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| == Function == | | == Function == |
| [https://www.uniprot.org/uniprot/Q57253_SYNY3 Q57253_SYNY3] | | [https://www.uniprot.org/uniprot/Q57253_SYNY3 Q57253_SYNY3] |
| <div style="background-color:#fffaf0;">
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| == Publication Abstract from PubMed ==
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| The homing endonuclease I-Ssp6803I causes the insertion of a group I intron into a bacterial tRNA gene-the only example of an invasive mobile intron within a bacterial genome. Using a computational fold prediction, mutagenic screen and crystal structure determination, we demonstrate that this protein is a tetrameric PD-(D/E)-XK endonuclease - a fold normally used to protect a bacterial genome from invading DNA through the action of restriction endonucleases. I-Ssp6803I uses its tetrameric assembly to promote recognition of a single long target site, whereas restriction endonuclease tetramers facilitate cooperative binding and cleavage of two short sites. The limited use of the PD-(D/E)-XK nucleases by mobile introns stands in contrast to their frequent use of LAGLIDADG and HNH endonucleases - which in turn, are rarely incorporated into restriction/modification systems.
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| The restriction fold turns to the dark side: a bacterial homing endonuclease with a PD-(D/E)-XK motif.,Zhao L, Bonocora RP, Shub DA, Stoddard BL EMBO J. 2007 May 2;26(9):2432-42. Epub 2007 Apr 5. PMID:17410205<ref>PMID:17410205</ref>
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| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| </div>
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| <div class="pdbe-citations 2ost" style="background-color:#fffaf0;"></div>
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| == References ==
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| <references/>
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| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |
