Download MendeleyStructure of the bacteriophage T4 DNA adenine methyltransferase
Yang, Z., Horton, J.R., Zhou, L., Zhang, X.J., Dong, A., Zhang, X., Schlagman, S.L., Kossykh, V., Hattman, S., Cheng, X.(2003) Nat Struct Biol 10: 849-855
- PubMed: 12937411
- DOI: https://doi.org/10.1038/nsb973
- Primary Citation of Related Structures:
1Q0S, 1Q0T - PubMed Abstract:
DNA-adenine methylation at certain GATC sites plays a pivotal role in bacterial and phage gene expression as well as bacterial virulence. We report here the crystal structures of the bacteriophage T4Dam DNA adenine methyltransferase (MTase) in a binary complex with the methyl-donor product S-adenosyl-L-homocysteine (AdoHcy) and in a ternary complex with a synthetic 12-bp DNA duplex and AdoHcy. T4Dam contains two domains: a seven-stranded catalytic domain that harbors the binding site for AdoHcy and a DNA binding domain consisting of a five-helix bundle and a beta-hairpin that is conserved in the family of GATC-related MTase orthologs. Unexpectedly, the sequence-specific T4Dam bound to DNA in a nonspecific mode that contained two Dam monomers per synthetic duplex, even though the DNA contains a single GATC site. The ternary structure provides a rare snapshot of an enzyme poised for linear diffusion along the DNA.
Organizational Affiliation:
Department of Biochemistry, Emory University School of Medicine, 1510 Clifton Road, Atlanta, Georgia 30322, USA.
