190d

</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=190d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=190d OCA], [https://pdbe.org/190d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=190d RCSB], [https://www.ebi.ac.uk/pdbsum/190d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=190d ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

The crystal structure of d(C4) solved at 2.3-A resolution reveals a four-stranded molecule composed of two interdigitated or intercalated duplexes. The duplexes are held together by hemiprotonated cytosine-cytosine base pairs and are parallel stranded, but the two duplexes point in opposite directions. The molecule has a slow right-handed twist of 12.4 degrees between covalently linked cytosine base pairs, and the base stacking distance is 3.1 A. This is in general agreement with the NMR studies. A biological role for DNA in this conformation is suggested.

Crystal structure of a four-stranded intercalated DNA: d(C4).,Chen L, Cai L, Zhang X, Rich A Biochemistry. 1994 Nov 22;33(46):13540-6. PMID:7947764<ref>PMID:7947764</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

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