Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 54557.54 
• Atom Count: 3524 
• Residue Count: 482 
• Unique protein chains: 1

2PQ6

Crystal structure of Medicago truncatula UGT85H2- Insights into the structural basis of a multifunctional (Iso) flavonoid glycosyltransferase

• DOI: 10.2210/pdb2PQ6/pdb

• Classification: TRANSFERASE
• Organism(s): Medicago truncatula
• Expression System: Escherichia coli BL21


• Deposited: 2007-05-01 Released: 2007-07-10 
• Deposition Author(s): Li, L., Modolo, L.V., Escamilla-Trevino, L.L., Wang, X.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Free: 0.241 
• R-Value Work: 0.197 

Literature

Crystal Structure of Medicago truncatula UGT85H2 - Insights into the Structural Basis of a Multifunctional (Iso)flavonoid Glycosyltransferase.

Li, L., Modolo, L.V., Escamilla-Trevino, L.L., Achnine, L., Dixon, R.A., Wang, X.

(2007) J.Mol.Biol. 370: 951-963

• PubMed: 17553523 
• DOI: 10.1016/j.jmb.2007.05.036


• PubMed Abstract: 
  

(Iso)flavonoids are a diverse group of plant secondary metabolites with important effects on plant, animal and human health. They exist in various glycosidic forms. Glycosylation, which may determine their bioactivities and functions, is controlled by specific plant uridine diphosphate glycosyltransferases (UGTs). We describe a new multifunctional (iso)flavonoid glycosyltransferase, UGT85H2, from the model legume Medicago truncatula with activity towards a number of phenylpropanoid-derived natural products including the flavonol kaempferol, the isoflavone biochanin A, and the chalcone isoliquiritigenin. The crystal structure of UGT85H2 has been determined at 2.1 A resolution, and reveals distinct structural features that are different from those of other UGTs and related to the enzyme's functions and substrate specificities. Structural and comparative analyses revealed the putative binding sites for the donor and acceptor substrates that are located in a large cleft formed between the two domains of the enzyme, and indicated that Trp360 may undergo a conformational change after sugar donor binding to the enzyme. UGT85H2 has higher specificity for flavonol than for isoflavone. Further substrate docking combined with enzyme activity assay and kinetic analysis provided structural insights into this substrate specificity and preference.

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Organizational Affiliation: 

Plant Biology Division, Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73401, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
UDP-glucuronosyl/UDP-glucosyltransferase	A	482	Medicago truncatula	Mutation(s): 0  Gene Names: 11408822 EC: 2.4.1.-
Find proteins for A6XNC5 (Medicago truncatula) Go to UniProtKB:  A6XNC5

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Free: 0.241 
• R-Value Work: 0.197 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 57.997	α = 90.00
b = 82.961	β = 90.00
c = 95.411	γ = 90.00

Software Package:

Software Name	Purpose
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
PHASES	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-05-01 
• Released Date: 2007-07-10 
• Deposition Author(s): Li, L., Modolo, L.V., Escamilla-Trevino, L.L., Wang, X.

Revision History 

• Version 1.0: 2007-07-10
  Type: Initial release
• Version 1.1: 2008-05-01
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance