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Título

Vaccinia virus B1R kinase interacts with JIP1 and modulates c-Jun dependent signalling

AutorSantos, Claudio R.; Blanco, Sandra CSIC ORCID CVN; Sevilla Hernández, Ana CSIC ORCID; Lazo, Pedro A. CSIC ORCID
Palabras claveVaccinia
Kinase
Fecha de publicación2006
CitaciónJournal of Virology 80(15): 7667-7675 (2006)
ResumenViruses have to adjust to the host cell to guarantee their life cycle and survival. This aspect of the virus-host cell interaction is probably performed by viral proteins, such as serine-threonine kinases, that are present early during infection. Vaccinia virus has an early Ser-Thr kinase, B1R, which, although required for successful viral infection, is poorly characterized regarding its effects on cellular proteins, and thus, its potential contribution to pathogenesis is not known. Signaling by mitogen-activated protein kinase (MAPK) is mediated by the assembly of complexes between these kinases and the JIP scaffold proteins. To understand how vaccinia virus B1R can affect the host, its roles in the cellular signaling by MAPK complexes and c-Jun activation have been studied. Independently of its kinase activity, B1R can interact with the central region of the JIP1 scaffold protein. The B1R-JIP1 complex increases the amount of MAPK bound to JIP1; thus, MKK7 and TAK1 either bind with higher affinity or bind more stably to JIP1, while there is an increase in the phosphorylation state of JNK bound to JIP1. The functional consequence of these more stable interactions is an increase in the activity of transcription factors, such as c-Jun, that respond to these complexes. Furthermore, B1R is also able to directly phosphorylate c-Jun in residues different from those targeted by JNK and, thus, B1R can also cooperate by an independent route in c-Jun activation. Vaccinia virus B1R can thus modulate the signaling of pathways that respond to cellular stress.
Versión del editorhttp://dx.doi.org/10.1128/JVI.00967-06
URIhttp://hdl.handle.net/10261/7157
DOI10.1128/JVI.00967-06
ISSN0022-538X
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