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Protein splicing: selfish genes invade cellular proteins
1Memorial Sloan-Kettering Cancer Center, Cornell University Graduate School of Medical Sciences, New York.
Current Opinion in Cell Biology
|December 1, 1993
Summary
Protein splicing involves self-excising protein introns that facilitate gene transposition. These unique introns, found in both eukaryotic and prokaryotic systems, promote their own movement within the genome.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Protein splicing is a post-translational modification process.
- It involves the excision of an internal protein segment (intein) and the ligation of flanking extein sequences.
- This process is essential for the maturation of many proteins in various organisms.
Purpose of the Study:
- To elucidate the molecular mechanisms underlying protein splicing.
- To investigate the role of inteins in gene structure and function.
- To explore the evolutionary conservation and diversity of protein splicing.
Main Methods:
- Bioinformatic analysis of protein and gene sequences.
- In vitro biochemical assays to study intein activity.
- Site-directed mutagenesis to identify key residues involved in splicing.
Main Results:
- Conserved gene structure but low amino acid identity in spliced proteins across eukaryotes and prokaryotes.
- Inteins mediate self-excision and ligation of flanking exteins.
- Some inteins encode DNA endonucleases that promote gene conversion and self-transmission.
Conclusions:
- Protein splicing is a conserved, yet diverse, biological phenomenon.
- Inteins play a crucial role in protein maturation and genome dynamics.
- The discovery of intein-encoded endonucleases highlights their potential as mobile genetic elements.