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Protein IWS1 homolog (IWS1)
- Target
- IWS1
- Molecular classification
- Transcription factor, RNA Polymerase II elongation complex assembly factor, Chromatin regulator (co-transcriptional histone modification)
01
Overview
Protein IWS1 homolog (IWS1) is a transcription elongation factor that defines the composition of the RNA polymerase II (RNAPII) elongation complex. It acts as an assembly factor to recruit mRNA export and splicing factors (ALYREF/THOC4, EXOSC10) and the histone modifying enzyme SETD2 to the elongation complex via its binding to SUPT6H, which itself is bound to the CTD of RNAPII. This facilitates efficient mRNA processing and export, as well as elongation-coupled H3K36 trimethylation—a signature chromatin mark of active transcription. IWS1 interactions are essential for proper pre-mRNA splicing, mRNA export, and cell viability. Loss or depletion of IWS1 impairs embryonic development, with major developmental arrest in model systems such as mouse embryos. While it is not a classical receptor or enzyme drug target, it is considered a critical regulatory node in gene expression and chromatin biology.
- Other names
- IWS1IWS1LDKFZp761G0123FLJ10006FLJ14655FLJ32319IWS1-like proteinprotein IWS1 homologIWS1 homologSUPT6H interacting proteininteracts with Spt6interacts with SUPT6H, CTD assembly factor 1
02
Mechanism of action
Not applicable—drugs targeting this molecule/mechanism are currently unknown or unpublished
03
Biological functions
Regulation of mRNA export from nucleusRegulation of mRNA processing/splicingTranscription elongation-coupled chromatin remodeling (including H3K36 trimethylation via SETD2 recruitment)Recruitment and assembly of mRNA processing/export factors and histone modifiers to the elongation complex
04
Disease associations
Cancer (loss of function or alteration can impact gene expression profiles relevant for cancer biology)Embryonic development (required for cell viability during early embryonic genome activation; knockdown blocks embryo development)Other: general roles in fundamental gene expression pathways, but not directly implicated in inflammation, neurodegeneration, or infection
05
Safety considerations
Not applicable—since IWS1 is essential for cell viability and embryonic development, targeting it could disrupt fundamental cellular processes and result in off-target toxicities
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