Primary Citation of Related Structures: 1AQI, 1AQJ, 2ADM
PubMed Abstract:
The crystal structures of the binary complexes of the DNA methyltransferase M.TaqI with the inhibitor Sinefungin and the reaction product S-adenosyl-L-homocysteine were determined, both at 2.6 A resolution. Structural comparison of these binary complexes with the complex formed by M ...
The crystal structures of the binary complexes of the DNA methyltransferase M.TaqI with the inhibitor Sinefungin and the reaction product S-adenosyl-L-homocysteine were determined, both at 2.6 A resolution. Structural comparison of these binary complexes with the complex formed by M.TaqI and the cofactor S-adenosyl-L-methionine suggests that the key element for molecular recognition of these ligands is the binding of their adenosine part in a pocket, and discrimination between cofactor, reaction product and inhibitor is mediated by different conformations of these molecules; the methionine part of S-adenosyl-L-methionine is located in the binding cleft, whereas the amino acid moieties of Sinefungin and S-adenosyl-L-homocysteine are in a different orientation and interact with the active site amino acid residues 105NPPY108. Dissociation constants for the complexes of M.TaqI with the three ligands were determined spectrofluorometrically. Sinefungin binds more strongly than S-adenosyl-L-homocysteine or S-adenosyl-L-methionine, with KD=0.34 microM, 2.4 microM and 2.0 microM, respectively.
Related Citations:
Universal Catalytic Domain Structure of Adomet-Dependent Methyltransferases Schluckebier, G., O'Gara, M., Saenger, W., Cheng, X. (1995) J Mol Biol 247: 16
A Model for DNA Binding and Enzyme Action Derived from Crystallographic Studies of the TaqI N6-Adenine-Methyltransferase Schluckebier, G., Labahn, J., Granzin, J., Schildkraut, I., Saenger, W. (1995) Gene 157: 131
Three-Dimensional Structure of the Adenine-Specific DNA Methyltransferase M.Taq I in Complex with the Cofactor S-Adenosylmethionine Labahn, J., Granzin, J., Schluckebier, G., Robinson, D.P., Jack, W.E., Schildkraut, I., Saenger, W. (1994) Proc Natl Acad Sci U S A 91: 10957
Organizational Affiliation:
Institut für Kristallographie Freie Universität Berlin, Germany.
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