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class="color-scheme-turquoise block block-system block-system-breadcrumb-block"> <div class="container"> <nav class="breadcrumb" role="navigation" aria-labelledby="system-breadcrumb"> <ol> <li><a href="https://www.reactionbiology.com">Home</a></li> <li>Services</li> <li>Biophysical Assays</li> </ol> </nav> </div> </div> <div class="view-container view-simple-page-conent"> <div class="container"> <article id="post-3205" class="post-3205 page type-page status-publish hentry" itemtype="https://schema.org/CreativeWork" itemscope=""> <div class="entry-content entry-content-servises "> <h1>Biophysical Assay Services for Drug Discovery</h1> <p>Biophysical assays enable understanding of the drug-target interaction on a molecular level. As a CRO we offer our clients primary and secondary biophysical screening options for the determination of the residence time, mechanism of action, and kinetics, all of which are crucial for the therapeutic action of a drug. Biophysical screening is thus essential for the selection of analytes with the most promising properties for the next stage of drug discovery.</p> <p>Our team of biophysical assay experts, together with an array of cutting-edge instrumentation, is available for hit identification, hit-to-lead, and lead characterization activities tailored to the needs of your research project.</p> <p>Reaction Biology offers off-the-shelf biophysical assays for high-throughput screening, custom assay development, and optimization as well as integrated projects in close interaction with our team of biophysical assay experts.</p> </div> </article> </div> </div> <div id="_anchor" class="paragraph weiss black paragraph--type--paragraph-container paragraph--view-mode--default"><div id="ba-id" class="paragraph text-top-left images-0 headline-left contact-buttons- paragraph--type--text-with-image paragraph--view-mode--default"><div class="container center"><h2>Four biophysical assays are offered at Reaction Biology CRO</h2> <div class="clearfix text-formatted field field--name-field-text field--type-text-long field--label-hidden field__items"> <table> <thead> <tr> <th></th> <th>Surface Plasmon Resonance (SPR)</th> <th>Isothermal Titration Calorimetry (ITC)</th> <th>Microscale Thermophoresis (MST)</th> <th>Thermal Shift Assay (TSA)</th> </tr> </thead> <tbody> <tr> <td>Physical Principle</td> <td>Optical measurement that detects molecular mass<br /> changes of the target upon analyte binding</td> <td>Measures the heat released or absorbed during<br /> analyte binding to a target</td> <td>Measures the changes in the motion of target molecules<br /> along microscopic temperature gradients upon analyte<br /> binding</td> <td>Monitors the shift in melting temperature of a target upon<br /> analyte binding</td> </tr> <tr> <td align="center">Binding Affinity<br /> Determination</td> <td style="text-align: center; vertical-align: middle;"><span class="fa fa-check"> </span></td> <td style="text-align: center; vertical-align: middle;"><span class="fa fa-check"> </span></td> <td style="text-align: center; vertical-align: middle;"><span class="fa fa-check"> </span></td> <td style="text-align: center; vertical-align: middle;">X</td> </tr> <tr> <td>Parameters Measured</td> <td>Dissociation constant (KD)<br /> Association rate constant (kon)<br /> Dissociation rate constant (koff)</td> <td>Dissociation constant (KD)<br /> Binding enthalpy (ΔH)<br /> Binding stoichiometry</td> <td>Dissociation constant (KD)</td> <td>Shift in melting temperature (ΔTm)</td> </tr> <tr> <td>Capacity</td> <td>Medium to high throughput</td> <td>Low throughput</td> <td>Medium throughput</td> <td>High throughput</td> </tr> <tr> <td>Sample Requirements</td> <td>Purified target and agents required</td> <td>Purified target and agents required</td> <td>Purified target and agents required in most cases</td> <td>Purified target and agents required</td> </tr> <tr> <td>Dynamic Ranges</td> <td>pM to mM</td> <td>pM to mM</td> <td>pM to mM</td> <td>N/A</td> </tr> <tr> <td>Advantages</td> <td>Provides kinetic parameters (on/off rates) and is<br /> measured in real-time</td> <td>Provides thermodynamic parameters and binding<br /> stoichiometry</td> <td>Wide range of targets including small molecules and large<br /> macromolecular complexes</td> <td>Fast and inexpensive</td> </tr> <tr> <td>Immobilization</td> <td>Target immobilized to the sensor chip</td> <td>In solution</td> <td>In solution</td> <td>In solution</td> </tr> <tr> <td>Labeling</td> <td>Label-free</td> <td>Label-free</td> <td>Fluorescent labeling of the target required</td> <td>Label-free</td> </tr> </tbody> </table> </div> </div></div><div id="ba-id2" class="paragraph paragraph--type--block-reference paragraph--view-mode--default"><div class="container center"><div class="text-wrapper"><div class="color-scheme-violetblue block block-subpages-overview block-subpages-overview-block"> <div class="teaser"> <div class="teaser_title"><a href="/services/biophysical-assays/surface-plasmon-resonance-spr">Surface Plasmon Resonance (SPR)</a></div> <div class="teaser_text"> <p>SPR is a highly sensitive technique for accurate measurement of the interactions of two biomolecules with respect to binding kinetics and affinity as well as binding specificity.</p> </div> </div> <div class="teaser"> <div class="teaser_title"><a href="/services/biophysical-assays/isothermal-titration-calorimetry-itc">Isothermal Titration Calorimetry (ITC)</a></div> <div class="teaser_text"> <p>ITC is a solution based assay that measures the heat released or absorbed as the result of a chemical reaction.</p> </div> </div> <div class="teaser"> <div class="teaser_title"><a href="/services/biophysical-assays/microscale-thermophoresis-mst">Microscale Thermophoresis (MST)</a></div> <div class="teaser_text"> <p>MST assays measure the motion of molecules along microscopic temperature gradients that changes upon ligand binding.</p> </div> </div> <div class="teaser"> <div class="teaser_title"><a href="/services/biophysical-assays/thermal-shift-assay-tsa">Thermal Shift Assay (TSA)</a></div> <div class="teaser_text"> <p>Thermal shift assays measure the thermal stability of a target protein and the increase in protein melting temperature upon the binding of a stabilizing agent. 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