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dc.contributor.authorRamsay, Joshua
dc.date.accessioned2017-01-30T15:26:23Z
dc.date.available2017-01-30T15:26:23Z
dc.date.created2016-05-23T19:30:15Z
dc.date.issued2013
dc.identifier.citationRamsay, J. 2013. High-throughput ß-galactosidase and ß-glucuronidase Assays Using Fluorogenic Substrates. Bio-protocol. 3 (14): Article e827.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/46320
dc.identifier.doi10.21769/BioProtoc.827
dc.description.abstract

β-galactosidase and β-glucuronidase enzymes are commonly used as reporters for gene expression from gene promoter-lacZ or uidA fusions (respectively). The protocol described here is a high-throughput alternative to the commonly used Miller assay (Miller, 1972) that utilises a fluorogenic substrate (Fiksdal et al., 1994) and 96-well plate format. The fluorogenic substrates 4-Methylumbelliferyl β-D-galactoside (for β-galactosidase assays) (Ramsay et al., 2013) or 4-Methylumbelliferyl β-D-glucuronide (for β-glucuronidase assays) (Ramsay et al., 2011) are cleaved to produce the fluorescent product 4-methylumbelliferone. Cells are permeabilized by freeze-thawing and lysozyme, and the production of 4-methylumbelliferone is monitored continuously by a fluorescence microplate reader as a kinetic assay. The rate of increase in fluorescence is then calculated, from which relative gene-expression levels are extrapolated. Due to the high sensitivity fluorescence-based detection of 4-methylumbelliferone and the high density of time points collected, this assay may offer increased accuracy in the quantification of low-level gene expression. The assay requires small sample volumes and minimal preparation time. The permeabilisation conditions outlined in this protocol have been optimised for Gram-negative bacteria (specifically Escherichia coli and Serratia), but is likely suitable for other organisms with minimal optimisation.

dc.titleHigh-throughput ß-galactosidase and ß-glucuronidase Assays Using Fluorogenic Substrates
dc.typeJournal Article
dcterms.source.volume3
dcterms.source.number14
dcterms.source.startPagee827
dcterms.source.endPagee827
dcterms.source.titleBio-protocol
curtin.departmentSchool of Biomedical Sciences
curtin.accessStatusOpen access


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