Biotin labeling is a commonly used biochemical technique for studying biomolecules such as proteins and nucleic acids. According to different labeling methods, biotin labeling can be divided into site-specific labeling and random labeling.
Site-specific labeling refers to the specific conjugation of biotin to a designated position on the target molecule. This labeling method is typically achieved through genetic engineering techniques or specific enzymatic reactions.
Method
The AviTag technology uses a biotin ligase (such as BirA) to covalently link biotin to a specific lysine residue. This labeling method is highly specific and does not affect protein activity.
Advantages
- High specificity: Biotin is only linked to the predetermined site without affecting protein activity or function.
- Directional consistency: Labeled proteins exhibit uniform orientation when binding to streptavidin, facilitating subsequent research.
- High labeling efficiency: The labeling rate is usually over 95%.
Random labeling refers to the reaction of biotin with multiple potential sites on the target molecule, with non-fixed labeling positions.
Method
It is typically achieved through chemical conjugation, using active derivatives of biotin (such as N-hydroxysuccinimide ester-activated biotin) to react with groups like amino, carboxyl, or sulfhydryl on proteins.
Advantages
- High labeling degree: Due to random labeling positions, a high labeling density can be achieved on the molecule.
- Simple operation: The labeling process is relatively easy, requiring no complex genetic engineering manipulation.
| Characteristic |
Site-specific Labeling |
Random Labeling |
| Labeling position |
Specific position |
Random position |
| Labeling method |
Genetic engineering or enzymatic reaction |
Chemical conjugation |
| Specificity |
High |
Low |
| Impact on protein activity |
Low |
High |
| Labeling efficiency |
High |
Variable |
| Background signal |
Low |
High |
| Applications |
Protein purification, immobilization, detection, protein interaction studies |
Immunohistochemistry, ELISA, Western blot, etc. |
By selecting the appropriate labeling method, the effect of biotin labeling can be optimized according to experimental needs.
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Catalog Number
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Product Name
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Remarks
|
|
UA070015
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Biotin Labeling for Avitag Protein Kit
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AviTag site-specific labeling |
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UA080466
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Biotin Rapid Coupling Kit
|
Primary amino (-NH2) labeling
|
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UA080467
|
Biotin (cleavable) Rapid Coupling Kit
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Primary amino (-NH2) labeling, cleavable
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UA080468
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Biotin Labeling Efficiency Detection Kit (HABA Method)
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Labeling efficiency detection
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Click on the product catalog numbers below to access detailed information on our official website.
This article is reviewed and published by the technical expert team of UA
Disclaimer: This article partially utilizes artificial intelligence assistance in its creation. If any content involves copyright or intellectual property issues, please let us know and we promise to verify and remove it as soon as possible.
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