PRP4K

Serine/threonine kinase involved in spliceosomal assembly as well as mitosis and signaling regulation. Connects chromatin mediated regulation of transcription and pre-mRNA splicing. During spliceosomal assembly, interacts with and phosphorylates PRPF6 and PRPF31, components of the U4/U6-U5 tri-small nuclear ribonucleoprotein (snRNP), to facilitate the formation of the spliceosome B complex. Plays a role in regulating transcription and the spindle assembly checkpoint (SAC). Associates with U5 snRNP and NCOR1 deacetylase complexes which may allow a coordination of pre-mRNA splicing with chromatin remodeling events involved in transcriptional regulation. Associates and probably phosphorylates SMARCA4 and NCOR1. Phosphorylates SRSF1. Associates with kinetochores during mitosis and is necessary for recruitment and maintenance of the checkpoint proteins such as MAD1L1 and MAD12L1 at the kinetochores. Phosphorylates and regulates the activity of the transcription factors such as ELK1 and KLF13. Phosphorylates nuclear YAP1 and WWTR1/TAZ which induces nuclear exclusion and regulates Hippo signaling pathway, involved in tissue growth control..

Function from UniProtKB (Q13523), read 2026-09-23. CC BY 4.0.