Download MendeleyStructures of the fully assembledSaccharomyces cerevisiaespliceosome before activation
Bai, R., Wan, R., Yan, C., Lei, J., Shi, Y.(2018) Science 360: 1423-1429
- PubMed: 29794219
- DOI: https://doi.org/10.1126/science.aau0325
- Primary Citation of Related Structures:
5ZWM, 5ZWN, 5ZWO - PubMed Abstract:
The precatalytic spliceosome (B complex) is preceded by the pre-B complex. Here we report the cryo-electron microscopy structures of the Saccharomyces cerevisiae pre-B and B complexes at average resolutions of 3.3 to 4.6 and 3.9 angstroms, respectively. In the pre-B complex, the duplex between the 5' splice site (5'SS) and U1 small nuclear RNA (snRNA) is recognized by Yhc1, Luc7, and the Sm ring. In the B complex, U1 small nuclear ribonucleoprotein is dissociated, the 5'-exon-5'SS sequences are translocated near U6 snRNA, and three B-specific proteins may orient the precursor messenger RNA. In both complexes, U6 snRNA is anchored to loop I of U5 snRNA, and the duplex between the branch point sequence and U2 snRNA is recognized by the SF3b complex. Structural analysis reveals the mechanism of assembly and activation for the yeast spliceosome.
Organizational Affiliation:
Beijing Advanced Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, Schools of Life Sciences and Medicine, Tsinghua University, Beijing 100084, China.
