6AUE

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.36 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.204 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

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:  
    6AUC, 6AUE, 6AUH, 6AUL, 6AUO

  • PubMed Abstract: 

    • 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 moieti ...

    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.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Streptavidin A159Streptomyces avidiniiMutation(s): 3 
Find proteins for P22629 (Streptomyces avidinii)
Explore P22629 
Go to UniProtKB:  P22629
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OL3
Query on OL3
Download Ideal Coordinates CCD File 
A
N-biotin-C-Co4(mu3-O)4(OAc)(Py)4(H2O)3-beta-alanine
C35 H45 Co4 N7 O13 S
JXTIQCHHLFQVFH-VNIQYHKJSA-K		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.36 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.204 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.945α = 90
b = 57.945β = 90
c = 184.565γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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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
    Changes: Database references
  • Version 1.2: 2019-04-17
    Changes: Author supporting evidence, Data collection
  • Version 1.3: 2020-01-01
    Changes: Author supporting evidence