title: NMR study of xenotropic murine leukemia virus-related virus protease in a complex with amprenavir.
abstract: Xenotropic murine leukemia virus-related virus (XMRV) is a virus created through recombination of two murine leukemia proviruses under artificial conditions during the passage of human prostate cancer cells in athymic nude mice. The homodimeric protease (PR) of XMRV plays a critical role in the production of functional viral proteins and is a prerequisite for viral replication. We synthesized XMRV PR using the wheat germ cell-free expression system and carried out structural analysis of XMRV PR in a complex with an inhibitor, amprenavir (APV), by means of NMR. Five different combinatorially (15)N-labeled samples were prepared and backbone resonance assignments were made by applying Otting's method, with which the amino acid types of the [(1)H, (15)N] HSQC resonances were automatically identified using the five samples (Wu et al., 2006) [14]. A titration experiment involving APV revealed that one APV molecule binds to one XMRV PR dimer. For many residues, two distinct resonances were observed, which is thought to be due to the structural heterogeneity between the two protomers in the APV:XMRV PR=1:2 complex. PR residues at the interface with APV have been identified on the basis of chemical shift perturbation and identification of the intermolecular NOEs by means of filtered NOE experiments. Interestingly, chemical shift heterogeneity between the two protomers of XMRV PR has been observed not only at the interface with APV but also in regions apart from the interface. This indicates that the structural heterogeneity induced by the asymmetry of the binding of APV to the XMRV PR dimer is transmitted to distant regions. This is in contrast to the case of the APV:HIV-1 PR complex, in which the structural heterogeneity is only localized at the interface. Long-range transmission of the structural change identified for the XMRV PR complex might be utilized for the discovery of a new type of drug.
authors: Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
authors: Ayako
authors: A
authors: Furukawa
authors: Hideyasu
authors: H
authors: Okamura
authors: Ryo
authors: R
authors: Morishita
authors: Satoko
authors: S
authors: Matsunaga
authors: Naohiro
authors: N
authors: Kobayashi
authors: Takahisa
authors: T
authors: Ikegami
authors: Tsutomu
authors: T
authors: Kodaki
authors: Akifumi
authors: A
authors: Takaori-Kondo
authors: Akihide
authors: A
authors: Ryo
authors: Takashi
authors: T
authors: Nagata
authors: Masato
authors: M
authors: Katahira
mesh_terms: D002219:Carbamates / Q000737:chemistry; D055808:Drug Discovery; D005663:Furans; D017320:HIV Protease Inhibitors / Q000737:chemistry; D015497:HIV-1 / Q000737:chemistry / Q000201:enzymology; D019906:Nuclear Magnetic Resonance, Biomolecular; D010447:Peptide Hydrolases / Q000737:chemistry*; D017433:Protein Structure, Secondary; D013449:Sulfonamides / Q000737:chemistry; D017361:Viral Nonstructural Proteins / Q000737:chemistry*; D058008:Xenotropic murine leukemia virus-related virus / Q000201:enzymology*
chemical_list: D002219:Carbamates; D005663:Furans; D017320:HIV Protease Inhibitors; D013449:Sulfonamides; D017361:Viral Nonstructural Proteins; C095108:amprenavir; D010447:Peptide Hydrolases