2KYQ

1H, 15N, 13C chemical shifts and structure of CKR-brazzein


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural role of the terminal disulfide bond in the sweetness of brazzein.

Dittli, S.M.Rao, H.Tonelli, M.Quijada, J.Markley, J.L.Max, M.Assadi-Porter, F.

(2011) Chem Senses 36: 821-830

  • DOI: 10.1093/chemse/bjr057
  • Primary Citation of Related Structures:  2L07

  • PubMed Abstract: 
  • Brazzein, a 54 residue sweet-tasting protein, is thought to participate in a multipoint binding interaction with the sweet taste receptor. Proposed sites for interaction with the receptor include 2 surface loops and the disulfide bond that connects t ...

    Brazzein, a 54 residue sweet-tasting protein, is thought to participate in a multipoint binding interaction with the sweet taste receptor. Proposed sites for interaction with the receptor include 2 surface loops and the disulfide bond that connects the N- and C-termini. However, the importance of each site is not well understood. To characterize the structural role of the termini in the sweetness of brazzein, the position of the disulfide bond connecting the N- and C-termini was shifted by substituting K3-C4-K5 with C3-K4-R5. The apparent affinity and V(max) of the C3-K4-R5-brazzein (CKR-brazzein) variant were only modestly decreased compared with the wild-type (WT) brazzein. We determined a high-resolution structure of CKR-brazzein by nuclear magnetic resonance spectroscopy (backbone root mean square deviation of 0.39 Å). Comparing the structure of CKR-brazzein with that of WT-brazzein revealed that the terminal β-strands of the variant display extended β-structure and increased dynamics relative to WT-brazzein. These results support previous mutagenesis studies and further suggest that, whereas interactions involving the termini are necessary for full function of brazzein, the termini do not constitute the primary site of interaction between brazzein and the sweet taste receptor.


    Related Citations: 
    • Insights into the sweetness of brazzein from beta-hairpin peptides derived from the N- and C- termini of brazzein
      Dittli, S.M.
      () TO BE PUBLISHED --: --


    Organizational Affiliation

    Biochemistry Department, University of Wisconsin-Madison, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Defensin-like protein
A
53Pentadiplandra brazzeanaN/A
Find proteins for P56552 (Pentadiplandra brazzeana)
Go to UniProtKB:  P56552
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2KYQ Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-05-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-08-03
    Type: Database references
  • Version 1.3: 2011-11-30
    Type: Database references