Abstract：
:A human telomere ends in a single-stranded 3' tail, composed of repeats of T2AG3. G-quadruplexes (GQs) formed from four consecutive repeats have been shown to possess high-structural and mechanical diversity. In principle, a GQ can form from any four repeats that are not necessarily consecutive. To understand the dynamics of GQs with positional multiplicity, we studied five and six repeats human telomeric sequence using a combination of single molecule FRET and optical tweezers. Our results suggest preferential formation of GQs at the 3' end both in K+ and Na+ solutions, with minor populations of 5'-GQ or long-loop GQs. A vectorial folding assay which mimics the directional nature of telomere extension showed that the 3' preference holds even when folding is allowed to begin from the 5' side. In 100 mM K+, the unassociated T2AG3 segment has a streamlining effect in that one or two mechanically distinct species was observed at a single position instead of six or more observed without an unassociated repeat. We did not observe such streamlining effect in 100 mM Na+. Location of GQ and reduction in conformational diversity in the presence of extra repeats have implications in telomerase inhibition, T-loop formation and telomere end protection.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Mitra J,Ha Tdoi
10.1093/nar/gkz906subject
Has Abstractpub_date
2019-12-02 00:00:00pages
11044-11056issue
21eissn
0305-1048issn
1362-4962pii
5588345journal_volume
47pub_type
杂志文章abstract：:Coralyne is a small crescent-shaped molecule known to intercalate duplex and triplex DNA. We report that coralyne can cause the complete and irreversible disproportionation of duplex poly(dT)*poly(dA). That is, coralyne causes the strands of duplex poly(dT)*poly(dA) to repartition into equal molar equivalents of tripl...
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