1yfj

T4Dam in Complex with AdoHcy and 15-mer Oligonucleotide Showing Semi-specific and Specific Contact

spinqualitylabelsall models 1yfj, resolution 2.69Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1yfj is a 16 chain structure with sequence from Escherichia virus T4. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.69Å Ligands: CA, CL, SAH Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DMA_BPT4 This methylase recognizes the double-stranded sequence GATC, causes specific methylation on A-2 on both strands. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed DNA methyltransferases methylate target bases within specific nucleotide sequences. Three structures are described for bacteriophage T4 DNA-adenine methyltransferase (T4Dam) in ternary complexes with partially and fully specific DNA and a methyl-donor analog. We also report the effects of substitutions in the related Escherichia coli DNA methyltransferase (EcoDam), altering residues corresponding to those involved in specific interaction with the canonical GATC target sequence in T4Dam. We have identified two types of protein-DNA interactions: discriminatory contacts, which stabilize the transition state and accelerate methylation of the cognate site, and antidiscriminatory contacts, which do not significantly affect methylation of the cognate site but disfavor activity at noncognate sites. These structures illustrate the transition in enzyme-DNA interaction from nonspecific to specific interaction, suggesting that there is a temporal order for formation of specific contacts. Transition from nonspecific to specific DNA interactions along the substrate-recognition pathway of dam methyltransferase.,Horton JR, Liebert K, Hattman S, Jeltsch A, Cheng X Cell. 2005 May 6;121(3):349-61. PMID:15882618 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA adenine methylase

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