The human 64-kDa polyadenylylation factor contains a ribonucleoprotein-type RNA binding domain and unusual auxiliary motifs - PubMed (original) (raw)
The human 64-kDa polyadenylylation factor contains a ribonucleoprotein-type RNA binding domain and unusual auxiliary motifs
Y Takagaki et al. Proc Natl Acad Sci U S A. 1992.
Abstract
Cleavage stimulation factor is one of the multiple factors required for 3'-end cleavage of mammalian pre-mRNAs. We have shown previously that this factor is composed of three subunits with estimated molecular masses of 77, 64, and 50 kDa and that the 64-kDa subunit can be UV-crosslinked to RNA in a polyadenylylation signal (AAUAAA)-dependent manner. We have now isolated cDNAs encoding the 64-kDa subunit of human cleavage stimulation factor. The 64-kDa subunit contains a ribonucleoprotein-type RNA binding domain in the N-terminal region and a repeat structure in the C-terminal region in which a pentapeptide sequence (consensus MEARA/G) is repeated 12 times and the formation of a long alpha-helix stabilized by salt bridges is predicted. An approximately 270-amino acid segment surrounding this repeat structure is highly enriched in proline and glycine residues (approximately 20% for each). When cloned 64-kDa subunit was expressed in Escherichia coli, an N-terminal fragment containing the RNA binding domain bound to RNAs in a polyadenylylation-signal-independent manner, suggesting that the RNA binding domain is directly involved in the binding of the 64-kDa subunit to pre-mRNAs.
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