Abstract:
:Oligonucleotides 5'-d(CT)5-L-d(AG)5-L-d(GA)5-3' and 5'-d(GA)5-L-d(TC)5-L-d(GA)5-3' [L = pO(CH2CH2O)3p] were studied by thermal denaturation, chemical modification and binding of fluorescent dyes. Both oligonucleotides are shown to fold back on itself twice forming at pH 7 a sufficiently stable triplex ether with antiparallel-oriented oligopurine strands (the first compound) or parallel-oriented oligopurine strands (the second compounds). The parallel triplex is significantly less stable than the antiparallel one. On the basis of conformational modeling, possible types of base tripling in the triplets are proposed. Thus our data provide the first convincingly evidence for the existence of a purine-pyrimidine-purine triplex with parallel orientation of identical strands.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Shchyolkina AK,Borisova OF,Minyat EE,Timofeev EN,Il'icheva IA,Khomyakova EB,Florentiev VLdoi
10.1016/0014-5793(95)00519-fsubject
Has Abstractpub_date
1995-06-19 00:00:00pages
81-4issue
1eissn
0014-5793issn
1873-3468pii
0014-5793(95)00519-Fjournal_volume
367pub_type
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