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Identification of the DNA sequence that interacts with the gut-enriched Krüppel-like factor
1Department of Medicine and Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Nucleic Acids Research
|March 14, 1998
Summary
The gut-enriched Krüppel-like factor (GKLF) is a sequence-specific transcription factor. Researchers identified its minimal DNA binding sequence, revealing its role in regulating gene expression.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- The gut-enriched Krüppel-like factor (GKLF) is a eukaryotic transcription factor with homology to other Krüppel proteins.
- The specific DNA sequence recognized by GKLF was previously undetermined.
- GKLF's role in gene regulation requires understanding its DNA binding specificity.
Purpose of the Study:
- To determine the precise DNA sequence bound by the gut-enriched Krüppel-like factor (GKLF).
- To characterize the binding properties of GKLF.
- To establish GKLF as a functional transcription factor.
Main Methods:
- Used purified recombinant GKLF in a target detection assay with a random oligonucleotide library.
- Employed repeated rounds of selection and base-specific mutagenesis to identify the binding site.
- Performed co-transfection experiments to assess the functional activity of the identified GKLF binding sequence.
Main Results:
- Identified the minimal essential DNA binding site for GKLF as 5'-G/AG/AGGC/TGC/T-3'.
- This sequence is homologous to regulatory elements in the beta-globin and CYP1A1 genes.
- GKLF binding site mediated reporter gene transactivation in co-transfection assays, confirming GKLF's function.
Conclusions:
- GKLF is a sequence-specific transcription factor.
- The identified DNA binding sequence is crucial for GKLF's regulatory activity.
- GKLF likely plays a significant role in the regulation of endogenous gene expression.