The role of Cajal bodies in the expression of late phase adenovirus proteins.
Cajal bodies (CBs) are subnuclear structures involved in RNA metabolism. Here we show that, following infection of HeLa cells by adenovirus type 5 (Ad5), CBs fragment and form ordered structures, which we have termed "rosettes". Formation of CB rosettes was prevented by inhibition of viral DNA synthesis and preceded expression of the L4-33K protein. CB rosettes localised to the periphery of E2A-72K-containing replication centers and to the edges of ASF/SF2 and hnRNP A1 ring structures that demarcate sites of viral transcription and splicing. At later times of infection, CB rosettes were undetectable. Furthermore, knock-down of p80-coilin (the major structural protein of CBs) by RNA interference reduced the yield of infectious Ad5 and expression of the late proteins IIIa (from L1), hexon (from L3) and fiber (from L5), whereas the E2A-72K protein was unaffected. We conclude that CBs have an important role in the expression of adenovirus major late gene products.
James
Nicola J
NJ
Institute of Molecular and Cellular Biology, Faculty of Biological Sciences, Garstang Building, Room 8.52d, Mount Preston Street, University of Leeds, Leeds LS2 9JT, UK.
Howell
Gareth J
GJ
Walker
John H
JH
Blair
G Eric
GE
D000256:Adenoviridae / Q000235:genetics / Q000502:physiology*; D020541:Coiled Bodies / Q000378:metabolism*; D004279:DNA, Viral / Q000235:genetics; D015967:Gene Expression Regulation, Viral; D006367:HeLa Cells; D006801:Humans; D009687:Nuclear Proteins / Q000378:metabolism; D034622:RNA Interference; D012326:RNA Splicing; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000096:biosynthesis*; D014779:Virus Replication
D004279:DNA, Viral; D009687:Nuclear Proteins; D014764:Viral Proteins; C068921:p80-coilin