8QO9

Cryo-EM structure of a human spliceosomal B complex protomer

これはPDB形式変換不可エントリーです。

8QO9 の概要

• エントリーDOI: 10.2210/pdb8qo9/pdb
• EMDBエントリー: 18529
• 分子名称: Splicing factor 3B subunit 4, Splicing factor 3B subunit 6, U6 snRNA-associated Sm-like protein LSm2, ... (53 entities in total)
• 機能のキーワード: spliceosome, splicing
• 由来する生物種: Homo sapiens (human); 詳細
• タンパク質・核酸の鎖数: 71
• 化学式量合計: 3162167.65

構造登録者

Zhang, Z.,Kumar, V.,Dybkov, O.,Will, C.L.,Urlaub, H.,Stark, H.,Luehrmann, R. (登録日: 2023-09-28, 公開日: 2024-01-24, 最終更新日: 2025-07-09)

主引用文献

Zhang, Z.,Kumar, V.,Dybkov, O.,Will, C.L.,Urlaub, H.,Stark, H.,Luhrmann, R.
Cryo-EM analyses of dimerized spliceosomes provide new insights into the functions of B complex proteins.
Embo J., 43:1065-1088, 2024

PubMed Abstract: The B complex is a key intermediate stage of spliceosome assembly. To improve the structural resolution of monomeric, human spliceosomal B (hB) complexes and thereby generate a more comprehensive hB molecular model, we determined the cryo-EM structure of B complex dimers formed in the presence of ATP S. The enhanced resolution of these complexes allows a finer molecular dissection of how the 5' splice site (5'ss) is recognized in hB, and new insights into molecular interactions of FBP21, SNU23 and PRP38 with the U6/5'ss helix and with each other. It also reveals that SMU1 and RED are present as a heterotetrameric complex and are located at the interface of the B dimer protomers. We further show that MFAP1 and UBL5 form a 5' exon binding channel in hB, and elucidate the molecular contacts stabilizing the 5' exon at this stage. Our studies thus yield more accurate models of protein and RNA components of hB complexes. They further allow the localization of additional proteins and protein domains (such as SF3B6, BUD31 and TCERG1) whose position was not previously known, thereby uncovering new functions for B-specific and other hB proteins during pre-mRNA splicing.

PubMed: 38383864
DOI: 10.1038/s44318-024-00052-1

実験手法

ELECTRON MICROSCOPY (5.29 Å)