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The ins and outs of protein splicing elements
1National Institute for Medical Research, Mill Hill, London, UK.
Molecular Microbiology
|May 1, 1994
Summary
Protein splicing, a process where internal sequences called inteins are removed, can act as mobile genetic elements. Evidence suggests inteins may be under selection, challenging their
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Protein splicing removes internal sequences (inteins) from precursor proteins, ligating flanking regions.
- Inteins function similarly to introns in rRNA processing.
- Inteins are novel genetic elements potentially promoting their own spread via gene conversion.
Purpose of the Study:
- Investigate the nature and function of inteins in protein splicing.
- Explore the potential of inteins as mobile genetic elements.
- Examine the evolutionary implications of inteins, particularly regarding selection.
Main Methods:
- Analysis of protein splicing mechanisms.
- Genetic studies on intein-mediated gene conversion.
- Evolutionary analysis of intein distribution and function.
Main Results:
- Protein splicing mechanism is encoded within the intein sequence itself.
- Inteins can mediate gene conversion, facilitating their dissemination.
- Emerging evidence suggests selection for protein splicing, contradicting the selfish genetic element hypothesis.
Conclusions:
- Inteins are self-contained catalytic entities mediating protein splicing.
- Inteins exhibit characteristics of mobile genetic elements, promoting their propagation.
- The role of inteins may extend beyond selfish elements, with evidence for host-driven selection.