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- Title
Microchip electrophoresis assay for calmodulin binding proteins.
- Authors
Samarasinghe, Thushara N.; Zeng, Yong; Johnson, Carey K.
- Abstract
The calcium signaling protein calmodulin regulates numerous intracellular processes. We introduce a sensitive microchip assay to separate and detect calmodulin binding proteins. The assay utilizes an optimized microchip electrophoresis protein separation platform with laser‐induced fluorescence detection. Fluorescence‐labeled calmodulin modified with a photoreactive diazirine crosslinker allows selective detection of calmodulin binding proteins. We demonstrate successful in‐vitro crosslinking of calmodulin with two calmodulin binding proteins, calcineurin, and nitric oxide synthase. We compare the efficacy of commonly applied electrophoretic separation modes: microchip capillary zone electrophoresis, microchip micellar electrokinetic chromatography/gel electrophoresis, and nanoparticle colloidal arrays. Out of the methods tested, polydymethylsiloxane/glass chips with microchip zone electrophoresis gave the poorest separation, whereas sieving methods in which electro‐osmotic flow was suppressed gave the best separation of photoproducts of calmodulin conjugated with calmodulin binding proteins.
- Subjects
BINDING site assay; MICROCHIP electrophoresis; MICELLAR electrokinetic chromatography; CAPILLARY electrophoresis; CARRIER proteins; ELECTRO-osmosis; LASER-induced fluorescence; GEL electrophoresis
- Publication
Journal of Separation Science, 2021, Vol 44, Issue 4, p895
- ISSN
1615-9306
- Publication type
Article
- DOI
10.1002/jssc.202000884