The SPR (Surface Plasmon Resonance) binding assay is a powerful technique used to study molecular interactions in real-time without the need for labeling. It is commonly employed to analyze the kinetics, affinity, and specificity of interactions between biomolecules, such as protein-protein, protein-DNA, or protein-small molecule interactions. Principle of SPR Binding Assay In an SPR assay, …

The RNA SELEX (Systematic Evolution of Ligands by EXponential enrichment) protocol is designed to select RNA aptamers that bind to a specific target molecule. RNA SELEX is similar to DNA SELEX, but with additional steps to transcribe RNA from a DNA library and manage RNA’s inherent instability. Below is a general protocol for selecting RNA aptamers using SELEX:  Materials …

DNA and RNA aptamers are both oligonucleotide molecules that can fold into unique 3D structures and bind to specific target molecules with high affinity and specificity. However, there are several key differences between them that influence their use, stability, and application in various fields. Here’s a comparison between DNA aptamers and RNA aptamers: Structure and Chemistry DNA Aptamers: Made …

The SELEX (Systematic Evolution of Ligands by EXponential enrichment) protocol is a method to identify DNA aptamers that specifically bind to a target molecule, such as proteins, small molecules, or even whole cells. Below is a general protocol for DNA aptamer SELEX:  Materials Required Starting DNA library: A pool of single-stranded DNA (ssDNA) molecules with randomized sequences (typically 10^13 to …

RNA and DNA aptamers are both short, single-stranded oligonucleotides that can fold into specific 3D structures to bind with high affinity and specificity to a target molecule. However, there are some key differences between them in terms of structure, stability, and functionality. Here’s a comparison: Chemical Structure    RNA Aptamers Made up of ribonucleotides. RNA contains a hydroxyl …

The SELEX (Systematic Evolution of Ligands by Exponential enrichment) protocol is a method used to identify aptamers—nucleic acid molecules (DNA, RNA, or modified versions) that can bind specifically to a target molecule. In the context of cell SELEX, the protocol is adapted to select aptamers that can bind specifically to cell surface markers, which is particularly useful …

Aptamer structural analysis involves the study of the three-dimensional (3D) structure of aptamers and their interactions with target molecules. This analysis is essential for understanding how aptamers bind to their targets with high affinity and specificity. The structural features of aptamers, such as loops, bulges, stems, and G-quadruplexes, are critical for their function. Here are the …

SELEX (Systematic Evolution of Ligands by EXponential enrichment) protocol used for aptamer selection. The process involves several steps, including library preparation, target binding, washing, elution, amplification, and multiple rounds of selection to isolate high-affinity aptamers. Materials Target molecule: Protein, small molecule, cell, etc. Aptamer library: Single-stranded DNA (ssDNA) or RNA, typically containing 10^12–10^15 random sequences flanked by …

Aptamer screening methods are crucial for selecting aptamers with high affinity and specificity for a target molecule. The most common and widely used screening technique is Systematic Evolution of Ligands by EXponential enrichment (SELEX), but there are also several variations and alternative methods. Below are the key aptamer screening techniques: SELEX (Systematic Evolution of Ligands by …

Aptamer discovery and technology have made significant strides in recent years, driven by their ability to target a wide range of molecules with high specificity and affinity. The systematic approach to discovering aptamers, combined with advancements in technology, has broadened their application in fields like therapeutics, diagnostics, and biosensing. Here’s a comprehensive analysis of aptamer discovery …