2NAV

NMR solution structure of Ex-4[1-16]/pl14a


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • 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

Truncated Glucagon-like Peptide-1 and Exendin-4 alpha-Conotoxin pl14a Peptide Chimeras Maintain Potency and alpha-Helicity and Reveal Interactions Vital for cAMP Signaling in Vitro.

Swedberg, J.E.Schroeder, C.I.Mitchell, J.M.Fairlie, D.P.Edmonds, D.J.Griffith, D.A.Ruggeri, R.B.Derksen, D.R.Loria, P.M.Price, D.A.Liras, S.Craik, D.J.

(2016) J Biol Chem 291: 15778-15787

  • DOI: 10.1074/jbc.M116.724542
  • Primary Citation of Related Structures:  
    2NAW, 2NAV

  • PubMed Abstract: 
  • Glucagon-like peptide-1 (GLP-1) signaling through the glucagon-like peptide 1 receptor (GLP-1R) is a key regulator of normal glucose metabolism, and exogenous GLP-1R agonist therapy is a promising avenue for the treatment of type 2 diabetes mellitus. To date, the development of therapeutic GLP-1R agonists has focused on producing drugs with an extended serum half-life ...

    Glucagon-like peptide-1 (GLP-1) signaling through the glucagon-like peptide 1 receptor (GLP-1R) is a key regulator of normal glucose metabolism, and exogenous GLP-1R agonist therapy is a promising avenue for the treatment of type 2 diabetes mellitus. To date, the development of therapeutic GLP-1R agonists has focused on producing drugs with an extended serum half-life. This has been achieved by engineering synthetic analogs of GLP-1 or the more stable exogenous GLP-1R agonist exendin-4 (Ex-4). These synthetic peptide hormones share the overall structure of GLP-1 and Ex-4, with a C-terminal helical segment and a flexible N-terminal tail. Although numerous studies have investigated the molecular determinants underpinning GLP-1 and Ex-4 binding and signaling through the GLP-1R, these have primarily focused on the length and composition of the N-terminal tail or on how to modulate the helicity of the full-length peptides. Here, we investigate the effect of C-terminal truncation in GLP-1 and Ex-4 on the cAMP pathway. To ensure helical C-terminal regions in the truncated peptides, we produced a series of chimeric peptides combining the N-terminal portion of GLP-1 or Ex-4 and the C-terminal segment of the helix-promoting peptide α-conotoxin pl14a. The helicity and structures of the chimeric peptides were confirmed using circular dichroism and NMR, respectively. We found no direct correlation between the fractional helicity and potency in signaling via the cAMP pathway. Rather, the most important feature for efficient receptor binding and signaling was the C-terminal helical segment (residues 22-27) directing the binding of Phe(22) into a hydrophobic pocket on the GLP-1R.


    Organizational Affiliation

    From the Institute for Molecular Bioscience, The University of Queensland, Brisbane, 4072 Queensland, Australia, d.craik@imb.uq.edu.au.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Exendin-4, Alpha/kappa-conotoxin pl14a chimeraA29Heloderma suspectumConus planorbis
This entity is chimeric
Mutation(s): 1 
UniProt
Find proteins for P26349 (Heloderma suspectum)
Explore P26349 
Go to UniProtKB:  P26349
Find proteins for Q0N4U8 (Conus planorbis)
Explore Q0N4U8 
Go to UniProtKB:  Q0N4U8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2NAV Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-05-04
    Type: Initial release
  • Version 1.1: 2016-06-08
    Changes: Database references
  • Version 1.2: 2016-08-17
    Changes: Database references