A comprehensive analysis of recruitment and transactivation potential of K-Rta and K-bZIP during reactivation of Kaposi's sarcoma-associated herpesvirus.
Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiologic agent of Kaposi's sarcoma. K-Rta and K-bZIP are two major viral transcription factors that control reactivation of this virus. Here we report a genome-wide analysis of transcriptional capacity by evaluation of a comprehensive library of 83 putative KSHV promoters. In reporter assays, 34 viral promoters were activated by K-Rta, whereas K-bZIP activated 21 promoters. When K-Rta and K-bZIP were combined, 3 K-Rta responsive promoters were repressed by K-bZIP. The occupancy of K-Rta and K-bZIP across KSHV promoters was analyzed by chromatin immunoprecipitation with a viral promoter-chip in BCBL-1 cells. In addition, acetylation of local histones was examined to determine accessibility of promoters during latency and reactivation. Finally, 10 promoters were selected to study the dynamics of transcription factor recruitment. This study provides a comprehensive overview of the responsiveness of KSHV promoters to K-Rta and K-bZIP, and describes key chromatin changes during viral reactivation.
Ellison
Thomas J
TJ
Department of Biological Chemistry, University of California, Davis (UC Davis) School of Medicine, UC Davis Cancer Center, Sacramento, CA 95817, USA.
Izumiya
Yoshihiro
Y
Izumiya
Chie
C
Luciw
Paul A
PA
Kung
Hsing-Jien
HJ
D050976:Basic-Leucine Zipper Transcription Factors; D002460:Cell Line; D004279:DNA, Viral / Q000235:genetics; D015967:Gene Expression Regulation, Viral; D019288:Herpesvirus 8, Human / Q000235:genetics / Q000502:physiology*; D006801:Humans; D017874:Immediate-Early Proteins / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000502:physiology*; D015534:Trans-Activators / Q000737:chemistry / Q000378:metabolism / Q000502:physiology*; D015533:Transcriptional Activation; D014775:Virus Activation; D014779:Virus Replication
D050976:Basic-Leucine Zipper Transcription Factors; D004279:DNA, Viral; D017874:Immediate-Early Proteins; D015534:Trans-Activators