View source for 4aag


==Crystal structure of the mutant D75N I-CreI in complex with its wild- type target in presence of Ca at the active site (The four central bases, 2NN region, are composed by GTAC from 5' to 3')==
<StructureSection load='4aag' size='340' side='right'caption='[[4aag]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4aag]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Chlamydomonas_reinhardtii Chlamydomonas reinhardtii] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4AAG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4AAG FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4aag FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4aag OCA], [https://pdbe.org/4aag PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4aag RCSB], [https://www.ebi.ac.uk/pdbsum/4aag PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4aag ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DNE1_CHLRE DNE1_CHLRE] Endonuclease involved in group I intron homing. Recognizes and cleaves a 19-24 bp palindromic DNA site.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Homing endonucleases represent protein scaffolds that provide powerful tools for genome manipulation, as these enzymes possess a very low frequency of DNA cleavage in eukaryotic genomes due to their high specificity. The basis of protein-DNA recognition must be understood to generate tailored enzymes that target the DNA at sites of interest. Protein-DNA interaction engineering of homing endonucleases has demonstrated the potential of these approaches to create new specific instruments to target genes for inactivation or repair. Protein-DNA interface studies have been focused mostly on specific contacts between amino acid side chains and bases to redesign the binding interface. However, it has been shown that 4 bp in the central DNA sequence of the 22-bp substrate of a homing endonuclease (I-CreI), which do not show specific protein-DNA interactions, is not devoid of content information. Here, we analyze the mechanism of target discrimination in this substrate region by the I-CreI protein, determining how it can occur independently of the specific protein-DNA interactions. Our data suggest the important role of indirect readout in this substrate region, opening the possibility for a fully rational search of new target sequences, thus improving the development of redesigned enzymes for therapeutic and biotechnological applications.

Non-specific protein-DNA interactions control I-CreI target binding and cleavage.,Molina R, Redondo P, Stella S, Marenchino M, D'Abramo M, Gervasio FL, Charles Epinat J, Valton J, Grizot S, Duchateau P, Prieto J, Montoya G Nucleic Acids Res. 2012 Apr 11. PMID:22495931<ref>PMID:22495931</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4aag" style="background-color:#fffaf0;"></div>

==See Also==
*[[Endonuclease 3D structures|Endonuclease 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Chlamydomonas reinhardtii]]
[[Category: Large Structures]]
[[Category: Synthetic construct]]
[[Category: D'Abramo M]]
[[Category: Duchateau P]]
[[Category: Epinat JC]]
[[Category: Gervasio F]]
[[Category: Grizot S]]
[[Category: Marenchino M]]
[[Category: Molina R]]
[[Category: Montoya G]]
[[Category: Prieto J]]
[[Category: Redondo P]]
[[Category: Stella S]]
[[Category: Valton J]]