概括
大肠杆菌的化学反应涉及了Tar,Tap和Tsr蛋白质. 对比序列分析揭示了为甲基化和适应而保留的细胞内域,以及为不同的化学受体功能而分离的细胞外域.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 细菌大肠杆菌 (E. coli) 使用化学反应来导航其环境,其介导是由转换器蛋白质编码的基因,如和tsr.
- 这些基因编码具有功能相似的传感器蛋白质,参与不同的化学反应.
- 位于*tar*附近的*tap*基因也被假设为编码传感器蛋白质.
研究的目的:
- 确定大肠杆菌基因组*中的 *tar-tap* 区域的完整核酸序列.
- 为了对Tar,Tap和Tsr转换器蛋白进行比较序列分析.
主要方法:
- 在 *tar-tap* 基因组区域的 DNA 测序.
- 生物信息对 *tar*, *tap* 和 *tsr* 基因产品进行比较序列分析.
主要成果:
- 解释了 *tar-tap* 区域的完整核酸序列.
- 对比分析显示,Tar,Tap和Tsr蛋白具有共同的跨膜结构:一个细胞外N终端域,一个覆盖膜的域和一个细胞内C终端域.
- C端域表现出高序列同质性,并包含对感觉适应至关重要的甲基化位点.
- N-终端域显示远程序列相关性,表明作为化疗受体的功能分歧.
结论:
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- 保存的细胞内域通过甲基化促进化学反应适应.
- 不同的细胞外域使蛋白质能够识别不同的环境刺激,调解不同的化学反应行为.
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