5OI8

Dissociation of biochemical and antiretroviral activities of Integrase-LEDGF Allosteric Inhibitors revealed by resistance of A125 polymorphic HIV-1

Summary for 5OI8

• Entry DOI: 10.2210/pdb5oi8/pdb
• Related: 4LH4
• Descriptor: Pol protein, MAGNESIUM ION, (2~{S})-2-[4-(4,4-dimethylcyclohexen-1-yl)-2-methyl-5-pyridin-4-yl-thiophen-3-yl]-2-[(2-methylpropan-2-yl)oxy]ethanoic acid, ... (5 entities in total)
• Functional Keywords: hiv-1, integrase, catalytic core domain, viral protein
• Biological source: Human immunodeficiency virus 1
• Total number of polymer chains: 1
• Total formula weight: 20613.53

Authors

Ruff, M.,Benarous, R. (deposition date: 2017-07-18, release date: 2018-03-07, Last modification date: 2024-10-23)

Primary citation

Bonnard, D.,Le Rouzic, E.,Eiler, S.,Amadori, C.,Orlov, I.,Bruneau, J.M.,Brias, J.,Barbion, J.,Chevreuil, F.,Spehner, D.,Chasset, S.,Ledoussal, B.,Moreau, F.,Saib, A.,Klaholz, B.P.,Emiliani, S.,Ruff, M.,Zamborlini, A.,Benarous, R.
Structure-function analyses unravel distinct effects of allosteric inhibitors of HIV-1 integrase on viral maturation and integration.
J. Biol. Chem., 293:6172-6186, 2018

PubMed Abstract: Recently, a new class of HIV-1 integrase (IN) inhibitors with a dual mode of action, called IN-LEDGF/p75 allosteric inhibitors (INLAIs), was described. Designed to interfere with the IN-LEDGF/p75 interaction during viral integration, unexpectedly, their major impact was on virus maturation. This activity has been linked to induction of aberrant IN multimerization, whereas inhibition of the IN-LEDGF/p75 interaction accounts for weaker antiretroviral effect at integration. Because these dual activities result from INLAI binding to IN at a single binding site, we expected that these activities co-evolved together, driven by the affinity for IN. Using an original INLAI, MUT-A, and its activity on an Ala-125 (A125) IN variant, we found that these two activities on A125-IN can be fully dissociated: MUT-A-induced IN multimerization and the formation of eccentric condensates in viral particles, which are responsible for inhibition of virus maturation, were lost, whereas inhibition of the IN-LEDGF/p75 interaction and consequently integration was fully retained. Hence, the mere binding of INLAI to A125 IN is insufficient to promote the conformational changes of IN required for aberrant multimerization. By analyzing the X-ray structures of MUT-A bound to the IN catalytic core domain (CCD) with or without the Ala-125 polymorphism, we discovered that the loss of IN multimerization is due to stabilization of the A125-IN variant CCD dimer, highlighting the importance of the CCD dimerization energy for IN multimerization. Our study reveals that affinity for the LEDGF/p75-binding pocket is not sufficient to induce INLAI-dependent IN multimerization and the associated inhibition of viral maturation.

PubMed: 29507092
DOI: 10.1074/jbc.M117.816793

Experimental method

X-RAY DIFFRACTION (2.35 Å)