TRM13/UPF0224 family, U11-48K-like CHHC zinc finger domain / : / U11-48K-like CHHC zinc finger / Zinc finger CHHC U11-48K-type profile. / U1-C, C2H2-type zinc finger / U1 zinc finger / Zinc finger C-x8-C-x5-C-x3-H type (and similar) / Small ribonucleoprotein associated, SmB/SmN / Small nuclear ribonucleoprotein D1 / Zinc finger, CCCH-type superfamily ...TRM13/UPF0224 family, U11-48K-like CHHC zinc finger domain / : / U11-48K-like CHHC zinc finger / Zinc finger CHHC U11-48K-type profile. / U1-C, C2H2-type zinc finger / U1 zinc finger / Zinc finger C-x8-C-x5-C-x3-H type (and similar) / Small ribonucleoprotein associated, SmB/SmN / Small nuclear ribonucleoprotein D1 / Zinc finger, CCCH-type superfamily / zinc finger / Small nuclear ribonucleoprotein Sm D3 / Small nuclear ribonucleoprotein Sm D2 / Small nuclear ribonucleoprotein E / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein F / Sm-like protein Lsm7/SmG / Like-Sm (LSM) domain containing protein, LSm4/SmD1/SmD3 / Sm-like protein Lsm6/SmF / Zinc finger, CCCH-type / Zinc finger C3H1-type profile. / LSM domain / LSM domain, eukaryotic/archaea-type / snRNP Sm proteins / : / Sm domain profile. / LSM domain superfamily / Zinc finger C2H2 superfamily 類似検索 - ドメイン・相同性
Small nuclear ribonucleoprotein-associated proteins B and B' / Small nuclear ribonucleoprotein E / Small nuclear ribonucleoprotein F / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein Sm D1 / Small nuclear ribonucleoprotein Sm D2 / Small nuclear ribonucleoprotein Sm D3 / U11/U12 small nuclear ribonucleoprotein 48 kDa protein / Zinc finger matrin-type protein 5 類似検索 - 構成要素
ジャーナル: Mol Cell / 年: 2025 タイトル: Structural basis of 5' splice site recognition by the minor spliceosome. 著者: Jiangfeng Zhao / Daniel Peter / Irina Brandina / Xiangyang Liu / Wojciech P Galej / 要旨: The minor spliceosome catalyzes excision of U12-dependent introns from precursors of eukaryotic messenger RNAs (pre-mRNAs). This process is critical for many cellular functions, but the underlying ...The minor spliceosome catalyzes excision of U12-dependent introns from precursors of eukaryotic messenger RNAs (pre-mRNAs). This process is critical for many cellular functions, but the underlying molecular mechanisms remain elusive. Here, we report a cryoelectron microscopy (cryo-EM) reconstruction of the 13-subunit human U11 small nuclear ribonucleoprotein particle (snRNP) complex in apo and substrate-bound forms, revealing the architecture of the U11 small nuclear RNA (snRNA), five minor spliceosome-specific factors, and the mechanism of the U12-type 5' splice site (5'SS) recognition. SNRNP25 and SNRNP35 specifically recognize U11 snRNA, while PDCD7 bridges SNRNP25 and SNRNP48, located at the distal ends of the particle. SNRNP48 and ZMAT5 are positioned near the 5' end of U11 snRNA and stabilize binding of the incoming 5'SS. Recognition of the U12-type 5'SS is achieved through base-pairing to the 5' end of the U11 snRNA and unexpected, non-canonical base-triple interactions with the U11 snRNA stem-loop 3. Our structures provide mechanistic insights into U12-dependent intron recognition and the evolution of the splicing machinery.