snRNA-activating protein complex / snRNA transcription / snRNA transcription by RNA polymerase III / bent DNA binding / RNA polymerase III type 3 promoter sequence-specific DNA binding / snRNA transcription by RNA polymerase II / RNA polymerase III general transcription initiation factor activity / RNA Polymerase III Transcription Initiation From Type 3 Promoter / RNA Polymerase III Abortive And Retractive Initiation / RNA polymerase II general transcription initiation factor activity ...snRNA-activating protein complex / snRNA transcription / snRNA transcription by RNA polymerase III / bent DNA binding / RNA polymerase III type 3 promoter sequence-specific DNA binding / snRNA transcription by RNA polymerase II / RNA polymerase III general transcription initiation factor activity / RNA Polymerase III Transcription Initiation From Type 3 Promoter / RNA Polymerase III Abortive And Retractive Initiation / RNA polymerase II general transcription initiation factor activity / transcription by RNA polymerase III / RNA polymerase II transcribes snRNA genes / sequence-specific DNA binding / transcription by RNA polymerase II / nuclear body / nucleolus / DNA binding / nucleoplasm / nucleus 類似検索 - 分子機能
snRNA-activating protein complex subunit 1 / snRNA-activating protein complex, subunit 3 / Small nuclear RNA activating complex (SNAPc), subunit 1 / snRNA-activating protein complex (SNAPc), subunit 3 / : / Myb-like domain profile. / Myb-like DNA-binding domain / Myb-type HTH DNA-binding domain profile. / Myb domain / SANT domain ...snRNA-activating protein complex subunit 1 / snRNA-activating protein complex, subunit 3 / Small nuclear RNA activating complex (SNAPc), subunit 1 / snRNA-activating protein complex (SNAPc), subunit 3 / : / Myb-like domain profile. / Myb-like DNA-binding domain / Myb-type HTH DNA-binding domain profile. / Myb domain / SANT domain / SANT SWI3, ADA2, N-CoR and TFIIIB'' DNA-binding domains / SANT/Myb domain / Homeobox-like domain superfamily 類似検索 - ドメイン・相同性
snRNA-activating protein complex subunit 1 / snRNA-activating protein complex subunit 4 / snRNA-activating protein complex subunit 3 類似検索 - 構成要素
National Natural Science Foundation of China (NSFC)
32171207
中国
National Natural Science Foundation of China (NSFC)
31970584
中国
National Natural Science Foundation of China (NSFC)
32000857
中国
引用
ジャーナル: Nat Commun / 年: 2022 タイトル: Structural basis of human SNAPc recognizing proximal sequence element of snRNA promoter. 著者: Jianfeng Sun / Xue Li / Xuben Hou / Sujian Cao / Wenjin Cao / Ye Zhang / Jinyang Song / Manfu Wang / Hao Wang / Xiaodong Yan / Zengpeng Li / Robert G Roeder / Wei Wang / 要旨: In eukaryotes, small nuclear RNAs (snRNAs) function in many fundamental cellular events such as precursor messenger RNA splicing, gene expression regulation, and ribosomal RNA processing. The snRNA ...In eukaryotes, small nuclear RNAs (snRNAs) function in many fundamental cellular events such as precursor messenger RNA splicing, gene expression regulation, and ribosomal RNA processing. The snRNA activating protein complex (SNAPc) exclusively recognizes the proximal sequence element (PSE) at snRNA promoters and recruits RNA polymerase II or III to initiate transcription. In view that homozygous gene-knockout of SNAPc core subunits causes mouse embryonic lethality, functions of SNAPc are almost housekeeping. But so far, the structural insight into how SNAPc assembles and regulates snRNA transcription initiation remains unclear. Here we present the cryo-electron microscopy structure of the essential part of human SNAPc in complex with human U6-1 PSE at an overall resolution of 3.49 Å. This structure reveals the three-dimensional features of three conserved subunits (N-terminal domain of SNAP190, SNAP50, and SNAP43) and explains how they are assembled into a stable mini-SNAPc in PSE-binding state with a "wrap-around" mode. We identify three important motifs of SNAP50 that are involved in both major groove and minor groove recognition of PSE, in coordination with the Myb domain of SNAP190. Our findings further elaborate human PSE sequence conservation and compatibility for SNAPc recognition, providing a clear framework of snRNA transcription initiation, especially the U6 system.