通过冷EM和计算建模揭示了CRESS-DNA细菌病毒之间的结构多样性和保护
L Johanna Gebhard1, Yuji Tomaru2, Kenta Okamoto1
1Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Uppsala, Sweden.
Virology journal
|December 2, 2025
概括
研究人员确定了单链DNA病毒感染藻的囊体结构,揭示了与相关病毒的关键差异以及对病毒演变的见解. 这项研究扩大了对Bacilladnaviridae结构多样性和进化的理解.
科学领域:
- 病毒学 病毒学
- 结构生物学 结构生物学
- 海洋微生物学 海洋微生物学
背景情况:
- 感染微藻的病毒在海洋生态系统中起着至关重要的作用,影响生长,社区结构和营养循环.
- 巴西拉德纳病毒家族,包括单链DNA病毒,感染海洋藻,对于理解病毒演变至关重要.
- 亚原子病毒由于其独特的遗传构成和生态影响,为早期病毒进化提供了洞察力.
研究的目的:
- 为了确定Chaetoceros lorenzianus DNA病毒 (ClorDNAV) 的状结构.
- 扩大对 ssDNA 病毒科Cressdnaviricota中的结构多样性的理解.
- 为了研究 Bacilladnaviridae 和其他病毒之间的进化关系.
主要方法:
- 使用X射线晶体学来确定ClorDNAV.的高分辨率 (2.2 Å) 体结构.
- 进行了低分辨率的基因组重建,以可视化DNA包装.
- 在ClorDNAV和其他Bacilladnaviridae病毒之间进行了比较结构分析,包括AlphaFold3预测的结构.
主要成果:
- DNAV体蛋白质表现出一个保存的果卷,表面暴露的投射域.
- 结构比较显示了ClorDNAV和CtenDNAV-II之间的五个关键差异,包括终端区域和域结构的变化.
- 对Bacilladnaviridae属的预测结构的分析证实了折叠的保护,但突出了表面和终端区域的变化,表明了宿主特定的适应.
结论:
- DNAV的确定的结构扩大了Bacilladnaviridae中已知的结构多样性.
- 结构发现为ssDNA Bacilladnaviridae从ssRNA祖先的进化提供了证据.
- 对实验和预测结构的比较分析提供了对Bacilladnaviridae家族内的结构性保护和分歧的全面观点.
关键词:
藻类病毒是一种藻类病毒.这种病毒是Bacilladnaviridae的.克雷斯-DNA病毒病毒.体结构的结构是体.DNAVV 化物低温电子显微镜的使用方法基因组包装 基因组包装这种病毒是Icosahedral病毒.果卷折叠方式单链DNA病毒是一个单链DNA病毒.更多相关视频
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