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TitleCryo-EM structure of the glycosylated protein CgeA in the crust of Bacillus subtilis endospores.
Journal, issue, pagesJ Microbiol, Vol. 63, Issue 10, Page e2504013, Year 2025
Publish dateOct 31, 2025
AuthorsMigak Park / Doyeon Kim / Yeongjin Baek / Eunbyul Jo / Jaekyung Hyun / Nam-Chul Ha /
PubMed AbstractThe Bacillus subtilis spore crust is an exceptionally robust proteinaceous layer that protects spores under extreme environmental conditions. Among its key components, CgeA, a glycosylation- ...The Bacillus subtilis spore crust is an exceptionally robust proteinaceous layer that protects spores under extreme environmental conditions. Among its key components, CgeA, a glycosylation-associated protein, plays a critical role in modifying crust properties through its glycosylated moiety, enhancing spore dispersal in aqueous environments. In this study, we present the high-resolution cryo-electron microscopy structure of the core region of CgeA at 3.05 Å resolution, revealing a doughnut-like hexameric assembly. The N-terminal regions are disordered, whereas the C-terminal region forms the core of the hexamer. Although the loop containing Thr112 was not resolved in the density map, its location can be inferred from surrounding residues, suggesting that Thr112 is situated on the exposed surface of the hexamer. On the opposite face, a distinct electrostatic pattern is observed, featuring a negatively charged central pore and a positively charged outer surface. Modeling and biochemical studies with the putative glycosyltransferase CgeB provide insights into how the glycosyl group is transferred to Thr112. This study offers a molecular-level understanding of the assembly, glycosylation, and environmental adaptability of the B. subtilis spore crust, with valuable implications for controlling spore formation in industrial applications.
External linksJ Microbiol / PubMed:41164959
MethodsEM (single particle)
Resolution3.05 Å
Structure data

62902

9l9d

EMDB-62902, PDB-9l9d:
Bacillus subtilis endospore crust protein CgeA
Method: EM (single particle) / Resolution: 3.05 Å

Source
  • bacillus subtilis subsp. subtilis str. 168 (bacteria)
KeywordsSTRUCTURAL PROTEIN / Glycoprotein / Sporulation / Bacillus subtilis

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