1G26

THE SOLUTION STRUCTURE OF A WELL-FOLDED PEPTIDE BASED ON THE 31-RESIDUE AMINO-TERMINAL SUBDOMAIN OF HUMAN GRANULIN A


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Design and solution structure of a well-folded stack of two beta-hairpins based on the amino-terminal fragment of human granulin A.

Tolkatchev, D.Ng, A.Vranken, W.Ni, F.

(2000) Biochemistry 39: 2878-2886

  • DOI: https://doi.org/10.1021/bi992130u
  • Primary Citation of Related Structures:  
    1G26

  • PubMed Abstract: 

    Four amino acid substitutions were introduced into a peptide corresponding to the amino-terminal subdomain (30-31 residues) of human granulin A (HGA) in order to assess the contributions of a hydrophobic framework and other interactions to structure stabilization of the stack of two beta-hairpins. The resulting hybrid peptide, HGA 1-31 (D1V, K3H, S9I, Q20P) with four free cysteines, spontaneously formed a uniquely disulfide-bonded isomer with an expected [1-3, 2-4] disulfide pairing pattern. This peptide was characterized in detail by use of NMR and shown to assume a highly stable structure in solution, in contrast to the amino-terminal 1-30 fragment of human granulin A. The prototype peptide, or HGA 1-30 (C17S, C27S), had lower resistance to chemical reduction and proteolysis, broad NH and H(alpha) proton resonances, lower proton resonance dispersion, and no slowly exchanging amide protons. Two other peptides, HGA 1-30 (C17S, Q20P, C27S) and HGA 1-31 (D1V, K3H, S9I, C17S, C27S), with either Pro20 stabilizing a potential reverse turn or with a hydrophobic cluster consisting of Val1, His3, and Ile9, had sharper and slightly better dispersed NH and H(alpha) proton resonances, but still no slowly exchanging amide protons. The solution structure of HGA 1-31 (D1V, K3H, S9I, Q20P) indicates that it adopts a well-folded conformation of a stack of two beta-hairpins, as found for the amino-terminal subdomain of the prototypic carp granulin-1 with representative beta-hairpin stacks. These results highlight the importance of both hydrophobic and turn-stabilizing interactions for the structural integrity of the hairpin stack scaffold. The conformational stability appears to be maintained by a combination of the well-formed second beta-hairpin and two hydrophobic clusters, one located at the interface between the two beta-hairpins and the other on "top" of the first beta-hairpin. The implications of these findings for the design of conformationally stable hairpin stacks are discussed.


  • Organizational Affiliation

    Biomolecular NMR Laboratory and the Montreal Joint Centre for Structural Biology, Biotechnology Research Institute, National Research Council of Canada, Montreal, Quebec, Canada H4P 2R2.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GRANULIN A31N/AMutation(s): 4 
UniProt & NIH Common Fund Data Resources
Find proteins for P28799 (Homo sapiens)
Explore P28799 
Go to UniProtKB:  P28799
PHAROS:  P28799
GTEx:  ENSG00000030582 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP28799
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-11-01
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-10-30
    Changes: Data collection, Structure summary