Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Biological Assembly 3  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 3 assigned by authors.

Macromolecule Content

• Total Structure Weight: 92.40 kDa 
• Atom Count: 6319 
• Modelled Residue Count: 792 
• Deposited Residue Count: 832 
• Unique protein chains: 1

3IAA

Crystal Structure of CalG2, Calicheamicin Glycosyltransferase, TDP bound form

• PDB DOI: 10.2210/pdb3IAA/pdb

• Classification: TRANSFERASE
• Organism(s): Micromonospora echinospora
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-07-13 Released: 2010-06-02 
• Deposition Author(s): Chang, A., Singh, S., Bingman, C.A., Thorson, J.S., Phillips Jr., G.N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.238 
• R-Value Work: 0.184 
• R-Value Observed: 0.188 

Literature

Complete set of glycosyltransferase structures in the calicheamicin biosynthetic pathway reveals the origin of regiospecificity.

Chang, A., Singh, S., Helmich, K.E., Goff, R.D., Bingman, C.A., Thorson, J.S., Phillips, G.N.

(2011) Proc Natl Acad Sci U S A 108: 17649-17654

• PubMed: 21987796 
• DOI: 10.1073/pnas.1108484108
• Primary Citation of Related Structures:  
  3IA7, 3IAA, 3OTG, 3OTH, 3OTI, 3RSC


• PubMed Abstract: 
  

Glycosyltransferases are useful synthetic catalysts for generating natural products with sugar moieties. Although several natural product glycosyltransferase structures have been reported, design principles of glycosyltransferase engineering for the generation of glycodiversified natural products has fallen short of its promise, partly due to a lack of understanding of the relationship between structure and function. Here, we report structures of all four calicheamicin glycosyltransferases (CalG1, CalG2, CalG3, and CalG4), whose catalytic functions are clearly regiospecific. Comparison of these four structures reveals a conserved sugar donor binding motif and the principles of acceptor binding region reshaping. Among them, CalG2 possesses a unique catalytic motif for glycosylation of hydroxylamine. Multiple glycosyltransferase structures in a single natural product biosynthetic pathway are a valuable resource for understanding regiospecific reactions and substrate selectivities and will help future glycosyltransferase engineering.

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Organizational Affiliation: 

Department of Biochemistry, University of Wisconsin, 433 Babcock Drive, Madison, WI 53706, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CalG2	A, B	416	Micromonospora echinospora	Mutation(s): 0  Gene Names: calG2, Q8KNE0
UniProt
Find proteins for Q8KNE0 (Micromonospora echinospora) Explore Q8KNE0  Go to UniProtKB:  Q8KNE0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TYD	C [auth A], D [auth B]	THYMIDINE-5'-DIPHOSPHATE C10 H16 N2 O11 P2 UJLXYODCHAELLY-XLPZGREQSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A, B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.238 
• R-Value Work: 0.184 
• R-Value Observed: 0.188 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 88.787	α = 90
b = 48.539	β = 101.79
c = 107.565	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing
RESOLVE	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction
HKL-2000	data collection
HKL-2000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-07-13 
• Released Date: 2010-06-02 
Deposition Author(s): Chang, A., Singh, S., Bingman, C.A., Thorson, J.S., Phillips Jr., G.N.

Revision History  

• Version 1.0: 2010-06-02
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2011-11-02
  Changes: Database references
• Version 1.3: 2017-11-01
  Changes: Refinement description