How Are Transcription Factors Activated

Transcription factor activation is complex and may involve multiple intracellular signal transduction pathways, including the kinases PKA, MAPKs, JAKs, and PKCs, stimulated by cell-surface receptors [8, 9]. Transcription factors may also be directly activated by ligands such as glucocorticoids and vitamins A and D [5].

How are transcription factors regulated?

Transcription factors include a wide number of proteins, excluding RNA polymerase, that initiate and regulate the transcription of genes. … Other transcription factors bind to regulatory sequences, such as enhancer sequences, and can either stimulate or repress transcription of the related gene.

What stimulates gene transcription?

Activator protein binding is thought to cause DNA to loop out, bringing the activator protein into physical proximity with RNA polymerase and the other proteins in the complex that promote the initiation of transcription (Figure 4).