1wtd
From Proteopedia
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'''Crystal structure of type II restrcition endonuclease, EcoO109I DNA-free form''' | '''Crystal structure of type II restrcition endonuclease, EcoO109I DNA-free form''' | ||
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[[Category: Shichijo, N.]] | [[Category: Shichijo, N.]] | ||
[[Category: Shimizu, T.]] | [[Category: Shimizu, T.]] | ||
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| - | [[Category: | + | [[Category: Restriction endonuclease]] |
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Revision as of 11:06, 3 May 2008
Crystal structure of type II restrcition endonuclease, EcoO109I DNA-free form
Overview
EcoO109I is a type II restriction endonuclease that recognizes the DNA sequence of RGGNCCY. Here we describe the crystal structures of EcoO109I and its complex with DNA. A comparison of the two structures shows that the catalytic domain moves drastically to capture the DNA. One metal ion and two water molecules are observed near the active site of the DNA complex. The metal ion is a Lewis acid that stabilizes the pentavalent phosphorus atom in the transition state. One water molecule, activated by Lys-126, attacks the phosphorus atom in an S(N)2 mechanism, whereas the other water interacts with the 3'-leaving oxygen to donate a proton to the oxygen. EcoO109I is similar to EcoRI family enzymes in terms of its DNA cleavage pattern and folding topology of the common motif in the catalytic domain, but it differs in the manner of DNA recognition. Our findings propose a novel classification of the type II restriction endonucleases and lead to the suggestion that EcoO109I represents a new subclass of the EcoRI family.
About this Structure
1WTD is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Crystal structures of type II restriction endonuclease EcoO109I and its complex with cognate DNA., Hashimoto H, Shimizu T, Imasaki T, Kato M, Shichijo N, Kita K, Sato M, J Biol Chem. 2005 Feb 18;280(7):5605-10. Epub 2004 Dec 7. PMID:15590682 Page seeded by OCA on Sat May 3 14:06:53 2008
