2n4y

Structure and possible function of a G-quadruplex in the long terminal repeat of the proviral HIV-1 genome

spinqualitylabelsall models 2n4y Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2n4y is a 1 chain structure with sequence from Synthetic construct. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The long terminal repeat (LTR) of the proviral human immunodeficiency virus (HIV)-1 genome is integral to virus transcription and host cell infection. The guanine-rich U3 region within the LTR promoter, previously shown to form G-quadruplex structures, represents an attractive target to inhibit HIV transcription and replication. In this work, we report the structure of a biologically relevant G-quadruplex within the LTR promoter region of HIV-1. The guanine-rich sequence designated LTR-IV forms a well-defined structure in physiological cationic solution. The nuclear magnetic resonance (NMR) structure of this sequence reveals a parallel-stranded G-quadruplex containing a single-nucleotide thymine bulge, which participates in a conserved stacking interaction with a neighboring single-nucleotide adenine loop. Transcription analysis in a HIV-1 replication competent cell indicates that the LTR-IV region may act as a modulator of G-quadruplex formation in the LTR promoter. Consequently, the LTR-IV G-quadruplex structure presented within this work could represent a valuable target for the design of HIV therapeutics. Structure and possible function of a G-quadruplex in the long terminal repeat of the proviral HIV-1 genome.,De Nicola B, Lech CJ, Heddi B, Regmi S, Frasson I, Perrone R, Richter SN, Phan AT Nucleic Acids Res. 2016 Jun 13. pii: gkw432. PMID:27298260 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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