Researchers having been sharing plasmids ever since there were plasmids to share. Back when I was in the lab, if you read a paper and saw an interesting construct you wished to use, you could either make it yourself or you could “clone by phone”. One of my professors was excellent at phone cloning with labs around the world and had specific strategies and tactics for getting the plasmids he wanted. Addgene makes this so much easier to share your constructs from lab to lab. Promega supports the Addgene mission statement: Accelerate research and discovery by improving access to useful research materials and information. Many of our technology platforms like HaloTag® Fusion Protein, codon-optimized Firefly luciferase genes (e.g., luc2), and NanoLuc® Luciferase are present in the repository. We encourage people to go to Addgene to get new innovative tools. Afterall, isn’t science better when we share?
I’d like to focus on some tools in the Addgene collection based on NanoLuc® Luciferase (NLuc). The creation of NanoLuc® Luciferase and the optimal substrate furimazine is a good story (1). From a deep sea shrimp to a compact powerhouse of bioluminescence, NLuc is 100-fold brighter than our more common luciferases like firefly (FLuc) and Renilla (RLuc) luciferase. This is important not so much for how bright you can make a reaction but for how sensitive you can make a reaction. NLuc requires 100-fold less protein to produce the same amount of light from a Fluc or RLuc reaction. NLuc lets you work at physiological concentrations. NLuc is bright enough to detect endogenous tagged genes generated through the CRISPR/Cas9 knock-in. NLuc is very inviting for endogenous tagging as it is only 19kDa. An example is the CRISPaint-NLuc construct (Plasmid #67178) for use in the system outlined in Schmid-Burgk, J.L. et al (2).
Two applications of NanoLuc® Technology have caught my attention through coupling the luciferase with fluorescent proteins to make better imaging reporters and biosensors. Continue reading
Live animal in vivo imaging is a common and useful tool for research, but current tools could be better. Two recent papers discuss adaptations of BRET technology combining the brightness of fluorescence with the low background of a bioluminescence reaction to create enhanced in vivo imaging capabilities.
The key is to image photons at wavelengths above 600nm, as lower wavelengths are absorbed by heme-containing proteins (Chu, J., et al., 2016 ). Fluorescent protein use in vivo is limited because the proteins must be excited by an external light source, which generates autofluorescence and has limited penetration due to absorption by tissues. Bioluminescence imaging continues to be a solution, especially firefly luciferase (612nm emission at 37°C), but its use typically requires long image acquisition times. Other luciferases, like NanoLuc, Renilla, and Gaussia, etc. either do not produce enough light or the wavelengths are readily absorbed by tissues, limiting their use to near- surface imaging.
The two papers discussed here illustrate how researchers have combined NanoLuc® luciferase with a fluorescent protein to harness bioluminescent resonance energy transfer (BRET) for brighter in vivo imaging reporters. Continue reading
A Bioluminescent Alternative
Fluorescence resonance energy transfer (FRET) probes or sensors are commonly used to measure cellular events. The probes typically have a matched pair of fluorescent proteins joined by a ligand-binding or responsive protein domain. Changes in the responsive domain are reflected in conformational changes that either bring the two fluorescent proteins together or drive them apart. The sensors are measured by hitting the most blue-shifted fluorescent protein with its excitation wavelength (donor). The resulting emission is transferred to the most red-shifted fluorescent protein in the pair, and the result is ultimately emission from the red-shifted protein (acceptor).
As pointed out by Aper, S.J.A. et al. below, FRET sensors face challenges of photobleaching, autofluorescence, and, in the case of exciting cyan-excitable donors, phototoxicity. Another challenge to using FRET sensors comes when employing optogenetic regulators to initiate the event you wish to monitor. Optogenetic regulators respond to specific wavelengths and initiate signaling. The challenge comes when the FRET donor excitation overlaps with the optogenetic initiation wavelengths. Researchers have sought to alleviate many of these challenges by exchanging the fluorescent donor for a bioluminescent donor, making bioluminescence resonance energy transfer (BRET) probes. In the three papers described below, the authors chose NanoLuc® Luciferase as the BRET donor due to its extremely bright signal. Continue reading
When I was a post-doc at UT Southwestern, I was fortunate to interact with two Nobel prize winners, Johann Deisenhofer and Fred Gilman. Johann once helped me move a -80°C freezer into his lab when we lost power in my building. I once replaced my boss at small faculty mixer with a guest speaker and had a drink with Fred Gilman and several other faculty members from around the university. Among the faculty, one professor had a cell phone on his belt, an odd sight in 1995. Fred Gilman asked him what it was and why he had it. It was so his lab could notify him of good results anytime of the day. Fred laughed and told him to get rid of it – if it’s good data, it will survive until morning.
I was reminded of this story when I read a recent paper by Bodle, C.R. et al (1) about the development of a NanoBiT® Complementation Assay (2) to measure interactions of Regulators of G Protein Signaling (RGS) with Gα proteins in cells. (Fred Gilman was the first to isolate a G protein and that led to him being a co-recipient of the Nobel Prize in 1994). The authors created over a dozen NanoBiT Gα:RGS domain pairs and found they could classify different RGS proteins by the speed of the interaction in a cellular context. The interactions were readily reversible with known inhibitors and were suitable for high-throughput screening due to Z’ factors exceeding 0.5. The study paves the way for future work to identify broad spectrum RGS domain:Gα inhibitors and even RGS domain-specific inhibitors. This is the second paper applying NanoBiT Technology to GPCR studies (3).
A Little Background…
A primary function of GPCRs is transmission of extracellular signals across the plasma membrane via coupling with intracellular heterotrimeric G proteins. Upon receptor stimulation, the Gα subunit dissociates from the βγ subunit, initiating the cascade of downstream second messenger pathways that alter transcription (4). The Gα subunits are actually slow GTPases that propagate signals when GTP is bound but shutdown and reassociate with the βγ subunit when GTP is cleaved to GDP. This activation process is known as the GTPase cycle. G proteins are extremely slow GTPases. Continue reading
Cannabinoids. What are they? Sometimes, Wikipedia can give a nice definition:
Tetrahydrocannabinol (THC), a partial agonist of the CB1 and CB2 cannabinoid receptors. Wikipedia Commons
A cannabinoid is one of a class of diverse chemical compounds that acts on cannabinoid receptors in cells that alter neurotransmitter release in the brain. Ligands for these receptor proteins include the endocannabinoids (produced naturally in the body by animals), the phytocannabinoids (found in Cannabis and some other plants), and synthetic cannabinoids (manufactured artificially).
Synthetic cannabinoids (SCs) were originally created for the scientific investigation of two cannabinoid receptors, CB1 and CB2, but have made their way to the streets as “safe” and “legal” alternatives to marijuana.
The problem is that these SCs engage the cannabinoid receptors more completely and with higher affinity than anything derived from marijuana. As a result, SCs can produce serious side effects that often require medical attention. In fact, you are 30 times more likely to seek emergency medical attention following the use of an SC than with natural cannabinoid sources like marijuana. Continue reading
Madison, WI is home for Promega, and while it is not a huge city, Madison is home to many biotech companies, fed mostly by the local, world-class University of Wisconsin-Madison. Many scientists and scientist families work, live and play near one another here. It is not uncommon for two scientists from different companies to talk to one another and discover that their respective companies have products or processes that could benefit both companies.
Case in point: Scientists at Promega have a good working relationship with Cellular Dynamics International (CDI), a biotech firm that specializes in differentiated iPSC-derived cells. We want to demonstrate that our assays work in iPSC cells and CDI wants to demonstrate the range of assays that can be performed with their iPSC-derived cells.
Differentiated iPSC cells are as close to primary cells as you can get, and primary cells are notoriously difficult to transfect due to their slow rate of growth and increased propensity for death. CDI reported great success with ViaFect™ Reagent and generously shared their data with us (see image). Continue reading
The story of ViaFect begins with Promega Custom Assay Services (CAS), a group that uses Promega technologies to construct made-to-order assays, typically in a cell line. Many projects from the CAS group involve transfecting cells with expression vectors and reporter vectors. In some instances, customers contact CAS to have an assay constructed in a difficult cell line, after attempting and failing, or experiencing difficulty building the assay themselves.
CAS projects start with a proof-of-concept experiment using transient transfection before moving on to production of a clonal, stable cell line. For difficult cell lines, the CAS group previously turned to electroporation after exhausting lipid-based transfection options. Electroporation often worked, but success came with a price—cytotoxicity. The CAS group challenged R&D to find a better solution—better transfection with low toxicity for difficult-to-use cells. The result of that challenge is the ViaFect™ Transfection Reagent. Continue reading
Most, if not all, processes within a cell involve protein-protein interactions, and researchers are always looking for better tools to investigate and monitor these interactions. One such tool is the protein complementation assay (PCA). PCAs use a reporter, like a luciferase or fluorescent protein, separated into two parts (A and B) that form an active reporter (AB) when brought together. Each part of the split reporter is attached to one of a pair of proteins (X and Y) forming X-A and Y-B. If X and Y interact, A and B are brought together to form the active enzyme (AB), creating a luminescent or fluorescent signal that can be measured. The readout from the PCA assay can help identify conditions or factors that drive the interaction together or apart.
A key consideration when splitting a reporter is to find a site that will allow the two parts to reform into an active enzyme, but not be so strongly attracted to each other that they self-associate and cause a signal, even in the absence of interaction between the primary proteins X and Y. This blog will briefly describe how NanoLuc® Luciferase was separated into large and small fragments (LgBiT and SmBiT) that were individually optimized to create the NanoBiT® Assay and show how the design assists in monitoring protein-protein interactions.
One piece of advice you will get from our Technical Services and R&D Scientists with regard to cell-based assays is to pay attention to what you are doing. Sounds obvious, but sloppiness can easily enter into the equation. Do you always count your viable cells with a hemocytometer and trypan blue exclusion before you split a culture? Do you always make sure that each well of your plate or plates contain the same number of cells? Two of our scientists, Terry Riss and Rich Moravec, published a paper demonstrating how decisions you make in experimental setup can ultimately affect the results you obtain. A natural consequence of this is difficulty replicating experiments if you didn’t pay attention to the details during the initial experimental setup.
Cell Density Per Well Affects Response to Treatment
To demonstrate how cell density can affect your data, Riss and Moravec set up parallel plates with three different cell densities of HepG2 cells and measured the response to tamoxifen. The lower the cell density per well, the more pronounced the effect of the tamoxifin on the cells. Higher density cells were more resistant to tamoxifen. Continue reading
Reporter assays using a single reporter, be it from a stable cell line or transient transfection, can benefit from normalization. Obviously, we are not talking about adding a second control reporter but normalizing to the number of live or dead cells in the well. Two cell health assays, CellTiter-Fluor™ Cell Viability Assay and CellTox™ Green Cytotoxicity Assay, are ideally suited for multiplexing with reporter assays. Continue reading