5VKX

Coordination Chemistry within a Protein Host: Regulation of the Secondary Coordination Sphere

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.37 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.165 

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Literature

Coordination chemistry within a protein host: regulation of the secondary coordination sphere.

Mann, S.I., Heinisch, T., Ward, T.R., Borovik, A.S.

(2018) Chem Commun (Camb) 54: 4413-4416

  • DOI: 10.1039/c8cc01931b
  • Primary Citation of Related Structures:  
    5VKX, 5VL5, 5VL8

  • PubMed Abstract: 

    • Secondary coordination spheres of metal complexes are instrumental in controlling properties that are linked to function. To study these effects in aqueous solutions artificial Cu proteins have been developed using biotin-streptavidin (Sav) technology and their binding of external azide ions investigated ...

    Secondary coordination spheres of metal complexes are instrumental in controlling properties that are linked to function. To study these effects in aqueous solutions artificial Cu proteins have been developed using biotin-streptavidin (Sav) technology and their binding of external azide ions investigated. Parallel binding studies were done in crystallo on single crystals of the artificial Cu proteins. Spectroscopic changes in solution are consistent with azide binding to the Cu centers. Structural studies corroborate that a Cu-N3 unit is present in each Sav subunit and reveal the composition of hydrogen bonding (H-bonding) networks that include the coordinated azido ligand. The networks involve amino acid residues and water molecules within the secondary coordination sphere. Mutation of these residues to ones that cannot form H-bonds caused a measurble change in the equilibrium binding constants that were measured in solution. These findings further demonstrate the utility of biotin-Sav technology to prepare water-stable inorganic complexes whose structures can be controlled within both primary and secondary coordination spheres.

    Organizational Affiliation: 

    Department of Chemistry, 1102 Natural Science II, University of California, Irvine, CA 92697, USA. aborovik@uci.edu.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
StreptavidinA159Streptomyces avidiniiMutation(s): 0 
UniProt
Find proteins for P22629 (Streptomyces avidinii)
Explore P22629 
Go to UniProtKB:  P22629
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22629
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
S18
Query on S18
Download Ideal Coordinates CCD File 
B [auth A][N-(3-{bis[2-(pyridin-2-yl-kappaN)ethyl]amino-kappaN}ethyl)-5-(2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide](azido)copper
C26 H37 Cu N9 O2 S
KONQVOWZMULWRO-HRKQCRCBSA-N		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
D [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
CU
Query on CU
Download Ideal Coordinates CCD File 
C [auth A]COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.37 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.165 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.875α = 90
b = 57.875β = 90
c = 184.424γ = 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 StatesGM50781-21S1

Revision History  (Full details and data files)

  • Version 1.0: 2018-04-18
    Type: Initial release
  • Version 1.1: 2018-04-25
    Changes: Data collection, Database references
  • Version 1.2: 2018-05-09
    Changes: Data collection, Database references
  • Version 1.3: 2020-01-01
    Changes: Author supporting evidence, Derived calculations