ISDA

Entry Detail

PDB ID:

1PNN

Keywords:

PEPTIDE NUCLEIC ACID/DNA

Title:

PEPTIDE NUCLEIC ACID (PNA) COMPLEXED WITH DNA

Biological Source:

Source Organism:

PDB Version:

Deposition Date:

1995-10-13

Release Date:

1996-03-08

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.50 Å

R-Value Free:

0.23

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

P 65 2 2

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Macromolecular Entities

Polymer Type:polydeoxyribonucleotide
Description:PNA (NH2-P(*C*T*C*T*T*C*T*T*C-HIS-GLY-SER-SER-GLY-HIS-C*T*T*C*T*T*C*T*C)-COOH)
Chain IDs:A, C
Chain Length:24
Number of Molecules:2
Biological Source:

Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(GP*AP*AP*GP*AP*AP*GP*AP*G)-3')
Chain IDs:B, D
Chain Length:9
Number of Molecules:2
Biological Source:

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
CPN	A	DC	?
TPN	A	DT	?

Primary Citation

A Nucleic Acid Triple Helix Formed by a Peptide Nucleic Acid-DNA Complex

Betts, L, Josey, J.A, Veal, J.M, Jordan, S.R, Brown, S.C, Thomson, S.A, Veal, J.M, Davis, D.G.Show

Science 270 1838 1841 (1995)

PMID: 8525381

Abstact

The crystal structure of a nucleic acid triplex reveals a helix, designated P-form, that differs from previously reported nucleic acid structures. The triplex consists of one polypurine DNA strand complexed to a polypyrimidine hairpin peptide nucleic acid (PNA) and was successfully designed to promote Watson-Crick and Hoogsteen base pairing. The P-form helix is underwound, with a base tilt similar to B-form DNA. The bases are displaced from the helix axis even more than in A-form DNA. Hydrogen bonds between the DNA backbone and the Hoogsteen PNA backbone explain the observation that polypyrimidine PNA sequences form highly stable 2:1 PNA-DNA complexes. This structure expands the number of known stable helical forms that nucleic acids can adopt.

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Primary Citation of related structures