DE RACHE, Aurore; MARQUEVIELLE, Julien; BOUAZIZ, Serge; VIALET, Brune; ANDREOLA, Marie-Line; MERGNY, Jean-Louis; AMRANE, Samir

doi:10.1016/j.jmb.2023.168359

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DE RACHE, Aurore
Régulations Naturelles et Artificielles [ARNA]

MARQUEVIELLE, Julien

Régulations Naturelles et Artificielles [ARNA]

BOUAZIZ, Serge

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Journal of Molecular Biology. 2024-01-15, vol. 436, n° 2, p. 168359

Résumé en anglais

Nucleic acid sequences containing guanine tracts are able to form non-canonical DNA or RNA structures known as G-quadruplexes (or G4s). These structures, based on the stacking of G-tetrads, are involved in various biological processes such as gene expression regulation. Here, we investigated a G4 forming sequence, HIVpro2, derived from the HIV-1 promoter. This motif is located 60 nucleotides upstream of the proviral Transcription Starting Site (TSS) and overlaps with two SP1 transcription factor binding sites. Using NMR spectroscopy, we determined that HIVpro2 forms a hybrid type G4 structure with a core that is interrupted by a single nucleotide bulge. An additional reverse-Hoogsteen AT base pair is stacked on top of the tetrad. SP1 transcription factor is known to regulate transcription activity of many genes through the recognition of Guanine-rich duplex motifs. Here, the formation of HIVpro2 G4 may modulate SP1 binding sites architecture by competing with the formation of the canonical duplex structure. Such DNA structural switch potentially participates to the regulation of viral transcription and may also interfere with HIV-1 reactivation or viral latency.< Réduire

Mots clés en anglais

Binding Sites

DNA

G-Quadruplexes

Guanine

HIV-1

Sp1 Transcription Factor

Humans

Gene Expression Regulation

Viral

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Structure of a DNA G-quadruplex that Modulates SP1 Binding Sites Architecture in HIV-1 Promoter.

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