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Title

The structure of a protein primer-polymerase complex in the initiation of genome replication

AuthorsFerrer-Orta, Cristina ; Arias, Armando ; Agudo, Rubén ; Pérez-Luque, Rosa ; Escarmís, Cristina; Domingo, Esteban ; Verdaguer, Núria
KeywordsVPg
Uridylylation
Replication
Primer-protein
Foot-and-mouth disease virus
Issue Date2-Feb-2006
PublisherNature Publishing Group
CitationEMBO Journal 25(4): 880-888 (2006)
AbstractPicornavirus RNA replication is initiated by the covalent attachment of a UMP molecule to the hydroxyl group of a tyrosine in the terminal protein VPg. This reaction is carried out by the viral RNA-dependent RNA polymerase (3D). Here, we report the X-ray structure of two complexes between foot-and-mouth disease virus 3D, VPg1, the substrate UTP and divalent cations, in the absence and in the presence of an oligoadenylate of 10 residues. In both complexes, VPg fits the RNA binding cleft of the polymerase and projects the key residue Tyr3 into the active site of 3D. This is achieved by multiple interactions with residues of motif F and helix α8 of the fingers domain and helix α13 of the thumb domain of the polymerase. The complex obtained in the presence of the oligoadenylate showed the product of the VPg uridylylation (VPg-UMP). Two metal ions and the catalytic aspartic acids of the polymerase active site, together with the basic residues of motif F, have been identified as participating in the priming reaction. © 2006 European Molecular Biology Organization | All Rights Reserved.
Publisher version (URL)http://dx.doi.org/10.1038/sj.emboj.7600971
URIhttp://hdl.handle.net/10261/110066
DOIhttp://dx.doi.org/10.1038/sj.emboj.7600971
Identifiersdoi: 10.1038/sj.emboj.7600971
issn: 0261-4189
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