Abstract:
:Guanine rich DNA sequences of regulatory genomic regions form secondary structures known as G-quadruplexes usually stabilized by tetrads of Hoogsteen hydrogen bonded guanines. The in vivo existence of G-quadruplexes ascertains their biological roles. Human telomeric repeats are the most studied G-rich sequences. The four repeat Giardia telomeric sequence (TAGGG)4 differs from its human counterpart (TTAGGG)4, by deletion of one T at the G-tract intervening site of each repeat. We show here that whilst the two repeat Giardia telomeric sequence (TAGGG)2 forms parallel and antiparallel quadruplexes with tetramolecular topology exclusively, the four repeat version (TAGGG)4 forms a tetramolecular (antiparallel) and unimolecular (parallel) quadruplexes in Na+. The tetramolecular (antiparallel) G-quadruplex formed by four repeats of Giardia telomeric sequence is stabilized by the additional Watson-Crick bonding between its intervening TA bases aligned in antiparallel fashion. Four stranded antiparallel quadruplex for four repeats of any telomeric sequence have not been characterized till date. We hypothesize that telomeric association in antiparallel fashion, (via G-overhangs to form tetramolecular quadruplex) could be a biologically relevant molecular event. Further, coexistence of Hoogsteen as well as Watson-Crick base pairing might give insight for recognition of conformationally diverse DNA structures by ligands. Communicated by Ramaswamy H. Sarma.
journal_name
J Biomol Struct Dynjournal_title
Journal of biomolecular structure & dynamicsauthors
Bansal A,Kukreti Sdoi
10.1080/07391102.2019.1623074subject
Has Abstractpub_date
2020-04-01 00:00:00pages
1975-1983issue
7eissn
0739-1102issn
1538-0254journal_volume
38pub_type
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