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==FORMATION OF AN AMINO ACID BINDING POCKET THROUGH ADAPTIVE ZIPPERING-UP OF A LARGE DNA HAIRPIN LOOP, NMR, 9 STRUCTURES==
<StructureSection load='2arg' size='340' side='right'caption='[[2arg]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2arg]] is a 1 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ARG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ARG FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AAR:ARGININEAMIDE'>AAR</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=2arg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2arg OCA], [https://pdbe.org/2arg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2arg RCSB], [https://www.ebi.ac.uk/pdbsum/2arg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2arg ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
BACKGROUND: In vitro selection has identified DNA aptamers that target cofactors, amino acids, peptides and proteins. Structure determination of such ligand-DNA aptamer complexes should elucidate the details of adaptive DNA structural transitions, binding-pocket architectures and ligand recognition. We have determined the solution structure of the complex of a DNA aptamer containing a guanine-rich 18-residue hairpin loop that binds L-argininamide with approximately 100 microM affinity. RESULTS: The DNA aptamer generates its L-argininamide-binding pocket by adaptive zippering up the 18-residue loop through formation of Watson-Crick pairs, mismatch pairs and base triples, while maximizing stacking interactions. Three of the four base triples involve minor-groove recognition through sheared G.A mismatch formation. The unique fold is also achieved through positioning of an adenine residue deep within the minor groove and through nestling of a smaller loop within the larger loop on complex formation. The accessibility to the unique L-argininamide-binding pocket is restricted by a base pair that bridges across one side of the major-groove-binding site. The guanidinium group of the bound L-argininamide aligns through intermolecular hydrogen-bond formation with the base edges of nonadjacent guanine and cytosine residues while being sandwiched between the planes of nonadjacent guanine residues. CONCLUSIONS: The available structures of L-arginine/L-argininamide bound to their DNA and RNA targets define the common principles and patterns associated with molecular recognition, as well as the diversity of intermolecular hydrogen-bonding alignments associated with the distinct binding pockets.

Formation of an amino-acid-binding pocket through adaptive zippering-up of a large DNA hairpin loop.,Lin CH, Wang W, Jones RA, Patel DJ Chem Biol. 1998 Oct;5(10):555-72. PMID:9818148<ref>PMID:9818148</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2arg" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Jones RA]]
[[Category: Lin CH]]
[[Category: Patel DJ]]
[[Category: Wang W]]