A complex structure of H25A mutant of glycosyltransferase with UDP

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 

Starting Model: experimental
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Hydrophobic recognition allows the glycosyltransferase UGT76G1 to catalyze its substrate in two orientations.

Yang, T.Zhang, J.Ke, D.Yang, W.Tang, M.Jiang, J.Cheng, G.Li, J.Cheng, W.Wei, Y.Li, Q.Naismith, J.H.Zhu, X.

(2019) Nat Commun 10: 3214-3214

  • DOI: https://doi.org/10.1038/s41467-019-11154-4
  • Primary Citation of Related Structures:  
    6INF, 6ING, 6INH, 6INI

  • PubMed Abstract: 

    Diets high in sugar are recognized as a serious health problem, and there is a drive to reduce their consumption. Steviol glycosides are natural zero-calorie sweeteners, but the most desirable ones are biosynthesized with low yields. UGT76G1 catalyzes the β (1-3) addition of glucose to steviol glycosides, which gives them the preferred taste. UGT76G1 is able to transfer glucose to multiple steviol substrates yet remains highly specific in the glycosidic linkage it creates. Here, we report multiple complex structures of the enzyme combined with biochemical data, which reveal that the enzyme utilizes hydrophobic interactions for substrate recognition. The lack of a strict three-dimensional recognition arrangement, typical of hydrogen bonds, permits two different orientations for β (1-3) sugar addition. The use of hydrophobic recognition is unusual in a regio- and stereo-specific catalysis. Harnessing such non-specific hydrophobic interactions could have wide applications in the synthesis of complex glycoconjugates.

  • Organizational Affiliation

    Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University; State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, 610064, Chengdu, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UDP-glycosyltransferase 76G1466Stevia rebaudianaMutation(s): 1 
Gene Names: UGT76G1
EC: 2.4.1
Find proteins for Q6VAB4 (Stevia rebaudiana)
Explore Q6VAB4 
Go to UniProtKB:  Q6VAB4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6VAB4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.946α = 90
b = 98.946β = 90
c = 88.967γ = 120
Software Package:
Software NamePurpose
DIALSdata reduction
DIALSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31771910
National Natural Science Foundation of ChinaChina21534008

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-31
    Type: Initial release
  • Version 1.1: 2023-11-22
    Changes: Data collection, Database references, Refinement description