Transcription Factors | tlamjs

Intracellular proteins that bind to specific regions of DNA to control transcription are known as transcription factors. Examples include:
PIF and DELLA proteins
Proteins coded by the regulatory genes of the lac operon
cAMP and the second messenger model
Products of proto-oncogenes and tumour suppressor genes

Gibberellin and DELLA proteins

DELLA proteins inhibit transcription by binding to a molecule known as PIF. This prevents PIF from transcribing DNA into mRNA. However, DELLA is broken down when the plant hormone gibberellin is present. The PIF is now free to join to the promoter…

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