Transcription factor activation
nounPronunciation: /trænsˈkrɪpʃən ˈfæktər ˌæktɪˈveɪʃən/
The functional modification of transcription factors through phosphorylation, ubiquitination, or conformational changes that enables binding to specific promoter regions and initiation of stress-responsive gene expression. This process is central to rapid cellular responses to abiotic stress.
Plain English
Proteins in cells become activated and turn on stress-response genes when plants sense environmental threats.
Etymology & History
Usage
"Transcription factor activation via the MAPK pathway triggers expression of drought-tolerance genes within minutes of water deficit perception."
Style guide notes: Specify which transcription factor family (AP1, bZIP, NAC) and which signaling pathway (MAPK, ABA) when discussing in scientific context.
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Frequently Asked Questions
How do transcription factors become activated during stress?
Stress signals trigger kinase cascades that phosphorylate transcription factors, causing conformational changes enabling DNA binding and gene activation.
What happens after transcription factor activation?
Activated factors translocate to the nucleus, bind specific promoter sequences, recruit RNA polymerase, initiating transcription of stress-response genes.
Why Test Candidates on This?
Critical in molecular biology, genetics, and advanced plant physiology; requires understanding of signaling and molecular mechanisms.
Required skill level: Senior