Download MendeleyThe structural and functional analysis of mycobacteria cysteine desulfurase-loaded encapsulin.
Tang, Y., Liu, Y., Zhang, M., Lan, W., Ma, M., Chen, C., Wu, S., Chen, R., Yan, Y., Feng, L., Li, Y., Guddat, L.W., Gao, Y., Liu, X., Rao, Z.(2024) Commun Biol 7: 1656-1656
- PubMed: 39702509
- DOI: https://doi.org/10.1038/s42003-024-07299-8
- Primary Citation of Related Structures:
8WOL, 8WON - PubMed Abstract:
Encapsulin nanocompartments loaded with dedicated cargo proteins via unique targeting peptides, play a key role in stress resistance, iron storage and natural product biosynthesis. Mmp1 and cysteine desulfurase (Enc-CD) have been identified as the most abundant representatives of family 2 encapsulin systems. However, the molecular assembly, catalytic mechanism, and physiological functions of the Mmp1 encapsulin system have not been studied in detail. Here we isolate and characterize an Enc-CD-loaded Mmp1 encapsulin system from Mycobacterium smegmatis mc 2 155. The cryo-EM structure of the Mmp1 encapsulin and the crystal structure of the naked cargo Enc-CD have been determined. The structure shows that the Mmp1 protomer assembles two conformation models, the icosahedron (T = 1) and homodecamer, with the resolution of 2.60 Å and 2.69 Å. The Enc-CD at 2.10 Å resolution is dimeric and loaded into the Mmp1 (T = 1) encapsulin through the N-terminal long disordered region. Mmp1 encapsulin protects Enc-CD against oxidation as well as to maintain structural stability. These studies provide new insights into the mechanism by which Enc-CD-loaded encapsulin stores sulfur and provides a framework for discovery of new anti-mycobacterial therapeutics.
Organizational Affiliation:
College of Life Sciences, State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for Cell Responses, Nankai University, Tianjin, China.
