Kaposi's Sarcoma-Associated Herpesvirus Latency-Associated Nuclear Antigen 1 Mediates Episome Persistence through cis-Acting Terminal Repeat (TR) Sequence and Specifically Binds TR DNA

AUTOR(ES)

Ballestas, Mary E.

FONTE

American Society for Microbiology

RESUMO

Kaposi's sarcoma (KS)-associated herpesvirus (KSHV) (also known as human herpesvirus 8) latently infects KS tumors, primary effusion lymphomas (PELs), and PEL cell lines. In latently infected cells, KSHV DNA is maintained as circularized, extrachromosomal episomes. To persist in proliferating cells, KSHV episomes must replicate and efficiently segregate to progeny nuclei. In uninfected B-lymphoblastoid cells, KSHV latency-associated nuclear antigen (LANA1) is necessary and sufficient for persistence of artificial episomes containing specific KSHV DNA. In previous work, the cis-acting sequence required for episome persistence contained KSHV terminal-repeat (TR) DNA and unique KSHV sequence. We now show that cis-acting KSHV TR DNA is necessary and sufficient for LANA1-mediated episome persistence. Furthermore, LANA1 binds TR DNA in mobility shift assays and a 20-nucleotide LANA1 binding sequence has been identified. Since LANA1 colocalizes with KSHV episomes along metaphase chromosomes, these results are consistent with a model in which LANA1 may bridge TR DNA to chromosomes during mitosis to efficiently segregate KSHV episomes to progeny nuclei.

Documentos Relacionados

• The Latency-Associated Nuclear Antigen of Kaposi's Sarcoma-Associated Herpesvirus Permits Replication of Terminal Repeat-Containing Plasmids
• The Latency-Associated Nuclear Antigen of Kaposi's Sarcoma-Associated Herpesvirus Permits Replication of Terminal Repeat-Containing Plasmids
• The Kaposi's Sarcoma-Associated Herpesvirus Latency-Associated Nuclear Antigen 1 N Terminus Is Essential for Chromosome Association, DNA Replication, and Episome Persistence
• Accumulation of Heterochromatin Components on the Terminal Repeat Sequence of Kaposi's Sarcoma-Associated Herpesvirus Mediated by the Latency-Associated Nuclear Antigen
• Protein Interactions Targeting the Latency-Associated Nuclear Antigen of Kaposi's Sarcoma-Associated Herpesvirus to Cell Chromosomes