Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 1.20 kDa 
• Atom Count: 82 
• Modelled Residue Count: 11 
• Deposited Residue Count: 11 
• Unique protein chains: 1

1HD9

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

• PDB DOI: 10.2210/pdb1HD9/pdb

• Classification: HYDROLASE INHIBITOR
• Organism(s): synthetic construct
• Mutation(s): No 


• Deposited: 2000-11-13 Released: 2001-03-29 
• Deposition Author(s): Brauer, A.B.E., Kelly, G., McBride, J.D., Cooke, R.M., Matthews, S.J., Leatherbarrow, R.J.

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Experimental Data Snapshot

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

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

• PubMed: 11243789 
• 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.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.

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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

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BOWMAN-BIRK INHIBITOR DERIVED PEPTIDE	A	11	synthetic construct	Mutation(s): 0

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
NLE	A	L-PEPTIDE LINKING	C6 H13 N O2		LEU

Experimental Data & Validation

Experimental Data

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-11-13 
• Released Date: 2001-03-29 
Deposition Author(s): Brauer, A.B.E., Kelly, G., McBride, J.D., Cooke, R.M., Matthews, S.J., Leatherbarrow, R.J.

Revision History  

• 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