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1nr8

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{{STRUCTURE_1nr8| PDB=1nr8 | SCENE= }}
{{STRUCTURE_1nr8| PDB=1nr8 | SCENE= }}
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'''The crystal structure of a D-Lysine-based chiral PNA-DNA duplex'''
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===The crystal structure of a D-Lysine-based chiral PNA-DNA duplex===
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==Overview==
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Peptide nucleic acids (PNAs) are oligonucleotide analogues in which the sugar-phosphate backbone has been replaced by a pseudopeptide skeleton. They bind DNA and RNA with high specificity and selectivity, leading to PNA-RNA and PNA-DNA hybrids more stable than the corresponding nucleic acid complexes. The binding affinity and selectivity of PNAs for nucleic acids can be modified by the introduction of stereogenic centers (such as D-Lys-based units) into the PNA backbone. To investigate the structural features of chiral PNAs, the structure of a PNA decamer containing three D-Lys-based monomers (namely H-GpnTpnApnGpnAdlTdlCdlApnCpnTpn-NH2, in which pn represents a pseudopeptide link and dl represents a D-Lys analogue) hybridized with its complementary antiparallel DNA has been solved at a 1.66-A resolution by means of a single-wavelength anomalous diffraction experiment on a brominated derivative. The D-Lys-based chiral PNA-DNA (LPD) heteroduplex adopts the so-called P-helix conformation. From the substantial similarity between the PNA conformation in LPD and the conformations observed in other PNA structures, it can be concluded that PNAs possess intrinsic conformational preferences for the P-helix, and that their flexibility is rather restricted. The conformational rigidity of PNAs is enhanced by the presence of the chiral centers, limiting the ability of PNA strands to adopt other conformations and, ultimately, increasing the selectivity in molecular recognition.
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(as it appears on PubMed at http://www.pubmed.gov), where 14512516 is the PubMed ID number.
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{{ABSTRACT_PUBMED_14512516}}
==About this Structure==
==About this Structure==
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[[Category: Double stranded helix]]
[[Category: Double stranded helix]]
[[Category: P-form]]
[[Category: P-form]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:53:11 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 11:37:40 2008''

Revision as of 08:37, 28 July 2008

Image:1nr8.png

Template:STRUCTURE 1nr8

The crystal structure of a D-Lysine-based chiral PNA-DNA duplex

Template:ABSTRACT PUBMED 14512516

About this Structure

Full crystallographic information is available from OCA.

Reference

Insights into peptide nucleic acid (PNA) structural features: the crystal structure of a D-lysine-based chiral PNA-DNA duplex., Menchise V, De Simone G, Tedeschi T, Corradini R, Sforza S, Marchelli R, Capasso D, Saviano M, Pedone C, Proc Natl Acad Sci U S A. 2003 Oct 14;100(21):12021-6. Epub 2003 Sep 25. PMID:14512516

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