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Nucleotide sequence and expression of the rat polyubiquitin mRNA
1Department of Biochemistry, Jikei University School of Medicine, Tokyo, Japan.
Biochimica Et Biophysica Acta
|June 21, 1994
Summary
Researchers identified two rat polyubiquitin clones, UbB and UbC, from brain cDNA. These genes are expressed across various rat tissues, indicating their fundamental roles in cellular processes.
Area of Science:
- Molecular Biology
- Genetics
- Neuroscience
Background:
- Ubiquitin is a crucial protein involved in cellular regulation.
- Polyubiquitin genes encode multiple ubiquitin units and play vital roles.
Purpose of the Study:
- To isolate and characterize rat polyubiquitin clones.
- To investigate the expression patterns of these clones in different rat tissues.
Main Methods:
- cDNA library screening using rat brain tissue.
- Analysis of isolated clone sequences (22B1 and 19A2).
- RNA blotting to determine transcript sizes and expression.
Main Results:
- Isolation of two distinct polyubiquitin clones, 22B1 (UbB homolog) and 19A2 (UbC homolog).
- Clone 22B1 contained four tandem ubiquitin repeats.
- Clone 19A2 contained ten ubiquitin repeats plus a distinct peptide.
- UbB (1.2 kb) and UbC (2.8 kb, 3.2 kb) transcripts were found in multiple rat tissues.
Conclusions:
- The identified clones represent rat UbB and UbC gene families.
- Ubiquitin gene expression is widespread in rat tissues, suggesting broad functional importance.