Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 61227.64 
• Atom Count: 3944 
• Residue Count: 520 
• Unique protein chains: 1

1G60

Crystal Structure of Methyltransferase MboIIa (Moraxella bovis)

• DOI: 10.2210/pdb1G60/pdb

• Classification: TRANSFERASE
• Organism(s): Moraxella bovis
• Expression System: Escherichia coli


• Deposited: 2000-11-02 Released: 2002-05-01 
• Deposition Author(s): Osipiuk, J., Walsh, M.A., Joachimiak, A., Midwest Center for Structural Genomics (MCSG)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.74 Å
• R-Value Free: 0.221 
• R-Value Work: 0.198 

Literature

Crystal structure of MboIIA methyltransferase.

Osipiuk, J., Walsh, M.A., Joachimiak, A.

(2003) Nucleic Acids Res. 31: 5440-5448

• PubMed: 12954781 


• PubMed Abstract: 
  

DNA methyltransferases (MTases) are sequence-specific enzymes which transfer a methyl group from S-adenosyl-L-methionine (AdoMet) to the amino group of either cytosine or adenine within a recognized DNA sequence. Methylation of a base in a specific DNA sequence protects DNA from nucleolytic cleavage by restriction enzymes recognizing the same DNA sequence. We have determined at 1.74 A resolution the crystal structure of a beta-class DNA MTase MboIIA (M.MboIIA) from the bacterium Moraxella bovis, the smallest DNA MTase determined to date. M.MboIIA methylates the 3' adenine of the pentanucleotide sequence 5'-GAAGA-3'. The protein crystallizes with two molecules in the asymmetric unit which we propose to resemble the dimer when M.MboIIA is not bound to DNA. The overall structure of the enzyme closely resembles that of M.RsrI. However, the cofactor-binding pocket in M.MboIIA forms a closed structure which is in contrast to the open-form structures of other known MTases.

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Related Citations: 

• Cloning and Characterization of the MboII Restriction-modification System
  Bocklage, H.,Heeger, K.,Muller-Hill, B.
  (1991) Nucleic Acids Res. 19: 1007




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Organizational Affiliation: 

Argonne National Laboratory, Biosciences Division and Structural Biology Center, 9700 South Cass Avenue, Argonne, IL 60439, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Adenine-specific Methyltransferase MboIIA	A, B	260	Moraxella bovis	Mutation(s): 0  Gene Names: mboIIM EC: 2.1.1.72
Find proteins for P23192 (Moraxella bovis) Go to UniProtKB:  P23192

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NA	A, B	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N
SAM	A, B	S-ADENOSYLMETHIONINE C15 H22 N6 O5 S MEFKEPWMEQBLKI-FCKMPRQPSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.74 Å
• R-Value Free: 0.221 
• R-Value Work: 0.198 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 60.818	α = 90.00
b = 98.699	β = 101.93
c = 50.894	γ = 90.00

Software Package:

Software Name	Purpose
HKL-2000	data collection
SCALEPACK	data scaling
CNS	phasing
CNS	refinement
REFMAC	refinement
HKL-2000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-11-02 
• Released Date: 2002-05-01 
• Deposition Author(s): Osipiuk, J., Walsh, M.A., Joachimiak, A., Midwest Center for Structural Genomics (MCSG)

Revision History 

• Version 1.0: 2002-05-01
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance