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-Structure paper
タイトル | The Cryo-EM structure of AAV2 Rep68 in complex with ssDNA reveals a malleable AAA+ machine that can switch between oligomeric states. |
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ジャーナル・号・ページ | Nucleic Acids Res, Vol. 48, Issue 22, Page 12983-12999, Year 2020 |
掲載日 | 2020年12月16日 |
著者 | Vishaka Santosh / Faik N Musayev / Rahul Jaiswal / Francisco Zárate-Pérez / Bram Vandewinkel / Caroline Dierckx / Molly Endicott / Kamyar Sharifi / Kelly Dryden / Els Henckaerts / Carlos R Escalante / |
PubMed 要旨 | The adeno-associated virus (AAV) non-structural Rep proteins catalyze all the DNA transactions required for virus viability including, DNA replication, transcription regulation, genome packaging, and ...The adeno-associated virus (AAV) non-structural Rep proteins catalyze all the DNA transactions required for virus viability including, DNA replication, transcription regulation, genome packaging, and during the latent phase, site-specific integration. Rep proteins contain two multifunctional domains: an Origin Binding Domain (OBD) and a SF3 helicase domain (HD). Studies have shown that Rep proteins have a dynamic oligomeric behavior where the nature of the DNA substrate molecule modulates its oligomeric state. In the presence of ssDNA, Rep68 forms a large double-octameric ring complex. To understand the mechanisms underlying AAV Rep function, we investigated the cryo-EM and X-ray structures of Rep68-ssDNA complexes. Surprisingly, Rep68 generates hybrid ring structures where the OBD forms octameric rings while the HD forms heptamers. Moreover, the binding to ATPγS promotes a large conformational change in the entire AAA+ domain that leads the HD to form both heptamer and hexamers. The HD oligomerization is driven by an interdomain linker region that acts as a latch to 'catch' the neighboring HD subunit and is flexible enough to permit the formation of different stoichiometric ring structures. Overall, our studies show the structural basis of AAV Rep's structural flexibility required to fulfill its multifunctional role during the AAV life cycle. |
リンク | Nucleic Acids Res / PubMed:33270897 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 3.3 - 6.7 Å |
構造データ | EMDB-22451, PDB-7jse: EMDB-22452, PDB-7jsf: EMDB-22453: Adeno-Associated Virus 2 Rep68 HD Hexamer-ssDNA with ATPgS EMDB-22454, PDB-7jsh: EMDB-22455, PDB-7jsi: PDB-6xb8: |
化合物 | ChemComp-ZN: |
由来 |
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キーワード | VIRAL PROTEIN / AAV / Protein-DNA / AAA+ / SF3 / HUH / VIRAL PROTEIN/DNA / VIRAL PROTEIN-DNA complex |