Introduction Aptamers are single-stranded oligonucleotides that fold into unique 3D structures to bind targets with high specificity. Often called “chemical antibodies,” they offer advantages over traditional protein binders. These molecules are discovered through SELEX (Systematic Evolution of Ligands by Exponential Enrichment), an iterative in vitro process that isolates high-affinity ligands from massive random libraries. The …
OX40 (CD134), a key costimulatory molecule in the tumor necrosis factor receptor superfamily, is crucial for enhancing T cell function and driving anti-tumor immunity, making it a significant focus in cancer immunotherapy research. Structure and Costimulatory Mechanism (i) Expression Pattern OX40 is a transmembrane glycoprotein expressed on activated T cells (peaking 48-72 hours post-activation), but …
SELEX Technology: Expert Guide to Choosing Between RNA and DNA Aptamers Overview of SELEX Technology Systematic Evolution of Ligands by EXponential enrichment (SELEX) is the gold-standard in vitro process for screening nucleic acid aptamers. This technology operates by cycling through “incubation-separation-amplification” steps to isolate high-affinity sequences from massive libraries (10¹³–10¹⁵ variants). While SELEX offers superior …
Bridging the Gap in TKI-Resistant NSCLC: The Strategic Rise of Antibody-Drug Conjugates (ADCs) Introduction The treatment landscape for Non-Small Cell Lung Cancer (NSCLC) has been revolutionized by EGFR Tyrosine Kinase Inhibitors (TKIs). However, the inevitable development of acquired resistance limits their long-term efficacy. To bridge this therapeutic gap, Antibody-Drug Conjugates (ADCs) have emerged as a …
Yeast surface display has emerged as a powerful and versatile technology for antibody discovery and protein engineering, playing a critical role in therapeutic development. By leveraging the eukaryotic machinery of yeast, this platform ensures proper protein folding and display, enabling the isolation of high-affinity binders through robust library screening. Technology Overview (i) Display Mechanism The …
Protein-protein interactions (PPIs) govern cellular communication and are prime targets for therapeutic intervention. Peptide library screening has emerged as a powerful, high-throughput strategy to dissect these interactions with precision. By systematically displaying thousands of peptide sequences, researchers can map binding epitopes, identify lead compounds, and optimize candidates efficiently. This article outlines the core strategies, technical …