Abstract
Three evolutionary conserved (G-rich) sites of Alu repeats (PQS2, PQS3, and PQS4) could form in vitro stable inter- and intramolecular G-quadruplexes (GQs). Structures and topologies of these GQs were elucidated using spectral methods. The study of self-association of G-rich Alu fragments performed using a FRET-based method revealed dimeric GQ formation from two distally located sites (PQS2)2, (PQS3)2 or PQS2−PQS3 within one extended single stranded DNA. Using DOSY NMR, AFM microscopy and differential CD spectroscopy it has been demonstrated that oligomer PQS4 (folded into a parallel intramolecular GQ) forms stacks of quadruplexes stabilized by stacking interactions of external G-tetrads. Comparative analysis of the properties of various GQs suggests involvement of two universal general mechanisms of GQ-dependent genomic rearrangements: (i) formation of dimeric GQs from fragments of different molecules; (ii) formation of GQ-GQ-stacks from pre-folded intramolecular parallel GQs from different strands. Thus, association of G-rich Alu motifs with sensitivity to double-strand breaks and rearrangements may be attributed not to structural features of G-rich Alu fragments, but also to their high abundance.
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Original Russian Text © A.M. Varizhuk, A.V. Sekridova, M.V. Tankevich, V.S. Podgorsky, I.P. Smirnov, G.E. Pozmogova, 2017, published in Biomeditsinskaya Khimiya.
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Varizhuk, A.M., Sekridova, A.V., Tankevich, M.V. et al. Conformational polymorphysm of G-rich fragments of DNA Alu-repeats. II. The putative role of G-quadruplex structures in genomic rearrangements. Biochem. Moscow Suppl. Ser. B 11, 146–153 (2017). https://doi.org/10.1134/S1990750817020093
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DOI: https://doi.org/10.1134/S1990750817020093