2MLI

NMR structure of B25-(alpha, beta)-dehydro-phenylalanine insulin


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with acceptable covalent geometry 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Protective hinge in insulin opens to enable its receptor engagement.

Menting, J.G.Yang, Y.Chan, S.J.Phillips, N.B.Smith, B.J.Whittaker, J.Wickramasinghe, N.P.Whittaker, L.J.Pandyarajan, V.Wan, Z.L.Yadav, S.P.Carroll, J.M.Strokes, N.Roberts, C.T.Ismail-Beigi, F.Milewski, W.Steiner, D.F.Chauhan, V.S.Ward, C.W.Weiss, M.A.Lawrence, M.C.

(2014) Proc Natl Acad Sci U S A 111: E3395-E3404

  • DOI: 10.1073/pnas.1412897111
  • Primary Citation of Related Structures:  
    4NIB, 4OGA, 2MLI, 2MPI

  • PubMed Abstract: 
  • Insulin provides a classical model of a globular protein, yet how the hormone changes conformation to engage its receptor has long been enigmatic. Interest has focused on the C-terminal B-chain segment, critical for protective self-assembly in β cell ...

    Insulin provides a classical model of a globular protein, yet how the hormone changes conformation to engage its receptor has long been enigmatic. Interest has focused on the C-terminal B-chain segment, critical for protective self-assembly in β cells and receptor binding at target tissues. Insight may be obtained from truncated "microreceptors" that reconstitute the primary hormone-binding site (α-subunit domains L1 and αCT). We demonstrate that, on microreceptor binding, this segment undergoes concerted hinge-like rotation at its B20-B23 β-turn, coupling reorientation of Phe(B24) to a 60° rotation of the B25-B28 β-strand away from the hormone core to lie antiparallel to the receptor's L1-β2 sheet. Opening of this hinge enables conserved nonpolar side chains (Ile(A2), Val(A3), Val(B12), Phe(B24), and Phe(B25)) to engage the receptor. Restraining the hinge by nonstandard mutagenesis preserves native folding but blocks receptor binding, whereas its engineered opening maintains activity at the price of protein instability and nonnative aggregation. Our findings rationalize properties of clinical mutations in the insulin family and provide a previously unidentified foundation for designing therapeutic analogs. We envisage that a switch between free and receptor-bound conformations of insulin evolved as a solution to conflicting structural determinants of biosynthesis and function.


    Organizational Affiliation

    Structural Biology Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia;Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia dfsteine@midway.uchicago.edu michael.weiss@case.edu lawrence@wehi.edu.au.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
InsulinA21Homo sapiensMutation(s): 0 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Explore P01308 
Go to UniProtKB:  P01308
NIH Common Fund Data Resources
PHAROS  P01308
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
InsulinB30Homo sapiensMutation(s): 0 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Explore P01308 
Go to UniProtKB:  P01308
NIH Common Fund Data Resources
PHAROS  P01308
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
23F
Query on 23F
BPEPTIDE LINKINGC9 H9 N O2PHE
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with acceptable covalent geometry 
  • OLDERADO: 2MLI Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2014-02-27 
  • Released Date: 2014-08-20 
  • Deposition Author(s): Yang, Y., Weiss, M.

Revision History 

  • Version 1.0: 2014-08-20
    Type: Initial release
  • Version 1.1: 2014-09-03
    Changes: Database references