4CPI

streptavidin A86D mutant with love-hate ligand 4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Love-Hate Ligands for High Resolution Analysis of Strain in Ultra-Stable Protein/Small Molecule Interaction.

Fairhead, M.Shen, D.Chan, L.K.M.Lowe, E.D.Donohoe, T.J.Howarth, M.

(2014) Bioorg.Med.Chem. 22: 5476

  • DOI: 10.1016/j.bmc.2014.07.029
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The pathway of ligand dissociation and how binding sites respond to force are not well understood for any macromolecule. Force effects on biological receptors have been studied through simulation or force spectroscopy, but not by high resolution stru ...

    The pathway of ligand dissociation and how binding sites respond to force are not well understood for any macromolecule. Force effects on biological receptors have been studied through simulation or force spectroscopy, but not by high resolution structural experiments. To investigate this challenge, we took advantage of the extreme stability of the streptavidin-biotin interaction, a paradigm for understanding non-covalent binding as well as a ubiquitous research tool. We synthesized a series of biotin-conjugates having an unchanged strong-binding biotin moiety, along with pincer-like arms designed to clash with the protein surface: 'Love-Hate ligands'. The Love-Hate ligands contained various 2,6-di-ortho aryl groups, installed using Suzuki coupling as the last synthetic step, making the steric repulsion highly modular. We determined binding affinity, as well as solving 1.1-1.6Å resolution crystal structures of streptavidin bound to Love-Hate ligands. Striking distortion of streptavidin's binding contacts was found for these complexes. Hydrogen bonds to biotin's ureido and thiophene rings were preserved for all the ligands, but biotin's valeryl tail was distorted from the classic conformation. Streptavidin's L3/4 loop, normally forming multiple energetically-important hydrogen bonds to biotin, was forced away by clashes with Love-Hate ligands, but Ser45 from L3/4 could adapt to hydrogen-bond to a different part of the ligand. This approach of preparing conflicted ligands represents a direct way to visualize strained biological interactions and test protein plasticity.


    Organizational Affiliation

    Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
STREPTAVIDIN
A, B, C, D
127Streptomyces avidiniiMutation(s): 1 
Find proteins for P22629 (Streptomyces avidinii)
Go to UniProtKB:  P22629
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, D
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
PEG
Query on PEG

Download SDF File 
Download CCD File 
A, D
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
LH4
Query on LH4

Download SDF File 
Download CCD File 
A, B, C, D
5-[(3aS,4S,6aR)-2-oxo-hexahydro-1H-thieno[3,4- d]imidazolidin-4-yl]-N'-{2,6-bis[4-(morpholine-4- sulfonyl)phenyl]phenyl}pentanehydrazide
C36 H44 N6 O8 S3
VJIGZSIHTAESLS-QVXXBSHFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.157 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 81.260α = 90.00
b = 81.250β = 103.84
c = 90.690γ = 90.00
Software Package:
Software NamePurpose
xia2data reduction
PHENIXrefinement
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-08-06
    Type: Initial release
  • Version 1.1: 2014-08-27
    Type: Database references
  • Version 1.2: 2014-10-01
    Type: Database references