4ZV2

An ancestral arginine-binding protein bound to glutamine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.43 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.183 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Ancestral Protein Reconstruction Yields Insights into Adaptive Evolution of Binding Specificity in Solute-Binding Proteins.

Clifton, B.E.Jackson, C.J.

(2016) Cell Chem Biol 23: 236-245

  • DOI: https://doi.org/10.1016/j.chembiol.2015.12.010
  • Primary Citation of Related Structures:  
    4ZV1, 4ZV2

  • PubMed Abstract: 

    The promiscuous functions of proteins are an important reservoir of functional novelty in protein evolution, but the molecular basis for binding promiscuity remains elusive. We used ancestral protein reconstruction to experimentally characterize evolutionary intermediates in the functional expansion of the polar amino acid-binding protein family, which has evolved to bind a variety of amino acids with high affinity and specificity. High-resolution crystal structures of an ancestral arginine-binding protein in complex with l-arginine and l-glutamine show that the promiscuous binding of l-glutamine is enabled by multi-scale conformational plasticity, water-mediated interactions, and selection of an alternative conformational substate productive for l-glutamine binding. Evolution of specialized glutamine-binding proteins from this ancestral protein was achieved by displacement of water molecules from the protein-ligand interface, reducing the entropic penalty associated with the promiscuous interaction. These results provide a structural and thermodynamic basis for the co-option of a promiscuous interaction in the evolution of binding specificity.


  • Organizational Affiliation

    Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AncQR233synthetic constructMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GLN
Query on GLN

Download Ideal Coordinates CCD File 
B [auth A]GLUTAMINE
C5 H10 N2 O3
ZDXPYRJPNDTMRX-VKHMYHEASA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.43 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.2α = 90
b = 61.3β = 90
c = 104.57γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Aimlessdata scaling
MOSFLMdata reduction
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-03
    Type: Initial release
  • Version 1.1: 2016-03-02
    Changes: Database references
  • Version 1.2: 2016-03-30
    Changes: Database references
  • Version 1.3: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description