2LY6 | pdb_00002ly6

Refined solution structure of recombinant brazzein at low temperature

• PDB DOI: https://doi.org/10.2210/pdb2LY6/pdb
• BMRB: 18710

• Classification: PLANT PROTEIN
• Organism(s): Pentadiplandra brazzeana
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2012-09-12 Released: 2012-10-17 
• Deposition Author(s): Cornilescu, C.C., Cornilescu, G., Tonelli, M., Markley, J.L., Assadi-Porter, F.M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 15 
• Selection Criteria: structures with the lowest energy 

Literature

Temperature-dependent conformational change affecting Tyr11 and sweetness loops of brazzein.

Cornilescu, C.C., Cornilescu, G., Rao, H., Porter, S.F., Tonelli, M., Derider, M.L., Markley, J.L., Assadi-Porter, F.M.

(2013) Proteins 81: 919-925

• PubMed: 23349025 
• DOI: https://doi.org/10.1002/prot.24259
• Primary Citation Related Structures: 
  2LY5, 2LY6


• PubMed Abstract: 
  

  The sweet protein brazzein, a member of the Csβα fold family, contains four disulfide bonds that lend a high degree of thermal and pH stability to its structure. Nevertheless, a variable temperature study has revealed that the protein undergoes a local, reversible conformational change between 37 and 3°C with a midpoint about 27°C that changes the orientations and side-chain hydrogen bond partners of Tyr8 and Tyr11. To test the functional significance of this effect, we used NMR saturation transfer to investigate the interaction between brazzein and the amino terminal domain of the sweet receptor subunit T1R2; the results showed a stronger interaction at 7°C than at 37°C. Thus the low temperature conformation, which alters the orientations of two loops known to be critical for the sweetness of brazzein, may represent the bound state of brazzein in the complex with the human sweet receptor.

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Organizational Affiliation: 
• National Magnetic Resonance Facility at Madison, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 6.38 kDa 
• Atom Count: 439 
• Modeled Residue Count: 53 
• Deposited Residue Count: 53 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Defensin-like protein	A	53	Pentadiplandra brazzeana	Mutation(s): 0
UniProt
Find proteins for P56552 (Pentadiplandra brazzeana) Explore P56552  Go to UniProtKB:  P56552

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 15 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-10-17 
Deposition Author(s): Cornilescu, C.C., Cornilescu, G., Tonelli, M., Markley, J.L., Assadi-Porter, F.M.

Revision History  

• Version 1.0: 2012-10-17
  Type: Initial release
  
• Version 1.1: 2013-01-30
  Changes: Database references
• Version 1.2: 2013-02-06
  Changes: Database references
• Version 1.3: 2013-06-05
  Changes: Database references
• Version 1.4: 2023-06-14
  Changes: Data collection, Database references, Derived calculations, Other
• Version 1.5: 2024-11-06
  Changes: Data collection, Database references, Structure summary