6LF6

Crystal structure of ZmCGTa in complex with UDP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Dissection of the general two-step di- C -glycosylation pathway for the biosynthesis of (iso)schaftosides in higher plants.

Wang, Z.L.Gao, H.M.Wang, S.Zhang, M.Chen, K.Zhang, Y.Q.Wang, H.D.Han, B.Y.Xu, L.L.Song, T.Q.Yun, C.H.Qiao, X.Ye, M.

(2020) Proc Natl Acad Sci U S A 117: 30816-30823

  • DOI: https://doi.org/10.1073/pnas.2012745117
  • Primary Citation of Related Structures:  
    6LF6, 6LFN, 6LFZ, 6LG0, 6LG1

  • PubMed Abstract: 

    Schaftoside and isoschaftoside are bioactive natural products widely distributed in higher plants including cereal crops and medicinal herbs. Their biosynthesis may be related with plant defense. However, little is known on the glycosylation biosynthetic pathway of these flavonoid di- C -glycosides with different sugar residues. Herein, we report that the biosynthesis of (iso)schaftosides is sequentially catalyzed by two C -glycosyltransferases (CGTs), i.e., CGTa for C -glucosylation of the 2-hydroxyflavanone aglycone and CGTb for C -arabinosylation of the mono- C -glucoside. The two enzymes of the same plant exhibit high homology but remarkably different sugar acceptor and donor selectivities. A total of 14 CGTa and CGTb enzymes were cloned and characterized from seven dicot and monocot plants, including Scutellaria baicalensis , Glycyrrhiza uralensis , Oryza sativa ssp. japonica , and Zea mays , and the in vivo functions for three enzymes were verified by RNA interference and overexpression. Through transcriptome analysis, we found homologous genes in 119 other plants, indicating this pathway is general for the biosynthesis of (iso)schaftosides. Furthermore, we resolved the crystal structures of five CGTs and realized the functional switch of SbCGTb to SbCGTa by structural analysis and mutagenesis of key amino acids. The CGT enzymes discovered in this paper allow efficient synthesis of (iso)schaftosides, and the general glycosylation pathway presents a platform to study the chemical defense mechanisms of higher plants.


  • Organizational Affiliation

    State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 100191 Beijing, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UDP-glycosyltransferase 708A6476Zea maysMutation(s): 0 
Gene Names: UGT708A6
EC: 2.4.1
UniProt
Find proteins for A0A096SRM5 (Zea mays)
Explore A0A096SRM5 
Go to UniProtKB:  A0A096SRM5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A096SRM5
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
UDP
Query on UDP

Download Ideal Coordinates CCD File 
B [auth A]URIDINE-5'-DIPHOSPHATE
C9 H14 N2 O12 P2
XCCTYIAWTASOJW-XVFCMESISA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.85α = 90
b = 82.696β = 105.53
c = 58.693γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data scaling
PDB_EXTRACTdata extraction
DENZOdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-18
    Type: Initial release
  • Version 1.1: 2020-12-09
    Changes: Database references
  • Version 1.2: 2020-12-16
    Changes: Database references
  • Version 1.3: 2023-11-22
    Changes: Data collection, Database references, Refinement description