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Cloning and characterization of the chick Oct binding factor OBF-1
Shinji Takechi1, Masaru Adachi, Tatsuo Nakayama
1Department of Biochemistry, Miyazaki Medical College, Kihara, Kiyotake, Japan. stakechi@post1.miyazaki-med.ac.jp
Biochimica Et Biophysica Acta
|October 3, 2002
Summary
Researchers cloned chicken OBF-1 (chOBF-1), finding it binds chicken Oct-1 protein. This suggests conserved immunoglobulin gene transcription machinery, including Oct-1 and OBF-1, across vertebrate evolution.
Area of Science:
- Immunology
- Molecular Biology
- Evolutionary Biology
Background:
- Oct-binding factor 1 (OBF-1) is crucial for immunoglobulin gene expression.
- Understanding OBF-1 conservation across species provides insights into immune system evolution.
Purpose of the Study:
- To clone and characterize the chicken homolog of OBF-1 (chOBF-1).
- To investigate the interaction between chOBF-1 and chicken Oct-1.
- To determine the functional role of chOBF-1 in immunoglobulin gene transcription.
Main Methods:
- Cloning of the chOBF-1 gene.
- Amino acid sequence alignment to identify conserved domains.
- In vitro immunoprecipitation assays to assess protein binding.
- Reporter gene assays to evaluate promoter activation.
Main Results:
- The chOBF-1 protein, 256 amino acids long, shares 65% identity with human/mouse OBF-1.
- A conserved Oct-binding sequence (RPYQGVRVKEPVKELL(K/R)RKRG) was identified.
- chOBF-1 demonstrated binding to chicken Oct-1 protein.
- chOBF-1 functionally activated the chicken immunoglobulin light chain promoter.
Conclusions:
- The chicken OBF-1 homolog (chOBF-1) has been successfully cloned and characterized.
- chOBF-1 interacts with chicken Oct-1 and activates immunoglobulin gene transcription.
- These findings highlight the conserved nature of the Oct-1/OBF-1 transcription machinery in vertebrate evolution.