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-Structure paper
| タイトル | Structural insights into HSV-1 origin unwinding by the viral proteins UL9 and ICP8. |
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| ジャーナル・号・ページ | Nucleic Acids Res, Vol. 54, Issue 11, Year 2026 |
| 掲載日 | 2026年6月8日 |
著者 | Andrey G Baranovskiy / Lucia M Morstadt / Eduardo E Romero / Nigar D Babayeva / Tahir H Tahirov / ![]() |
| PubMed 要旨 | Herpes simplex virus type 1 (HSV-1) causes lifelong infections in human cells and is associated with a range of diseases. HSV-1 DNA replication requires seven viral proteins, including the major DNA- ...Herpes simplex virus type 1 (HSV-1) causes lifelong infections in human cells and is associated with a range of diseases. HSV-1 DNA replication requires seven viral proteins, including the major DNA-binding protein ICP8, the origin-binding protein UL9, and proteins that comprise the helicase-primase and DNA polymerase complexes. UL9 functions as a DNA helicase that specifically recognizes and binds to the viral origins of replication, OriS and OriL. Here we report the cryo-EM structure of the UL9/ICP8/DNA/ATPγS complex at an overall resolution of 3.18 Å. This structure revealed that UL9 employs an α-helix to separate the DNA strands and captures the initial step of OriS unwinding, in which the C-terminal domain of UL9 specifically binds to the major groove of a DNA double helix, while the N-terminal helicase domain engages the unwound leading and lagging strands. ICP8 interacts with the extreme C-terminal region of UL9, preventing UL9 dimerization. Simultaneously, it binds and stabilizes the leading-strand DNA adjacent to UL9. Together, these findings provide mechanistic insight into UL9-driven DNA unwinding and the cooperative action of UL9 and ICP8 at HSV-1 replication origins, establishing a structural framework for the rational interpretation of prior biochemical data and for the design of new antiviral drugs. |
リンク | Nucleic Acids Res / PubMed:42283126 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.1 - 3.2 Å |
| 構造データ | ![]() EMDB-74143: The sharpened consensus map for UL9-ICP8-DNA complex ![]() EMDB-74144: The focused map for ICP8-DNA ![]() EMDB-74145: The focused map for UL9-DNA EMDB-74190, PDB-9zgf: |
| 化合物 | ![]() ChemComp-ZN: ![]() ChemComp-MG: ![]() ChemComp-AGS: |
| 由来 |
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キーワード | REPLICATION/DNA / DNA replication / protein-DNA complex / REPLICATION-DNA complex |
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human alphaherpesvirus 1 strain 17 (ヘルペスウイルス)
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