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Published on: April 22, 2021
Intermolecular domain swapping induces intein-mediated protein alternative splicing
A Sesilja Aranko1, Jesper S Oeemig, Tommi Kajander
1Research Program in Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki, Helsinki, Finland.
Nature Chemical Biology
|August 27, 2013
Summary
Inteins enable protein alternative splicing, creating new protein sequences and functions without genetic changes. This process offers a novel way to enhance protein diversity and control protein functions post-translationally.
Area of Science:
- Molecular Biology
- Biochemistry
- Structural Biology
Background:
- Protein sequence diversity is primarily achieved through DNA mutation and recombination, and RNA splicing.
- Inteins, the protein counterparts of introns, catalyze protein splicing but their biological roles remain unclear.
- Current understanding suggests inteins do not confer obvious benefits or essential functions to host organisms.
Purpose of the Study:
- To investigate the potential for protein alternative splicing as a mechanism for generating protein diversity.
- To elucidate the molecular mechanisms underlying intein-mediated protein recombination.
- To explore the application of protein alternative splicing as a post-translational regulatory mechanism for protein function.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy to analyze protein structures and interactions.
- X-ray crystallography to determine high-resolution structures of intein-mediated protein complexes.
- Biochemical assays to demonstrate protein splicing and functional changes.
Main Results:
- Demonstrated protein alternative splicing through intermolecular domain swapping mediated by inteins.
- Elucidated the structural basis of this novel protein recombination mechanism using NMR and crystal structures.
- Showcased intein-mediated protein alternative splicing as a strategy to increase protein functional diversity without altering the genetic code.
- Exploited this mechanism as a post-translational switch to modulate protein functions, including protein interference.
Conclusions:
- Intein-mediated protein alternative splicing represents a novel mechanism for generating protein diversity and function.
- This process allows for the creation of new protein sequences and functions independent of genetic modifications.
- Protein alternative splicing offers a versatile platform for post-translational control of protein functions, with potential applications in biotechnology and medicine.
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