Four base recognition by triplex-forming oligonucleotides at physiological pH.
Four base recognition by triplex-forming oligonucleotides at physiological pH.
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DOI:
10.1093/nar/gki625
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发表时间:
2005
影响因子:
14.9
通讯作者:
Fox KR
中科院分区:
文献类型:
--
作者:
Rusling DA;Powers VE;Ranasinghe RT;Wang Y;Osborne SD;Brown T;Fox KR
We have achieved recognition of all 4 bp by triple helix formation at physiological pH, using triplex-forming oligonucleotides that contain four different synthetic nucleotides. BAU [2′-aminoethoxy-5-(3-aminoprop-1-ynyl)uridine] recognizes AT base pairs with high affinity, MeP (3-methyl-2 aminopyridine) binds to GC at higher pHs than cytosine, while APP (6-(3-aminopropyl)-7-methyl-3H-pyrrolo[2,3-d]pyrimidin-2(7H)-one) and S [N-(4-(3-acetamidophenyl)thiazol-2-yl-acetamide)] bind to CG and TA base pairs, respectively. Fluorescence melting and DNase I footprinting demonstrate successful triplex formation at a 19mer oligopurine sequence that contains two CG and two TA interruptions. The complexes are pH dependent, but are still stable at pH 7.0. BAU, MeP and APP retain considerable selectivity, and single base pair changes opposite these residues cause a large reduction in affinity. In contrast, S is less selective and tolerates CG pairs as well as TA.
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影响因子:
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通讯作者:
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