2gth
From Proteopedia
crystal structure of the wildtype MHV coronavirus non-structural protein nsp15
Structural highlights
FunctionQ9J3E8_9BETC The replicase polyprotein of coronaviruses is a multifunctional protein: it contains the activities necessary for the transcription of negative stranded RNA, leader RNA, subgenomic mRNAs and progeny virion RNA as well as proteinases responsible for the cleavage of the polyprotein into functional products.[ARBA:ARBA00003368] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe unique coronavirus transcription/replication machinery comprised of multiple virus-encoded nonstructural proteins (nsp) plays a vital role during initial and intermediate phases of the viral life cycle. The crystal structure of mouse hepatitis virus strain A59 (MHV-A59) nsp15 is reported at 2.15-A resolution. nsp15 is an XendoU endoribonuclease and is the first one from this family to have its structure unveiled. The MHV-A59 nsp15 monomer structure has a novel protein fold. Two nsp15 trimers form a back-to-back hexamer that is believed to be the functional unit. The structure reveals the catalytic site including the highly conserved residues His262, His277, and Lys317, which is supported by mutagenesis analysis. Gel filtration and enzyme activity assays confirmed that the hexamer is the active form for nsp15 and demonstrate the specificity of nsp15 for uridylate. The high sequence conservation of nsp15 in coronaviruses, including that of severe acute respiratory syndrome, suggests that this protein may provide a new target for the design of antiviral therapeutics. New antiviral target revealed by the hexameric structure of mouse hepatitis virus nonstructural protein nsp15.,Xu X, Zhai Y, Sun F, Lou Z, Su D, Xu Y, Zhang R, Joachimiak A, Zhang XC, Bartlam M, Rao Z J Virol. 2006 Aug;80(16):7909-17. PMID:16873248[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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Categories: Large Structures | Murine hepatitis virus strain A59 | Lou Z | Rao Z | Su D | Sun F | Xu X | Zhai Y
