Biological Assembly 1  

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 76.77 kDa 
• Atom Count: 5,303 
• Modelled Residue Count: 666 
• Deposited Residue Count: 696 
• Unique protein chains: 1

 3LST

Crystal Structure of CalO1, Methyltransferase in Calicheamicin Biosynthesis, SAH bound form

• PDB DOI:  https://doi.org/10.2210/pdb3LST/pdb

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


• Deposited: 2010-02-12 Released: 2010-03-02 
• Deposition Author(s): Chang, A., Singh, S., Bingman, C.A., Thorson, J.S., Phillips Jr., G.N., Center for Eukaryotic Structural Genomics (CESG)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.251 
• R-Value Work: 0.200 
• R-Value Observed: 0.203 

Literature

Structural characterization of CalO1: a putative orsellinic acid methyltransferase in the calicheamicin-biosynthetic pathway.

Chang, A., Singh, S., Bingman, C.A., Thorson, J.S., Phillips, G.N.

(2011) Acta Crystallogr D Biol Crystallogr 67: 197-203

• PubMed: 21358050 
• DOI: https://doi.org/10.1107/S090744491100360X
• Primary Citation of Related Structures:  
  3LST


• PubMed Abstract: 
  

The X-ray structure determination at 2.4 Å resolution of the putative orsellinic acid C3 O-methyltransferase (CalO1) involved in calicheamicin biosynthesis is reported. Comparison of CalO1 with a homology model of the functionally related calicheamicin orsellinic acid C2 O-methyltransferase (CalO6) implicates several residues that are likely to contribute to the regiospecificity of alkylation. Consistent with the proposed requirement of an acyl-carrier-protein-bound substrate, this structural study also reveals structural determinants within CalO1 that are anticipated to accommodate an association with an acyl carrier protein.

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Organizational Affiliation: 

Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CalO1 Methyltransferase	A, B	348	Micromonospora echinospora	Mutation(s): 0  Gene Names: calO1
UniProt
Find proteins for Q8KNE5 (Micromonospora echinospora) Explore Q8KNE5  Go to UniProtKB:  Q8KNE5

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SAH	C [auth A], E [auth B]	S-ADENOSYL-L-HOMOCYSTEINE C14 H20 N6 O5 S ZJUKTBDSGOFHSH-WFMPWKQPSA-N
EDO	D [auth A], F [auth B]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-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: 2.40 Å
• R-Value Free: 0.251 
• R-Value Work: 0.200 
• R-Value Observed: 0.203 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.515	α = 90
b = 93.603	β = 90
c = 240.971	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-03-02 
Deposition Author(s): Chang, A., Singh, S., Bingman, C.A., Thorson, J.S., Phillips Jr., G.N., Center for Eukaryotic Structural Genomics (CESG)

Revision History  

• Version 1.0: 2010-03-02
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2017-11-01
  Changes: Refinement description