4RTQ

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 

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Ligand Structure Quality Assessment 


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
  • Primary Citation of Related Structures:  
    4RTJ, 4RTK, 4RTL, 4RTM, 4RTN, 4RTO, 4RTP, 4RTQ, 4RTR, 4RTS

  • 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. Dam also controls virulence in many pathogenic Gram-negative bacteria ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA adenine methylaseA298Escherichia coli str. K-12 substr. MDS42Mutation(s): 0 
Gene Names: damECMDS42_2833
EC: 2.1.1.72
UniProt
Find proteins for P0AEE8 (Escherichia coli (strain K12))
Explore P0AEE8 
Go to UniProtKB:  P0AEE8
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*AP*CP*TP*TP*AP*AP*AP*CP*TP*TP*AP*A)-3')B [auth F]12synthetic construct
    Protein Feature View
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    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*TP*TP*TP*AP*AP*GP*TP*TP*TP*AP*AP*G)-3')C [auth G]12synthetic construct
      Protein Feature View
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      • Reference Sequence
      Small Molecules
      Ligands 2 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      SAH (Subject of Investigation/LOI)
      Query on SAH

      Download Ideal Coordinates CCD File 
      D [auth A]S-ADENOSYL-L-HOMOCYSTEINE
      C14 H20 N6 O5 S
      ZJUKTBDSGOFHSH-WFMPWKQPSA-N
       Ligand Interaction
      EDO
      Query on EDO

      Download Ideal Coordinates CCD File 
      E [auth G]1,2-ETHANEDIOL
      C2 H6 O2
      LYCAIKOWRPUZTN-UHFFFAOYSA-N
       Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.00 Å
      • R-Value Free: 0.196 
      • R-Value Work: 0.161 
      • R-Value Observed: 0.162 
      • Space Group: P 21 21 21
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 44.009α = 90
      b = 62.918β = 90
      c = 136.642γ = 90
      Software Package:
      Software NamePurpose
      SERGUIdata collection
      GLRFphasing
      PHENIXrefinement
      HKL-2000data reduction
      HKL-2000data scaling

      Structure Validation

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      Ligand Structure Quality Assessment  



      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • 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