SGD Paper 
DeMarini DJ, et al. (1995) The yeast SEN3 gene encodes a regulatory subunit of the 26S proteasome complex required for ubiquitin-dependent protein degradation in vivo. Mol Cell Biol 15(11):6311-21
Abstract: The yeast Sen1 protein was discovered by virtue of its role in tRNA splicing in vitro. To help determine the role of Sen1 in vivo, we attempted to overexpress the protein in yeast cells. However, cells witha high-copy SEN1-bearing plasmid, although expressing elevated amounts of SEN1 mRNA, show little increase in the level of the encoded protein, indicating that a posttranscriptional mechanism limits SEN1 expression. This control depends on an amino-terminal element of Sen1. Using a genetic selection for mutants with increased expression of Sen1-derived fusion proteins, we identified mutations in a novel gene, designated SEN3. SEN3 is essential and encodes a 945-residue protein with sequence similarity to a subunit of an activator of the 20S proteasome from bovine erythrocytes, called PA700. Earlier work indicated that the 20S proteasome associates with a multisubunit regulatory factor, resulting in a 26S proteasome complex that degrades substrates of the ubiquitin system. Mutant sen3-1 cells have severe defects in the degradation of such substrates and accumulate ubiquitin-protein conjugates. Most importantly, we show biochemically that Sen3 is a subunit of the 26S proteasome. These data provide evidence for the involvement of the 26S proteasome in the degradation of ubiquitinated proteins in vivo and for a close relationship between PA700 and the regulatory complexes within the 26S proteasome, and they directly demonstrate that Sen3 is a component of the yeast 26S proteasome.
| Status: Published | Type: Journal Article | PubMed ID: 7565784 |
Topics addressed in this paper
Number of different genes curated to this paper: 2
- To find other papers on a gene and topic, click on the colored ball in the appropriate box.
- displays other papers with information about that topic for that gene.
- displays other papers in SGD that are associated with that topic.
The topic is addressed in these papers but does not describe a specific gene or chromosomal feature.
- To go to the Locus page for a gene, click on the gene name.
| Topics | Genes linked to topics | |
|---|---|---|
| RPN2 | SEN1 | |
| DNA/RNA Sequence Features |  | |
| Function/Process | | |
| Genetic Interactions | | |
| Mutants/Phenotypes | | |
| Non-Fungal Related Genes/Proteins | | |
| Primary Literature | | |
| Protein Processing/Modification/Regulation | | |
| Protein Sequence Features | | |
| Protein-protein Interactions | | |
| Regulation of | | |
| Regulatory Role | | |
| Strains/Constructs | | |
