1HD9

The Bowman-Birk Inhibitor Reactive Site Loop Sequence Represents an Independent Structural Beta-Hairpin Motif


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 30 
  • Selection Criteria: LOWEST ENERGY 

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This is version 1.2 of the entry. See complete history


Literature

The Bowman-Birk Inhibitor Reactive Site Loop Sequence Represents an Independent Structural Beta-Hairpin Motif

Brauer, A.B.E.Kelly, G.Mcbride, J.D.Cooke, R.M.Matthews, S.J.Leatherbarrow, R.J.

(2001) J Mol Biol 306: 799

  • DOI: 10.1006/jmbi.2000.4410
  • Primary Citation of Related Structures:  
    1HD9

  • PubMed Abstract: 
  • We have determined the NMR structure in aqueous solution of a disulphide-cyclised 11-residue peptide that forms a stable beta-hairpin, incorporating a type VIb beta-turn. The structure is found to be extremely well ordered for a short peptide, with the 30 lowest energy simulated annealing structures having an average pairwise r ...

    We have determined the NMR structure in aqueous solution of a disulphide-cyclised 11-residue peptide that forms a stable beta-hairpin, incorporating a type VIb beta-turn. The structure is found to be extremely well ordered for a short peptide, with the 30 lowest energy simulated annealing structures having an average pairwise r.m.s. deviation of only 0.36 A over the backbone. All but three side-chains adopt distinct conformations, allowing a detailed analysis of their involvement in cross-strand interactions. The peptide sequence analysed originates from a previously reported study, which identified potent inhibitors of human leukocyte elastase from screening a combinatorial peptide library based on the short protein beta-sheet segment that forms the reactive site loop of Bowman-Birk inhibitors. A detailed comparison of the peptide's solution structure with the corresponding region in the whole protein structure reveals a very good correspondence not only for the backbone (r.m.s. deviation approximately 0.7 A) but also for the side-chains. This isolated beta-hairpin retains the biologically active "canonical conformation" typical of small serine proteinase inhibitor proteins, which explains why it retains inhibitory activity. Since the structural integrity is sequence-inherent and does not depend upon the presence of the remaining protein, this beta-hairpin represents an independent structural motif and so provides a useful model of this type of protein architecture and its relation to biological function. The relationship between the conformation of this beta-hairpin and its biological activity is discussed.


    Related Citations: 
    • Selection of Human Elastase Inhibitors from a Conformationally-Constrained Combinatorial Peptide Library
      Mcbride, J.D., Freeman, H.N.M., Leatherbarrow, R.J.
      (1999) Eur J Biochem 266: 403

    Organizational Affiliation

    Department of Chemistry, Imperial College of Science Technology and Medicine, South Kensington, London, UK.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BOWMAN-BIRK INHIBITOR DERIVED PEPTIDEA11synthetic constructMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NLE
Query on NLE
A L-PEPTIDE LINKINGC6 H13 N O2LEU
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 30 
  • Selection Criteria: LOWEST ENERGY 
  • OLDERADO: 1HD9 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-03-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.2: 2019-07-24
    Changes: Data collection, Derived calculations, Source and taxonomy