Download MendeleyIntrinsically disordered CsoS2 acts as a general molecular thread for alpha-carboxysome shell assembly.
Ni, T., Jiang, Q., Ng, P.C., Shen, J., Dou, H., Zhu, Y., Radecke, J., Dykes, G.F., Huang, F., Liu, L.N., Zhang, P.(2023) Nat Commun 14: 5512-5512
- PubMed: 37679318
- DOI: https://doi.org/10.1038/s41467-023-41211-y
- Primary Citation of Related Structures:
8B0Y, 8B11, 8B12 - PubMed Abstract:
Carboxysomes are a paradigm of self-assembling proteinaceous organelles found in nature, offering compartmentalisation of enzymes and pathways to enhance carbon fixation. In α-carboxysomes, the disordered linker protein CsoS2 plays an essential role in carboxysome assembly and Rubisco encapsulation. Its mechanism of action, however, is not fully understood. Here we synthetically engineer α-carboxysome shells using minimal shell components and determine cryoEM structures of these to decipher the principle of shell assembly and encapsulation. The structures reveal that the intrinsically disordered CsoS2 C-terminus is well-structured and acts as a universal "molecular thread" stitching through multiple shell protein interfaces. We further uncover in CsoS2 a highly conserved repetitive key interaction motif, [IV]TG, which is critical to the shell assembly and architecture. Our study provides a general mechanism for the CsoS2-governed carboxysome shell assembly and cargo encapsulation and further advances synthetic engineering of carboxysomes for diverse biotechnological applications.
Organizational Affiliation:
Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK. taoni@hku.hk.
