1YA6

alpha-glucosyltransferase in complex with UDP and a 13-mer DNA containing a central A:G mismatch


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.230 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Structural evidence of a passive base-flipping mechanism for AGT, an unusual GT-B glycosyltransferase.

Lariviere, L.Sommer, N.Morera, S.

(2005) J Mol Biol 352: 139-150

  • DOI: https://doi.org/10.1016/j.jmb.2005.07.007
  • Primary Citation of Related Structures:  
    1XV5, 1Y6F, 1Y6G, 1Y8Z, 1YA6

  • PubMed Abstract: 

    The Escherichia coli T4 bacteriophage uses two glycosyltransferases to glucosylate and thus protect its DNA: the retaining alpha-glucosyltransferase (AGT) and the inverting beta-glucosyltransferase (BGT). They glucosylate 5-hydroxymethyl cytosine (5-HMC) bases of duplex DNA using UDP-glucose as the sugar donor to form an alpha-glucosidic linkage and a beta-glucosidic linkage, respectively. Five structures of AGT have been determined: a binary complex with the UDP product and four ternary complexes with UDP or UDP-glucose and oligonucleotides containing an A:G, HMU:G (hydroxymethyl uracyl) or AP:G (apurinic/apyrimidinic) mismatch at the target base-pair. AGT adopts the GT-B fold, one of the two folds known for GTs. However, while the sugar donor binding mode is classical for a GT-B enzyme, the sugar acceptor binding mode is unexpected and breaks the established consensus: AGT is the first GT-B enzyme that predominantly binds both the sugar donor and acceptor to the C-terminal domain. Its active site pocket is highly similar to four retaining GT-B glycosyltransferases (trehalose-6-phosphate synthase, glycogen synthase, glycogen and maltodextrin phosphorylases) strongly suggesting a common evolutionary origin and catalytic mechanism for these enzymes. Structure-guided mutagenesis and kinetic analysis do not permit identification of a nucleophile residue responsible for a glycosyl-enzyme intermediate for the classical double displacement mechanism. Interestingly, the DNA structures reveal partially flipped-out bases. They provide evidence for a passive role of AGT in the base-flipping mechanism and for its specific recognition of the acceptor base.


  • Organizational Affiliation

    Laboratoire d'Enzymologie et Biochimie Structurales, UPR 9063 CNRS, Bât.34, 91198-Gif-sur-Yvette, France.


Macromolecules

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
DNA alpha-glucosyltransferaseC [auth A],
D [auth B]
403Tequatrovirus T4Mutation(s): 0 
EC: 2.4.1.26
UniProt
Find proteins for P04519 (Enterobacteria phage T4)
Explore P04519 
Go to UniProtKB:  P04519
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04519
Sequence Annotations
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  • Reference Sequence

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Entity ID: 1
MoleculeChains LengthOrganismImage
5'-D(*AP*TP*AP*CP*TP*AP*AP*GP*AP*TP*AP*G)-3'A [auth C]12N/A
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
5'-D(*CP*TP*AP*TP*CP*TP*GP*AP*GP*TP*AP*T)-3'B [auth D]12N/A
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
UDP
Query on UDP

Download Ideal Coordinates CCD File 
I [auth A],
M [auth B]
URIDINE-5'-DIPHOSPHATE
C9 H14 N2 O12 P2
XCCTYIAWTASOJW-XVFCMESISA-N
NCO
Query on NCO

Download Ideal Coordinates CCD File 
E [auth D]
F [auth A]
G [auth A]
H [auth A]
J [auth B]
E [auth D],
F [auth A],
G [auth A],
H [auth A],
J [auth B],
K [auth B],
L [auth B]
COBALT HEXAMMINE(III)
Co H18 N6
DYLMFCCYOUSRTK-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.230 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.855α = 90
b = 119.318β = 92.87
c = 86.812γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-30
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description