DOCSLIB.ORG

Applications of the GST- Affinity Tag in the Purification and Characterization of Proteins Wibke Beatrice Kachel University of Arkansas, Fayetteville

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Applications of the GST- Affinity Tag in the Purification and Characterization of Proteins Wibke Beatrice Kachel University of Arkansas, Fayetteville University of Arkansas, Fayetteville ScholarWorks@UARK Theses and Dissertations 8-2016 Applications of the GST- Affinity Tag in the Purification and Characterization of Proteins Wibke Beatrice Kachel University of Arkansas, Fayetteville Follow this and additional works at: http://scholarworks.uark.edu/etd Part of the Biochemistry Commons, and the Molecular Biology Commons Recommended Citation Kachel, Wibke Beatrice, "Applications of the GST- Affinity Tag in the Purification and Characterization of Proteins" (2016). Theses and Dissertations. 1625. http://scholarworks.uark.edu/etd/1625 This Dissertation is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Theses and Dissertations by an authorized administrator of ScholarWorks@UARK. For more information, please contact [email protected], [email protected]. Applications of the GST- Affinity Tag in the Purification and Characterization of Proteins A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Chemistry By Wibke Beatrice Kachel University of Regensburg Bachelor of Science in Biochemistry, 2010 University of Arkansas Bachelor of Science in Chemistry, 2011 August 2016 University of Arkansas This dissertation is approved for recommendation to the Graduate Council. ______________________________________________ Thallapuranam Krishnaswamy Suresh Kumar, Ph.D. Committee Chair ______________________________ Roger Koeppe II, Ph.D. Dan Davis, Ph.D. Committee Member Committee Member ______________________________ ______________________________ Bill Durham, Ph.D. David McNabb, Ph.D. Committee Member Committee Member Abstract With the latest innovations in biological sciences, large quantities of biologically active polypeptides as well as high throughput screening methods to quickly evaluate if these biomolecules potentially have therapeutic, diagnostic, or industrial purposes are required. The synthesis and purification of peptides and small proteins continue to be demanding as the production of high yields through chemical synthesis can involve large costs. On the other hand, there are only few examples of acquiring those biomolecules through cloning and expression in bacterial systems in form of recombinant fusion proteins. Glutathione S- Transferase (GST) is not only a very commonly used affinity tag to increase expression yields, but is also known to enhance the solubility of the protein of interest making it a valuable tool in the pursuit of purifying recombinant proteins. Moreover, multidimensional NMR spectroscopy is a widespread technique to reveal the 3D solution structure of proteins. Yet, obtaining structural information of peptides and small proteins can be difficult. In this context, we have developed a rapid purification of peptides and small proteins by fusing them to GST. The method developed is advantageous over the other reported methods due to its easy one-step purification yielding large amounts of fusion protein. Subsequently, the fusion protein is cleaved enzymatically under mild conditions, and the cleavage products are separated using an efficient heat treatment process. Our results show, the peptide and small protein conformations are not disturbed by the heat treatment. Therefore, our method can be a valuable alternative for the production of various clinically significant small proteins and peptides. Furthermore, we have optimized a method, which allows collecting structural information on protein/ peptide(s) of interest by employing the GST-tagged target protein during the acquisition of NMR data. Our results demonstrate that the affinity tag GST does not affect the quality of NMR data of its fused partner but that the loss of signals in the 1H-15N HSQC spectrum corresponding to the affinity tag is due to the decrease in the T2 relaxation rate upon dimerization as well as the flexibility within the fusion protein caused by the linker located between GST and the target protein. ©2016 by Beatrice Kachel All Rights Reserved Acknowledgements I would like to express my very great appreciation to my advisor, Dr. Kumar, for his patient guidance, and valuable and constructive suggestions during the planning and development of this research work that helped me grow as a researcher. I would also like to thank my committee for their assistance in keeping my progress on schedule and their advice during my committee meetings, and outside of lab. My special thanks are extended to the Kumar lab group. I would like to thank Srinivas Jayanthi for all the help, useful critics, enthusiastic encouragement, and friendship. Special thanks should also be given to Jacqueline Morris, Rory Henderson, and my other lab mates for all the help along the way. Assistance in the Pichia work provided by Dr. Pinto was greatly appreciated. I would like to acknowledge and thank my parents, especially my mom, for their support and love that gave me the strength to get through grad school. I want to thank my friends that I have met during grad school. I would like to express my deep gratitude to Erik Guzman, who became family to me, for looking out for me, being the very finest roommate, and inspiring me to be the best I can be. Many special thanks are extended to Kati Street for her friendship, spiritual support, and positive attitude that encouraged me throughout grad school. I cherish all the early mornings we got up to practice yoga. I would like to offer my special thanks to Matthias Knust for his friendship, brilliant analytical thinking that inspired lots of discussions, and help. Finally, I am particularly grateful for all the love, never-ending support and encouragement, and advice along the way given by George Sakhel. Table of Contents Page 1. Introduction..................................................................................................................................1 1.1. Protein purification......................................................................................................1 1.2. Affinity tags.................................................................................................................2 1.3. Glutathione S-transferase (GST)................................................................................18 1.4. GST as an affinity tag: SjGST26...............................................................................23 1.5. Versatility of the GST tag..........................................................................................27 1.6. Usage of GST-fused proteins.....................................................................................29 1.7. Removal of affinity tags.............................................................................................31 1.8. References..................................................................................................................37 2. Rapid and efficient purification of small proteins and peptides………....................................48 2.1. Abstract......................................................................................................................48 2.2. Introduction................................................................................................................49 2.3. Materials and Methods...............................................................................................50 2.4. Results………………................................................................................................56 2.5. Discussion..................................................................................................................66 2.6. References…………………………………………………………………………..68 3. Application(s) of the GST-fused proteins in NMR………………………................................72 3.1. Abstract......................................................................................................................72 3.2. Introduction................................................................................................................73 3.3. Materials and Methods...............................................................................................77 3.4. Results ………………...............................................................................................82 3.5. Discussion…………………………………………………………………………..93 3.6. Supplement…………………………………………………………………………97 3.7. References..................................................................................................................99 4. Conclusion...............................................................................................................................102 5. Appendix..................................................................................................................................104 5.1. Abstract....................................................................................................................104 5.2. Introduction..............................................................................................................105 5.3. Materials and Methods.............................................................................................112 5.4. Results and Discussion............................................................................................119 5.5. Conclusion………………………………………………………………………...134 5.6. References...............................................................................................................135 Abbreviations GST, Glutathione S-Transferase; His-tag, polyhistidine
Load more

Recommended publications
  • Protein Tagging and Detection with Engineered Self-Assembling Fragments of Green fluorescent Protein
    LETTERS Protein tagging and detection with engineered self-assembling fragments of green fluorescent protein Ste´phanie Cabantous, Thomas C Terwilliger & Geoffrey S Waldo Existing protein tagging and detection methods are powerful the same amount of refolded superfolder GFP 1–10. In addition to the but have drawbacks. Split protein tags can perturb protein folding reporter GFP mutations, GFP 1–10 OPT contains S30R, solubility1–4 or may not work in living cells5–7. Green Y145F, I171V and A206V substitutions from superfolder GFP and fluorescent protein (GFP) fusions can misfold8 or exhibit seven new mutations: N39I, T105K, E111V, I128T, K166T, I167V and altered processing9. Fluorogenic biarsenical FLaSH or S205T. This protein is B50% soluble when expressed in E. coli at ReASH10 substrates overcome many of these limitations but 37 1C (data not shown). Ultraviolet-visible spectra of 10 mg/ml require a polycysteine tag motif, a reducing environment and solutions of the nonfluorescent GFP 1–10 OPT lacked the 480 nm cell transfection or permeabilization10. An ideal protein tag absorption band of the red-shifted GFP19 (data not shown), suggest- http://www.nature.com/naturebiotechnology would be genetically encoded, would work both in vivo and ing that the addition of GFP 11 triggers a folding step required to in vitro, would provide a sensitive analytical signal and would generate the cyclized chromophore19. Purified GFP 1–10 OPT, super- not require external chemical reagents or substrates. One way folder GFP and folding reporter GFP were each studied by analytical to accomplish this might be with a split GFP11, but the GFP gel filtration loaded at 10 mg/ml.
    [Show full text]
  • Protein Expression and Purification Series
    Bio-Rad Explorer™ Protein Expression and Purifi cation Series Catalog Numbers 1665040EDU Centrifugation Purifi cation Process 1665045EDU Handpacked Purifi cation Process 1665050EDU Prepacked Purifi cation Process 1665070EDU Assessment Module explorer.bio-rad.com Please see each individual module for storage conditions. Duplication of any part of this document permitted for classroom use only. Please visit explorer.bio-rad.com to access our selection of language translations for Biotechnology Explorer Kit curricula. For technical service, call your local bio-rad offi ce, or in the U.S., call 1-800-4BIORAD (1-800-424-6723) Protein Expression and Purifi cation Series Dear Educator One of the great promises of the biotechnology industry is the ability to produce biopharmaceuticals to treat human disease. Genentech pioneered the development of recombinant DNA technology to produce products with a practical application. In the mid-1970s, insulin, used to treat diabetics, was extracted from the pancreas glands of swine and cattle that were slaughtered for food. It would take approximately 8,000 pounds of animal pancreas glands to produce one pound of insulin. Rather than extract the protein from animal sources, Genentech engineered bacterial cells to produce human insulin, resulting in the world’s fi rst commercial genetically engineered product. Producing novel proteins in bacteria or other cell types is not simple. Active proteins are often comprised of multiple chains of amino acids with complex folding and strand interactions. Commandeering a particular cell to reproduce the native form presents many challenges. Considerations of cell type, plasmid construction, and purifi cation strategy are all part of the process of developing a recombinant protein.
    [Show full text]
  • Preamble This Document Compares Affinity Tools for The
    1/8 Whitepaper “Affinity tools for the immunoprecipitation of GFP-fusion proteins” Preamble This document compares affinity tools for the immunoprecipitation of GFP-fusion proteins: • conventional anti-GFP antibodies, and • GFP-Trap®, a ready-to-use pulldown reagent that comprises an anti-GFP-Nanobody. What is the GFP-Trap? What are the differences between the ChromoTek GFP-Trap and conventional anti-GFP antibodies? How does the GFP-Trap have a superior performance for the immunoprecipitation of GFP-fusion proteins? Introduction of GFP as a protein-tag Green Fluorescent Protein (GFP) and variants are extensively used to study protein localization, interactions, and dynamics in cell biology. In many cases, data generated from microscopy studies requires complementary assays to obtain a more comprehensive set of information. Additional aspects including posttranslational modifications, DNA binding, enzymatic activity, and protein-protein interactions are investigated: Immunoprecipitation (IP), Co-IP, Co-IP for mass spectrometry (MS) analysis, and chromatin IP (ChIP) are used to complement microscopy measurements. Researchers now can apply GFP, GFP derivatives, and other fluorescent proteins using the constructs from microscopy analysis as epitope tags for reliable and sensitive biochemistry assays rather than re-cloning the genes coding for their protein of interest into vectors with traditional epitope tags. Furthermore, the performance of GFP-Trap makes GFP a first choice for biochemistry application. What is the GFP-Trap? The GFP-Trap Agarose is an anti-GFP-Nanobody covalently bound to agarose or magnetic agarose beads (Figure 1). It is used to immunoprecipitate GFP-fusion proteins from cell extracts of various organisms like mammals, plants, bacteria, fungi, insects, etc.
    [Show full text]
  • Anti-E-Tag Mab-Magnetic Beads
    M198-9 Page 1 For Research Use Only. P a Not for use in diagnostic procedures. g e Smart-IP Series 1 Anti-E-tag mAb-Magnetic beads CODE No. M198-9 CLONALITY Monoclonal CLONE 21D11 ISOTYPE Mouse IgG2a QUANTITY 20 tests (Slurry: 1 mL) SOURCE Purified IgG from hybridoma supernatant IMMUNOGEN KLH conjugated synthetic peptide, GAPVPYPDPLEPR (E-tag) REACTIVITY This antibody reacts with recombinant E-tagged protein. FORMURATION Covalently antibody conjugated 10 mg magnetic beads in 1 mL PBS/0.1% BSA/0.09% NaN3 *Azide may react with copper or lead in plumbing system to form explosive metal azides. Therefore, always flush plenty of water when disposing materials containing azide into drain. STORAGE This beads suspension is stable for one year from the date of purchase when stored at 4°C. APPLICATION-CONFIRMED Immunoprecipitation 50 L of beads slurry/sample For more information, please visit our web site http://ruo.mbl.co.jp/ MEDICAL & BIOLOGICAL LABORATORIES CO., LTD. URL http://ruo.mbl.co.jp/ e-mail [email protected], TEL 052-238-1904 M198-9 Page 2 P a g PM020-7 Anti-DDDDK-tag-HRP-DirecT (polyclonal) RELATED PRODUCTS e PM020-8 Anti-DDDDK-tag-Agarose (polyclonal) Smart-IP series D291-3 Anti-His-tag (OGHis) (200 L) 3190 Magnetic Rack 2 D291-3S Anti-His-tag (OGHis) (50 L) M198-9 Anti-E-tag-Magnetic beads (21D11) D291-6 Anti-His-tag-Biotin (OGHis) M185-9 Anti-DDDDK-tag-Magnetic beads (FLA-1) D291-7 Anti-His-tag-HRP-DirecT (OGHis) D291-9 Anti-His-tag-Magnetic beads (OGHis) D291-8 Anti-His-tag-Agarose (OGHis) D153-9 Anti-GFP-Magnetic beads (RQ2) D291-A48
    [Show full text]
  • Cloning Technologies for Protein Expression and Purification
    Cloning technologies for protein expression and purification James L Hartley Detailed knowledge of the biochemistry and structure of expedite the manipulations that are often required to individual proteins is fundamental to biomedical research. To obtain pure, active recombinant proteins. further our understanding, however, proteins need to be purified in sufficient quantities, usually from recombinant sources. Cloning for protein expression and Although the sequences of genomes are now produced in purification automated factories purified proteins are not, because their The required amount, purity, homogeneity, and activity behavior is much more variable. The construction of plasmids of the protein of interest usually determine the choice of and viruses to overexpress proteins for their purification is often expression context, vector and host. Usually the first tedious. Alternatives to traditional methods that are faster, easier consideration is what host cell to use. Expression in and more flexible are needed and are becoming available. Escherichia coli is fast, inexpensive and scaleable, and minimal post-translational modifications make proteins Addresses Protein Expression Laboratory, Research Technology Program, purified from E. coli relatively homogeneous and highly SAIC-Frederick, Inc., NCI-Frederick, Frederick, Maryland 21702, USA desirable for structural studies. However, in our experi- ence most eukaryotic proteins larger than 30 kDa are Corresponding author: Hartley, James L ([email protected]) unlikely to be properly folded when expressed in E. coli (JL Hartley et al., unpublished). Expression in mamma- Current Opinion in Biotechnology 2006, 17:359–366 lian cells is best for activity and native structure (includ- ing post-translational modifications), but yields are much This review comes from a themed issue on lower and costs are high.
    [Show full text]
  • Myc Tag Monoclonal Antibody
    Myc tag Monoclonal Antibody Product Code CSB-MA000041M0m Storage Upon receipt, store at -20°C or -80°C. Avoid repeated freeze. Immunogen EQKLISEEDL (Myc) synthetic peptide conjugate to KLH Raised In Mouse Species Reactivity N/A Tested Applications ELISA, WB, IF, IP; Recommended dilution: WB:1:500-1:5000, IF:1:100-1:300, IP:1:1000-1:1500 Relevance Myc tag is a polypeptide protein tag derived from the c-myc gene product that can be added to a protein. It can help to separate recombinant, overexpressed protein from wild type protein expressed by the host organism. Myc Tag also can be used to isolate protein complexes with multiple subunits. The Myc Tag Antibody is produced by the conjugation of a synthetic Myc tag peptide to KLH. Myc Tag Antibody can be used in various immunoassays, such as ELISA, Western blotting, immunoprecipitation, immunofluorescence, and more. Form Liquid Conjugate Non-conjugated Storage Buffer Preservative: 0.03% Proclin 300 Constituents: 50% Glycerol, 0.01M PBS, PH 7.4 Purification Method >95%, Protein G purified Isotype IgG1 Clonality Monoclonal Alias bHLHe39, c Myc, MRTL, MYC, Myc proto oncogene protein, MYC tag, Proto oncogene c Myc, Transcription factor p64 Product Type Monoclonal Antibody Target Names Myc tag Accession NO. 5F92F9 Image WB: Mouse anti Myc-tagged fusion protein Monoclonal antibody at 1.6µg/ml Lane 1: Recombinant Myc-tagged fusion protein at 50ng Lane 2: Recombinant Myc-tagged fusion protein at 25ng Lane 3: Recombinant Myc-tagged fusion protein at 12.25ng Lane 4: Recombinant Myc-tagged fusion protein at 6.25ng Lane 5: Recombinant Myc-tagged fusion protein at 3.125ng Lane 6: Recombinant Myc-tagged fusion protein at 1.5625ng 1 Secondary Goat polyclonal to Mouse IgG at 1/50000 dilution Predicted band size: 50 kd Observed band size: 50 kd Immunofluorescence staining of transfected HEK293 cells with CSB-MA000041M0m at 1:100, counter-stained with DAPI.
    [Show full text]
  • Engineering a Novel Multifunctional Green Fluorescent Protein Tag for a Wide Variety of Protein Research
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by PubMed Central Engineering a Novel Multifunctional Green Fluorescent Protein Tag for a Wide Variety of Protein Research Takuya Kobayashi1, Nobuhiro Morone2, Taku Kashiyama1, Hideto Oyamada3, Nagomi Kurebayashi1, Takashi Murayama1* 1 Department of Pharmacology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan, 2 Department of Ultrastructural Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan, 3 Department of Pharmacology, School of Medicine, Showa University, Shinagawa-ku, Tokyo, Japan Abstract Background: Genetically encoded tag is a powerful tool for protein research. Various kinds of tags have been developed: fluorescent proteins for live-cell imaging, affinity tags for protein isolation, and epitope tags for immunological detections. One of the major problems concerning the protein tagging is that many constructs with different tags have to be made for different applications, which is time- and resource-consuming. Methodology/Principal Findings: Here we report a novel multifunctional green fluorescent protein (mfGFP) tag which was engineered by inserting multiple peptide tags, i.e., octa-histidine (86His), streptavidin-binding peptide (SBP), and c-Myc tag, in tandem into a loop of GFP. When fused to various proteins, mfGFP monitored their localization in living cells. Streptavidin agarose column chromatography with the SBP tag successfully isolated the protein complexes in a native form with a high purity. Tandem affinity purification (TAP) with 86His and SBP tags in mfGFP further purified the protein complexes. mfGFP was clearly detected by c-Myc-specific antibody both in immunofluorescence and immuno-electron microscopy (EM).
    [Show full text]
  • Anti-Myc Tag Antibody
    D191042 Anti-Myc tag antibody Cat. No. D191042 Package 100 μl Storage Ascitic fluid with 0.05% sodium azide and 40% glycerol Product overview Description A n ti-Myc tag mouse monoclonal antibody Applications WB Immunogen Synthetic peptide conjugated with KLH Reactivity Fusion proteins containing the Myc Tag Host species Mouse Ig class IgG1 Purification Ascitics Target information Symbol Myc tag Full name Myc proto-oncogene protein Synonyms Swissprot P01106 Target Background A c-myc tag is a polypeptide protein tag derived from the c-myc gene product 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 c-myc 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 myc-tag allows one to follow the protein with an antibody against the Myc epitope. Examples are cellular localization studies by immunofluorescence or detection by Western blotting. It can be fused to the C-terminus and the N-terminus of a protein. It is advisable not to fuse the tag directly behind the signal peptide of a secretory protein, since it can interfere with translocation into the secretory pathway. Sangon Biotech Applications Western blotting Predicted band size:55 kDa Positive control:Fusion proteins containing the Myc Tag Recommended dilution: 5000-10000 Gel: 8%SDS-PAGE Lysate: 0.04/0.08/0.32 μg Lane 1-3: Fusion proteins containing the Myc Tag Primary antibody: D191042(Myc tag Antibody) at dilution 1/6000 Secondary antibody: Goat anti mouse IgG at 1/5000 dilution Exposure time: 3 seconds Sangon Biotech.
    [Show full text]
  • Internal Epitope Tagging of Proteins Using Transposon Tn7
    HIGHLIGHTED ARTICLE GENETICS | INVESTIGATION Avoiding the Ends: Internal Epitope Tagging of Proteins Using Transposon Tn7 Rebecca E. Zordan,*,1 Brian J. Beliveau,* Jonathan A. Trow,* Nancy L. Craig,† and Brendan P. Cormack*,2 *Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2185, and †Department of Molecular Biology and Genetics, The Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2185 ABSTRACT Peptide tags fused to proteins are used in a variety of applications, including as affinity tags for purification, epitope tags for immunodetection, or fluorescent protein tags for visualization. However, the peptide tags can disrupt the target protein function. When function is disrupted by fusing a peptide to either the N or C terminus of the protein of interest, identifying alternative ways to create functional tagged fusion proteins can be difficult. Here, we describe a method to introduce protein tags internal to the coding sequence of a target protein. The method employs in vitro Tn7-transposon mutagenesis of plasmids for random introduction of the tag, followed by subsequent Gateway cloning steps to isolate alleles with mutations in the coding sequence of the target gene. The Tn7-epitope cassette is designed such that essentially all of the transposon is removed through restriction enzyme digestion, leaving only the protein tag at diverse sites internal to the ORF. We describe the use of this system to generate a panel of internally epitope-tagged versions of the Saccha- romyces cerevisiae GPI-linked membrane protein Dcw1 and the Candida glabrata transcriptional regulator Sir3. This internal protein tagging system is, in principle, adaptable to tag proteins in any organism for which Gateway-adapted expression vectors exist.
    [Show full text]
  • 4 Strategies for Boosting Transient Protein Expression Application Note Application Note
    www.genscript.com 4 Strategies for Boosting Transient Protein Expression Application Note Application Note 4 Strategies for Boosting Transient Protein Expression Introduction Recombinant proteins are essential tools in basic and applied biomedical research. Using the power of recombinant DNA (rDNA) technology, production of recombinant proteins in desired quantities and purities for a variety of applications has become more widespread. Moreover, this technology enables scientists to engineer proteins for specific study objectives. Since every protein has unique structural and functional characteristics, tailored protocols must be developed to optimize the expression and purification of each individual protein. In this application note, we will describe key factors affecting transient protein expression yield in a mammalian system and discuss essential strategies to modify them in order to obtain functional proteins in desired quantity and purity. Three aspects are key in recombinant protein expression: quantity, purity, and functionality. A variety of factors such as poor sequence design and choice of vector, contamination, suboptimal reagents and experimental conditions can lead to protein insolubility, aggregation, or misfolding, which ultimately affect recombinant protein expression. Strategy 1: Designing an Expression Vector The strategy to avoid many of the above-mentioned problems is to design the best coding sequence and choose the most appropriate expression vector for your specific downstream application. Using advanced codon optimization algorithms, such as OptimumGene™, and expression vector selection guides, such as GenScript's GenSmart™ Design Tool, before you start your expression can save you effort, time, and money. Adopting the following strategies can also help you avoid or address issues with suboptimal protein expression regardless of your specific sequence or expression system.
    [Show full text]
  • Flag Tag Monoclonal Antibody # A02010
    Flag Tag Monoclonal Antibody # A02010 Product Information Product Name: Anti-Flag Tag Mouse Monoclonal Antibody (1B10) Applications: WB, IF, IP Isotype: Mouse IgG1 Catalog Number: A02010 Lot Number: Refer to vial Formulation: Liquid Size: 20ul/100ul/500ul Storage: Store at -20°C. Avoid repeated Note: 0.02% Sodium Azide freeze / thaw cycles. Background: The DYKDDDDK peptide (Flag-tag) is a polypeptide protein tag that can be added to a protein using recombinant DNA technology. It can be used for affinity chromatography, and then used to separate recombinant, over expressed protein from wild-type protein expressed by the host organism. It can also be used in the isolation of protein complexes with multiple subunits. Application Notes: Optimal working dilutions should be determined experimentally by the investigator. Suggested starting dilutions are as follows: WB (1:1,000-1:10,000), IF (1:500-1:2,000) and IP (1:200-1:800). Storage Buffer: PBS, pH 7.4, containing 0.02% sodium azide as preservative and 50% glycerol as stabilizer. Storage Instructions: Stable for one year at -20°C from date of shipment. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Aliquot to avoid repeated freezing and thawing. Fig. 1. IP (1:200) - WB (1:5,000) analysis of Flag fusion protein expression in 293 cells. Untransfected 293 cell lysate (line A), transfected 293 cell lysate with Flag-tag protein (line B), IP transfected 293 with normal Mouse IgG and Protein G agarose (line C), IP transfected 293 with Anti Flag tag mAb and Protein G agarose (line D), and IP transfected 293 with only Protein G agarose (line E) Fig.
    [Show full text]
  • Myc Tag Monoclonal Antibody # A02060
    Myc Tag Monoclonal Antibody # A02060 Product Information Product Name: Anti-Myc Tag Mouse Monoclonal Antibody (2D5) Applications: WB, IF, IP Isotype: Mouse IgG1 Catalog Number: A02060 Lot Number: Refer to vial Formulation: Liquid Size: 20ul /100ul/500ul Storage: Store at -20°C. Avoid repeated Note: 0.02% Sodium Azide freeze / thaw cycles. Background: Myc tag is a polypeptide protein tag derived from the c-myc gene product that can be added to a protein using recombinant DNA technology. It can be used for affinity chromatography, and 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. Application Notes: Optimal working dilutions should be determined experimentally by the investigator. Suggested starting dilutions are as follows: WB (1:1,000-1:10,000), IF (1:500-1:2,000) and IP (1:200-1:500). Storage Buffer: PBS, pH 7.4, containing 0.02% sodium azide as preservative and 50% glycerol as stabilizer. Storage Instructions: Stable for one year at -20°C from date of shipment. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Aliquot to avoid repeated freezing and thawing. Fig. 1. WB analysis of 1ug Myc fusion protein with Anti-Myc mouse monoclonal antibody (2D5) in 1:5,000 dilution (line A) and 1:10,000 dilution (line B). Fig. 2. IP (1:200) - WB (1:5,000) analysis of Myc fusion protein expression in 293 cells. Untransfected 293 cell lysate (line A), transfected 293 cell lysate with Myc-tag protein (line B); IP transfected 293 cell lysate with normal Mouse IgG (line C) or with Anti Myc tag mAb (line D) , and without both normal Mouse IgG and Myc tag mAb (line E).
    [Show full text]