4RTK

Complex of Escherichia coli DNA Adenine Methyltransferase (DAM) with SAH and with DNA Containing Distal Pap Regulon Sequence

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.211 

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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

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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA adenine methylaseA298Escherichia coli str. K-12 substr. MDS42Mutation(s): 0 
Gene Names: dam, ECMDS42_2833
EC: 2.1.1.72
UniProt
Find proteins for P0AEE8 (Escherichia coli (strain K12))
Explore P0AEE8 
Go to UniProtKB:  P0AEE8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AEE8
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*TP*CP*TP*AP*AP*AP*GP*AP*TP*CP*G)-3')B [auth F]11synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*AP*CP*GP*AP*TP*CP*TP*TP*TP*AP*G)-3')C [auth G]11synthetic construct
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SAH
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
GOL
Query on GOL
Download Ideal Coordinates CCD File 
E [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.211 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.331α = 90
b = 63.044β = 90
c = 142.185γ = 90
Software Package:
Software NamePurpose
SERGUIdata collection
GLRFphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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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