5EYL

TUBULIN-BINDING DARPIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.41 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Destabilizing an interacting motif strengthens the association of a designed ankyrin repeat protein with tubulin.

Ahmad, S.Pecqueur, L.Dreier, B.Hamdane, D.Aumont-Nicaise, M.Pluckthun, A.Knossow, M.Gigant, B.

(2016) Sci Rep 6: 28922-28922

  • DOI: 10.1038/srep28922
  • Primary Citation of Related Structures:  
    5EYL, 5EYP

  • PubMed Abstract: 
  • Affinity maturation by random mutagenesis and selection is an established technique to make binding molecules more suitable for applications in biomedical research, diagnostics and therapy. Here we identified an unexpected novel mechanism of affinity ...

    Affinity maturation by random mutagenesis and selection is an established technique to make binding molecules more suitable for applications in biomedical research, diagnostics and therapy. Here we identified an unexpected novel mechanism of affinity increase upon in vitro evolution of a tubulin-specific designed ankyrin repeat protein (DARPin). Structural analysis indicated that in the progenitor DARPin the C-terminal capping repeat (C-cap) undergoes a 25° rotation to avoid a clash with tubulin upon binding. Additionally, the C-cap appears to be involved in electrostatic repulsion with tubulin. Biochemical and structural characterizations demonstrated that the evolved mutants achieved a gain in affinity through destabilization of the C-cap, which relieves the need of a DARPin conformational change upon tubulin binding and removes unfavorable interactions in the complex. Therefore, this specific case of an order-to-disorder transition led to a 100-fold tighter complex with a subnanomolar equilibrium dissociation constant, remarkably associated with a 30% decrease of the binding surface.


    Organizational Affiliation

    Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, 91198, Gif-sur-Yvette cedex, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DESIGNED ANKYRIN REPEAT PROTEIN (DARPIN)A, B169synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A, B
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.41 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.311α = 90
b = 105.311β = 90
c = 192.962γ = 120
Software Package:
Software NamePurpose
BUSTERrefinement
Aimlessdata scaling
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
French National Research AgencyFranceANR-12-BSV8-0002-01

Revision History 

  • Version 1.0: 2016-07-20
    Type: Initial release
  • Version 1.1: 2017-08-16
    Changes: Data collection
  • Version 1.2: 2017-09-06
    Changes: Author supporting evidence