Snap-tag Labeling
Snap-tag Labeling - Related Videos
07:38
Fluorescent Labeling of COS-7 Expressing SNAP-tag Fusion Proteins for Live Cell Imaging
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Cited by 8 •
2010
SNAP-tag and CLIP-tag protein labeling systems enable the specific, covalent attachment of molecules, including fluorescent dyes, to a protein of interest in live cells. Once cloned and expressed, the tagged protein can be used with a variety of substrates for numerous downstream applications without having to clone again.
08:04
Evaluating the Accuracy of Snap Judgments
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2023
Source: Diego Reinero & Jay Van Bavel—New York University Social psychologists have long been interested in the way people form impressions of others. Much of this work has focused on the errors people make in judging others, such as the exaggerated influence of central traits (such as "warm" and "cold"), the insufficient weight given to the context in which others' behavior takes place, and the tendency for people to make judgments that conform to their initial expectations about another.
09:06
Enhanced Sample Multiplexing of Tissues Using Combined Precursor Isotopic Labeling and Isobaric Tagging (cPILOT)
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Cited by 10 •
2017
Combined precursor isotopic labeling and isobaric tagging (cPILOT) is a quantitative proteomics strategy that enhances sample multiplexing capabilities of isobaric tags. This protocol describes the application of cPILOT to tissues from an Alzheimer's disease mouse model and wild-type controls.
04:36
A Snap Chip Technology for a Cross-Reactivity-Free Multiplexed Sandwich Immunoassay
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2025
The video showcases the implementation of snap chip technology for cross-reactivity-free multiplexed sandwich immunoassays. The simple action of snapping two microarray slides, each containing different reagents, ensures reagent transfer without cross-contamination and helps to detect multiple proteins using sandwich immunoassay.
10:44
Snap Chip for Cross-reactivity-free and Spotter-free Multiplexed Sandwich Immunoassays
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Cited by 3 •
2017
We demonstrate a snap chip technology for performing cross-reactivity-free multiplexed sandwich immunoassays by simply snapping two slides. A snap apparatus is used for reliably transferring reagents from microarray-to-microarray. The snap chip can be used for any biochemical reactions requiring colocalization of different reagents without cross-contamination.
FAQs
The key reaction is enzyme-mediated self-labeling. The engineered O6-alkylguanine-DNA alkyltransferase domain recognizes a benzylguanine-linked substrate, then transfers the attached probe onto its own protein structure. This creates an irreversible covalent attachment rather than a transient association, so the signal or affinity handle remains linked during subsequent observation or biochemical handling.
Irreversibility preserves the identity of the labeled protein after the reaction has occurred. A stable covalent connection can support measurements of localization, trafficking, turnover, or interactions without relying on continuous probe binding. Consequently, researchers can follow protein behavior over time or retain the label during purification and quantitative biochemical assays.
Probe selection determines what information the experiment can produce. Fluorescent probes support visualization, affinity probes support biochemical purification, and other chemical probes can provide alternative molecular readouts. The same tagging strategy can therefore be adapted to imaging, biochemical purification, or quantitative analysis, provided the benzylguanine-linked substrate matches the SNAP-tag reaction.
Specificity comes from pairing the engineered tag with its compatible benzylguanine-linked substrate. The tag is genetically encoded on the protein of interest, while the probe is supplied in a linked substrate form that the enzyme recognizes. This molecular match helps distinguish the intended protein from unrelated cellular or purified-system components during labeling.
A basic workflow begins by producing the protein with the genetically encoded SNAP-tag, then exposing it to a benzylguanine-linked probe in either living cells or a purified biochemical system. After the covalent reaction, the chosen readout can be collected, such as fluorescence-based localization, purification-related analysis, or a quantitative assay.
The choice depends on the question being asked. Living-cell experiments can examine where a protein goes, how it traffics, or how it turns over. Purified systems instead connect labeling with biochemical purification and analysis of molecular behavior, allowing the same covalent strategy to serve both cellular investigations and studies of isolated proteins.
SNAP-tag labeling is useful when a study needs to track more than a protein’s presence. Fluorescent labeling can reveal localization and trafficking, while stable attachment supports turnover measurements and interaction studies. Affinity or other chemical probes broaden the approach beyond microscopy, linking the selected molecular readout to the biological or biochemical question.
In biochemistry, the method bridges molecular structure, dynamic behavior, and function. A tagged protein can be examined through fluorescence microscopy, biochemical purification, or quantitative assays, with the probe chosen for the desired measurement. This makes the technique complementary rather than limited to one instrument or one type of experimental readout.