Structure of the Antiviral Assembly Inhibitor CAP-1 Complex with the HIV-1 CA Protein
The CA domain of the human immunodeficiency virus type 1 (HIV-1) Gag polyprotein plays critical roles in both the early and late phases of viral replication and is therefore an attractive antiviral target. Compounds with antiviral activity were recently identified that bind to the N-terminal domain of CA (CA{sup N}) and inhibit capsid assembly during viral maturation. We have determined the structure of the complex between CA{sup N} and the antiviral assembly inhibitor N-(3-chloro-4-methylphenyl)-N'-{l_brace}2-[({l_brace}5-[(dimethylamino)-methyl]-2-furyl{r_brace}-methyl)-sulfanyl]ethyl{r_brace}-urea (CAP-1) using a combination of NMR spectroscopy and X-ray crystallography. The protein undergoes a remarkable conformational change upon CAP-1 binding, in which Phe32 is displaced from its buried position in the protein core to open a deep hydrophobic cavity that serves as the ligand binding site. The aromatic ring of CAP-1 inserts into the cavity, with the urea NH groups forming hydrogen bonds with the backbone oxygen of Val59 and the dimethylamonium group interacting with the side-chains of Glu28 and Glu29. Elements that could be exploited to improve binding affinity are apparent in the structure. The displacement of Phe32 by CAP-1 appears to be facilitated by a strained main-chain conformation, which suggests a potential role for a Phe32 conformational switch during normal capsid assembly.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 930045
- Report Number(s):
- BNL-80670-2008-JA; JMOBAK; TRN: US200822%%1277
- Journal Information:
- Journal of Molecular Biology, Vol. 373, Issue 2; ISSN 0022-2836
- Country of Publication:
- United States
- Language:
- English
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