果友乳酸细菌中非常大的细胞外蛋白的起源和演变
Julia E Pedersen1, Marina Mota-Merlo1, Andrea Garcia-Montaner1
1Molecular Evolution, Department of Cell and Molecular Biology, Biomedical Centre, Science for Life Laboratory, Uppsala University, Uppsala, 752 36, Sweden.
Genome biology and evolution
|January 22, 2026
概括
蜜蜂共生体Apilactobacillus kunkeei中巨大的表面蛋白质的起源是不同的. 巨人1-3蛋白质显示水平基因转移,而巨人4-5在物种内最近进化.
科学领域:
- 微生物基因组学和进化过程
- 细菌表面蛋白质的结构和功能.
- 昆虫中的共生关系
背景情况:
- 大型细胞外表面蛋白对于细菌的功能,如聚合和细胞相互作用至关重要.
- 蜜蜂共生体Apilactobacillus kunkeei拥有五个大型表面蛋白质基因 (Giant1-5),占其基因组的很大一部分.
研究的目的:
- 为了预测Apilactobacillus kunkeei的Giant1-5蛋白质的结构.
- 为了研究这些巨大的表面蛋白质的进化起源和多样化.
主要方法:
- 使用计算方法预测蛋白质结构.
- 对Giant1-3蛋白质β-solenoid域的遗传学分析.
- 比较基因组学以确定Giant4-5基因在相关物种中的分布.
主要成果:
- 结构预测揭示了Giant1-4蛋白质中保存的N终端β-基域,类似于调解细胞和糖蛋白结合的域.
- 遗传学分析表明,与远距离相关的乳酸细菌属之间的Giant1-3β-solenoid域的序列交换 (水平基因转移).
- 在A. kunkeei中的Giant1-3基因多样化主要是由于内基因重组而产生的,而Giant4-5基因似乎是最近在A. kunkeei.中获得和共同进化的.
结论:
- 这项研究阐明了A. kunkeei中巨型表面蛋白的复杂进化史,涉及横向基因转移和内基因重组.
- 这些发现提供了关于这些蛋白质适应与蜜蜂及其产品相关的碳水化合物丰富环境的见解.
- 这些结构和进化数据有助于理解细菌适应和大表面蛋白在共生相互作用中的作用.
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