Abstract:
:Pre-mRNA 3' end formation is an essential step in eukaryotic gene expression. Over half of human genes produce alternatively polyadenylated mRNAs, suggesting that regulated polyadenylation is an important mechanism for posttranscriptional gene control. Although a number of mammalian mRNA 3' processing factors have been identified, the full protein composition of the 3' processing machinery has not been determined, and its structure is unknown. Here we report the purification and subsequent proteomic and structural characterization of human mRNA 3' processing complexes. Remarkably, the purified 3' processing complex contains approximately 85 proteins, including known and new core 3' processing factors and over 50 proteins that may mediate crosstalk with other processes. Electron microscopic analyses show that the core 3' processing complex has a distinct "kidney" shape and is approximately 250 A in length. Together, our data has revealed the complexity and molecular architecture of the pre-mRNA 3' processing complex.
journal_name
Mol Celljournal_title
Molecular cellauthors
Shi Y,Di Giammartino DC,Taylor D,Sarkeshik A,Rice WJ,Yates JR 3rd,Frank J,Manley JLdoi
10.1016/j.molcel.2008.12.028subject
Has Abstractpub_date
2009-02-13 00:00:00pages
365-76issue
3eissn
1097-2765issn
1097-4164pii
S1097-2765(09)00025-2journal_volume
33pub_type
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