详细记录  
题名:Crystal structure and mechanistic determinants of SARS coronavirus nonstructural protein 15 define an endoribonuclease family.
作者:Ricagno S, Egloff MP, Ulferts R, Coutard B, Nurizzo D, Campanacci V, Cambillau C, Ziebuhr J, Canard B.
来源:Proc Natl Acad Sci U S A. 2006 Aug 8;103(32):11892-7. Epub 2006 Aug 1. PMID: 16882730 [PubMed - in process]
URL :http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=16882730&query_hl=49&itool=pubmed_DocSum
日期:060930
摘要:Case 925, Ecole d`Ingenieurs de Luminy, Architecture et Fonction des Macromolecules Biologiques, Unite Mixte de Recherche 6098, Centre National de la Recherche Scientifique and Universites d`Aix-Marseille I et II, 13288 Marseille Cedex 9, France.

The approximately 30-kb coronavirus (+)RNA genome is replicated and transcribed by a membrane-bound replicase complex made up of 16 viral nonstructural proteins (nsp) with multiple enzymatic activities. The complex includes an RNA endonuclease, NendoU, that is conserved among nidoviruses but no other RNA virus, making it a genetic marker of this virus order. NendoU (nsp15) is a Mn(2+)-dependent, uridylate-specific enzyme, which leaves 2`-3`-cyclic phosphates 5` to the cleaved bond. Neither biochemical nor sequence homology criteria allow a classification of nsp15 into existing endonuclease families. Here, we report the crystal structure of the severe acute respiratory syndrome coronavirus nsp15 at 2.6-A resolution. Nsp15 exhibits a unique fold and assembles into a toric hexamer with six potentially active, peripheric catalytic sites. The structure and the spatial arrangement of the catalytic residues into an RNase A-like active site define a separate endonuclease family, endoU, and represent another spectacular example of convergent evolution toward an enzymatic function that is critically involved in the coronavirus replication cycle.

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