ASC1/YMR116C Summary Help

Standard Name ASC1 1
Systematic Name YMR116C
Alias CPC2 2 , NAD1 3 , ASU9 4
Feature Type ORF, Verified
Description G-protein beta subunit and guanine dissociation inhibitor for Gpa2p; ortholog of RACK1 that inhibits translation; core component of the small (40S) ribosomal subunit; regulates P-body formation induced by replication stress; represses Gcn4p in the absence of amino acid starvation (1, 2, 5, 6, 7 and see Summary Paragraph)
Name Description Absence of growth Suppressor of Cyp1 1
Chromosomal Location
ChrXIII:500688 to 499456 | ORF Map | GBrowse
Note: this feature is encoded on the Crick strand.
Gbrowse
Gene Ontology Annotations All ASC1 GO evidence and references
  View Computational GO annotations for ASC1
Molecular Function
Manually curated
Biological Process
Manually curated
Cellular Component
Manually curated
High-throughput
Regulators 12 genes
Resources
Classical genetics
null
Large-scale survey
null
Resources
315 total interaction(s) for 270 unique genes/features.
Physical Interactions
  • Affinity Capture-MS: 87
  • Affinity Capture-RNA: 5
  • Affinity Capture-Western: 5
  • Co-crystal Structure: 1
  • Co-purification: 2
  • PCA: 1
  • Reconstituted Complex: 3
  • Two-hybrid: 4

Genetic Interactions
  • Negative Genetic: 143
  • Phenotypic Enhancement: 2
  • Phenotypic Suppression: 2
  • Positive Genetic: 30
  • Synthetic Growth Defect: 21
  • Synthetic Lethality: 6
  • Synthetic Rescue: 3

Resources
Expression Summary
histogram
Resources
Length (a.a.) 319
Molecular Weight (Da) 34,805
Isoelectric Point (pI) 6.17
Localization
Phosphorylation PhosphoGRID | PhosphoPep Database
Structure
Homologs
sequence information
ChrXIII:500688 to 499456 | ORF Map | GBrowse
Note: this feature is encoded on the Crick strand.
This feature contains embedded feature(s): SNR24
SGD ORF map
Last Update Coordinates: 2011-02-03 | Sequence: 1996-07-31
Subfeature details
Relative
Coordinates
Chromosomal
Coordinates
Most Recent Updates
Coordinates Sequence
CDS 1..537 500688..500152 2011-02-03 1996-07-31
Intron 538..810 500151..499879 2011-02-03 1996-07-31
CDS 811..1233 499878..499456 2011-02-03 1996-07-31
Retrieve sequences
Analyze Sequence
S288C only
S288C vs. other species
S288C vs. other strains
Resources
External Links All Associated Seq | Entrez Gene | Entrez RefSeq Protein | MIPS | Search all NCBI (Entrez) | UniProtKB
Primary SGDIDS000004722
SUMMARY PARAGRAPH for ASC1

About yeast ribosomes...

Ribosomes are highly conserved large ribonucleoprotein (RNP) particles, consisting in yeast of a large 60S subunit and a small 40S subunit, that perform protein synthesis. Yeast ribosomes contain one copy each of four ribosomal RNAs (5S, 5.8S, 18S, and 25S; produced in two separate transcripts encoded within the rDNA repeat present as hundreds of copies on Chromosome 12) and 79 different ribosomal proteins (r-proteins), which are encoded by 137 different genes scattered about the genome, 59 of which are duplicated (8, 9). The 60S subunit contains 46 proteins and three RNA molecules: 25S RNA of 3392 nt, hydrogen bonded to the 5.8S RNA of 158 nt and associated with the 5S RNA of 121 nt. The 40S subunit has a single 18S RNA of 1798 nt and 33 proteins (10, 9). All yeast ribosomal proteins have a mammalian homolog (11).

In a rapidly growing yeast cell, 60% of total transcription is devoted to ribosomal RNA, and 50% of RNA polymerase II transcription and 90% of mRNA splicing are devoted to the production of mRNAs for r-proteins. Coordinate regulation of the rRNA genes and 137 r-protein genes is affected by nutritional cues and a number of signal transduction pathways that can abruptly induce or silence the ribosomal genes, whose transcripts have naturally short lifetimes, leading to major implications for the expression of other genes as well (12, 13, 14). The expression of some r-protein genes is influenced by Abf1p (15), and most are directly induced by binding of Rap1p to their promoters, which excludes nucleosomes and recruits Fhl1p and Ifh1p to drive transcription (16).

Ribosome assembly is a complex process, with different steps occurring in different parts of the cell. Ribosomal protein genes are transcribed in the nucleus, and the mRNA is transported to the cytoplasm for translation. The newly synthesized r-proteins then enter the nucleus and associate in the nucleolus with the two rRNA transcripts, one of which is methylated and pseudouridylated (view sites of modifications), and then cleaved into three individual rRNAs (18S, 5.8S, and 25S) as part of the assembly process (8). Separate ribosomal subunits are then transported from the nucleolus to the cytoplasm where they assemble into mature ribosomes before functioning in translation (17, 18). Blockage of subunit assembly, such as due to inhibition of rRNA synthesis or processing, results in degradation of newly synthesized r-proteins (19, 18). (For more information on the early steps of rRNA processing and small ribosomal subunit assembly, see the summary paragraph for the U3 snoRNA, encoded by snR17A and snR17B.)

Last updated: 2014-06-20 Contact SGD

References cited on this page View Complete Literature Guide for ASC1
1) Chantrel Y, et al.  (1998) The transcriptional regulator Hap1p (Cyp1p) is essential for anaerobic or heme-deficient growth of Saccharomyces cerevisiae: Genetic and molecular characterization of an extragenic suppressor that encodes a WD repeat protein. Genetics 148(2):559-69
2) Hoffmann B, et al.  (1999) The WD protein Cpc2p is required for repression of Gcn4 protein activity in yeast in the absence of amino-acid starvation. Mol Microbiol 31(3):807-22
3) Kuroha K, et al.  (2010) Receptor for activated C kinase 1 stimulates nascent polypeptide-dependent translation arrest. EMBO Rep 11(12):956-61
4) Derkatch I and Liebman S  (2014) personal communication
5) Gerbasi VR, et al.  (2004) Yeast Asc1p and mammalian RACK1 are functionally orthologous core 40S ribosomal proteins that repress gene expression. Mol Cell Biol 24(18):8276-87
6) Zeller CE, et al.  (2007) The RACK1 ortholog Asc1 functions as a G-protein beta subunit coupled to glucose responsiveness in yeast. J Biol Chem 282(34):25168-76
7) Tkach JM, et al.  (2012) Dissecting DNA damage response pathways by analysing protein localization and abundance changes during DNA replication stress. Nat Cell Biol 14(9):966-76
8) Venema J and Tollervey D  (1999) Ribosome synthesis in Saccharomyces cerevisiae. Annu Rev Genet 33:261-311
9) Jenner L, et al.  (2012) Crystal structure of the 80S yeast ribosome. Curr Opin Struct Biol 22(6):759-67
10) Verschoor A, et al.  (1998) Three-dimensional structure of the yeast ribosome. Nucleic Acids Res 26(2):655-61
11) Mager WH, et al.  (1997) A new nomenclature for the cytoplasmic ribosomal proteins of Saccharomyces cerevisiae. Nucleic Acids Res 25(24):4872-5
12) Li B, et al.  (1999) Transcriptional elements involved in the repression of ribosomal protein synthesis. Mol Cell Biol 19(8):5393-404
13) Zhao Y, et al.  (2003) Autoregulation in the biosynthesis of ribosomes. Mol Cell Biol 23(2):699-707
14) Warner JR  (1999) The economics of ribosome biosynthesis in yeast. Trends Biochem Sci 24(11):437-40
15) Mager WH and Planta RJ  (1990) Multifunctional DNA-binding proteins mediate concerted transcription activation of yeast ribosomal protein genes. Biochim Biophys Acta 1050(1-3):351-5
16) Zhao Y, et al.  (2006) Fine-structure analysis of ribosomal protein gene transcription. Mol Cell Biol 26(13):4853-62
17) Moritz M, et al.  (1990) Depletion of yeast ribosomal proteins L16 or rp59 disrupts ribosome assembly. J Cell Biol 111(6 Pt 1):2261-74
18) Milgrom E, et al.  (2007) Loss of vacuolar proton-translocating ATPase activity in yeast results in chronic oxidative stress. J Biol Chem 282(10):7125-36
19) Wang S, et al.  (2007) Influence of Substrate Conformation on the Deglycosylation of Ribonuclease B by Recombinant Yeast Peptide:N-glycanase. Acta Biochim Biophys Sin (Shanghai) 39(1):8-14