Protein Expression and Analysis
Homology Modeling in the World of Proteins
Homology modeling is a powerful tool that enables you to predict protein structures. But how do you do it? Read on to find out.
Read MoreLaemmli Buffer: What Is It for Anyway?
Laemmli buffer is used almost every day by life since researchers. But what do all those components actually do? Find out in this handy article
Read MoreIsoelectric Focusing: A Simple Way to Enhance Your Protein Separation
Isoelectric focusing is a way of separating proteins and peptides based on their isoelectric point. Read all about this method and its applications right here.
Read More5 Easy Ways to Tell Salt and Protein Crystals Apart
How do you make sure that the crystals you have grown are of your target protein? Can you tell salt and protein crystals apart without using X-ray diffraction? Yes, you can. Read on to discover five easy ways to distinguish between salt and protein crystals.
Read MoreChoosing the Right Bacterial Strains for Your Lab
Whether you’re simply seeking competent E. coli for a transformation experiment or building a panel intended for a whole project, it’s vital that you pick the right strain for your experiment. Find out more in our complete guide to choosing bacterial strains.
Read MoreMeasuring Beyond the Limitations of ELISAs
Measuring Beyond the Limitations of ELISAs Available On Demand Speaker Craig Lanio Field Application ScientistMilliporeSigma Craig is a Field Application Scientist with MilliporeSigma and has been part of the Immunoassay Platform Solutions team for almost 15 years. Prior to coming to MilliporeSigma, he was a scientist with multiple biopharma companies where he participated in every…
Read MoreDIY Electrocompetent E. coli
Making good quality electrocompetent E. coli is very easy. One morning’s work (with a bit of work ahead of time) is all it takes.
Read MoreA Step-by-Step Guide to the Quantitative Beta-galactosidase Assay for Y2H Screening
Want to know not only if your proteins bind but quantify the interaction? We walk you through how to perform a quantitative yeast two-hybrid assay.
Read MoreBeat Back the Bubbles: 6 Ways to Remove Excess Detergent from Your Membrane Protein Sample
Excess detergent in your membrane proteins samples can cause you serious headaches. We’ve got you covered with 6 ways you can remove excess detergent from membrane proteins.
Read MoreHow SDS-PAGE Works
Knowing how SDS-PAGE works means that you can troubleshoot any issues in your experiment and tweak the setup to get publication-worthy figures. Find out how it works here.
Read MoreGetting Started with Immunohistochemistry
Immunohistochemistry isn’t just a useful clinical tool, it also has great applications as a basic research tool. We’ll walk you through the immunohistochemistry basics to get you off to a flying start.
Read MoreWorking with Membrane Proteins: Tips for Expressing, Extracting, and Purifying Your Membrane Protein Sample
Working with membrane proteins can be tricky. Read on to get tried-and-tested tips and tricks for expressing, extracting, and purifying these water-phobic proteins.
Read MoreConstant Current or Voltage in SDS-PAGE: The Great Debate
It’s not always easy deciding whether to run electrophoresis at a constant voltage, current, or power. Here, we outline the differences to help you make an informed decision.
Read MoreIL-13 is a Pathogenic Driver of COVID-19
IL-13 is a Pathogenic Driver of COVID-19 Available On-Demand Speaker Alexandra Donlan Graduate StudentUniversity of Virginia Alexandra received her bachelor’s degree in Biological Sciences from Florida State University, where she studied the role of exosomes in the oncogenesis of Epstein–Barr virus in the lab of Dr David Meckes. She is working towards her PhD at…
Read MoreDevelopment of ultrasensitive immunoassays for SARS-CoV-2 antibody detection
Development of ultrasensitive immunoassays for SARS-CoV-2 antibody detection Available On Demand Speaker Rosemary Sweetwood Manager, CAST Sample Testing, Scientist II CAST Custom Assay DevelopmentMilliporeSigma Rosemary Sweetwood has worked with SMC™ technology for over 7 years in diagnostic development, assay development, and custom manufacturing, as well as managing clinical sample testing projects for our SMC™ Sample…
Read MoreIgG Antibodies Against SARS-CoV-2 Correlate to Days from Symptom Onset in COVID-19 Positive Patients
IgG Antibodies Against SARS-CoV-2 Correlate to Days from Symptom Onset in COVID-19 Positive Patients Available On Demand Speaker Mary Young Research TechnicianUniversity of Virginia, School of Medicine Mary Young has her Bachelors of Science in Biology from Elon University. She joined the Petri Lab 3 years ago as a research technician helping with several projects,…
Read MoreSynthetic Peptides Part 2: Tips and Tricks for Peptide Synthesis
Deciding on the right peptide sequence can make or break your experiment. Find out what to keep in mind when designing a synthetic peptide.
Read MoreDetecting Post-Translational Modifications
A quick start guide to methods of assessing protein post-translational modifications
Read MoreA-Z of Post-Translational Modifications
You might know the most common post-translational modifications, but there are many more than just phosphorylation and ubiquitination – come and test your knowledge!
Read MoreSynthetic Peptides and Their Uses: Part 1
Are you studying a small peptide or protein? Learn whether using synthetic peptides can save you hours of transfection, protein expression, and purification.
Read MoreAn Experimental Toolkit for Measuring Autophagic Flux
How good is your cell at recycling? In this guide, we explain what autophagic flux is, why you need to study it, and methods to get you started.
Read MoreTop 5 Things to Keep in Mind When Detecting Non-Histone Lysine Acetylation
Lysine acetylation isn’t just for histones. Read on to find out how to determine whether your favorite protein is lysine acetylated.
Read MoreRecombinant Protein Expression: How to Choose the Right Affinity Tag
Using the right affinity tag can make protein purification a breeze. Read more to find out which tag is right for you.
Read MoreImmune Responses in Severe COVID-19 Patients
Speaker Professor Dexi Chen, the Director of the Beijing Institute of Hepatology, present data on immune responses in severe COVID-19.
Read MoreA Guide to Gradient Gels: The Why’s and How’s
Fret no more over fuzzy bands! We uncover how gradient gels can give you better results, and maximize your precious samples when performing SDS-PAGE
Read MoreAssay Development for Quantification of Low-abundance Proteins Using Single Molecule Counting
Assay Development for Quantification of Low-abundance Proteins Using Single Molecule Counting On-Demand Sponsored by Sarah HamrenMilliporeSigma In this tutorial you will find: How MilliporeSigma’s Single Molecule Counting (SMC™) platform can be used to detect even very low levels of Huntingtin protein How to reach fM levels of sensitivity detecting both mHTT and total HTT Development…
Read MoreBiology Beyond the Cell: the How and Why of Cell-Free Systems
Are your cell membranes more of a hindrance than a help? Struggling to sneak your DNA inside? Why not break out and take your expression or metabolism studies cell-free. Find out the what, how and why of cell-free systems.
Read MoreFractionating Proteins by Solubility: or, How I Learned to Stop Worrying and Love the Ultracentrifuge
Does the term “ultracentrifuge” make your heart begin to race? Fear not! This article will provide you with tried and true tips on how to handle this piece of machinery like a boss.
Read MoreIcky Sticky: Heat Shock Protein Contamination during Protein Purification
Purifying a new protein is no easy feat. Finding combinations of protein purification buffer, salt, detergent, and stabilizing agent to get high yields of squeaky-clean protein can become tedious. Few things are as bothersome during this process as Heat Shock Protein (HSP) contamination. But worry not, we’ve got some handy tips to avoid HSP contamination…
Read MoreSpinning Around: Tips and Tricks for Using Centrifugal Filters
One of the most widespread protein laboratory accessories are the MWCO (molecular weight cut-off) centrifugal filters which are commonly used for concentrating protein, as well as DNA. They are available commercially with different cut-offs including 3kDa, 30kDa, 50kDa, 100kDa, and so on. These little devices are expensive and hence demand proper usage and care to…
Read MoreDesigning a LOV2 Domain-Based Toolkit
Cell Biology is entering the Age of Light with a spectrum of new optogenetics tools available to control protein function using light. Once the remit of neuroscientists [1], the past decade has yielded a bounty of novel light-controllable domains that are now being leveraged to illuminate the dark corners of basic cell biology [2,3]. The…
Read MoreSo You Think You Can PEMSA? A Guide to Protein Electrophoretic Mobility Shift Assay
Studying nucleic acid interactions with proteins can be accomplished using a rapid and efficient electrophoretic mobility shift assay (EMSA). This method is essentially an agarose gel electrophoresis technique that detects protein:nucleic acid interactions, as the mobility of the labeled nucleic acid will be retarded if bound to a protein (compared to unbound DNA). A lesser-known…
Read MoreThe Mysterious World of Macrophages: How to Harness Them for Your Research
The Mysterious World of Macrophages: How to Harness Them for Your Research In this tutorial, you will learn: How to work with mouse and human macrophages The best methods for culturing macrophages The difference between M1 and M2 macrophages, and how to differentiate each population from monocytes What data to expect based on the conditions…
Read MoreHow it Works: Storage Phosphor Screen
Radioactivity is still the most sensitive detection mechanism for many macromolecules and enzymatic activities. In graduate school, I performed countless radioactive kinase assays, watching the radioactive gamma 32P of ATP get transferred to my autophosphorylating receptor of interest, and then separating my protein from free hot ATP on a gel. The gel is dried, covered…
Read MoreAn Exploration of the Sigmoidal Curve – Math for the Rest of Us
ELISA (Enzyme-Linked Immunosorbent Assay) is the heartbeat of many labs in the research world, owing to its simplicity and its ability to answer a very basic question: how much of protein/peptide/antibody is in my sample? More specifically, it can be used to answer such questions as: How much IgG is in the serum after I…
Read MoreWill the Real NP-40 Please Stand Up? Chemical Nomenclature Woes.
One day, a colleague stopped by my workbench to ask which detergent would not break the nuclear membrane. Based on my previous experience using gentle detergents in lysis buffers, I replied, “NP-40”. However, we had two brands of NP-40. A closer look at the datasheets revealed that the chemical names were different even though they…
Read MoreHow Protein Adhesion Can Affect Your Experiments and What to Do About It
Commonly, no one thinks much about how the surfaces of labware (like microcentrifuge tubes, test tubes, dishes, etc.) can affect experimental results. We might know when we need to use glass versus plastic. Or we might know that certain chemicals, like chloroform, will interact with some plastic polymers, and you must use polymers that are…
Read MoreFive Methods for Assessing Protein Purity and Quality
If you’ve ever worked with proteins in the lab, you probably know just how critical protein purity and quality are for downstream applications. In this article, we’ll review the multitude of problems that are encountered with ‘bad’ protein samples and how you can analyze the purity and integrity of your favorite protein prior to using…
Read MoreLet’s Come Clean: Why Quality Control for Purified Protein Matters
If you are a Michelin star chef, then your first priority for preparing your signature dish is to use the best ingredients. One rotten potato or one slightly overripe strawberry could ruin not just a dish, but also your reputation. In the laboratory we are (mostly) not cooking rotten potatoes, but we are doing delicate…
Read More8 Tricks to Improve Your Negative Staining of Membrane Proteins
Negative staining of proteins is a versatile tool for structural biology. The sample preparation protocol is simple: the sample is embedded in a heavy metal stain that gives rise to increased specimen contrast. Thus, negative staining is a very convenient method to assess sample homogeneity, formation of macromolecular complexes, or quality of protein preparation. Conventional…
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