|Datasheet||Specific References||Reviews||Related Products||Protocols|
|Vector Type||Mammalian Expression Vector|
|Expression Method||Constiutive, Stable / Transient|
|Selection In Mammalian Cells||Hygromycin|
FLAG-tag, or FLAG octapeptide, is a polypeptide protein tag that can be added to a protein using recombinant DNA technology. It can be used for affinity chromatography, then used to separate recombinant, overexpressed protein from wild-type protein expressed by the host organism. It can also be used in the isolation of protein complexes with multiple subunits.
A FLAG-tag can be used in many different assays that require recognition by an antibody. If there is no antibody against the studied protein, adding a FLAG-tag to this protein allows one to follow the protein with an antibody against the FLAG sequence. Examples are cellular localization studies by immunofluorescence or detection by SDS PAGE protein electrophoresis.
The peptide sequence of the FLAG-tag from the N-terminus to the C-terminus is: DYKDDDDK (1012 Da). It can be used in conjunction with other affinity tags, for example a polyhistidine tag (His-tag), HA-tag or Myc-tag. It can be fused to the C-terminus or the N-terminus of a protein. Some commercially available antibodies (e.g., M1/4E11) recognize the epitope only when it is present at the N-terminus. However, other available antibodies (e.g., M2) are position-insensitive.
|Human HSF1 ORF mammalian expression plasmid, C-GFPSpark tag||HG12245-ACG|
|Human HSF1 ORF mammalian expression plasmid, C-OFPSpark / RFP tag||HG12245-ACR|
|Human HSF1 ORF mammalian expression plasmid, N-GFPSpark tag||HG12245-ANG|
|Human HSF1 ORF mammalian expression plasmid, N-OFPSpark / RFP tag||HG12245-ANR|
|Human HSF1 ORF mammalian expression plasmid, C-Flag tag||HG12245-CF|
|Human HSF1 ORF mammalian expression plasmid, C-His tag||HG12245-CH|
|Human HSF1 ORF mammalian expression plasmid, C-Myc tag||HG12245-CM|
|Human HSF1 ORF mammalian expression plasmid, C-HA tag||HG12245-CY|
|Human HSF1 Gene cDNA clone plasmid||HG12245-G|
|Human HSF1 natural ORF mammalian expression plasmid||HG12245-G-N|
|Human HSF1 ORF mammalian expression plasmid, N-Flag tag||HG12245-NF|
|Human HSF1 ORF mammalian expression plasmid, N-His tag||HG12245-NH|
|Human HSF1 ORF mammalian expression plasmid, N-Myc tag||HG12245-NM|
|Human HSF1 ORF mammalian expression plasmid, N-HA tag||HG12245-NY|
|Human HSF1 natural ORF mammalian expression plasmid||HG12245-UT|
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Heat shock factor protein 1, also known as heat shock transcription factor 1, HSF1 and HSTF1, is a cytoplasm and nucleus protein which belongs to the HSF family. HSF1 is the major transcription factor of HSPs (heat shock proteins) in response to various stresses. Wild type HSF1 (heat shock transcriptional factor 1) is normally inactive. HSF1 / HSTF1 is a DNA-binding protein that specifically binds heat shock promoter elements (HSE) and activates transcription. In higher eukaryotes, HSF is unable to bind to the HSE unless the cells are heat shocked. HSF1 / HSTF1 protects cells and organisms against various types of stress, either by triggering a complex response that promotes cell survival or by triggering cell death when stress-induced alterations cannot be rescued. HSF1 / HSTF1 is the key protein in regulating stress response. It can be activated under heat, oxidative or another stress conditions. Dominant-positive and dominant-negative HSF1 are two types of HSF1 mutants. Both of them gain the DNA binding activity in the absence of stress. In addition, dominant-positive HSF1 acquires transcriptional activity, which dominant-negative HSF1 does not acquire. HSF1 / HSTF1 was also reported to contribute to cell resistance against genotoxic stress, such as that caused by doxorubicin, an anticancer drug in common clinical use.