The Nucleosomal Surface as a Docking Station for Kaposi's Sarcoma Herpesvirus LANA

作者：Andrew J. Barbera, Jayanth V. Chodaparambil, Brenna Kelley-Clarke, Vladimir Joukov, Johannes C. Walter, Karolin Luger, Kenneth M. Kaye · 发表于：Science · 年份：2006 · DOI：10.1126/science.1120541 · 被引用次数：521 · 研究领域：Viral-associated cancers and disorders、Cytomegalovirus and herpesvirus research、Herpesvirus Infections and Treatments

Kaposi's sarcoma-associated herpesvirus (KSHV) latency-associated nuclear antigen (LANA) mediates viral genome attachment to mitotic chromosomes. We find that N-terminal LANA docks onto chromosomes by binding nucleosomes through the folded region of histones H2A-H2B. The same LANA residues were required for both H2A-H2B binding and chromosome association. Further, LANA did not bind Xenopus sperm chromatin, which is deficient in H2A-H2B; chromatin binding was rescued after assembly of nucleosomes containing H2A-H2B. We also describe the 2.9-angstrom crystal structure of a nucleosome complexed with the first 23 LANA amino acids. The LANA peptide forms a hairpin that interacts exclusively with an acidic H2A-H2B region that is implicated in the formation of higher order chromatin structure. Our findings present a paradigm for how nucleosomes may serve as binding platforms for viral and cellular proteins and reveal a previously unknown mechanism for KSHV latency.