1KMF

NMR STRUCTURE OF HUMAN INSULIN MUTANT ILE-A2-ALLO-ILE, HIS-B10-ASP, PRO-B28-LYS, LYS-B29-PRO, 15 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Chiral mutagenesis of insulin's hidden receptor-binding surface: structure of an allo-isoleucine(A2) analogue.

Xu, B.Hua, Q.X.Nakagawa, S.H.Jia, W.Chu, Y.C.Katsoyannis, P.G.Weiss, M.A.

(2002) J.Mol.Biol. 316: 435-441

  • DOI: 10.1006/jmbi.2001.5377

  • PubMed Abstract: 
  • The hydrophobic core of vertebrate insulins contains an invariant isoleucine residue at position A2. Lack of variation may reflect this side-chain's dual contribution to structure and function: Ile(A2) is proposed both to stabilize the A1-A8 alpha-he ...

    The hydrophobic core of vertebrate insulins contains an invariant isoleucine residue at position A2. Lack of variation may reflect this side-chain's dual contribution to structure and function: Ile(A2) is proposed both to stabilize the A1-A8 alpha-helix and to contribute to a "hidden" functional surface exposed on receptor binding. Substitution of Ile(A2) by alanine results in segmental unfolding of the A1-A8 alpha-helix, lower thermodynamic stability and impaired receptor binding. Such a spectrum of perturbations, although of biophysical interest, confounds interpretation of structure-activity relationships. To investigate the specific contribution of Ile(A2) to insulin's functional surface, we have employed non-standard mutagenesis: inversion of side-chain chirality in engineered monomer allo-Ile(A2)-DKP-insulin. Although the analogue retains native structure and stability, its affinity for the insulin receptor is impaired by 50-fold. Thus, whereas insulin's core readily accommodates allo-isoleucine at A2, its activity is exquisitely sensitive to chiral inversion. We propose that the Ile(A2) side-chain inserts within a chiral pocket of the receptor as part of insulin's hidden functional surface.


    Related Citations: 
    • A Cavity-Forming Mutation in Insulin Induces Segmental Unfolding of a Surrounding alpha-Helix
      Xu, B.,Hua, Q.X.,Nakagawa, S.H.,Jia, W.,Chu, Y.C.,Katsoyannis, P.G.,Weiss, M.A.
      (2002) Protein Sci. 11: 104
    • Importance of Aliphatic Side-Chain Structure at Positions 2 and 3 of the Insulin A Chain in Insulin-Receptor Interactions
      Nakagawa, S.H.,Tager, H.S.
      (1992) Biochemistry 31: 3204
    • Critical Role of the A2 Amino Acid Residue in the Biological Activity of Insulin: [2-Glycine-A]- and [2-Alanine-A]insulins
      Kitagawa, K.,Ogawa, H.,Burke, G.T.,Chanley, J.D.,Katsoyannis, P.G.
      (1984) Biochemistry 23: 1405
    • Mapping the Functional Surface of Insulin by Design: Structure and Function of a Novel A-Chain Analogue
      Hua, Q.X.,Hu, S.Q.,Frank, B.H.,Jia, W.,Chu, Y.C.,Wang, S.H.,Burke, G.T.,Katsoyannis, P.G.,Weiss, M.A.
      (1996) J.Mol.Biol. 264: 390


    Organizational Affiliation

    Department of Biochemistry, Case Western Reserve University School of Medicine, Cleveland, OH 44106-4935, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Insulin
A
21Homo sapiensMutation(s): 1 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Go to Gene View: INS
Go to UniProtKB:  P01308
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Insulin
B
30Homo sapiensMutation(s): 3 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Go to Gene View: INS
Go to UniProtKB:  P01308
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
IIL
Query on IIL
A
L-PEPTIDE LINKINGC6 H13 N O2ILE
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1KMF Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-01-09
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance