期刊
SCIENCE
卷 359, 期 6375, 页码 537-544出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aar6401
关键词
-
资金
- National Natural Science Foundation of China [31621092, 31430020]
- Ministry of Science and Technology [2016YFA0501100]
Splicing by the spliceosome involves branching and exon ligation. The branching reaction leads to the formation of the catalytic step I spliceosome (C complex). Here we report the cryo-electron microscopy structure of the human C complex at an average resolution of 4.1 angstroms. Compared with the Saccharomyces cerevisiae C complex, the human complex contains 11 additional proteins. The step I splicing factors CCDC49 and CCDC94 (Cwc25 and Yju2 in S. cerevisiae, respectively) closely interact with the DEAH-family adenosine triphosphatase/helicase Prp16 and bridge the gap between Prp16 and the active-site RNA elements. These features, together with structural comparison of the human C and C* complexes, provide mechanistic insights into ribonucleoprotein remodeling and allow the proposition of a working mechanism for the C-to-C* transition.
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