文献类型： 外文期刊

作者： Chen, Rong ¹ ; Zhao, Lin ¹ ; Gan, Rong ¹ ; Feng, Zhixin ² ; Cui, Chenxi ³ ; Xie, Xing ² ; Hao, Fei ² ; Zhang, Zhenzhen ² ; Wang, Li ² ; Ran, Tingting ⁴ ; Wang, Weiwu ⁴ ; Zhang, Shuijun ⁵ ; Li, Yufeng ¹ ; Zhang, Wei ⁶ ; Pang, Maoda ⁷ ; Xiong, Qiyan ¹ ; Shao, Guoqing ¹ ;

作者机构： 1.Nanjing Agr Univ, Coll Vet Med, Nanjing, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Vet Med, Nanjing, Peoples R China

3.Chinese Acad Sci, Natl Lab Biomacromol, CAS Ctr Excellence Biomacromol, Inst Biophys, Beijing, Peoples R China

4.Nanjing Agr Univ, Key Lab Agr & Environm Microbiol, Coll Life Sci, Minist Agr, Nanjing, Peoples R China

5.Nanjing Agr Univ, Coll Life Sci, Nanjing, Peoples R China

6.Nanjing Agr Univ, Key Lab Anim Bacteriol, Minist Agr, OIE Reference Lab Swine Streptococcosis,Coll Vet, Nanjing, Peoples R China

7.Jiangsu Acad Agr Sci, State Key Lab Cultivat Base MOST, Inst Food Safety & Nutr, Nanjing, Peoples R China

关键词： crstal structure; enolase; divergent evolution; mycoplasma; mollicutes

期刊名称：FRONTIERS IN MOLECULAR BIOSCIENCES （ 影响因子：6.113； 五年影响因子：6.122 ）

ISSN：

年卷期： 2022 年 8 卷

页码：

收录情况： SCI

摘要： Mycoplasmas are a group of prokaryotes without cell walls that have evolved through several rounds of degenerative evolution. With a low cell DNA G + C content and definitively long genetic lineages, mycoplasmas are thought to be in a state of rapid evolution. However, little associated evidence has been provided. Enolase is a key enzyme in glycolysis that is widely found in all species from the three domains, and it is evolutionarily conserved. In our previous studies, enolase acted as a virulence factor and participated in cell-surface adhesion in Mycoplasma hyopneumoniae. Furthermore, unique loop regions were first found in the crystal structure of Mhp Eno. Here, enolase structures from Mycoplasma pneumoniae and Mycoplasma bovis were determined. An extra helix 7 is specific and conservatively found in almost all mycoplasma enolases, as confirmed by crystal structures and sequence alignment. Particular motifs for helix 7, which is composed of F-K/G-K-L/F-K-X-A-I, have been proposed and could be regarded as molecular markers. To our surprise, the genetic distances between any two mycoplasma enolases were obviously longer than those between the two corresponding species themselves, indicating divergent evolution of mycoplasma enolases, whereas no horizontal gene transfer was detected in mycoplasma enolase genens. Furthermore, different evolutionary patterns were adopted by different loop regions of mycoplasma enolase. Enolases from different Mycoplasma species also showed different affinities for PLG and fibronectin. Our results indicate the rapid and divergent evolution of mycoplasma enolase and mycoplasmas. This study will also aid understanding the independent evolution of Mycoplasma species after separation from their common ancestor.