1ynm | pdb_00001ynm

Crystal structure of restriction endonuclease HinP1I

spinqualitylabelsall models 1ynm, resolution 2.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ynm is a 1 chain structure with sequence from "bacterium_influenzae"_lehmann_and_neumann_1896 "bacterium influenzae" lehmann and neumann 1896. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: hinP1IR ("Bacterium influenzae" Lehmann and Neumann 1896) Activity: Type II site-specific deoxyribonuclease, with EC number 3.1.21.4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed HinP1I, a type II restriction endonuclease, recognizes and cleaves a palindromic tetranucleotide sequence (G/CGC) in double-stranded DNA, producing 2 nt 5' overhanging ends. Here, we report the structure of HinP1I crystallized as one protein monomer in the crystallographic asymmetric unit. HinP1I displays an elongated shape, with a conserved catalytic core domain containing an active-site motif of SDX18QXK and a putative DNA-binding domain. Without significant sequence homology, HinP1I displays striking structural similarity to MspI, an endonuclease that cleaves a similar palindromic DNA sequence (C/CGG) and binds to that sequence crystallographically as a monomer. Almost all the structural elements of MspI can be matched in HinP1I, including both the DNA recognition and catalytic elements. Examining the protein-protein interactions in the crystal lattice, HinP1I could be dimerized through two helices located on the opposite side of the protein to the active site, generating a molecule with two active sites and two DNA-binding surfaces opposite one another on the outer surfaces of the dimer. A possible functional link between this unusual dimerization mode and the tetrameric restriction enzymes is discussed. Structure of HinP1I endonuclease reveals a striking similarity to the monomeric restriction enzyme MspI.,Yang Z, Horton JR, Maunus R, Wilson GG, Roberts RJ, Cheng X Nucleic Acids Res. 2005 Apr 1;33(6):1892-901. Print 2005. PMID:15805123 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Endonuclease

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