2G1P

Structure of E. coli DNA adenine methyltransferase (DAM)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure and substrate recognition of the Escherichia coli DNA adenine methyltransferase.

Horton, J.R.Liebert, K.Bekes, M.Jeltsch, A.Cheng, X.

(2006) J.Mol.Biol. 358: 559-570

  • DOI: 10.1016/j.jmb.2006.02.028

  • PubMed Abstract: 
  • The structure of the Escherichia coli Dam DNA-(adenine-N6)-methyltransferase in complex with cognate DNA was determined at 1.89 A resolution in the presence of S-adenosyl-L-homocysteine. DNA recognition and the dynamics of base-flipping were studied ...

    The structure of the Escherichia coli Dam DNA-(adenine-N6)-methyltransferase in complex with cognate DNA was determined at 1.89 A resolution in the presence of S-adenosyl-L-homocysteine. DNA recognition and the dynamics of base-flipping were studied by site-directed mutagenesis, DNA methylation kinetics and fluorescence stopped-flow experiments. Our data illustrate the mechanism of coupling of DNA recognition and base-flipping. Contacts to the non-target strand in the second (3') half of the GATC site are established by R124 to the fourth base-pair, and by L122 and P134 to the third base-pair. The aromatic ring of Y119 intercalates into the DNA between the second and third base-pairs, which is essential for base-flipping to occur. Compared to previous published structures of bacteriophage T4 Dam, three major new observations are made in E.coli Dam. (1) The first Gua is recognized by K9, removal of which abrogates the first base-pair recognition. (2) The flipped target Ade binds to the surface of EcoDam in the absence of S-adenosyl-L-methionine, which illustrates a possible intermediate in the base-flipping pathway. (3) The orphaned Thy residue displays structural flexibility by adopting an extrahelical or intrahelical position where it is in contact to N120.


    Organizational Affiliation

    Department of Biochemistry, Emory University School of Medicine, 1510 Clifton Road, Atlanta, GA 30322, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DNA adenine methylase
A, B
278Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: dam
EC: 2.1.1.72
Find proteins for P0AEE8 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEE8
Entity ID: 1
MoleculeChainsLengthOrganism
5'-D(*TP*CP*TP*AP*GP*AP*TP*CP*TP*AP*GP*A)-3'F,G12N/A
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
SAH
Query on SAH

Download SDF File 
Download CCD File 
A, B
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 46.200α = 90.00
b = 71.300β = 90.03
c = 97.800γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
HKL-2000data reduction
GLRFphasing
HKL-2000data collection
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-11-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance