RESUMO
The ParA/MinD (A/D) family of ATPases spatially organize an array of genetic- and protein-based cellular cargos across the bacterial and archaeal domains of life. By far, the two best-studied members, and family namesake, are ParA and MinD, involved in bacterial DNA segregation and divisome positioning, respectively. ParA and MinD make protein waves on the nucleoid or membrane to segregate chromosomes and position the divisome. Less studied is the growing list of A/D ATPases widespread across bacteria and implicated in the subcellular organization of diverse protein-based complexes and organelles involved in myriad biological processes, from metabolism to pathogenesis. Here we describe mechanistic commonality, variation, and coordination among the most widespread family of positioning ATPases used in the subcellular organization of disparate cargos across bacteria and archaea.
Assuntos
Adenosina Trifosfatases , Archaea , Bactérias , Proteínas de Bactérias , Adenosina Trifosfatases/metabolismo , Adenosina Trifosfatases/genética , Archaea/genética , Archaea/enzimologia , Archaea/metabolismo , Bactérias/genética , Bactérias/enzimologia , Bactérias/metabolismo , Proteínas de Bactérias/metabolismo , Proteínas de Bactérias/genética , DNA Bacteriano/genética , DNA Bacteriano/metabolismo , Proteínas Arqueais/metabolismo , Proteínas Arqueais/genética , Segregação de CromossomosRESUMO
In eukaryotes, linear motor proteins govern intracellular transport and organization. In bacteria, where linear motors involved in spatial regulation are absent, the ParA/MinD family of ATPases organize an array of genetic- and protein-based cellular cargos. The positioning of these cargos has been independently investigated to varying degrees in several bacterial species. However, it remains unclear how multiple ParA/MinD ATPases can coordinate the positioning of diverse cargos in the same cell. Here, we find that over a third of sequenced bacterial genomes encode multiple ParA/MinD ATPases. We identify an organism (Halothiobacillus neapolitanus) with seven ParA/MinD ATPases, demonstrate that five of these are each dedicated to the spatial regulation of a single cellular cargo, and define potential specificity determinants for each system. Furthermore, we show how these positioning reactions can influence each other, stressing the importance of understanding how organelle trafficking, chromosome segregation, and cell division are coordinated in bacterial cells. Together, our data show how multiple ParA/MinD ATPases coexist and function to position a diverse set of fundamental cargos in the same bacterial cell.
