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...cells, live cells, my marker stains of interest). Let’s double-click inside our gate and proceed to the...present that vary in cell type, size, and marker proteins. But even if you are analyzing a homogenous cell... SSC values depend on the structural complexity inside the cell or on its surface. Bear in mind, the voltage... the magnitude of FSC, SSC, and all fluorescent stains. The cytometer's software will allow you to adjust...potential that can be applied to the photomultiplier inside the cytometer to increase the electric current ...where multiple cells were clumped together. (B) Instead of FSC, one is free to use SSC for a single cell...separation pattern of positive vs. negative signal remains the same (Figure 5).   A.                                                                                                        ...

...effectively biotinylate AviTag expressing proteins in bacteria, yeast, insect and mammalian cells. Check out Kay...about in vivo biotinylation of bacterial fusion proteins Biotin is an essential vitamin for life Although... immunoprecipitation experiments. Biotinylated proteins or complexes can be easily purified using columns...help with the specific elution of biotinylated proteins. For help determining which biotinylation reagent...Biotinylation Reagent Selection Tool. AviTag and BirA Proteins can also be biotinylated by exploiting the specificity...Kay et al., 2009 for methods on biotinylating proteins with BirA. You can find plasmids that contain ...Scientists have commonly used this method to attach proteins or polypeptides to a solid substrate (Holden and...

...are systems like split inteins or SpyTag, which are useful for connecting proteins in the test tube or in...image, purify, or solve the structure of proteins. Split inteins are particularly useful for a kind of cellular...be similarly useful across the diverse kinds of proteins that one finds in cells. High yield of reaction...SNAP-tag and HaloTag modules, which can connect proteins to any kind of small molecule probes with different... Tag Description Humberg et al. (2025) Split inteins Cysteine-less, fast split intein; N-terminal CLm...CLm and C-terminal Aes gp41-1 Split inteins A small, fast split intein SpyTag003/SpyCatcher003 SpyTag...Tagging Kit SpyTag/SpyCatcher CRISPR-assisted insertion tagging Kit; integration of large DNA fragments...

...surface proteins with a membrane-impermeable biotin substrate (Figure 1). Biotinylated proteins were isolated... from Collins & Lau et al. (2024) under CC BY-NC-ND license.  In addition to chromoproteins, the ...single-cell RNA-seq data. In addition to unique proteins on each cell type, the cell-surface shared proteome...neurons (CS SPAN) featured extracellular matrix proteins, cell adhesion molecules, transporters, ion channels...been derived from just a few parent fluorescent proteins, PinkyCaMP is the first based on mScarlet. Compared...populations in vivo in both mouse and zebrafish brains. Figure 3: PinkyCaMP and FRCaMPi in use...accessibility outside of well-equipped laboratories remains limited. Members of the Stanley Qi Lab set out ...

...refers to 3 proteins (H-Ras, K-Ras, and N-Ras) encoded by a family of proto-oncogenes. Ras proteins are special...” shape and lack of “druggable” domains. In other words, Ras proteins naturally lack areas that are accessible...Resources National Cancer Institute: Cancer Statistics Page National Cancer Institute: Ras Pathway v2.0 Page...products. Proto-oncogenes consist of a group of genes/proteins that, when expressed, normally encourage cell ... right places. Checks and balances: protecting against cancerous cells Luckily, there are several safety...not ideal environments for many cell types. From proteins to pathways - Ras as a model When mutations do...different cancers and identifying the roles of key proteins involved, with the goal of being able to discriminately...

...most famous of these proteins is Cas9 nuclease, but there are many other Cas proteins as well, both natural...you. We’ll cover the common terminology for the proteins, DNA, and RNA used in CRISPR.   Figure...tracrRNA (in some systems including Cas9), Cas proteins, and a CRISPR array. The CRISPR array is composed...spacer. In bacteria, these crRNAs are bound by Cas proteins (Cas9 shown here). The repeat sequence base pairs...Cas: Different CRISPR systems involve different proteins, but many of them are called Cas, short for “CRISPR-associated...natural and engineered. What these proteins all have in common is the ability to use an RNA guide to target...Target strand: The strand of foreign DNA that Cas proteins recognize using an RNA guide. Non-target strand...

... 13(4):602-606. Brian, D. 1996, Einstein: A Life. Chapter 17, Einstein Discovers America. New York./  ...their trainees’ very way of thinking too. Albert Einstein might have put it best when he stated, “the value...metabolic pathways (precisely the type of exercise Einstein might have resented!). In 1997, Joseph Provost...structure, function, and interaction with other proteins.   It is important to note that research ...Kimball et al., 2020). Benefits and Challenges CUREs inspire students to take ownership of their work and become... him a more effective motivator (“be like Tony Robbins!” he encourages faculty mentors.)  Collaboration..., Provost partnered with colleagues at other institutions to form a support network called the MDH CUREs...

...is fused to the DNA backbone that contains a target sequence against the fluorescent reporter in an inverted...single hairpin dsRNA is produced that contains sequence against your gene(s) of interest and the reporter... and Biotechnology from Worcester Polytechnic Institute. What is RNAi? The loss-of-function (LOF) experiment...downregulation, or “silencing,” of any gene that contains sequence complementary to the dsRNA (Wilson and... is facilitated by DNA constructs that enable insertion of ~400 bp complementary to your gene target as...whereas shRNAs are exogenously derived. Importantly, instead of the assortment of siRNAs generated from a long...outside of limited, single cell protoplast analysis. Instead, microscopic plants must be visually identified...

... enzymes - Cas13a contains two HEPN domains, whereas Cas9 uses HNH and RuvC domains to cleave target DNA... HEPN domains in other proteins. As with Cas9, mutating key residues in the Cas13a molecule results in...SpCas9 is not the only game in town, and other Cas proteins like SaCas9 and Cpf1 can circumvent the limitations..., and the various applications of Cas13a. The origins of Cas13a: An RNA cleaving CRISPR nuclease Cas13a...form of “bait” to identify new CRISPR-associated proteins within the bacterial genome. From this analysis... DNA. The HEPN domains within Cas13a are essential for RNA cleavage, consistent with known roles for HEPN...Comparison on Common CRISPR Enzymes Name  Enzymatic Domains Guide RNA Target PAM (PFS) Cleavage Mechanism ...

...correct insert (gRNA) in pX330/pX335 with BbsI/AgeI double digestion. As a successful insertion will destroy...vector (like PX330). For large changes (>100 bp insertions or deletions), we typically use plasmid donor...homology arms on each side flanking your desired insertion or mutation. Each arm is around 800 bp. For transfection...CRISPR/Cas9 system to create specific mutations or insertions by Homologous Recombination (HR), what is the...purified long oligos. For large changes (>100 bp insertions or deletions), the Zhang lab typically uses a...homology arms on each side flanking your desired insertion or mutation. Each arm is around 800 bp. For transfection... What is the maximum amount of DNA that can be inserted into the genome using CRISPR/Cas for Homologous...

...more fluorescent proteins are made. As the bacterial replicate, fluorescent proteins will be diluted out...excited to see the many creative uses of fluorescent proteins. We’re happy to announce the three winners of ...by fluorescence-activated cell sorting into four bins based on their eGFP:mCherry ratios. Genomic DNA ...response to warfarin. “These novel methods will be instrumental in interpreting human variation at large scales...making personalized medicine a reality,” Chiasson explains. Elizabeth Unger: Developing a serotonin sensor... sensor. However, there are no known bacterial proteins that bind serotonin. Unger redesigned the binding...patient and rapidly test the variants in vitro against different drugs and dosages.  Michal Bernach: Developing...

...candidates for further development. They inserted an octet of MS2 hairpins into the gRNA tetraloop and went through...-head against CRISPRainbow. Both tools were targeted to the FBN3 intronic repeat which contains 22 copies...the genomic loci of interest. Pairs of identical hairpins within one gRNA will result in a blue, green, ...red readout. But gRNAs containing two different hairpins will produce a secondary color (yellow, cyan, ...hairpin combination. A gRNA containing all three hairpins produces a white color. While CRISPRainbow allows...CRISPRainbow labeling. Two MS2, PP7, or boxB sequences inserted into the sgRNA generates blue, green, or red colors...induce its fluorescence. They found that aptamer insertion in the gRNA tetraloop (a four base hairpin loop...

...users can submit new fluorescent proteins, add data to existing proteins when missing, or edit inaccuracies... specific protein (for instance: EGFP).  Users can “favorite” certain proteins, or create custom protein...recognized by the 2008 Nobel Prize, fluorescent proteins (FPs) have become one of the most indispensable... one might require when making such a decision remains spread across literature in publications that introduce...community resource for information about fluorescent proteins.  It was designed with the goal of encouraging...Protein Properties provides a master list of all proteins in the database, and the Interactive Fluorescent...moderate your own version of fpvis.org with the proteins of your choosing!), and they can be downloaded...

...recombinant proteins a cinch. This is because it doesn’t secrete its own endogenous proteins, making the...affordable, and it grows fast to boot. The yeast strains S. cerevisiae and S. pombe have dominated the research... between two of the most frequently used yeast strains: S. pombe (fission) and S. cerevisiae (budding)...established in yeast, including a widely used Parkinson’s experimental model. In fact, approximately 25%...differences between K. phaffii and other yeast strains.     S. cerevisiae S. pombe K. phaffii...and bears more similarity to the ancient yeast strains and metazoan cells.   Applications for K. phaffii...was co-opted for the expression of recombinant proteins by the pharmaceutical and biotech industries as...

...possible to generate antibodies against many types of molecules including proteins, lipids, and carbohydrates... post we’ll focus on antibodies that recognize proteins. Figure 1: Steps in the generation of hybridomas...hybridomas come from animals that were immunized against the target protein. Animals are first injected ...special medium called HAT. This medium selects against unfused myeloma cells and antibody-producing B ... will exhibit off-target binding to unintended proteins. This is because monoclonal antibodies recognize...amino acid sequence will be shared across other proteins. Conversely, polyclonal antibodies - which are...recognize epitopes that are also present in other proteins. Because of the specificity of monoclonal antibodies...

... This means recombinant proteins can aggregate or precipitate out as insoluble granules. We overcame this...decidedly uncomfortable 45°C). Their more adventurous cousins are the extremophiles - the legends who not only...of processes. The food processing industry, for instance, employs psychrophilic enzymes for milk processing...enzymes for the host The expression of recombinant proteins for industrial or research purposes requires stable... standard conditions. However, one of the many proteins which are not compatible with regular mesophilic...temperatures suitable for the expression of psychrophilic proteins. The primary problem we wanted to overcome was...folding and expression of recombinant psychrophilic proteins. As the figure below shows, E. coli expressing...

...podcast segment The human proteome contains a breadth of modular domains that facilitate protein-protein ...for RNAi. The Vellai lab’s new plasmid, T444T, contains T7 terminators adjacent to the T7 promoters to...TurboID and miniTurbo Article contributed by Eric Perkins  Listen to the TurboID and miniTurbo podcast segment... study of the distribution and interactions of proteins within these structures. Enzyme-catalyzed proximity...distribution and interaction networks of specific proteins in living cells. Until recently, the enzymes most...APEX2 and BioID. APEX2 is fast, tagging proximal proteins within minutes, but requires H2O2, which can be... tailored for the detection of other norovirus strains and even other viruses by modifying the sequence...

...majority of Type VI-D loci contain accessory proteins with WYL domains (named for the three conserved amino acids...domain-containing proteins may be broader regulators of Cas13d activity. This property makes WYL proteins an intriguing... near a putative effector nuclease. The Cas13d proteins they identified have little sequence similarity...Cas13a-c orthologs, but they do include HEPN nuclease domains characteristic of the Cas13 superfamily. Yan et...advantages, including Cas13d-specific regulatory proteins and high targeting efficiency, both of which are...intriguing counterpart to anti-CRISPR proteins that negatively modulate the activity of Cas enzymes, some...specific editor in mammalian cells Not all Cas13d proteins are functional in mammalian cells, but Konermann...

... HIV so that infected cells will produce viral proteins and die, either through cytotoxicity or the immune...transcription, but with two additional activation domains (MS2 and p65) to enhance transcriptional activation...expression. In cell lines that can produce HIV-1 toxic proteins, CRISPR/Cas9 SAM caused apoptosis, indicating ...cell and 2. prevent reinfection of those cells. Kaminski et al. designed gRNAs to target the HIV-1 5’ and...Importantly, no off-target effects were detected. Kaminski et al. observed no negative effects on cell viability...up to 7 mismatches to the gRNA target sequence. Kaminski et al. next tested their procedure in HIV-1 infected...expanded, and infected with HIV-1. For two HIV-1 strains, Cas9/gRNA lentiviral expression significantly ...

...available here for free!) contains strategies, hints, anecdotes, and insights. After I wrote the first ... at the National Institutes of Health, was an Associate Professor at Albert Einstein College of Medicine...Hughes Medical Institute. His interests include the quality control of secretory proteins in the Endoplasmic... and mentoring to several people that found my insights helpful. All went on to get faculty positions ...specific questions and experiments. Nobody EVER complains that a seminar was too easy to understand. Make... Distinguishing correctly folded and misfolded proteins is essential for human health. Failure to do so...terms. "Implications for human disease" is vague. Instead, consider "A mechanistic understanding of this ...