2N1Q image
Deposition Date 2015-04-15
Release Date 2015-05-27
Last Version Date 2024-05-15
Entry Detail
PDB ID:
2N1Q
Keywords:
Title:
HIV-1 Core Packaging Signal
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Conformers Calculated:
960
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polyribonucleotide
Molecule:RNA_(155-MER)
Chain IDs:A
Chain Length:155
Number of Molecules:1
Biological Source:Human immunodeficiency virus 1
Ligand Molecules
Primary Citation
RNA structure. Structure of the HIV-1 RNA packaging signal.
Science 348 917 921 (2015)
PMID: 25999508 DOI: 10.1126/science.aaa9266

Abstact

The 5' leader of the HIV-1 genome contains conserved elements that direct selective packaging of the unspliced, dimeric viral RNA into assembling particles. By using a (2)H-edited nuclear magnetic resonance (NMR) approach, we determined the structure of a 155-nucleotide region of the leader that is independently capable of directing packaging (core encapsidation signal; Ψ(CES)). The RNA adopts an unexpected tandem three-way junction structure, in which residues of the major splice donor and translation initiation sites are sequestered by long-range base pairing and guanosines essential for both packaging and high-affinity binding to the cognate Gag protein are exposed in helical junctions. The structure reveals how translation is attenuated, Gag binding promoted, and unspliced dimeric genomes selected, by the RNA conformer that directs packaging.

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Primary Citation of related structures