2HMY image
Entry Detail
PDB ID:
2HMY
Title:
BINARY COMPLEX OF HHAI METHYLTRANSFERASE WITH ADOMET FORMED IN THE PRESENCE OF A SHORT NONPSECIFIC DNA OLIGONUCLEOTIDE
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
1999-02-08
Release Date:
1999-03-19
Method Details:
Experimental Method:
Resolution:
2.61 Å
R-Value Work:
0.19
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:PROTEIN (CYTOSINE-SPECIFIC METHYLTRANSFERASE HHAI)
Chain IDs:A (auth: B)
Chain Length:327
Number of Molecules:1
Biological Source:Haemophilus haemolyticus
Ligand Molecules
Primary Citation
Structure of a binary complex of HhaI methyltransferase with S-adenosyl-L-methionine formed in the presence of a short non-specific DNA oligonucleotide.
J.Mol.Biol. 287 201 209 (1999)
PMID: 10080885 DOI: 10.1006/jmbi.1999.2608

Abstact

We have determined a structure for a complex formed between HhaI methyltransferase (M.HhaI) and S-adenosyl-L-methionine (AdoMet) in the presence of a non-specific short oligonucleotide. M.HhaI binds to the non-specific short oligonucleotides in solution. Although no DNA is incorporated in the crystal, AdoMet binds in a primed orientation, identical with that observed in the ternary complex of the enzyme, cognate DNA, and AdoMet or S-adenosyl-L-homocysteine (AdoHcy). This orientation differs from the previously observed unprimed orientation in the M.HhaI-AdoMet binary complex, where the S+-CH3 unit of AdoMet is protected by a favorable cation-pi interaction with Trp41. The structure suggests that the presence of DNA can guide AdoMet into the primed orientation. These results shed new light on the proposed ordered mechanism of binding and explains the stable association between AdoMet and M.HhaI.

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Primary Citation of related structures