title: Latency-associated nuclear antigen of Kaposi's sarcoma-associated herpesvirus functionally interacts with heterochromatin protein 1.
abstract: Latency-associated nuclear antigen (LANA) of Kaposi's sarcoma-associated herpesvirus plays an important role in maintenance of the viral genome during latent infection. LANA additionally participates in the transcriptional regulation of several viral and cellular promoters. When tethered to constitutively active promoters, the protein exhibits transcriptional repressor activity. In this report, we further characterized cell type-, promoter-, and domain-specific transcriptional repression by LANA. We additionally speculated on the mechanism underlying transcriptional repression by the C terminus of the protein. Subnuclear localization patterns and association with heterochromatin suggested a possible link between LANA and heterochromatin protein 1, a representative heterochromatin-associated protein. In vivo and in vitro binding and immunofluorescence assays revealed that LANA associates with heterochromatin protein 1 in an isotype-specific manner. Furthermore, biochemical fractionation and transient replication assays supported the possibility that this interaction contributes to transcriptional repression, targeting to subnuclear structures, and latent DNA replication activity of LANA.
authors.affiliation: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
authors.forename: Chunghun
authors.initials: C
authors.lastname: Lim
authors.forename: Daeyoup
authors.initials: D
authors.lastname: Lee
authors.forename: Taegun
authors.initials: T
authors.lastname: Seo
authors.forename: Changtaek
authors.initials: C
authors.lastname: Choi
authors.forename: Joonho
authors.initials: J
authors.lastname: Choe
mesh_terms: D000956:Antigens, Viral; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D000090266:Chromobox Protein Homolog 5; D002868:Chromosomal Proteins, Non-Histone / Q000737:chemistry* / Q000378:metabolism*; D017353:Gene Deletion; D017930:Genes, Reporter; D019288:Herpesvirus 8, Human / Q000378:metabolism*; D006801:Humans; D008856:Microscopy, Fluorescence; D009154:Mutation; D009687:Nuclear Proteins / Q000737:chemistry* / Q000235:genetics; D010957:Plasmids / Q000378:metabolism; D011233:Precipitin Tests; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D013347:Subcellular Fractions / Q000378:metabolism; D014158:Transcription, Genetic; D014162:Transfection
chemical_list: D000956:Antigens, Viral; D002868:Chromosomal Proteins, Non-Histone; D009687:Nuclear Proteins; C109540:latency-associated nuclear antigen; D000090266:Chromobox Protein Homolog 5