4RTR

Complex of Escherichia coli DNA Adenine Methyltransferase (DAM) with AdoMet and a 5-bp non-canonical site (GTTTA )


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structures of Escherichia coli DNA adenine methyltransferase (Dam) in complex with a non-GATC sequence: potential implications for methylation-independent transcriptional repression.

Horton, J.R.Zhang, X.Blumenthal, R.M.Cheng, X.

(2015) Nucleic Acids Res 43: 4296-4308

  • DOI: 10.1093/nar/gkv251
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • DNA adenine methyltransferase (Dam) is widespread and conserved among the γ-proteobacteria. Methylation of the Ade in GATC sequences regulates diverse bacterial cell functions, including gene expression, mismatch repair and chromosome replication. Da ...

    DNA adenine methyltransferase (Dam) is widespread and conserved among the γ-proteobacteria. Methylation of the Ade in GATC sequences regulates diverse bacterial cell functions, including gene expression, mismatch repair and chromosome replication. Dam also controls virulence in many pathogenic Gram-negative bacteria. An unexplained and perplexing observation about Escherichia coli Dam (EcoDam) is that there is no obvious relationship between the genes that are transcriptionally responsive to Dam and the promoter-proximal presence of GATC sequences. Here, we demonstrate that EcoDam interacts with a 5-base pair non-cognate sequence distinct from GATC. The crystal structure of a non-cognate complex allowed us to identify a DNA binding element, GTYTA/TARAC (where Y = C/T and R = A/G). This element immediately flanks GATC sites in some Dam-regulated promoters, including the Pap operon which specifies pyelonephritis-associated pili. In addition, Dam interacts with near-cognate GATC sequences (i.e. 3/4-site ATC and GAT). Taken together, these results imply that Dam, in addition to being responsible for GATC methylation, could also function as a methylation-independent transcriptional repressor.


    Organizational Affiliation

    Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA xcheng@emory.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA adenine methylaseA298Escherichia coli str. K-12 substr. MDS42Mutation(s): 0 
Gene Names: damECMDS42_2833
EC: 2.1.1.72
Find proteins for P0AEE8 (Escherichia coli (strain K12))
Explore P0AEE8 
Go to UniProtKB:  P0AEE8
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*CP*TP*TP*AP*AP*AP*CP*TP*TP*AP*A)-3')F12synthetic construct
  • Find similar nucleic acids by: Sequence   |   Structure
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*TP*TP*TP*AP*AP*GP*TP*TP*TP*AP*AP*G)-3')G12synthetic construct
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SAM
Query on SAM

Download CCD File 
A
S-ADENOSYLMETHIONINE
C15 H22 N6 O5 S
MEFKEPWMEQBLKI-FCKMPRQPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.66α = 90
b = 62.922β = 90
c = 136.272γ = 90
Software Package:
Software NamePurpose
SERGUIdata collection
GLRFphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-04-15
    Type: Initial release
  • Version 1.1: 2015-04-22
    Changes: Database references
  • Version 1.2: 2015-05-20
    Changes: Database references