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Showing: 401 - 420 of 458 results
  1. Viral Vectors 101: Chemogenetics

    Type
    Blog Post
    Published
    July 11, 2023, 1:15 p.m.
    ...Combining a PSAM with the IPD of a cation channel, such as the serotonin 3 receptor, will promote depolarization...chemogenetics for research and potential clinical applications. Science 6436: eaav5282. https://science.sciencemag.org...
  2. Addgene-Seeding Labs plasmid grant round 3: microbial drug resistance and biofilms, antidiabetic plant components, visualizing brain injury - and a glowing robot fish

    Type
    Blog Post
    Published
    Nov. 27, 2018, 2 p.m.
    ...fields and geographical locations. In addition to providing reagents and educational resources for scientists...formation. The quest for plant compounds to treat complications of diabetes Gloria Otito Izu, PhD Candidate...nephropathy, one of the major pathophysiological complications of diabetes mellitus. Recombinant human proteins... employing synthetic biology resources and microfabrication technologies to generate a self renewable ... in the river, take water samples at specific locations, measure fluorescent signals from the sensor, ...
  3. Plasmids 101: Protein tags

    Type
    Blog Post
    Published
    Dec. 11, 2014, 4:26 p.m.
    ...tag than protein), 2-3 tags is increasingly common. Tandem affinity purification (TAP) once referred specifically...or DYKDDDK 1 Affinity and Purification Good for antibody-based purification; has inherent enterokinase...site GST Large Protein 26 Purification and Stability Good for purification with glutathione; protects...used for purification as elution requires low pH poly His HHHHHH  0.8 Affinity and Purification Very small...GKPIPNPLLGLDST   1.4 Affinity and Purification Good for antibody-based purification Combo and cleavage tags...multitude of uses including (but not limited to) purification, detection, solubilization, localization, or...fusion proteins to aid in the expression and purification of recombinant proteins. Tags for stability...
  4. Isolating Genomic Regions of Interest with the CRISPR System

    Type
    Blog Post
    Published
    May 30, 2019, 12:44 p.m.
    ...immunoprecipitation (enChIP)." Scientific reports 3 (2013): 3171. PubMed PMID: 24201379. PubMed Central...affinity purification with an anti-Cas9 antibody. These different tag systems and affinity purification schemes...genomic alterations. These studies utilize a catalytically inactive form of Cas9 known as dCas9 (Jinek ...interest targeted by a gRNA. CRISPR-mediated purification of a specific genomic region In 2013, the Hodaka...Subsequent mass spectroscopy studies allowed for the identification of proteins associated with the IRF-1 locus...steps (Fujita et al., 2013). CRISPR-mediated purification of a specific genomic region alleviates these...the initial report describing CRISPR-mediated purification of a specific genomic region, numerous adaptations...
  5. Tips from the Repository Trenches: Using Barcodes to Track Samples

    Type
    Blog Post
    Published
    Oct. 6, 2015, 2:30 p.m.
    ...corresponding Excel sheet.3. Be specific  - When assigning a physical location to your samples, include.... Tracking samples - it's all about location, location, location There are many different types of samples...but we also have a dedicated and detail-oriented lab team that works carefully to catch mistakes. Each sample...sample a unique location in a specific freezer will help ensure that samples are easy to locate in freezers...also help us keep track of the tubes’ physical location in the lab. These barcodes additionally allow ...Addgene. Each sample at Addgene has four layers of location which can all be extrapolated from the 2D barcode...Plate Freezer Rack Freezer Tubes are assigned a location within a plate that can hold up to 96 tubes (see...
  6. Bacterial Toxin-antitoxin Systems as Molecular Biology Tools

    Type
    Blog Post
    Published
    Nov. 1, 2018, 12:35 p.m.
    ...addiction module" regulated by guanosine [corrected] 3', 5'-bispyrophosphate: a model for programmed bacterial...activity of CcdB. Applications of ccdB in plasmid cloning Perhaps the most widely used application of CcdB is...selection markers. Restriction modification systems Because restriction modification systems consist of two enzymes...used as biological tools for a wide range of applications in molecular biology or in vivo studies. Let...types of plasmid addiction systems and their applications. The discovery of toxin-antitoxin systems Toxin-antitoxin...CcdA (antitoxin) where CcdB inferes with DNA replication by binding the GyrA subunit of DNA gyrase and...construct. Other toxin-antitoxin systems and their applications MazE/MazF Aside from CcdB/CcdA, there are many...
  7. Magnetic Control of Proteins: More than a Dream

    Type
    Blog Post
    Published
    Sept. 24, 2024, 1:15 p.m.
    ...Magnetogenetic Ion Channels. Biophysical Journal, 116(3), 454–468. https://doi.org/10.1016/j.bpj.2019.01.003... tools for familiar applications. But how does one invent a tool for applications that don’t even exist...phenomenon, improve the tool, and develop new applications for magnetoresponsive proteins. Motivated by...organisms) are opaque, which makes most biomedical applications of these tools difficult or impossible. But ...tool with magnets would enable new research and applications that don’t yet exist, but it wasn’t clear that...changes in response to a ~25 mT magnet. Gray regions indicate times when the magnetic field is on. Image reproduced..., in response to a ~10 mT magnet. Gray regions indicate times when the magnetic field is on. Image reproduced...
  8. Droplet Digital PCR for AAV Quantitation

    Type
    Blog Post
    Published
    Jan. 16, 2020, 2:18 p.m.
    ...sample to a mastermix. At Addgene, we typically load 3 dilutions onto our ddPCR plate. As the titer is unknown...take to achieve a clean NTC: Have a dedicated bench with a dedicated set of pipettes for ddPCR set-up. .... Each droplet contains the ingredients for amplification of the target DNA. This partitioning reduces...detection of the product. As an added benefit, replicates are built into the technology. One well (containing...droplet contains the material required for a mini amplification reaction to take place.  When the PCR is complete...number of cycles. After additional rounds of amplification, your fluorescence amplitude will increase, ... use ddPCR for AAV titration, there are many applications for the technology.  Droplet digital PCR is ...
  9. Viral Production at Addgene

    Type
    Blog Post
    Published
    Oct. 24, 2023, 1:15 p.m.
    ...darker than full vector particles.     Figure 3: Electron micrograph of AAV vector preparation shows...Addgene has a growing catalogue of viral preps available to request. In this post, we’ll walk you through...minimized by using an endotoxin-free plasmid purification protocol. To minimize the immunogenic properties...posted on the material page for the corresponding catalog item (see maps section for images).     ...Lentivirus Production Lentiviral preparations ("-LV” catalog items) are produced in 293T cells using the 2nd.... Concentrated lentiviral preparations (“-LVC” catalog items) are generated from lentiviral preparations...typically prepared using endotoxin-free plasmid purification kits.     Figure 4: Schematic of the...
  10. CRISPR 101: RNA Editing with Cas13

    Type
    Blog Post
    Published
    July 31, 2020, 12:30 p.m.
    ...Orthogonal Type VI-A CRISPR-Cas Enzymes." Mol Cell. 66(3) (2017):373-83. PubMed PMID: 28475872. Find plasmids...RESCUE in therapeutic applications, the authors tested various dRanCas13b truncations that would allow packaging...longer stretches of duplexed RNA. Using an ADAR2DD catalytic mutant, they showed that editing is mediated by...into adeno-associated viral vectors, they tested truncated ADARDDs to see if they could shrink the construct... to deaminate cytidine and used dRanCas13b (catalytically inactive Cas13) to target the cytosine deaminase...construct for viral delivery. They found C-terminal truncations allowed the same or improved editing ability ...
  11. Antibodies 101: Immunoprecipitation

    Type
    Blog Post
    Published
    Dec. 7, 2021, 2:15 p.m.
    ...specifically to the blue triangle protein but not the other. 3) The beads are collected by centrifugation or a magnet...a protein’s stability or post-translational modifications, or study how a target protein interacts with...Protein A and Protein G are not suitable for all applications, such as protein isolation from serum. In this...capture antibody interaction and/or the downstream application. Typically, if the target protein will be detected...and an isotype control antibody. Alternative applications Oftentimes, an IP-appropriate antibody simply...identify DNA binding proteins involved in histone modification. Similarly, RNA IP (RIP) can be used to isolate...resources References:  Björck L, Kronvall G (1984) Purification and some properties of streptococcal protein...
  12. Don’t FRET: Bimolecular Fluorescence Complementation Makes Visualizing Protein-Protein Interactions Easy

    Type
    Blog Post
    Published
    Aug. 27, 2020, 1:15 p.m.
    ...–798. https://doi.org/10.1016/s1097-2765(02)00496-3 Kerppola TK (2006) Design and implementation of bimolecular...PIPs, resulting in a fluorescent readout.   Applications for bimolecular fluorescence complementation...resulting from the assayed PPI. This high-throughput application is much more straightforward to carry out because...protein construction, cellular expression, and quantification (Kerppola, 2006, 2013). These are described... supraphysiological expression levels. BiFC quantification This is where BiFC outshines FRET — BiFC experiments...
  13. Better Dyeing Through Chemistry & Small Molecule Fluorophores

    Type
    Blog Post
    Published
    Sept. 8, 2016, 2:30 p.m.
    ...PMID: 25599551. PubMed Central PMCID: PMC4344395. 3. Lavis, Luke D., and Ronald T. Raines. "Bright ideas...Subsequent advances in fluorescent proteins have replicated many of the properties once exclusive to small-molecules...phosphopantetheinyltransferase) – These enzymes catalyze the covalent attachment of a fluorophore ligand...labels for fixed-cell imaging, not for live-cell applications. Thus, these fluorophores are often bulky and...the Addgene Blog Learn About Other Protein Tags Catch Up on Your Fluorescent Protein Background Which ...
  14. Plasmids 101: The Promoter Region – Let's Go!

    Type
    Blog Post
    Published
    April 3, 2014, 8:05 p.m.
    ...Strong yeast expression promoter from glyceraldehyde 3-phosphage dehydrogenase Constitutive  Very strong,...resistance gene and the origin of replication are necessary to replicate plasmids and make sure the cells...length version is strong with high expression. Truncated promoters are constitutive with lower expression...metabolic operon Inducible by arabinose and repressed catabolite repression in the presence of glucose or by competitive...
  15. Antibiotic Resistance: An Old Solution but a New Problem

    Type
    Blog Post
    Published
    Nov. 10, 2016, 3:30 p.m.
    ...Government (2016). 2. CDC Information Pages on Antibiotics 3. WHO Antimicrobial Resistance Fact Sheet  Additional...Microbes (bacteria included) are very skilled at the delicate art of survival. Existing virtually ubiquitously...of intentions. The take-home? Always take your medication as prescribed. How do we know which bacteria ... is passionate about health equity, science communication, and public health.     References 1. O'Neill...
  16. Save Time with Transient Plant Leaf Transformations

    Type
    Blog Post
    Published
    July 25, 2019, 12:03 p.m.
    ...bell or desiccator. Successful infiltration can often be seen by sinking of the tissue (see Figure 3). This...vincristine, are regulated in the medicinal plant, the Catharanthus roseus (Figure 1). The ultimate goal of our ...expression method for analyzing gene function in Catharanthus roseus seedlings." Frontiers in plant science...
  17. Bioinformatics at Addgene

    Type
    Blog Post
    Published
    July 14, 2022, 1:15 p.m.
    ... the subsequent bbmerge process.     Fig. 3: How we get bbdone with our bbduk process.    ... from depositing laboratories and associated publications, but our quality control (QC) standards have...such as 96-well microplates, and thanks to our dedicated product and development teams, frequent updates...can be easily shared with others without any complicated setup. We created, tested, and debugged each ...
  18. To Codon Optimize or Not: That is the Question

    Type
    Blog Post
    Published
    Nov. 12, 2020, 2:15 p.m.
    ... sequence complementary to the mRNA sequence. The 3’ end of  the tRNA binds the amino acid that corresponds...folding and stability, change post-translational modification sites and even affect protein function (Mauro... AP, Bilen B, Zavolan M (2013) Analysis of CDS-located miRNA target sites suggests that they can effectively...synonymous codon usage bias, and its potential applications. Nucl Acids Res 15:1281–1295 . https://doi.org...
  19. Light Sheet Fluorescence Microscopy

    Type
    Blog Post
    Published
    July 16, 2015, 2:30 p.m.
    ...Frank Bradke laboratories later developed the 3DISCO (3-dimensional imaging of solvent cleared organs) method...of LSFM microscopes (3,4). After this initial application, Stelzer’s group described the single-plane or...brightness with increasing depth caused by light scattering and absorption.  Finally, the photomultipliers...
Showing: 401 - 420 of 458 results