Single Domain Antibody (SdAb) Affinity Maturation Service

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We are committed to providing highly customized comprehensive solutions with the best quality to advance your projects. </p> <b class="Highlights_tit">Highlights</b> <ul class="HighlightsArea"> <li class="col-md-6 col-lg-6 col-sm-6"> <img src="static/images/Abouts-menu-lights-pic-1.jpg" srcset="static/images/Abouts-menu-lights-pic-1.webp 1x" width="200" height="131" loading="lazy"><a href="aboutus.html" class="bannerbutton"> <i class="fa fa-angle-right"></i>About CBL </a> </li> <li class="col-md-6 col-lg-6 col-sm-6"> <img src="static/images/Abouts-menu-lights-pic-2.jpg" srcset="static/images/Abouts-menu-lights-pic-2.webp 1x" width="200" height="131" loading="lazy"><a href="contactus.html" class="bannerbutton"> <i class="fa fa-angle-right"></i>Contact Us </a> </li> </ul> </li> </ul> </div> </div> </li> </ul> <script> window.addEventListener('load',function(){ var arr = ['/drug-discovery/therapeutics/','/bioconjugation/','/adc/']; $('.mennav ul li a').each(function(){ var $this = $(this); var href = $this.attr("href").toLocaleLowerCase(); $.each(arr, function(index, value) { if (href && href.startsWith(value)) { $this.attr('target', '_blank'); } }); }); }); </script> </div> <div class="top-search search-group"> <div class="col-md-5 col-sm-6"> <label class="radio-inline"><input type="radio" name="search" class="rdo_productsearch" value="product" data-type="product" placeholder="Please input cat#, product name, abbr, or keywords."> Product</label> <label class="radio-inline"><input type="radio" name="search" class="rdo_servicesearch" value="service" data-type="service" placeholder="Please input your keywords."> Service</label> <label class="radio-inline"><input type="radio" name="search" class="rdo_googlesearch" value="google" data-type="google" placeholder="Please input your keywords." checked="checked"> Keyword</label> </div> <div class="col-md-7 col-sm-6 search-div"> <input id="keys" name="keys" placeholder="Please input your keywords." class="search-input"> <div class="selectItems"></div> <span class="search_btn"><i class="fa fa-search"></i></span> </div> </div> </div> <div class="searchShow"> <div class="searchtopbg"></div> <span class="searchclosed"><i class="fa fa-times"></i>Close</span> <div class="addsearch search-group"></div> </div> <div class="banner_inpage services_bg_2"> <div class="auto-container small_content-width about_container"> <ul class="bread-crumb clearfix"> <li><a href="/">Home</a></li> <li><a href="javascrpt:void(0)">Engineering</a></li><li><a href="/engineering-services.html">Property Optimization</a></li><li><a href="/antibody-affinity-maturation.html">Affinity Maturation</a></li> <li>Single Domain Antibody (SdAb) Affinity Maturation</li> </ul> <p>"Creative Biolabs is committed to providing highly customized comprehensive solutions with the best quality to advance our global clients’ projects."</p> </div> </div> <script> window.addEventListener('load', function () { if (($('.bread-crumb li:last-child').text()) == "Peer-Reviewed Publications") { $(".banner_inpage").addClass("peer-reviewed-publications_bg").removeClass("services_bg_2"); } if ($(window).hasClass('bread-crumb')) { if ($(".bread-crumb").html().indexOf("RESOURCE") > -1) { $(".pronote").hide(); } if ($(".bread-crumb").html().indexOf("Careers") > -1) { $(".pronote").hide(); } } }); </script> <div class="small_content-width services-container"> <div class="col-md-9"> <div class="inpage_section_title"> <h1>Single Domain Antibody (SdAb) Affinity Maturation Service</h1> </div> <div class="page-tab"> <span onclick="window.location.href=window.location.pathname+'#tab1'">Services</span> <span onclick="window.location.href=window.location.pathname+'#tab2'">Published Data</span> <span onclick="window.location.href=window.location.pathname+'#tab3'">FAQ</span> <span onclick="window.location.href=window.location.pathname+'#tab4'">Resources</span> </div> <script> window.addEventListener('load',function(){ page_tab_margin() page_tab_css(); })</script> <h2 class="h2_tit page_tab_margin" id="tab1"> SdAbs Affinity Maturation Services </h2> <p> As a recognized leader in the field of phage display and antibody engineering, Creative Biolabs is experienced in conducting affinity maturation projects, with affinity maturation of single domain antibodies in particular. </p> <p> Although single domain antibodies isolated from antibody libraries derived from gene synthesis and immunized or naïve animals generally exhibit reasonable affinity, it is often desirable to further increase their affinity. Quantitative library sorting by phage display or yeast surface display is used to improve the affinity of single domain antibodies. In particular, we have developed a proprietary DNA mutagenesis technique that is able to create a huge number (e.g., 1010) of variants of the parental antibody with defined positions mutated. In combination with our first-class phage display antibody library construction and screening technologies, 10–100 fold increase in affinity for parental single domain antibodies of low nM affinity is frequently achieved. This is often possible for other companies for antibodies of 100 nM affinity or worse. </p> <p class="show-center"> <img loading="lazy" src="../static/img/sdAb-Affinity-Maturation.JPG" width="450" height="246" alt="Fig. 1 Structure of the activated β2AR. (Aaron M Ring, 2013)" />Fig. 1 Structure of the activated β2AR. (Aaron M Ring, 2013) </p> <h2 class="h2_tit page_tab_margin" id="tab2"> Published Data </h2> <ul class="ullist"> <li> <strong>Affinity Maturation of HER2-targeted sdAbs</strong> </li> </ul> <p class="show-center"> <img loading="lazy" src="../static/img/1-1-2-7-affinity-maturation-for-sdab-2.jpg" width="800" height="329" alt="Fig. 2 Affinity maturation of HER2-targeted nanobodies by phage display and identification of VHH-Fc. (Xinlin Liu, 2023)" />Fig. 2 Affinity maturation of HER2-targeted nanobodies by phage display and identification of VHH-Fc. (Xinlin Liu, 2023) </p> <p> Human epithelial growth factor receptor 2 (HER2) plays a carcinogenic role in many tumors. In this study, using the synthetic single-domain antibody library and affinity maturation, four high affinity and specific anti-HER2 single-domain antibodies were identified. The chimeric HER2-ECD protein showed that these single domain antibodies could recognize three different HER2-ECD domains. In addition, to further study the potential therapeutic benefits, scientists constructed VHH-Fc fuses and found that they can promote internalization and show moderate growth inhibition. Compared with the single traditional monoclonal antibody combination, the VHH-Fc combination or its combination with traditional monoclonal antibodies showed greater or equivalent anti-tumor activity in ligand-independent and ligand-driven tumors. This result provides anti-HER2 sdAbs with high affinity and non-overlapping epitope recognition. </p> <ul class="ullist"> <li> <strong>High Affinity Anti-IL-6R SdAb ALX-0061 Development</strong> </li> </ul> <p class="show-center"> <img loading="lazy" src="../static/img/1-1-2-7-affinity-maturation-for-sdab-3.jpg" width="800" height="253" alt="Fig. 3 Acute phase response parameters in a cynomolgus monkey model of inflammation. Effect of a single dose of ALX-0061 on different acute phase response parameters is shown. (Maarten Van Roy, 2015)" />Fig. 3 Acute phase response parameters in a cynomolgus monkey model of inflammation. Effect of a single dose of ALX-0061 on different acute phase response parameters is shown. (Maarten Van Roy, 2015) </p> <p> Interleukin-6 (IL-6) plays an important role in the pathogenesis of different diseases, including rheumatoid arthritis (RA). A single domain antibody is a therapeutic protein based on the smallest functional fragment of a pure heavy chain (VHH) antibody, which exists naturally in camelidae. In this study, the researchers described the problems related to the development of the single domain antibody ALX-0061, which consists of only two domains sufficient to give the desired properties <em>in vitro</em> and <em>in vivo</em>. One domain of ALX-0061 is targeted at IL-6R to inhibit the pro-inflammatory activity of the IL-6 pathway. The second domain can improve the pharmacokinetic properties of nanoantibodies by binding to human serum albumin. This bi-specificity constitutes a small structure with high efficacy, as well as promising competitive characteristics and <em>in vivo</em> efficacy. In the cynomolgus monkey disease model, ALX-0061 showed complete inhibition of hIL-6-induced inflammatory parameters in a dose-dependent manner. </p> <script type="text/javascript"> window.addEventListener('load',function(){ faqlist(3); }); </script> <h2 class="h2_tit page_tab_margin" id="tab3"> FAQ </h2> <ol class="ollist faqlist"> <li> <span class="sFAQTit">How is the affinity maturation of single domain antibodies carried out?</span> <p> The affinity maturation of single domain antibodies is usually based on molecular evolution techniques, such as phage display or yeast display. First of all, a single domain antibody library containing random or semi-random mutations is constructed. Then, the antibody variants with higher affinity were selected by combining with the fixed antigen. In addition, computational biology methods can also be used to predict possible mutation sites so as to design antibody variants with potentially higher affinity before the experiment. These methods help to accelerate the development and optimization of antibodies and make them more effective and specific in clinical applications. </p> </li> <li> <span class="sFAQTit">What are the challenges of single-domain antibody affinity maturation?</span> <p> One of the main challenges of single-domain antibody affinity maturation is maintaining the stability and solubility of antibodies. In the process of affinity-enhanced mutation, it is possible to introduce changes that are disadvantageous to the structure of the antibody, which may lead to antibody aggregation or degradation. In addition, the improvement of affinity may sometimes affect the specificity of antibodies, that is, high-affinity antibodies may cross-react with non-target antigens. Therefore, the process of affinity maturation requires fine balance and extensive functional testing to ensure that the performance of the antibody will not be impaired by the improvement of affinity. </p> </li> <li> <span class="sFAQTit">What are the technical means of single-domain antibody affinity maturation?</span> <p> Commonly used techniques include directed evolution, mutation site analysis, and computer-aided design. Directed evolution technology through the construction of a large-scale variation library, and the use of high-throughput screening techniques such as phage display or cell surface display to find more affinity variants. Mutation site analysis is based on the existing structural and functional data and selects specific amino acid residues for mutation. Computer-aided design uses bioinformatics tools to predict the mutation points that may enhance affinity by simulating the interaction between single-domain antibodies and their antigens. </p> </li> <li> <span class="sFAQTit">How to evaluate the effect of single-domain antibody affinity maturation?</span> <p> First of all, biophysical methods such as surface plasmon resonance (SPR), enzyme-linked immunosorbent assay (ELISA), or biolayer interferometry (BLI) can be used to determine the specific values of affinity, which can provide detailed information about the binding strength and kinetics of antibodies to antigens. Secondly, cell function tests, such as inhibition tests or cytotoxicity tests, were carried out to verify whether the affinity-enhanced antibody maintained or improved its biological function. In addition, the expression level, stability, and solubility of the antibody need to be evaluated to ensure that the overall quality of the antibody meets the requirements of follow-up applications. These comprehensive assessments can ensure the success of the affinity maturation process and the functionality of the antibody product. </p> </li> <li> <span class="sFAQTit">What is the scope of the application of single-domain antibodies after affinity maturation?</span> <p> In the field of clinical medicine, these high-affinity single-domain antibodies can be used in targeted drug delivery systems to improve drug targeting and reduce side effects. They are also commonly used in cancer treatment and can effectively guide the immune system to attack cancer cells by accurately identifying and binding specific antigens on the surface of tumor cells. In addition, because of the high stability and easy modification of single-domain antibodies, they can also be used to develop rapid diagnostic tests, especially in cases where rapid diagnosis of infectious diseases or other emergency medical conditions is required. In addition, single-domain antibodies with mature affinity are widely used in the field of scientific research for the research of basic biological processes and the development of biomarkers. </p> </li> </ol> <div class="reference"> <strong>References</strong> <ol class="ollist decimal"> <li> Ring AM, <em>et al</em>. Adrenaline-activated structure of β2-adrenoceptor stabilized by an engineered nanobody. <em>Nature</em>. 2013 Oct 24;502(7472):575-579. doi: 10.1038/nature12572. Epub 2013 Sep 22. PMID: 24056936; PMCID: PMC3822040. </li> <li> Liu X, <em>et al</em>. A novel nanobody-based HER2-targeting antibody exhibits potent synergistic antitumor efficacy in trastuzumab-resistant cancer cells. Front Immunol. 2023 Oct 25;14:1292839. doi: 10.3389/fimmu.2023.1292839. </li> <li> Van Roy M, <em>et al</em>. The preclinical pharmacology of the high affinity anti-IL-6R Nanobody® ALX-0061 supports its clinical development in rheumatoid arthritis. Arthritis Res Ther. 2015 May 20;17(1):135. doi: 10.1186/s13075-015-0651-0. </li> </ol> </div> <h2 class="h2_tit page_tab_margin" id="tab4"> Resources </h2> <p> Use the resources in our library to help you understand your options and make critical decisions for your study. </p> <div class="tab_nav"> <span class="tab_choosebg">Videos</span><span>Podcasts</span><span>Infographic</span><span>Flyer</span> <span>Case study </span><span>Brochures</span> </div>  <div class="tab_cont" style="display:block;"> <div class="row pagerow_pt"> <div class="col-md-4"> <div class="pagerow_pt_unit"> <img loading="lazy" src="../static/img/a-potent-sars-cov-2-neutralizing-sdab.png" alt="Webinar: A Potent SARS-CoV-2 Neutralizing SdAb" /> </div> <a href="https://youtu.be/TOnpBGaV6RE" target="_blank">Webinar: A Potent SARS-CoV-2 Neutralizing SdAb</a> </div> <div class="col-md-4"> <div class="pagerow_pt_unit"> <img loading="lazy" src="../static/img/video-phage-display-technology.png" alt="Phage Display Technology" /> </div> <a href="https://youtu.be/mczJ3ZbpVW8" target="_blank">Phage Display Technology</a> </div> <div class="col-md-4"> <div class="pagerow_pt_unit"> <img loading="lazy" src="../static/img/video-development-of-monoclonal-antibodies-s.png" alt="Antibody Library Screening" /> </div> <a href="https://youtu.be/NGqipRkxXiY" target="_blank">Antibody Library Screening</a> </div> </div> </div>  <div class="tab_cont"> <div class="therapy_ad"> <a href="therapeutic-antibody.html"> <img loading="lazy" src="../static/img/podcasts-ad.png" width="1700" height="500" srcset="../static/img/podcasts-ad.webp 1x,../static/img/podcasts-ad.webp 2x,../static/img/podcasts-ad.webp 3x" alt="In this brand new podcast series, we will show you everything you want to know about CAR-T therapy, including the mechanism, current applications, technology limitations, and potential strategies." /></a> </div> </div>  <div class="tab_cont"> <div class="row pagerow_pt"> <div class="col-md-4"> <div 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