Partial (52mer) encapsulin shell assembly from Mycobacterium tuberculosis
要素
Type 1 encapsulin shell protein
キーワード
VIRUS LIKE PARTICLE / encapsulin
機能・相同性
Type 1 encapsulin shell protein / Encapsulating protein for peroxidase / : / encapsulin nanocompartment / extracellular region / plasma membrane / Type 1 encapsulin shell protein
Netherlands Organisation for Scientific Research (NWO)
184.034.014
オランダ
Other government
LHSM18067
引用
ジャーナル: Commun Biol / 年: 2025 タイトル: In situ and in vitro cryo-EM reveal structures of mycobacterial encapsulin assembly intermediates. 著者: Casper Berger / Chris Lewis / Ye Gao / Kèvin Knoops / Carmen López-Iglesias / Peter J Peters / Raimond B G Ravelli / 要旨: Prokaryotes rely on proteinaceous compartments such as encapsulin to isolate harmful reactions. Encapsulin are widely expressed by bacteria, including the Mycobacteriaceae, which include the human ...Prokaryotes rely on proteinaceous compartments such as encapsulin to isolate harmful reactions. Encapsulin are widely expressed by bacteria, including the Mycobacteriaceae, which include the human pathogens Mycobacterium tuberculosis and Mycobacterium leprae. Structures of fully assembled encapsulin shells have been determined for several species, but encapsulin assembly and cargo encapsulation are still poorly characterised, because of the absence of encapsulin structures in intermediate assembly states. We combine in situ and in vitro structural electron microscopy to show that encapsulins are dynamic assemblies with intermediate states of cargo encapsulation and shell assembly. Using cryo-focused ion beam (FIB) lamella preparation and cryo-electron tomography (CET), we directly visualise encapsulins in Mycobacterium marinum, and observed ribbon-like attachments to the shell, encapsulin shells with and without cargoes, and encapsulin shells in partially assembled states. In vitro cryo-electron microscopy (EM) single-particle analysis of the Mycobacterium tuberculosis encapsulin was used to obtain three structures of the encapsulin shell in intermediate states, as well as a 2.3 Å structure of the fully assembled shell. Based on the analysis of the intermediate encapsulin shell structures, we propose a model of encapsulin self-assembly via the pairwise addition of monomers.
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