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Mapping functional regions of the segment-specific transcription factor Krox-20
1Laboratoire de Génétique Moléculaire, CNRS D 1302, Ecole Normale Supérieure, Paris, France.
Nucleic Acids Research
|May 25, 1992
Summary
Krox-20 (a transcription factor) uses its zinc fingers for DNA binding. Its N-terminal region contains two acidic domains crucial for transcriptional activation in vertebrate central nervous system development.
Area of Science:
- Molecular Biology
- Neuroscience
- Genetics
Background:
- Krox-20 is a transcription factor vital for vertebrate central nervous system development.
- Understanding Krox-20's molecular properties is key to elucidating its physiological functions.
Purpose of the Study:
- To perform a structure-function analysis of Krox-20.
- To identify regions responsible for DNA-binding and transcriptional activation.
Main Methods:
- Structure-function analysis of Krox-20 protein domains.
- Deletion mutagenesis to assess DNA-binding and transactivation capabilities.
Main Results:
- The zinc finger region is essential and sufficient for high-affinity, specific DNA-binding.
- Deletion of the N-terminal region abolished transactivation, while deletion of the C-terminal tail had no effect.
- Two cooperating acidic activation domains were identified in the N-terminal region.
Conclusions:
- Krox-20's DNA-binding is mediated solely by its zinc fingers.
- The N-terminal region, containing acidic activation domains, is critical for Krox-20's transcriptional activity.
- Functional organization, including conserved acidic activation domains, is suggested across the Krox-20 subfamily.