title: Infection cycles of large DNA viruses: emerging themes and underlying questions.
abstract: The discovery of giant DNA viruses and the recent realization that such viruses are diverse and abundant blurred the distinction between viruses and cells. These findings elicited lively debates on the nature and origin of viruses as well as on their potential roles in the evolution of cells. The following essay is, however, concerned with new insights into fundamental structural and physical aspects of viral replication that were derived from studies conducted on large DNA viruses. Specifically, the entirely cytoplasmic replication cycles of Mimivirus and Vaccinia are discussed in light of the highly limited trafficking of large macromolecules in the crowded cytoplasm of cells. The extensive spatiotemporal order revealed by cytoplasmic viral factories is described and contended to play an important role in promoting the efficiency of these 'nuclear-like' organelles. Generation of single-layered internal membrane sheets in Mimivirus and Vaccinia, which proceeds through a novel membrane biogenesis mechanism that enables continuous supply of lipids, is highlighted as an intriguing case study of self-assembly. Mimivirus genome encapsidation was shown to occur through a portal different from the 'stargate' portal that is used for genome release. Such a 'division of labor' is proposed to enhance the efficacy of translocation processes of very large viral genomes. Finally, open questions concerning the infection cycles of giant viruses to which future studies are likely to provide novel and exciting answers are discussed.
authors.affiliation: Department of Structural Biology, The Weizmann Institute of Science, Rehovot 76100, Israel. Electronic address: yael.mutsafi@weizmann.ac.il.
authors.forename: Yael
authors.initials: Y
authors.lastname: Mutsafi
authors.affiliation: Department of Structural Biology, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Yael
authors.initials: Y
authors.lastname: Fridmann-Sirkis
authors.affiliation: Department of Structural Biology, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Elad
authors.initials: E
authors.lastname: Milrot
authors.affiliation: Department of Structural Biology, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Liron
authors.initials: L
authors.lastname: Hevroni
authors.affiliation: Department of Structural Biology, The Weizmann Institute of Science, Rehovot 76100, Israel. Electronic address: avi.minsky@weizmann.ac.il.
authors.forename: Abraham
authors.initials: A
authors.lastname: Minsky
mesh_terms: D000656:Amoeba / Q000821:virology; D002462:Cell Membrane / Q000821:virology; D003593:Cytoplasm / Q000821:virology; D004267:DNA Viruses / Q000235:genetics* / Q000502:physiology / Q000648:ultrastructure; D004279:DNA, Viral / Q000235:genetics; D056890:Eukaryota / Q000821:virology*; D019143:Evolution, Molecular; D016679:Genome, Viral / Q000235:genetics*; D017348:Microscopy, Electron, Scanning Transmission; D056686:Mimiviridae / Q000235:genetics / Q000502:physiology / Q000648:ultrastructure; D056224:Viral Structures; D019065:Virus Assembly; D014779:Virus Replication
chemical_list: D004279:DNA, Viral
keywords: Bacteriophages; Giant viruses; Herpesvirus; Membrane biogenesis; Mimivirus; Nucleocytoplasmic large dsDNA viruses (NCLDVs); Pandoraviruses; Stargate; Vaccinia; Viral factories