Download MendeleyCryo-EM structure of Mycobacterium smegmatis DyP-loaded encapsulin.
Tang, Y., Mu, A., Zhang, Y., Zhou, S., Wang, W., Lai, Y., Zhou, X., Liu, F., Yang, X., Gong, H., Wang, Q., Rao, Z.(2021) Proc Natl Acad Sci U S A 118
- PubMed: 33853951
- DOI: https://doi.org/10.1073/pnas.2025658118
- Primary Citation of Related Structures:
7BOJ, 7BOK - PubMed Abstract:
Encapsulins containing dye-decolorizing peroxidase (DyP)-type peroxidases are ubiquitous among prokaryotes, protecting cells against oxidative stress. However, little is known about how they interact and function. Here, we have isolated a native cargo-packaging encapsulin from Mycobacterium smegmatis and determined its complete high-resolution structure by cryogenic electron microscopy (cryo-EM). This encapsulin comprises an icosahedral shell and a dodecameric DyP cargo. The dodecameric DyP consists of two hexamers with a twofold axis of symmetry and stretches across the interior of the encapsulin. Our results reveal that the encapsulin shell plays a role in stabilizing the dodecameric DyP. Furthermore, we have proposed a potential mechanism for removing the hydrogen peroxide based on the structural features. Our study also suggests that the DyP is the primary cargo protein of mycobacterial encapsulins and is a potential target for antituberculosis drug discovery.
Organizational Affiliation:
State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for Cell Responses, College of Life Sciences, Nankai University, 300353 Tianjin, China.
