2P63

Suprafacial orientation of the SCFCdc4 dimer accommodates multiple geometries for substrate ubiquitination

2P63 の概要

• エントリーDOI: 10.2210/pdb2p63/pdb
• 分子名称: Cell division control protein 4 (2 entities in total)
• 機能のキーワード: ubiquitination, helix bundle, scf complex, cell cycle
• 由来する生物種: Saccharomyces cerevisiae (baker's yeast)
• 細胞内の位置: Nucleus: P07834
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 25719.77

構造登録者

Orlicky, S.,Neculai, D.,Ceccarelli, D. (登録日: 2007-03-16, 公開日: 2007-06-19, 最終更新日: 2024-11-06)

主引用文献

Tang, X.,Orlicky, S.,Lin, Z.,Willems, A.,Neculai, D.,Ceccarelli, D.,Mercurio, F.,Shilton, B.H.,Sicheri, F.,Tyers, M.
Suprafacial orientation of the SCFCdc4 dimer accommodates multiple geometries for substrate ubiquitination.
Cell(Cambridge,Mass.), 129:1165-1176, 2007

PubMed Abstract: SCF ubiquitin ligases recruit substrates for degradation via F box protein adaptor subunits. WD40 repeat F box proteins, such as Cdc4 and beta-TrCP, contain a conserved dimerization motif called the D domain. Here, we report that the D domain protomers of yeast Cdc4 and human beta-TrCP form a superhelical homotypic dimer. Disruption of the D domain compromises the activity of yeast SCF(Cdc4) toward the CDK inhibitor Sic1 and other substrates. SCF(Cdc4) dimerization has little effect on the affinity for Sic1 but markedly stimulates ubiquitin conjugation. A model of the dimeric holo-SCF(Cdc4) complex based on small-angle X-ray scatter measurements reveals a suprafacial configuration, in which substrate-binding sites and E2 catalytic sites lie in the same plane with a separation of 64 A within and 102 A between each SCF monomer. This spatial variability may accommodate diverse acceptor lysine geometries in both substrates and the elongating ubiquitin chain and thereby increase catalytic efficiency.

PubMed: 17574027
DOI: 10.1016/j.cell.2007.04.042

実験手法

X-RAY DIFFRACTION (2.67 Å)