An Inexpensive Staining Alternative for Gelatin Zymography Gels.

Methods Protoc

Center for Medical Research, Medical Faculty, Johannes Kepler University, 4020 Linz, Austria.

Published: July 2019

Zymography is a widely used electrophoretic method to determine proteolytic activities in samples from various sources. The method is based on copolymerizing a suitable protein substrate within a sodium dodecyl sulfate-polyacrylamide gel. Following electrophoretic separation of the protease containing samples and a suitable incubation period, degradation of the substrate can be visualized through staining with Coomassie blue. Sites of proteolysis become visible as white bands on a dark blue background. However, this staining protocol requires considerable amounts of ethanol and acetic acid to remove unbound dye molecules. In this report, we describe a new staining protocol using Ponceau S which offers substantial advantages in terms of assay usability and cost reduction, especially when performing large quantities of zymograms or in resource-limited settings. Fast and reproducible staining of zymograms with our protocol is demonstrated, and reliable quantitation of proteolytic activity in comparison to the standard Coomassie staining procedure is shown.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6789862PMC
http://dx.doi.org/10.3390/mps2030061DOI Listing

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