6GWX

Stabilising and Understanding a Miniprotein by Rational Design.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 250 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Stabilizing and Understanding a Miniprotein by Rational Redesign.

Porter Goff, K.L.Nicol, D.Williams, C.Crump, M.P.Zieleniewski, F.Samphire, J.L.Baker, E.G.Woolfson, D.N.

(2019) Biochemistry 58: 3060-3064

  • DOI: https://doi.org/10.1021/acs.biochem.9b00067
  • Primary Citation of Related Structures:  
    6GWX

  • PubMed Abstract: 

    Miniproteins reduce the complexity of the protein-folding problem allowing systematic studies of contributions to protein folding and stabilization. Here, we describe the rational redesign of a miniprotein, PPα, comprising a polyproline II helix, a loop, and an α helix. The redesign provides a de novo framework for interrogating noncovalent interactions. Optimized PPα has significantly improved thermal stability with a midpoint unfolding temperature ( T M ) of 51 °C. Its nuclear magnetic resonance structure indicates a density of stabilizing noncovalent interactions that is higher than that of the parent peptide, specifically an increased number of CH-π interactions. In part, we attribute this to improved long-range electrostatic interactions between the two helical elements. We probe further sequence-stability relationships in the miniprotein through a series of rational mutations.


  • Organizational Affiliation

    BrisSynBio , University of Bristol , Life Sciences Building, Tyndall Avenue , Bristol BS8 1TQ , U.K.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Optimised PPa-TYR36Streptococcus mutansMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 250 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Engineering and Physical Sciences Research CouncilUnited KingdomEP/G036764/1

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-10
    Type: Initial release
  • Version 1.1: 2019-07-24
    Changes: Data collection, Database references
  • Version 1.2: 2023-06-14
    Changes: Database references, Other