Zebrafish Sp1-like protein is structurally and functionally comparable to human Sp1

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• The Sp1 transcription factor is crucial for regulating TATA-less genes.
• Sp1 belongs to the Cys₂-His₂ zinc finger protein family.
• Understanding zebrafish Sp1 provides insights into vertebrate gene regulation.

Purpose of the Study:

• To clone and characterize a zebrafish Sp1 homolog.
• To assess the functional and structural similarity to human Sp1.
• To establish a tool for studying gene regulation in zebrafish.

Main Methods:

• Cloning of zebrafish Sp1 cDNA into a pET43.1a vector.
• Expression of Nus-His-tag fusion protein in Escherichia coli Rosetta (DE3) cells.
• Protein purification using Ni-Sepharose chromatography.
• DNA affinity precipitation and dual-luciferase reporter assays.

Main Results:

• Successful expression and purification of recombinant zebrafish Sp1 protein (5-8 mg/L).
• Primary sequence and predicted tertiary structure resemble human Sp1.
• Functional assays confirmed its role as a transcription factor.
• Zebrafish Sp1 exhibits structural and functional comparability to human Sp1.

Conclusions:

• The recombinant zebrafish Sp1 protein is a functional transcription factor.
• Zebrafish Sp1 is a valuable model for studying Sp1-mediated gene regulation.
• This study provides a foundation for comparative genomics and developmental biology research.