title: Morphological, Biochemical, and Functional Study of Viral Replication Compartments Isolated from Adenovirus-Infected Cells.
abstract: Adenovirus (Ad) replication compartments (RC) are nuclear microenvironments where the viral genome is replicated and a coordinated program of late gene expression is established. These virus-induced nuclear sites seem to behave as central hubs for the regulation of virus-host cell interactions, since proteins that promote efficient viral replication as well as factors that participate in the antiviral response are coopted and concentrated there. To gain further insight into the activities of viral RC, here we report, for the first time, the morphology, composition, and activities of RC isolated from Ad-infected cells. Morphological analyses of isolated RC particles by superresolution microscopy showed that they were indistinguishable from RC within infected cells and that they displayed a dynamic compartmentalization. Furthermore, the RC-containing fractions (RCf) proved to be functional, as they directed de novo synthesis of viral DNA and RNA as well as RNA splicing, activities that are associated with RC in vivo. A detailed analysis of the production of viral late mRNA from RCf at different times postinfection revealed that viral mRNA splicing occurs in RC and that the synthesis, posttranscriptional processing, and release from RC to the nucleoplasm of individual viral late transcripts are spatiotemporally separate events. The results presented here demonstrate that RCf are a powerful system for detailed study into RC structure, composition, and activities and, as a result, the determination of the molecular mechanisms that induce the formation of these viral sites of adenoviruses and other nuclear-replicating viruses.
  
  
  OBJECTIVE
  RC may represent molecular hubs where many aspects of virus-host cell interaction are controlled. Here, we show by superresolution microscopy that RCf have morphologies similar to those of RC within Ad-infected cells and that they appear to be compartmentalized, as nucleolin and DBP display different localization in the periphery of these viral sites. RCf proved to be functional, as they direct de novo synthesis of viral DNA and mRNA, allowing the detailed study of the regulation of viral genome replication and expression. Furthermore, we show that the synthesis and splicing of individual viral late mRNA occurs in RC and that they are subject to different temporal patterns of regulation, from their synthesis to their splicing and release from RC to the nucleoplasm. Hence, RCf represent a novel system to study molecular mechanisms that are orchestrated in viral RC to take control of the infected cell and promote an efficient viral replication cycle.
authors.affiliation: Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos (UAEM), Cuernavaca, Morelos, México Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, México.
authors.forename: Paloma
authors.initials: P
authors.lastname: Hidalgo
authors.affiliation: Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos (UAEM), Cuernavaca, Morelos, México Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, México.
authors.forename: Lourdes
authors.initials: L
authors.lastname: Anzures
authors.affiliation: Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos (UAEM), Cuernavaca, Morelos, México.
authors.forename: Armando
authors.initials: A
authors.lastname: Hernández-Mendoza
authors.affiliation: Laboratorio Nacional de Microscopía Avanzada, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, México.
authors.forename: Adán
authors.initials: A
authors.lastname: Guerrero
authors.affiliation: Laboratorio Nacional de Microscopía Avanzada, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Cuernavaca, Morelos, México.
authors.forename: Christopher D
authors.initials: CD
authors.lastname: Wood
authors.affiliation: Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos (UAEM), Cuernavaca, Morelos, México.
authors.forename: Margarita
authors.initials: M
authors.lastname: Valdés
authors.affiliation: Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Dobner
authors.affiliation: Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos (UAEM), Cuernavaca, Morelos, México rgonzalez@uaem.mx.
authors.forename: Ramón A
authors.initials: RA
authors.lastname: Gonzalez
mesh_terms: D000257:Adenoviridae Infections / Q000821:virology*; D000260:Adenoviruses, Human / Q000235:genetics / Q000502:physiology*; D002460:Cell Line; D002467:Cell Nucleus; D019295:Computational Biology; D004279:DNA, Viral / Q000235:genetics; D004268:DNA-Binding Proteins; D016679:Genome, Viral / Q000235:genetics*; D057809:HEK293 Cells; D006801:Humans; D012323:RNA Processing, Post-Transcriptional / Q000235:genetics*; D012326:RNA Splicing / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics; D012367:RNA, Viral / Q000235:genetics; D014779:Virus Replication / Q000235:genetics / Q000502:physiology*
chemical_list: D004279:DNA, Viral; D004268:DNA-Binding Proteins; D012333:RNA, Messenger; D012367:RNA, Viral