TAF9B Inhibitors

TAF9B inhibitors pertain to a class of chemical compounds designed to modulate the activity of the transcription initiation factor TFIID subunit 9B (TAF9B), which is a protein in humans encoded by the TAF9B gene. This protein plays a crucial role in the initiation of transcription by RNA polymerase II, requiring the activities of over 70 polypeptides for this function. TAF9B coordinates these activities by binding to the core promoter, positioning the polymerase properly, serving as the scaffold for the assembly of the remainder of the transcription complex, and acting as a channel for regulatory signals 1. Furthermore, TAF9B is involved in transcriptional activation as well as repression of distinct but overlapping sets of genes, potentially having a role in gene regulation associated with apoptosis 2. The mechanism of TAF9B's interaction with other molecular entities is complex. For instance, it binds to both promoters and distal enhancers of neuronal genes, partially co-localizing at binding sites of OLIG2, a key activator of motor neuron differentiation. In a neuronal context, TAF9B becomes preferentially associated with PCAF rather than the canonical TFIID complex 3. The inhibition of TAF9B can be achieved through various molecular interactions. For example, miR-7-5p can bind to the 3'UTR region of TAF9B, downregulating its expression in certain cell types and thus inhibiting its apoptotic suppression activity by altering the expression of Bcl-2, Bax, and Cleaved-caspase-3 4.