使用结构生物信息学识别VI型分泌系统的效应因子-免疫对
Alexander M Geller1, Maor Shalom1, David Zlotkin1
1Department of Plant Pathology and Microbiology, The Institute of Environmental Science, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel.
Molecular systems biology
|April 24, 2024
概括
结构生物信息学工具确定了517个VI型分泌系统效应器 (T6SS) 家族及其免疫蛋白. 这项研究为了解细菌相互作用和开发新型抗菌药物提供了有价值的数据库.
科学领域:
- 微生物学 微生物学
- 结构生物信息学 结构生物信息学
- 基因组学就是基因组学.
背景情况:
- 第六类分泌系统 (T6SS) 对于细菌相互作用至关重要,它将有毒效应物 (T6E) 输送到细胞中.
- T6SS效应器需要相关的免疫蛋白来防止自我中毒.
- 发现和注释这些效应体免疫对对于理解细菌毒性和细菌间竞争至关重要.
研究的目的:
- 系统地发现和功能地注释T6SS效应体 (T6Es) 和它们的相关免疫蛋白,使用新的结构生物信息学方法.
- 开发T6E免疫蛋白相互作用的预测模型.
- 创建一个全面的,注释的T6E免疫对数据库.
主要方法:
- 应用结构聚类对17,920个T6SS编码细菌基因组的数据集,以识别T6E家族.
- 开发了一个后勤回归模型来预测T6E-免疫对的蛋白质-蛋白质相互作用.
- 使用基于结构的注释来对T6E进行功能性表征.
- 在大肠杆菌中对选择的T6E免疫对进行实验验证.
主要成果:
- 使用结构聚类识别了517个假定T6E家族,超越了基于序列的方法.
- 通过逻辑回归模型预测231个T6E家族的候选免疫蛋白.
- 使用基于结构的注释实现了T6E家族51%的功能注释.
- 验证了四种新的T6E免疫对,包括DUF3289作为素M同类物和DUF943作为其免疫蛋白.
- 发现了一种与SleB同源的新型T6E,并确定了其可谓的催化残留物.
结论:
- 新型结构生物信息学工具能够有效和准确地发现和注释T6SS效应因子和免疫蛋白.
- 该研究提供了T6E免疫对的广泛的注释数据库,促进了对细菌分泌系统的理解.
- 这些发现有助于潜在开发针对T6SS机制的新抗菌策略.
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