3MTV
The Crystal Structure of the PRRSV Nonstructural Protein Nsp1
Summary for 3MTV
| Entry DOI | 10.2210/pdb3mtv/pdb |
| Descriptor | Papain-like cysteine protease (2 entities in total) |
| Functional Keywords | prrsv, nsp1, nuclease, papain-like cysteine protease, hydrolase |
| Biological source | Porcine reproductive and respiratory syndrome virus (PRRSV) |
| Total number of polymer chains | 1 |
| Total formula weight | 23093.43 |
| Authors | |
| Primary citation | Xue, F.,Sun, Y.N.,Yan, L.M.,Zhao, C.,Chen, J.,Bartlam, M.,Li, X.M.,Lou, Z.Y.,Rao, Z.H. The crystal structure of porcine reproductive and respiratory syndrome virus nonstructural protein Nsp1beta reveals a novel metal-dependent nuclease J.Virol., 84:6461-6471, 2010 Cited by PubMed Abstract: Porcine reproductive and respiratory syndrome virus (PRRSV), a member of the Arteriviridae family of Nidovirales, is the causative agent of porcine reproductive and respiratory syndrome, which results in enormous economic losses in the swine industry. As the second protein encoded by the PRRSV genome, nsp1beta cleaves itself from the downstream nsp2 protein via a C-terminal papain-like cysteine protease (PCP) domain. Although nsp1beta is known to be involved in virulence, its precise role in the process of viral infection remains unclear. In this work, we describe the homodimeric crystal structure of PRRSV nsp1beta in its natural, self-processed form. We show that the architecture of its N-terminal domain (NTD) adopts a fold closely resembling that of several known nucleases and has intrinsic nuclease activity that is strongly activated by manganese ions in vitro. Key features, however, distinguish nsp1beta from characterized nucleases, including the C-terminal PCP domain (which is responsible for the self-release of nsp1beta from nsp2), a linker domain (LKD) that connects the NTD and the PCP domain, and a C-terminal extension (CTE) that binds to and is stabilized by the putative substrate binding site of the PCPbeta domain. Combined with the reported nuclear localization of this protein, these results shed light on the self-processing mode and precise biological function of nsp1beta and thus offer a multitarget template for future drug discovery. PubMed: 20410261DOI: 10.1128/JVI.00301-10 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.8 Å) |
Structure validation
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