Title

Kinetic Characterization of a PRMT1 C253S Mutant

Document Type

Presentation

Journal/Book Title/Conference

USU Student Showcase

Publication Date

4-2014

Faculty Mentor

Joan Hevel

Abstract

PRMT1 is one of nine currently known protein arginine methyltransferases, which transfer the methyl group from S-adenosylmethionine (SAM) to arginine residues of substrate proteins and peptides. Arginine methylation is involved in a vast range of cellular processes, and its dysfunction has been implicated to a number of pathological conditions, including cancer, diabetes and heart disease, thus PRMT1 regulation is a topic of interest. Using kinetic assays we have shown that PRMT1 activity is markedly lower in oxidized versus reduced samples. We have also calculated that the association constant is more than twenty times greater in reduced samples than in oxidized samples. The kinetic properties of PRMT1 are thought to be owed, in part, to the oligomeric state of the enzyme. Our studies indicate that the oligomeric state of PRMT1 is also influenced by the presence of reductant. PRMT1 samples treated with reductant were analyzed via size exclusion chromatography and shown to form smaller oligomers than untreated samples. However, a cysteine-less PRMT1 mutant does not exhibit redox dependent effects on activity or oligomerization. Based on these initial studies it seems likely that a cysteine residue is causing the effects we have observed. As part of an effort to determine which cysteine residues contribute to these effects we have created a C254S PRMT1 mutant, and we are currently working to characterize the kinetics of this enzyme. This work will add to a foundation for further research into the kinetic mechanism of PRMT1 and may contribute to the development of novel therapeutic pathways.

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