2IVH

Crystal structure of the nuclease domain of ColE7 (H545Q mutant) in complex with an 18-bp duplex DNA

Summary for 2IVH

• Entry DOI: 10.2210/pdb2ivh/pdb
• Related: 1M08 1MZ8 1PT3 1UJZ 1ZNS 1ZNV 2AXC 7CEI
• Descriptor: COLCIN-E7, 5'-D(*GP*GP*AP*AP*TP*TP*CP*GP*AP*TP *CP*GP*AP*AP*TP*TP*CP*C)-3', ZINC ION, ... (4 entities in total)
• Functional Keywords: bacteriocin, endonuclease, antimicrobial, metal-binding, hydrolase-dna complex, zinc, plasmid, nuclease, hydrolase, antibiotic
• Biological source: ESCHERICHIA COLI; More
• Total number of polymer chains: 3
• Total formula weight: 25748.20

Authors

Wang, Y.T.,Yang, W.J.,Li, C.L.,Doudeva, L.G.,Yuan, H.S. (deposition date: 2006-06-13, release date: 2007-01-02, Last modification date: 2023-12-13)

Primary citation

Wang, Y.T.,Yang, W.J.,Li, C.L.,Doudeva, L.G.,Yuan, H.S.
Structural Basis for Sequence-Dependent DNA Cleavage by Nonspecific Endonucleases.
Nucleic Acids Res., 35:584-, 2007

PubMed Abstract: Nonspecific endonucleases hydrolyze DNA without sequence specificity but with sequence preference, however the structural basis for cleavage preference remains elusive. We show here that the nonspecific endonuclease ColE7 cleaves DNA with a preference for making nicks after (at 3'O-side) thymine bases but the periplasmic nuclease Vvn cleaves DNA more evenly with little sequence preference. The crystal structure of the 'preferred complex' of the nuclease domain of ColE7 bound to an 18 bp DNA with a thymine before the scissile phosphate had a more distorted DNA phosphate backbone than the backbones in the non-preferred complexes, so that the scissile phosphate was compositionally closer to the endonuclease active site resulting in more efficient DNA cleavage. On the other hand, in the crystal structure of Vvn in complex with a 16 bp DNA, the DNA phosphate backbone was similar and not distorted in comparison with that of a previously reported complex of Vvn with a different DNA sequence. Taken together these results suggest a general structural basis for the sequence-dependent DNA cleavage catalyzed by nonspecific endonucleases, indicating that nonspecific nucleases could induce DNA to deform to distinctive levels depending on the local sequence leading to different cleavage rates along the DNA chain.

PubMed: 17175542
DOI: 10.1093/NAR/GKL621

Experimental method

X-RAY DIFFRACTION (2.8 Å)