神秘的细菌微型蛋白质组
Igor Fesenko1, Harutyun Sahakyan1, Svetlana A Shabalina1
1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA.
bioRxiv : the preprint server for biology
|June 21, 2024
概括
研究人员探索了编码微蛋白的细菌小型开放读取框架 (smORF),发现了在选择中的67,297个集群. 这些微蛋白可能会调节邻近基因的活动,特别是在压力期间.
科学领域:
- 基因组学就是基因组学.
- 蛋白质组学是指蛋白质组学.
- 细菌生物学 细菌生物学
背景情况:
- 由小型开放式读取框架 (smORF) 编码的微蛋白质占蛋白质"暗物质"的很大一部分.
- 虽然功能性微蛋白在各个生命领域都已知,但细菌smORF研究不足.
- 细菌中的基因间smORFs (ismORFs) 的特征特别差.
研究的目的:
- 为了全面识别和表征肠杆菌家族的跨基因小开放阅读框架 (ismORFs).
- 研究细菌ismORFs编码的微蛋白的潜在功能和相互作用.
- 为未来的研究创建预测微蛋白家族的目录.
主要方法:
- 对5,668个Enterobacteriaceae基因组进行全基因组分析,以识别ismORFs (15-70个编码子).
- 计算分析以检测作用于ismORFs的净化选择.
- 使用AlphaFold Multimer进行结构预测,以建模微蛋白相互作用.
- 合成分析,结构预测和转录/翻译数据集成.
主要成果:
- 在净化选择下识别了67,297个细菌ismORFs集群.
- 编码的微蛋白质的特征主要是疏水性,潜在的跨膜性和最小结构性.
- 预测微蛋白与邻近蛋白质的相互作用,表明调节作用,特别是在压力条件下.
- 编制预测微蛋白家族的目录,并提供不同程度的支持性证据.
结论:
- 细菌的ismORFs编码了一组多样化的微蛋白,具有潜在的调节功能.
- 微蛋白可能在细胞过程中发挥关键作用,特别是在对环境压力的反应中.
- 产生的目录为探索细菌微蛋白的生物学意义提供了宝贵的资源.
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