1CIS

CONTEXT DEPENDENCE OF PROTEIN SECONDARY STRUCTURE FORMATION. THE THREE-DIMENSIONAL STRUCTURE AND STABILITY OF A HYBRID BETWEEN CHYMOTRYPSIN INHIBITOR 2 AND HELIX E FROM SUBTILISIN CARLSBERG


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 15 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Context dependence of protein secondary structure formation: the three-dimensional structure and stability of a hybrid between chymotrypsin inhibitor 2 and helix E from subtilisin Carlsberg.

Osmark, P.Sorensen, P.Poulsen, F.M.

(1993) Biochemistry 32: 11007-11014


  • PubMed Abstract: 
  • The loop region of chymotrypsin inhibitor 2 from barley has been employed as a scaffold for testing the intrinsic propensity of a peptide fragment to form a secondary structure. The helix formation of the nine amino acid residue segment Lys-Gln-Ala-V ...

    The loop region of chymotrypsin inhibitor 2 from barley has been employed as a scaffold for testing the intrinsic propensity of a peptide fragment to form a secondary structure. The helix formation of the nine amino acid residue segment Lys-Gln-Ala-Val-Asp-Asn-Ala-Tyr-Ala of helix E from subtilisin Carlsberg has been studied by the construction of a hybrid consisting of chymotrypsin inhibitor 2 (CI2) where part of the active loop has been replaced by the nonapeptide. An expression system for a truncated form of CI2 where the 19 structureless residues of the N-terminus have been removed and Leu20 replaced by methionyl was constructed from the entire 83-residue wild-type CI2 gene by polymerase chain reaction methodology. The gene encoding the hybrid was constructed from the truncated inhibitor gene. The stability of the truncated inhibitor and of the hybrid toward guanidinium chloride denaturation was examined. From these measurements, the energy of unfolding in pure water was extrapolated to 30.5 +/- 1.0 kJ/mol for the truncated inhibitor and 10.9 +/- 0.3 kJ/mol for the hybrid. These energies show that the stability of CI2 is unaffected by the N-terminal truncation but severely decreased by the loop mutations. The three-dimensional structure of the hybrid protein has been determined in solution by nuclear magnetic resonance spectroscopy using 893 distance restraints and 84 torsional angle restraints. The average root-mean-square deviation (rmsd) of 15 structures compared to their geometrical average was 0.8 +/- 0.2 A for heavy backbone atoms and 1.3 +/- 0.2 A for all heavy atoms.(ABSTRACT TRUNCATED AT 250 WORDS)


    Related Citations: 
    • The High-Resolution X-Ray Crystal Structure of the Complex Formed between Subtilisin Carlsberg and Eglin C, an Elastase Inhibitor from the Leech Hirudo Medicinalis: Structural Analysis, Subtilisin Structure and Interface Geometry
      Bode, W.,Papamokos, E.,Musil, D.
      (1987) Eur.J.Biochem. 166: 673
    • Refinement of the Three-Dimensional Solution Structure of Barley Serine Proteinase Inhibitor 2 and Comparison with the Structures in Crystals
      Ludvigsen, S.,Shen, H.,Kjaer, M.,Madsen, J.C.,Poulsen, F.M.
      (1991) J.Mol.Biol. 222: 621


    Organizational Affiliation

    Carlsberg Laboratorium, Kemisk Afdeling, Copenhagen, Denmark.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HYBRID PROTEIN FORMED FROM CHYMOTRYPSIN INHIBITOR-2
A
66Hordeum vulgareN/A
Find proteins for P01053 (Hordeum vulgare)
Go to UniProtKB:  P01053
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 15 
  • Olderado: 1CIS Olderado
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1993-10-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other