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Publication Abstract from PubMed

Pathogenic bacteria utilize a variety of pilus filaments to colonize intestinal epithelia, including those synthesized by the chaperone-usher or type IV pilus assembly pathway. Despite the importance of these filaments as potential drug and vaccine targets, their large size and dynamic nature make high-resolution structure determination challenging. Here, we used cryo-electron microscopy (cryo-EM) and whole-genome sequencing to determine the structures of type I and IV pili expressed in enterotoxigenic Escherichia coli. Well-defined cryo-EM maps at resolutions of 2.2 and 1.8 A for type I and IV pilus, respectively, facilitated the de novo structural modeling for these filaments, revealing side-chain structures in detail. We resolved thousands of hydrated water molecules around and within the inner core of the filaments, which stabilize the otherwise metastable quaternary subunit assembly. The high-resolution structures offer novel insights into subunit-subunit interactions, and provide important clues to understand pilus assembly, stability, and flexibility.

High-resolution cryo-EM analysis visualizes hydrated type I and IV pilus structures from enterotoxigenic Escherichia coli.,Kawahara K, Oki H, Iimori M, Muramoto R, Imai T, Gerle C, Shigematsu H, Matsuda S, Iida T, Nakamura S Structure. 2025 Apr 3:S0969-2126(25)00107-8. doi: 10.1016/j.str.2025.03.010. PMID:40220752^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.