SL2 RNA stem loop is the major 5' splice donor site. Located in the
Psi-RNA packaging signal, SL2 is also involved in nucleocapsid protein
mediated RNA packaging.

NMR structure of stem-loop SL2 of the HIV-1 psi RNA packaging signal reveals a novel A-U-A base-triple platform.

gag-pol polyprotein [Human immunodeficiency virus 1]

Gag-Pol fusion polyprotein [Human immunodeficiency virus 1]

Gag polyprotein [Human immunodeficiency virus 1]

Gag-Pol fusion protein [Human immunodeficiency virus 1]

GAG polyprotein precursor [Human immunodeficiency virus type 1]

gag protein [Human immunodeficiency virus type 1]

Gag polyprotein (Pr55Gag) [Contains: Matrix protein p17 (MA); Capsid protein p24 (CA); Spacer peptide p2; Nucleocapsid protein p7 (NC); Spacer peptide p1; p6-gag]

Gag-Pol polyprotein (Pr160Gag-Pol) [Contains: Matrix protein p17 (MA); Capsid protein p24 (CA); Spacer peptide p2; Nucleocapsid protein p7 (NC); Transframe peptide (TF); p6-pol (p6*); Protease (Retropepsin) (PR); Reverse transcriptase/ribonuclease H (p66 RT); p51 RT; p15; Integrase (IN)]

NMR Structure of Stem-loop SL2 of the HIV-1 Psi RNA Packaging Signal Reveals a
Novel A-U-A Base-triple Platform

Structure refinement and energy minimization