9O0B

X-ray Crystal Structure of Fission Yeast Fsc1 protein in P43212

9O0B の概要

• エントリーDOI: 10.2210/pdb9o0b/pdb
• 関連するPDBエントリー: 9nu9
• 分子名称: FAS1 domain-containing protein fsc1 (2 entities in total)
• 機能のキーワード: fasciclin, fission yeast, autophagy, cell adhesion
• 由来する生物種: Schizosaccharomyces pombe (fission yeast)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 73788.89

構造登録者

Azuka, C.D.,Jin, X. (登録日: 2025-04-02, 公開日: 2026-04-01, 最終更新日: 2026-04-15)

主引用文献

Azuka, C.,Liu, J.,Jin, X.
Crystal structures of Fsc1, a novel autophagy factor that mediates autophagosome-vacuole fusion in fission yeast.
Acta Crystallogr D Struct Biol, 82:358-369, 2026

PubMed Abstract: Fsc1 is a recently identified autophagy factor in the fission yeast Schizosaccharomyces pombe that is implicated in the autophagosome-vacuole fusion step during the final stages of autophagy. Despite its critical role, the structural basis of Fsc1 function has remained unknown. Here, we report the first crystal structures of the luminal domain of Fsc1, revealing an elongated, modular architecture composed of five tandem fasciclin (FAS1) domains. Each domain adopts a hallmark β-sandwich fold, and the overall assembly forms a continuous scaffold featuring a conserved surface groove within the FAS1-4 domain. Structural and biochemical analyses demonstrate that Fsc1 forms a homodimer in solution through a shared interface observed in two independent crystal forms, supporting a biologically relevant but potentially low-affinity association. Comparative sequence and structural analyses reveal significant homology between Fsc1 and human fasciclin proteins, including TGFBI and periostin, suggesting similar structural principles underlying their functions. Together, these findings provide the first structural insights into Fsc1 and establish a structural framework for understanding how its modular architecture and context-dependent dimerization may facilitate late-stage membrane fusion during autophagy.

PubMed: 41879517
DOI: 10.1107/S205979832600197X

実験手法

X-RAY DIFFRACTION (2.504 Å)