Domain interactions within the Ski2/3/8 complex and between the Ski complex and Ski7p
Open Access
- 25 July 2005
- journal article
- Published by Cold Spring Harbor Laboratory in RNA
- Vol. 11 (8), 1291-1302
- https://doi.org/10.1261/rna.2060405
Abstract
The Ski complex (composed of Ski3p, Ski8p, and the DEVH ATPase Ski2p) is a central component of the 3′–5′ cytoplasmic mRNA degradation pathway in yeast. Although the proteins of the complex interact with each other as well as with Ski7p to mediate degradation by exosome, a 3′-exonuclease complex, the nature of these interactions is not well understood. Here we explore interactions within the Ski complex and between the Ski complex and Ski7p using a directed two-hybrid approach combined with coimmunoprecipitation experiments. We also test the functional significance of these interactions in vivo. Our results suggest that within the Ski complex, Ski3p serves as a scaffold protein with its C terminus interacting with Ski8p, and the sub-C terminus interacting with Ski2p, while no direct interaction between Ski2p and Ski8p was found. Ski7p interacts with the Ski complex via its interaction with Ski8p and Ski3p. In addition, inactivating the Ski complex by mutating conserved residues in the DEVH helicase motif of Ski2 did not abrogate its interaction with Ski7p, indicating that Ski2p function is not necessary for this interaction.Keywords
This publication has 33 references indexed in Scilit:
- Crystal structure of Ski8p, a WD‐repeat protein with dual roles in mRNA metabolism and meiotic recombinationProtein Science, 2004
- The structure of Ski8p, a protein regulating mRNA degradation: Implications for WD protein structureProtein Science, 2004
- Structure-Based Assembly of Protein Complexes in YeastScience, 2004
- An mRNA Surveillance Mechanism That Eliminates Transcripts Lacking Termination CodonsScience, 2002
- Exosome-Mediated Recognition and Degradation of mRNAs Lacking a Termination CodonScience, 2002
- Functional Link between the Mammalian Exosome and mRNA DecappingCell, 2001
- Ski7p G protein interacts with the exosome and the Ski complex for 3'-to-5' mRNA decay in yeastThe EMBO Journal, 2001
- The 3' to 5' degradation of yeast mRNAs is a general mechanism for mRNA turnover that requires the SKI2 DEVH box protein and 3' to 5' exonucleases of the exosome complexThe EMBO Journal, 1998
- RNA turnover: The helicase story unwindsCurrent Biology, 1996
- Premature translational termination triggers mRNA decappingNature, 1994