6PBD

DNA N6-Adenine Methyltransferase CcrM In Complex with Double-Stranded DNA Oligonucleotide Containing Its Recognition Sequence GAATC


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.34 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

The cell cycle-regulated DNA adenine methyltransferase CcrM opens a bubble at its DNA recognition site.

Horton, J.R.Woodcock, C.B.Opot, S.B.Reich, N.O.Zhang, X.Cheng, X.

(2019) Nat Commun 10: 4600-4600

  • DOI: https://doi.org/10.1038/s41467-019-12498-7
  • Primary Citation of Related Structures:  
    6PBD

  • PubMed Abstract: 

    The Caulobacter crescentus cell cycle-regulated DNA methyltransferase (CcrM) methylates the adenine of hemimethylated GANTC after replication. Here we present the structure of CcrM in complex with double-stranded DNA containing the recognition sequence. CcrM contains an N-terminal methyltransferase domain and a C-terminal nonspecific DNA-binding domain. CcrM is a dimer, with each monomer contacting primarily one DNA strand: the methyltransferase domain of one molecule binds the target strand, recognizes the target sequence, and catalyzes methyl transfer, while the C-terminal domain of the second molecule binds the non-target strand. The DNA contacts at the 5-base pair recognition site results in dramatic DNA distortions including bending, unwinding and base flipping. The two DNA strands are pulled apart, creating a bubble comprising four recognized base pairs. The five bases of the target strand are recognized meticulously by stacking contacts, van der Waals interactions and specific Watson-Crick polar hydrogen bonds to ensure high enzymatic specificity.


  • Organizational Affiliation

    Department of Epigenetics and Molecular Carcinogenesis, University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Modification methylase CcrMI
A, B
366Caulobacter vibrioidesMutation(s): 0 
Gene Names: ccrMIMccrMCC_0378
EC: 2.1.1.72
UniProt
Find proteins for P0CAW2 (Caulobacter vibrioides (strain ATCC 19089 / CIP 103742 / CB 15))
Explore P0CAW2 
Go to UniProtKB:  P0CAW2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0CAW2
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*CP*GP*AP*TP*TP*CP*AP*AP*TP*GP*AP*AP*TP*CP*CP*CP*AP*AP*G)-3')C [auth X]19synthetic construct
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(*GP*CP*TP*TP*GP*GP*GP*AP*TP*TP*CP*AP*TP*TP*GP*AP*AP*TP*C)-3')D [auth Y]19synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.34 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.683α = 90
b = 117.939β = 90
c = 119.598γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM049245-23

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-23
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description