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1996-02-27
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Document 0316
DOCN M9630316
TI Single strand targeted triplex formation: targeting purine-pyrimidine
mixed sequences using abasic linkers.
DT 9603
AU Kandimalla ER; Manning AN; Venkataraman G; Sasisekharan V; Agrawal S;
Hybridon, Inc., Worcester, MA 01605, USA.
SO Nucleic Acids Res. 1995 Nov 11;23(21):4510-7. Unique Identifier :
AIDSLINE MED/96091203
AB Foldback triplex-forming oligonucleotides (FTFOs) that contain an abasic
linker, [2-(4-aminobutyr-1-yl)-1,3-propanediol] (APD linker), in the
Hoogsteen domain against pyrimidine bases of a C:G and a T:A base pair
were studied for their relative stability and sequence specificity of
triplex formation. In general, the APD linker has less destabilizing
effect against a C:G base pair than a T:A base pair. Incorporation of
three APD linker moieties resulted in decreased binding to the target,
which was comparable to results observed with three imperfectly matched
natural base triplets. The APD linker incorporation did not result in
the loss of sequence specificity of FTFOs, unlike in the case of normal
triplex-forming oligonucleotides (TFOs). The introduction of a
positively charged abasic linker, however, resulted in decreased
stability of the triplex, because of loss of hydrogen bonding and
stacking interactions in the major groove. The results of a molecular
modeling study show that APD linker can be readily incorporated without
any change in the conformation of the natural sugar-phosphate backbone
conserving overall triple helix geometry. Further, the modeling study
suggests a hydrogen bond formation between the amino group of linker and
N4 of cytosine mediated by a solvent molecule (water) in the floor of
the base triplet in addition to a contribution from the positive charge
on the APD linker amino group. Either a direct or water-mediated
hydrogen bond between the amino group of the APD linker and the O4 of
thymine is unlikely when the linker is placed against a T:A base pair.
DE Base Composition Base Sequence Butylamines/CHEMISTRY Comparative
Study Computer Simulation *Genes, gag HIV-1/*GENETICS Models,
Molecular Molecular Sequence Data *Nucleic Acid Conformation Nucleic
Acid Denaturation Nucleic Acid Hybridization
Oligodeoxyribonucleotides/*CHEMISTRY Propanediols/CHEMISTRY RNA,
Messenger/CHEMISTRY RNA, Viral/*CHEMISTRY Spectrophotometry,
Ultraviolet Structure-Activity Relationship JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).