5O7Q

Crystal structure of a single chain monellin mutant (Y65R) pH 5.5

• PDB DOI: https://doi.org/10.2210/pdb5O7Q/pdb

• Classification: PLANT PROTEIN
• Organism(s): Dioscoreophyllum cumminsii
• Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
• Mutation(s): No 


• Deposited: 2017-06-09 Released: 2018-01-10 
• Deposition Author(s): Pica, A., Merlino, A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.72 Å
• R-Value Free: 0.271 
• R-Value Work: 0.218 
• R-Value Observed: 0.221 

Literature

pH driven fibrillar aggregation of the super-sweet protein Y65R-MNEI: A step-by-step structural analysis.

Pica, A., Leone, S., Di Girolamo, R., Donnarumma, F., Emendato, A., Rega, M.F., Merlino, A., Picone, D.

(2017) Biochim Biophys Acta 1862: 808-815

• PubMed: 29288772 
• DOI: https://doi.org/10.1016/j.bbagen.2017.12.012
• Primary Citation of Related Structures:  
  5O7K, 5O7L, 5O7Q, 5O7R, 5O7S


• PubMed Abstract: 
  

  MNEI and its variant Y65R-MNEI are sweet proteins with potential applications as sweeteners in food industry. Also, they are often used as model systems for folding and aggregation studies.

---

Organizational Affiliation: 

Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cintia, I-80126 Napoli, Italy.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 23.15 kDa 
• Atom Count: 1,721 
• Modelled Residue Count: 186 
• Deposited Residue Count: 192 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Monellin chain B,Monellin chain A	A, B	96	Dioscoreophyllum cumminsii	Mutation(s): 0
UniProt
Find proteins for P02881 (Dioscoreophyllum cumminsii) Explore P02881  Go to UniProtKB:  P02881
Find proteins for P02882 (Dioscoreophyllum cumminsii) Explore P02882  Go to UniProtKB:  P02882
UniProt Groups	P02881P02882

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PEG	H [auth B]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N
SO4	C [auth A], D [auth A], E [auth A], F [auth B], G [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.72 Å
• R-Value Free: 0.271 
• R-Value Work: 0.218 
• R-Value Observed: 0.221 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 35.339	α = 90
b = 84.545	β = 90
c = 130.517	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2018-01-10 
Deposition Author(s): Pica, A., Merlino, A.

Revision History  

• Version 1.0: 2018-01-10
  Type: Initial release
  
• Version 1.1: 2018-02-07
  Changes: Database references
• Version 1.2: 2024-01-17
  Changes: Data collection, Database references, Refinement description