- PDB-7ypq: Cryo-EM structure of one baculovirus LEF-3 molecule in complex wi... -
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基本情報
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データベース: PDB / ID: 7ypq
タイトル
Cryo-EM structure of one baculovirus LEF-3 molecule in complex with ssDNA
要素
DNA (5'-D(P*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*A)-3')
Lef3
キーワード
DNA BINDING PROTEIN / ssDNA / SSB / Baculovirus
機能・相同性
Nucleopolyhedrovirus late expression factor 3 / Nucleopolyhedrovirus late expression factor 3 (LEF-3) / regulation of DNA-templated transcription / DNA binding / DNA / DNA (> 10) / Lef3
ジャーナル: Nucleic Acids Res / 年: 2022 タイトル: Structural transitions during the cooperative assembly of baculovirus single-stranded DNA-binding protein on ssDNA. 著者: Jiayi Yin / Yan Fu / Guibo Rao / Zhiqiang Li / Kexing Tian / Tingting Chong / Kai Kuang / Manli Wang / Zhihong Hu / Sheng Cao / 要旨: Single-stranded DNA-binding proteins (SSBs) interact with single-stranded DNA (ssDNA) to form filamentous structures with various degrees of cooperativity, as a result of intermolecular interactions ...Single-stranded DNA-binding proteins (SSBs) interact with single-stranded DNA (ssDNA) to form filamentous structures with various degrees of cooperativity, as a result of intermolecular interactions between neighboring SSB subunits on ssDNA. However, it is still challenging to perform structural studies on SSB-ssDNA filaments at high resolution using the most studied SSB models, largely due to the intrinsic flexibility of these nucleoprotein complexes. In this study, HaLEF-3, an SSB protein from Helicoverpa armigera nucleopolyhedrovirus, was used for in vitro assembly of SSB-ssDNA filaments, which were structurally studied at atomic resolution using cryo-electron microscopy. Combined with the crystal structure of ssDNA-free HaLEF-3 octamers, our results revealed that the three-dimensional rearrangement of HaLEF-3 induced by an internal hinge-bending movement is essential for the formation of helical SSB-ssDNA complexes, while the contacting interface between adjacent HaLEF-3 subunits remains basically intact. We proposed a local cooperative SSB-ssDNA binding model, in which, triggered by exposure to oligonucleotides, HaLEF-3 molecules undergo ring-to-helix transition to initiate continuous SSB-SSB interactions along ssDNA. Unique structural features revealed by the assembly of HaLEF-3 on ssDNA suggest that HaLEF-3 may represent a new class of SSB.
履歴
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2022年8月4日
登録サイト: PDBJ / 処理サイト: PDBJ
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2023年1月25日
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