SGD Paper Help


Page Contents:
Petroski MD and Deshaies RJ  (2005) Mechanism of lysine 48-linked ubiquitin-chain synthesis by the cullin-RING ubiquitin-ligase complex SCF-Cdc34. Cell 123(6):1107-20

Abstract: Ubiquitin chains linked via lysine 48 (K48) of ubiquitin mediate recognition of ubiquitinated proteins by the proteasome. However, the mechanisms underlying polymerization of this targeting signal on a substrate are unknown. Here we dissect this process using the cyclin-dependent kinase inhibitor Sic1 and its ubiquitination by the cullin-RING ubiquitin ligase SCF(Cdc4) and the ubiquitin-conjugating enzyme Cdc34. We show that Sic1 ubiquitination can be separated into two steps: attachment of the first ubiquitin, which is rate limiting, followed by rapid elongation of a K48-linked ubiquitin chain. Mutation of an acidic loop conserved among Cdc34 orthologs has no effect on attachment of the first ubiquitin onto Sic1 but compromises the processivity and linkage specificity of ubiquitin-chain synthesis. We propose that the acidic loop favorably positions K48 of a substrate-linked ubiquitin to attack SCF bound Cdc34 approximately ubiquitin thioester and thereby enables processive synthesis of K48-linked ubiquitin chains by SCF-Cdc34.

Status: Published Type: Journal Article | Research Support, Non-U.S. Gov't PubMed ID: 16360039

Topics addressed in this paper

Number of different genes curated to this paper: 7

  • 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
CDC34 CDC4 CDC53 HRT1 SIC1 SKP1 UBA1
Additional Literature blue ball
Function/Process blue ball blue ball blue ball blue ball blue ball blue ball
Mutants/Phenotypes blue ball blue ball
Primary Literature blue ball blue ball blue ball blue ball blue ball blue ball
Protein Physical Properties blue ball
Protein Processing/Modification/Regulation blue ball
Protein Sequence Features blue ball
Regulation of blue ball blue ball
Regulatory Role blue ball blue ball blue ball blue ball
Strains/Constructs blue ball blue ball
Substrates/Ligands/Cofactors blue ball blue ball blue ball blue ball blue ball blue ball
Techniques and Reagents blue ball blue ball blue ball blue ball

Author Searches

To find contact information or other publications by the authors of this paper, follow these three steps:
  1. (1) Choose an author,
  2. (2) Choose a search parameter,
  3. (3) Click to implement
Page Contents: