2BEY

Solution Structure of a Novel C2 Symmetrical Bifunctional Bicyclic Inhibitor Based on SFTI-1


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 

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Literature

Solution Structure of a Novel C2-Symmetrical Bifunctional Bicyclic Inhibitor Based on Sfti-1

Jaulent, A.M.Brauer, A.B.E.Matthews, S.J.Leatherbarrow, R.J.

(2005) J.Biomol.NMR 33: 57

  • DOI: 10.1007/s10858-005-1210-9

  • PubMed Abstract: 
  • A novel bifunctional bicyclic inhibitor has been created that combines features both from the Bowman-Birk inhibitor (BBI) proteins, which have two distinct inhibitory sites, and from sunflower trypsin inhibitor-1 (SFTI-1), which has a compact bicycli ...

    A novel bifunctional bicyclic inhibitor has been created that combines features both from the Bowman-Birk inhibitor (BBI) proteins, which have two distinct inhibitory sites, and from sunflower trypsin inhibitor-1 (SFTI-1), which has a compact bicyclic structure. The inhibitor was designed by fusing together a pair of reactive loops based on a sequence derived from SFTI-1 to create a backbone-cyclized disulfide-bridged 16-mer peptide. This peptide has two symmetrically spaced trypsin binding sites. Its synthesis and biological activity have been reported in a previous communication [Jaulent and Leatherbarrow, 2004, PEDS 17, 681]. In the present study we have examined the three-dimensional structure of the molecule. We find that the new inhibitor, which has a symmetrical 8-mer half-cystine CTKSIPP'I' motif repeated through a C2 symmetry axis also shows a complete symmetry in its three-dimensional structure. Each of the two loops adopts the expected canonical conformation common to all BBIs as well as SFTI-1. We also find that the inhibitor displays a strong and unique structural identity, with a notable lack of minor conformational isomers that characterise most reactive site loop mimics examined to date as well as SFTI-1. This suggests that the presence of the additional cyclic loop acts to restrict conformational mobility and that the deliberate introduction of cyclic symmetry may offer a general route to locking the conformation of beta-hairpin structures.


    Related Citations: 
    • Design, Synthesis and Analysis of Novel Bicyclic and Bifunctional Protease Inhibitors
      Jaulent, A.M.,Leatherbarrow, R.J.
      (2004) Protein Eng.Des.Sel. 17: 681
    • High-Resolution Structure of a Potent, Cyclic Proteinase Inhibitor from Sunflower Seeds
      Luckett, S.,Garcia, R.S.,Barker, J.J.,Konarev, A.V.,Shewry, P.R.,Clarke, A.R.,Brady, R.L.
      (1999) J.Mol.Biol. 290: 525


    Organizational Affiliation

    Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BIKK
A
16N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 
  • Olderado: 2BEY Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-17
    Type: Initial release
  • Version 1.1: 2016-12-21
    Type: Derived calculations, Other, Source and taxonomy, Version format compliance