7Q83

Crystal structure of S. cerevisiae Sso2 in complex with the pleckstrin homology domain of Sec3

7Q83 の概要

• エントリーDOI: 10.2210/pdb7q83/pdb
• 分子名称: Exocyst complex component SEC3, Protein SSO2 (3 entities in total)
• 機能のキーワード: exocytosis, exocyst, membrane trafficking, protein complex, yeast
• 由来する生物種: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast); 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 120097.53

構造登録者

Zhang, Y.,Dong, G. (登録日: 2021-11-09, 公開日: 2022-08-31, 最終更新日: 2024-11-20)

主引用文献

Peer, M.,Yuan, H.,Zhang, Y.,Korbula, K.,Novick, P.,Dong, G.
Double NPY motifs at the N-terminus of the yeast t-SNARE Sso2 synergistically bind Sec3 to promote membrane fusion.
Elife, 11:-, 2022

PubMed Abstract: Exocytosis is an active vesicle trafficking process by which eukaryotes secrete materials to the extracellular environment and insert membrane proteins into the plasma membrane. The final step of exocytosis in yeast involves the assembly of two t-SNAREs, Sso1/2 and Sec9, with the v-SNARE, Snc1/2, on secretory vesicles. The rate-limiting step in this process is the formation of a binary complex of the two t-SNAREs. Despite a previous report of acceleration of binary complex assembly by Sec3, it remains unknown how Sso2 is efficiently recruited to the vesicle-docking site marked by Sec3. Here, we report a crystal structure of the pleckstrin homology (PH) domain of Sec3 in complex with a nearly full-length version of Sso2 lacking only its C-terminal transmembrane helix. The structure shows a previously uncharacterized binding site for Sec3 at the N-terminus of Sso2, consisting of two highly conserved triple residue motifs (NPY: Asn-Pro-Tyr). We further reveal that the two NPY motifs bind Sec3 synergistically, which together with the previously reported binding interface constitute dual-site interactions between Sso2 and Sec3 to drive the fusion of secretory vesicles at target sites on the plasma membrane.

PubMed: 35979953
DOI: 10.7554/eLife.82041

実験手法

X-RAY DIFFRACTION (2.19 Å)