X-gal Substrate
X-gal Substrate - Related Videos
11:13
Identification of Kinase-substrate Pairs Using High Throughput Screening
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Cited by 1 •
2015
Protein phosphorylation is a central feature of how cells interpret and respond to information in their extracellular milieu. Here, we present a high throughput screening protocol using kinases purified from mammalian cells to rapidly identify kinases that phosphorylate a substrate(s) of interest.
08:59
Defining Substrate Specificities for Lipase and Phospholipase Candidates
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Cited by 10 •
2016
Many predicted (phospho)lipases are poorly characterized with regard to their substrate specificities and physiological functions. Here we provide a protocol to optimize enzyme activities, search for natural substrates, and propose physiological functions for these enzymes.
09:24
Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates
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Cited by 2 •
2012
A micropunching lithography approach is developed to generate micro- and submicron-patterns on top, sidewall and bottom surfaces of polymer substrates. It overcomes the obstacles of patterning conducting polymers and generating sidewall patterns. This method allows rapid fabrication of multiple features and is free of aggressive chemistry.
04:25
Substrate Oxidation Assay in Cultured Cells: An In Vitro Assay to Quantify Substrate Oxidation in Cells by Measuring Radioactive Signals from Trapped CO2
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2025
This video demonstrates a quantification technique for CO2 released during substrate oxidation using 14C-radiolabeled substrates. The released 14CO2 is trapped in an alkaline solution and quantified by a scintillation counter. The oxidation of different substrates varies between tissues and reflects the pathophysiological condition of the tissue.
11:53
Substrate Generation for Endonucleases of CRISPR/Cas Systems
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Cited by 4 •
2012
CRISPR/Cas systems mediate adaptive immunity in Bacteria and Archaea. Many Cas proteins are proposed to act as endoribonucleases acting on crRNA precursors of varying length. Here we illustrate three different approaches to generate pre-crRNA substrates for the biochemical analysis of Cas endonuclease activity.
FAQs
After β-galactosidase cleaves X-gal, the reaction generates an insoluble blue-colored product rather than a freely diffusing signal. That precipitation leaves the reporter output associated with the expressing cell, colony, or tissue region. Consequently, researchers can connect visible color to the location of β-galactosidase activity within the experimental sample.
lacZ functions as the genetic source of the β-galactosidase signal. When experimental regulation drives lacZ expression, the resulting enzyme can convert X-gal into visible color, linking a molecular event to an observable readout. This arrangement lets investigators assess reporter expression in relation to transformation, promoter activity, or spatial gene-expression patterns.
The insoluble nature of the blue product preserves spatial information. In a mixed sample, color remains associated with the cells or tissue regions where enzymatic activity occurred instead of simply dispersing throughout the surrounding material. That property makes X-gal useful for visualizing cellular patterns and for histochemical localization of gene expression.
Blue-white screening uses the color reaction as a visual comparison among bacterial colonies. Blue and white colony outcomes provide contrasting phenotypes that help researchers identify candidate recombinant clones after transformation. X-gal therefore converts reporter-associated β-galactosidase activity into a colony-level screening result, allowing clone assessment through visible color differences.
Researchers place X-gal in an experimental context containing β-galactosidase activity, such as transformed bacterial colonies or a gene-expression sample. They then examine whether a blue product appears and where it is located. The resulting pattern provides evidence of reporter activity in the tested material and can be interpreted at the level of cells, colonies, or tissues.
After transformation, X-gal can help monitor whether bacterial clones display the expected reporter-associated phenotype. In blue-white screening, colony color guides identification of clones for recombinant analysis, while the same reaction can be used to examine promoter activity. Its value lies in converting these biological events into a directly visible experimental result.
In developmental and molecular biology studies, the assay connects gene regulation with tissue or cellular pattern. Histochemical use allows investigators to examine where reporter activity occurs in an experimental sample, while promoter-focused applications reveal whether a linked regulatory element produces a detectable signal. Because observation does not require specialized instrumentation, the method supports straightforward visual assessment.