8MHT

CYTOSINE-SPECIFIC METHYLTRANSFERASE HHAI/DNA COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.76 Å
  • R-Value Work: 0.174 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structures of HhaI methyltransferase complexed with substrates containing mismatches at the target base.

O'Gara, M.Horton, J.R.Roberts, R.J.Cheng, X.

(1998) Nat Struct Biol 5: 872-877

  • DOI: 10.1038/2312
  • Primary Citation of Related Structures:  
    7MHT, 8MHT, 9MHT

  • PubMed Abstract: 
  • Three structures have been determined for complexes between HhaI methyltransferase (M.HhaI) and oligonucleotides containing a G:A, G:U or G:AP (AP = abasic or apurinic/apyrimidinic) mismatch at the target base pair. The mismatched adenine, uracil and abasic site are all flipped out of the DNA helix and located in the enzyme's active-site pocket, adopting the same conformation as in the flipped-out normal substrate ...

    Three structures have been determined for complexes between HhaI methyltransferase (M.HhaI) and oligonucleotides containing a G:A, G:U or G:AP (AP = abasic or apurinic/apyrimidinic) mismatch at the target base pair. The mismatched adenine, uracil and abasic site are all flipped out of the DNA helix and located in the enzyme's active-site pocket, adopting the same conformation as in the flipped-out normal substrate. These results, particularly the flipped-out abasic deoxyribose sugar, provide insight into the mechanism of base flipping. If the process involves the protein pushing the base out of the helix, then the push must take place not on the base, but rather on the sugar-phosphate backbone. Thus rotation of the DNA backbone is probably the key to base flipping.


    Organizational Affiliation

    Pfizer Central Research, Discovery Biology, Sandwich, Kent, England.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
CYTOSINE-SPECIFIC METHYLTRANSFERASE HHAIC [auth A]327Haemophilus haemolyticusMutation(s): 0 
EC: 2.1.1.73 (PDB Primary Data), 2.1.1.37 (UniProt)
UniProt
Find proteins for P05102 (Haemophilus parahaemolyticus)
Explore P05102 
Go to UniProtKB:  P05102
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05102
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-D(P*GP*TP*CP*AP*GP*CP*GP*CP*AP*TP*GP*G)-3'A [auth C]12N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-D(P*CP*CP*AP*TP*GP*UP*GP*CP*TP*GP*AP*C)-3'B [auth D]12N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.76 Å
  • R-Value Work: 0.174 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.86α = 90
b = 99.86β = 90
c = 325.2γ = 120
Software Package:
Software NamePurpose
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-11-30
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance