Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 11803.30 
• Atom Count: 1074 
• Residue Count: 97 
• Unique protein chains: 1

2O9U

Monellin (MNEI) at 1.15 resolution

• DOI: 10.2210/pdb2O9U/pdb

• Classification: PLANT PROTEIN
• Organism(s): Dioscoreophyllum cumminsii
• Expression System: Escherichia coli


• Deposited: 2006-12-14 Released: 2007-02-20 
• Deposition Author(s): Hobbs, J.R., Munger, S.D., Conn, G.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.15 Å
• R-Value Free: 0.165 
• R-Value Work: 0.131 

Literature

Monellin (MNEI) at 1.15 A resolution

Hobbs, J.R., Munger, S.D., Conn, G.L.

(2007) Acta Crystallogr.,Sect.F 63: 162-167

• PubMed: 17329805 
• DOI: 10.1107/S1744309107005271


• PubMed Abstract: 
  

The X-ray crystal structure of a single-chain monellin protein (MNEI) has been determined at 1.15 A resolution. The model was refined to convergence employing anisotropic displacement parameters and riding H atoms to produce a final model with R(work) and R(free) values of 0.132 and 0.162, respectively. The crystal contains a single MNEI protein in the asymmetric unit and unusually lacks the dimer interface observed in all previous crystal structures of monellin and its single-chain derivatives. The high resolution allowed a more detailed view of MNEI than previously possible, with 38 of the 96 residues modelled with alternative side-chain conformations, including four core residues Thr12, Cys41, Leu62 and Ile75. Four stably bound negative ions were also located, providing new insight into potential electrostatic interactions of MNEI with the largely negatively charged surface of the sweet taste receptor T1R2-T1R3.

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Organizational Affiliation: 

Manchester Interdisciplinary Biocentre, Faculty of Life Sciences, University of Manchester, Manchester M60 1QD, England.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Monellin chain B and Monellin chain A	X	97	Dioscoreophyllum cumminsii	Mutation(s): 0
Find proteins for P02882 (Dioscoreophyllum cumminsii) Go to UniProtKB:  P02882

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	X	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.15 Å
• R-Value Free: 0.165 
• R-Value Work: 0.131 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 27.103	α = 90.00
b = 66.316	β = 111.60
c = 27.154	γ = 90.00

Software Package:

Software Name	Purpose
ADSC	data collection
CCP4	data scaling
MOSFLM	data reduction
REFMAC	refinement
MOLREP	phasing
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-12-14 
• Released Date: 2007-02-20 
• Deposition Author(s): Hobbs, J.R., Munger, S.D., Conn, G.L.

Revision History 

• Version 1.0: 2007-02-20
  Type: Initial release
• Version 1.1: 2008-05-01
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2017-08-16
  Type: Advisory, Refinement description, Source and taxonomy