flag peptide FLAG - FLAG peptidesequence FLAG peptide The FLAG Peptide: A Versatile Tool in Protein Research and Purification

FLAGtag The FLAG peptide, also known as the FLAG-tag or DYKDDDDK-tag, is a short, synthetic peptide sequence that has become an indispensable tool in molecular biology and protein research. Its primary function is to serve as an epitope tag, facilitating the detection, purification, and manipulation of recombinant proteins. This article delves into the nature of the FLAG peptide, its applications, and the scientific principles behind its effectiveness, drawing upon extensive research and industry practices.

Understanding the FLAG Peptide

At its core, the FLAG peptide is an eight-amino acid sequence with the specific order: Asp-Tyr-Lys-Asp-Asp-Asp-Asp-Lys (DYKDDDDK).https://www.beyotime.com/product/P9801-1mg.htm This sequence is not derived from any naturally occurring protein, making it an artificial tag. The FLAG-tag is often referred to as a peptide protein tag due to its small size and its ability to be fused to a target protein using recombinant DNA technology.DYKDDDDK Peptide The sequence is designed to be hydrophilic and highly charged, which contributes to its easy detection and purification作者：JW Beugelink·2024·被引用次数：18—Here we present anatomic resolution (1.17 Å) structure of the FLAG peptidein complex with the Fab of anti-FLAG M2, revealing key binding determinants..

One of the key advantages of the FLAG peptide is its defined chemical structureHow to immunoprecipitate Flag®-tagged proteins | Proteintech Group. For instance, the FLAG peptide sequence is precisely DYKDDDDK. This precise sequence allows for highly specific binding by antibodies. Furthermore, variations such as the 3x FLAG peptide exist, which consist of three tandem copies of the DYKDDDDK sequence. This triplicated tag can enhance binding affinity and improve the efficiency of purification or detection. The 3x FLAG peptide has a molecular weight of approximately 2864 DaFlag-tag and 3x Flag-tag.

Applications and Advantages

The FLAG peptide finds extensive application in various biological assays and experimental procedures. Its primary use is in the purification of recombinant proteins. By genetically fusing the FLAG tag to a protein of interest, researchers can then use antibodies specific to the FLAG tag (such as Anti-FLAG M1 or M2 antibodies) immobilized on a solid support (like affinity chromatography columns) to capture the tagged proteinDYKDDDDK peptidecan be used to competitively elute DYKDDDDK-tagged fusion proteins from immobilized anti- DYKDDDDK tag magnetic beads.. This process is known as immunoaffinity purification.Pierce™ 3x DYKDDDDK Peptide.Pierce 3x DYKDDDDK Peptideis a lyophilized peptide with the sequence ...

The FLAG peptide also offers a convenient way to detect and quantify proteins. This can be achieved through methods like ELISA, Western blotting, or flow cytometry, where the presence of the FLAG tag on a protein can be visualized using anti-FLAG antibodiesBiotin-FLAG peptide. The ability to detect and purify is crucial for studying protein function and localization.The FLAG tag Peptide (DYKDDDDK)is used as an epitope tag in recombinant protein expressionto facilitate detection and purification.The FLAG tag Peptide is ...

A significant feature of the FLAG peptide is the presence of an enterokinase cleavage site within its sequence. This allows for the removal of the FLAG tag from the purified protein if necessary, thus ensuring that the tag does not interfere with the protein's native structure or function. The cleavage typically occurs under non-denaturing conditions, preserving the integrity of the target proteinFlag-tag isa commonly used epitope or peptide tagthat is not derived from a natural protein. The Flag-tag is an artificial tag and, based on the peptide ....

Technical Specifications and Considerations

When working with the FLAG peptide, several technical aspects are importantFLAG epitope tag or DYKDDDDK isa short hydrophilic, highly charged peptide. It is widely used for structural and functional studies of proteins.. The purity of the FLAG peptide is often specified, with many commercial products offering ≥85% (HPLC) purity, typically in a lyophilized powder form.Flag-tag and 3x Flag-tag For example, a common offering is the FLAG peptide (5 mg).

Regarding its use in purification, the efficiency of FLAG peptide elution is a critical factor.Biotin-FLAG peptide While the FLAG peptide itself can be used for competitive elution, meaning it can displace the tagged protein from the antibody-bound column, the concentration and effectiveness of this elution can vary. For instance, 3x FLAG peptide elution may not always remove all bound protein, and regeneration protocols for the affinity column are often recommendedFLAG ® Peptide. The optimal FLAG peptide elution concentration is a parameter that may need to be empirically determined for specific experimental setupsDYKDDDDK peptidecan be used to competitively elute DYKDDDDK-tagged fusion proteins from immobilized anti- DYKDDDDK tag magnetic beads..

The FLAG tag is considered a versatile fusion tag, and its utility has been demonstrated across numerous studies. For example, the atomic resolution (1.17 Å) structure of the FLAG peptide in complex with the Fab of anti-FLAG M2 has been elucidated, providing key insights into the binding determinants. This structural information is invaluable for understanding the specificity and efficacy of the antibody-FLAG peptide interaction.

Variations and Related Products

Beyond the standard FLAG peptide, several variations are available to suit different research needs. These include:

* 3x FLAG peptide: As mentioned, this offers enhanced bindingFlag peptide | C41H60N10O20 | CID 9854670 - PubChem - NIH.

* Biotin labeled FLAG peptide: This allows for detection or capture using streptavidin or avidin systems, further expanding its utility in various assay formats.

* Poly DYKDDDDK Tag Peptide: This refers to longer peptides containing multiple repeats of the DYKDDDDK sequence.FLAG tag Peptide... This is a laboratory product for research use only. Not for personal consumption. It will not be effective and is dangerous for personal use.

The FLAG tag is a popular protein tag that has been used in affinity chromatography and protein research for over two decades. Its reliability and versatility make it a go-to choice for researchers investigating the function and localization of proteins, especially when antibodies against the native protein are not readily available. The FLAG peptide is a valuable tool for recombinant protein expression and downstream applications, contributing significantly to advancements in biological sciences.