新的蛋白社区表明了专门的生化过程
1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland, USA.
mSystems
|March 31, 2025
概括
研究人员在 prokaryotic 基因组中发现了 18 个新的蛋白家族和插入位,揭示了新的生物过程. 这一发现扩大了我们对的理解.
科学领域:
- 微生物学和基因组学 微生物学和基因组学
- 生物化学和分子生物学
背景情况:
- Prokaryotic 基因组很少编码 selenoproteins,大约每 5000 个蛋白质中就有一个.
- 在囊残留物中使用而不是硫的蛋白质,为专门的生物功能提供了洞察力.
- 来自未培养物种的元基因组组装基因组 (MAGs) 呈现出大量的新型蛋白质序列.
研究的目的:
- 在 prokaryotic 基因组中识别新型 selenoprotein 家族和 selenocysteine 插入位.
- 扩大已知的烯蛋白和它们相关的基因组语境的知识库.
- 改进基因组注释和微生物暗物质开采的计算方法.
主要方法:
- 为NCBI RefSeq和 Prokaryotic Gene Annotation Pipeline (PGAP) 使用手工策划和构建蛋白质家族模型.
- 针对已知的蛋白编码基因附近的新型蛋白的有针对性的搜索.
- 分析含有蛋白的基因组背景,包括操作子和蛋白质翻译扩展.
主要成果:
- 在以前未知的蛋白质延伸中发现了18个新的蛋白家族或新的类固醇位.
- 识别特定的蛋白语境,例如在操作子 (例如,TsoA,TsoB,TsoC,TsoX) 和TrsS中相邻的无关蛋白,这些蛋白与依赖于molybdopterin的阿尔德海德氧化降解酶相邻.
- 在各种蛋白架构中表征一种常见的类固醇插入基因 (U-X-X-stop).
结论:
- 发现了许多新的单半氨酸插入部位和单蛋白家族,表明存在许多尚未发现的蛋白质和途径.
- 手动策划和有针对性的搜索对于识别这些新型单蛋白至关重要,这些新型单蛋白通常被广泛的计算方法遗漏.
- 未来将改进的计算工具应用于全面的微生物基因组和元基因组数据集,预计将揭示新的生物化学过程.
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