7FAX

Complex structure of TbLeo1 and LW domain from Trypanosoma brucei

7FAX の概要

• エントリーDOI: 10.2210/pdb7fax/pdb
• 分子名称: TbLW, TbLeo1 peptide (3 entities in total)
• 機能のキーワード: lw, transcription, paf1c
• 由来する生物種: Trypanosoma brucei brucei TREU927; 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 14412.97

構造登録者

Liao, S.,Gao, J.,Tu, X. (登録日: 2021-07-07, 公開日: 2022-07-27, 最終更新日: 2024-11-13)

主引用文献

Gao, J.,Jishage, M.,Wang, Y.,Wang, R.,Chen, M.,Zhu, Z.,Zhang, J.,Diwu, Y.,Xu, C.,Liao, S.,Roeder, R.G.,Tu, X.
Structural basis for evolutionarily conserved interactions between TFIIS and Paf1C.
Int.J.Biol.Macromol., 253:126764-126764, 2023

PubMed Abstract: The elongation factor TFIIS interacts with Paf1C complex to facilitate processive transcription by Pol II. We here determined the crystal structure of the trypanosoma TFIIS LW domain in a complex with the LFG motif of Leo1, as well as the structures of apo-form TFIIS LW domains from trypanosoma, yeast and human. We revealed that all three TFIIS LW domains possess a conserved hydrophobic core that mediates their interactions with Leo1. Intriguingly, the structural study revealed that trypanosoma Leo1 binding induces the TFIIS LW domain to undergo a conformational change reflected in the length and orientation of α6 helix that is absent in the yeast and human counterparts. These differences explain the higher binding affinity of the TFIIS LW domain interacting with Leo1 in trypanosoma than in yeast and human, and indicate species-specific variations in the interactions. Importantly, the interactions between the TFIIS LW domain and an LFG motif of Leo1 were found to be critical for TFIIS to anchor the entire Paf1C complex. Thus, in addition to revealing a detailed structural basis for the TFIIS-Paf1C interaction, our studies also shed light on the origin and evolution of the roles of TFIIS and Paf1C complex in regulation of transcription elongation.

PubMed: 37696373
DOI: 10.1016/j.ijbiomac.2023.126764

実験手法

X-RAY DIFFRACTION (1.8 Å)