Structure and Activity of a Novel Archaeal β-CASP Protein
Author Information
Author(s): Ana P.G. Silva, Maria Chechik, Robert T. Byrne, David G. Waterman, C. Leong Ng, Eleanor J. Dodson, Eugene V. Koonin, Alfred A. Antson
Primary Institution: York Structural Biology Laboratory, Department of Chemistry, University of York
Hypothesis
We hypothesize that this nuclease degrades mRNAs of proteins targeted for degradation and so regulates archaeal RNA turnover, possibly in concert with the exosome.
Conclusion
MTH1203 is a zinc-dependent nuclease that preferentially binds U-rich RNA sequences and functions as a dimer to enhance its nuclease activity.
Supporting Evidence
- MTH1203 is a dimer and this dimerization enhances the nuclease activity.
- RNA-binding experiments indicate that MTH1203 preferentially binds U-rich sequences.
- MTH1203 is shown to be a zinc-dependent nuclease.
Takeaway
MTH1203 is a protein that helps break down RNA in certain microorganisms, and it works better when two of them stick together.
Methodology
The study involved crystallizing the MTH1203 protein, analyzing its structure, and conducting RNA-binding and nuclease activity assays.
Limitations
The study does not conclusively determine whether MTH1203 acts as an endonuclease or exonuclease.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website