1ev7

CRYSTAL STRUCTURE OF DNA RESTRICTION ENDONUCLEASE NAEI

spinqualitylabelsall models 1ev7, resolution 2.38Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ev7 is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Activity: Type II site-specific deoxyribonuclease, with EC number 3.1.21.4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [T2N1_NOCAE] Recognizes the double-stranded unmethylated sequence GCCGGC and cleaves after C-3. Publication Abstract from PubMed NAE:I is transformed from DNA endonuclease to DNA topoisomerase and recombinase by a single amino acid substitution. The crystal structure of NAE:I was solved at 2.3 A resolution and shows that NAE:I is a dimeric molecule with two domains per monomer. Each domain contains one potential DNA recognition motif corresponding to either endonuclease or topoisomerase activity. The N-terminal domain core folds like the other type II restriction endonucleases as well as lambda-exonuclease and the DNA repair enzymes MutH and Vsr, implying a common evolutionary origin and catalytic mechanism. The C-terminal domain contains a catabolite activator protein (CAP) motif present in many DNA-binding proteins, including the type IA and type II topoisomerases. Thus, the NAE:I structure implies that DNA processing enzymes evolved from a few common ancestors. NAE:I may be an evolutionary bridge between endonuclease and DNA processing enzymes. Crystal structure of NaeI-an evolutionary bridge between DNA endonuclease and topoisomerase.,Huai Q, Colandene JD, Chen Y, Luo F, Zhao Y, Topal MD, Ke H EMBO J. 2000 Jun 15;19(12):3110-8. PMID:10856254 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Endonuclease

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