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TitleA Strain-Specific Inhibitor of Receptor-Bound HIV-1 Targets a Pocket near the Fusion Peptide.
Journal, issue, pagesCell Rep, Vol. 33, Issue 8, Page 108428, Year 2020
Publish dateNov 24, 2020
AuthorsGabriel Ozorowski / Jonathan L Torres / Diogo Santos-Martins / Stefano Forli / Andrew B Ward /
PubMed AbstractDisruption of viral fusion represents a viable, albeit under-explored, target for HIV therapeutics. Here, while studying the receptor-bound envelope glycoprotein conformation by cryoelectron ...Disruption of viral fusion represents a viable, albeit under-explored, target for HIV therapeutics. Here, while studying the receptor-bound envelope glycoprotein conformation by cryoelectron microscopy (cryo-EM), we identify a pocket near the base of the trimer containing a bound detergent molecule and perform in silico drug screening by using a library of drug-like and commercially available molecules. After down-selection, we solve cryo-EM structures that validate the binding of two small molecule hits in very similar manners to the predicted binding poses, including interactions with aromatic residues within the fusion peptide. One of the molecules demonstrates low micromolar inhibition of the autologous virus by using a very rare phenylalanine in the fusion peptide and stabilizing the surrounding region. This work demonstrates that small molecules can target the fusion process, providing an additional target for anti-HIV therapeutics, and highlights the need to explore how fusion peptide sequence variations affect receptor-mediated conformational states across diverse HIV strains.
External linksCell Rep / PubMed:33238117 / PubMed Central
MethodsEM (single particle)
Resolution3.5 - 4.04 Å
Structure data

EMDB-20150, PDB-6opn:
CD4- and 17-bound HIV-1 Env B41 SOSIP in complex with small molecule GO35
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-20151: C3 symmetry reconstruction of CD4- and 17-bound B41 HIV-1 Env SOSIP in complex with DDM
PDB-6opo: Symmetric model of CD4- and 17-bound B41 HIV-1 Env SOSIP in complex with DDM
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-20152: Asymmetric reconstruction of CD4- and 17-bound B41 HIV-1 Env SOSIP in complex with DDM
PDB-6opp: Asymmetric model of CD4- and 17-bound B41 HIV-1 Env SOSIP in complex with DDM
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-20153: Reconstruction of class 1 of CD4- and 17-bound B41 HIV-1 Env SOSIP incubated with LMNG and small molecule GO27
PDB-6opq: CD4- and 17-bound HIV-1 Env B41 SOSIP frozen with LMNG
Method: EM (single particle) / Resolution: 3.8 Å

EMDB-22048: C3 symmetric reconstruction of CD4- and 17-bound B41 HIV-1 Env SOSIP in complex with small molecule GO52
PDB-6x5b: Symmetric model of CD4- and 17-bound B41 HIV-1 Env SOSIP in complex with small molecule GO52
Method: EM (single particle) / Resolution: 3.6 Å

EMDB-22049: Asymmetric reconstruction of CD4- and 17b-bound B41 HIV-1 Env SOSIP in complex with small molecule GO52
PDB-6x5c: Asymmetric model of CD4-bound B41 HIV-1 Env SOSIP in complex with small molecule GO52
Method: EM (single particle) / Resolution: 4.04 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

ChemComp-N07:
[3'-(5-methyl-1,3,4-oxadiazol-2-yl)[1,1'-biphenyl]-3-yl](piperidin-1-yl)methanone

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

ChemComp-UOV:
N-(4'-methyl[1,1'-biphenyl]-4-yl)-1-oxa-7-azaspiro[3.5]nonane-7-carboxamide

Source
  • human immunodeficiency virus 1
  • homo sapiens (human)
KeywordsVIRAL PROTEIN/Immune System / HIV-1 / Env / CD4 / receptor-bound state / small molecule / fusion inhibitor / VIRAL PROTEIN / VIRAL PROTEIN-Immune System complex / detergent / DDM

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