collection
  • Version 1.3: 2020-01-01
    Type: Author supporting evidence