5HOT

Structural Basis for Inhibitor-Induced Aggregation of HIV-1 Integrase

Summary for 5HOT

• Entry DOI: 10.2210/pdb5hot/pdb
• Related: 5HRN 5HRP 5HRR 5HRS
• Descriptor: Integrase, (2S)-tert-butoxy[4-(8-fluoro-5-methyl-3,4-dihydro-2H-chromen-6-yl)-2-methyl-1-oxo-1,2-dihydroisoquinolin-3-yl]ethanoic acid (2 entities in total)
• Functional Keywords: integrase, inhibitor complex, nucleic acid binding, dna integration, transferase-inhibitor complex, transferase/inhibitor
• Biological source: Human immunodeficiency virus 1
• Total number of polymer chains: 2
• Total formula weight: 65987.17

Authors

Gupta, K.,Turkki, V.,Sherrill-Mix, S.,Hwang, Y.,Eilers, G.,Taylor, L.,McDanal, C.,Wang, P.,Temelkoff, D.,Nolte, R.,Velthuisen, E.,Jeffrey, J.,Van Duyne, G.D.,Bushman, F.D. (deposition date: 2016-01-19, release date: 2016-12-14, Last modification date: 2023-09-27)

Primary citation

Gupta, K.,Turkki, V.,Sherrill-Mix, S.,Hwang, Y.,Eilers, G.,Taylor, L.,McDanal, C.,Wang, P.,Temelkoff, D.,Nolte, R.T.,Velthuisen, E.,Jeffrey, J.,Van Duyne, G.D.,Bushman, F.D.
Structural Basis for Inhibitor-Induced Aggregation of HIV Integrase.
PLoS Biol., 14:e1002584-e1002584, 2016

PubMed Abstract: The allosteric inhibitors of integrase (termed ALLINIs) interfere with HIV replication by binding to the viral-encoded integrase (IN) protein. Surprisingly, ALLINIs interfere not with DNA integration but with viral particle assembly late during HIV replication. To investigate the ALLINI inhibitory mechanism, we crystallized full-length HIV-1 IN bound to the ALLINI GSK1264 and determined the structure of the complex at 4.4 Å resolution. The structure shows GSK1264 buried between the IN C-terminal domain (CTD) and the catalytic core domain. In the crystal lattice, the interacting domains are contributed by two different dimers so that IN forms an open polymer mediated by inhibitor-bridged contacts; the N-terminal domains do not participate and are structurally disordered. Engineered amino acid substitutions at the inhibitor interface blocked ALLINI-induced multimerization. HIV escape mutants with reduced sensitivity to ALLINIs commonly altered amino acids at or near the inhibitor-bound interface, and these substitutions also diminished IN multimerization. We propose that ALLINIs inhibit particle assembly by stimulating inappropriate polymerization of IN via interactions between the catalytic core domain and the CTD and that understanding the interface involved offers new routes to inhibitor optimization.

PubMed: 27935939
DOI: 10.1371/journal.pbio.1002584

Experimental method

X-RAY DIFFRACTION (4.4 Å)