Ultrastructure of Exospore Formation in Streptomyces Revealed by Cryo-Electron Tomography.

ABSTRACT: Many bacteria form spores in response to adverse environmental conditions. Several sporulation pathways have evolved independently and occur through distinctive mechanisms. Here, using cryo-electron tomography (cryo-ET), we examine all stages of growth and exospore formation in the model organism Streptomyces albus. Our data reveal the native ultrastructure of vegetative hyphae, including the likely structures of the polarisome and cytoskeletal filaments. In addition, we observed septal junctions in vegetative septa, predicted to be involved in protein and DNA translocation between neighboring cells. During sporulation, the cell envelope undergoes dramatic remodeling, including the formation of a spore wall and two protective proteinaceous layers. Mature spores reveal the presence o

SUBMITTER: Sexton DL 

PROVIDER: S-EPMC7541840 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature