Resources
Proteomics Databases
Metabolomics Databases
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• Protein Structure Determination Techniques and Applications
Protein structure determination techniques and applications are foundational to elucidating the molecular mechanisms of life. These methodologies, encompassing X-ray crystallography, nuclear magnetic resonance (NMR) spectroscopy, and cryo-electron microscopy (Cryo-EM), have profoundly impacted research in biomedicine and pharmaceutical innovation. By leveraging these advanced techniques, researchers can uncover intricate protein architectures essential for biological function and therapeutic intervent......
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Inductively Coupled Plasma Metal Analysis (ICP Metal Analysis) is a technique for detecting and quantifying trace elements and metal contaminants in samples. The principle involves atomizing and ionizing the sample with an inductively coupled plasma, followed by detection of the ions using mass spectrometry. ICP Metal Analysis is renowned for its high sensitivity and multi-element detection capability, allowing for the identification of dozens of elements at ultra-low concentrations. This makes it wi......
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• How to Determine the Amino Acid Sequence of Unknown Proteins
The process to determine the amino acid sequence of unknown proteins involves a structured series of steps, including protein purification, enzymatic digestion, LC-MS/MS analysis, and database searching. Protein Purification To enable accurate analysis, the target protein must first be purified from complex biological samples. Techniques such as centrifugation, precipitation, and chromatography are commonly employed to isolate the protein of interest. Enzymatic Digestion Proteins are enzymatically......
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• Circular Dichroism of Proteins
Circular Dichroism of Proteins is a widely used spectroscopic technique in biochemistry and structural biology, primarily aimed at studying protein secondary structure and conformational changes. The CD spectra arise from the differential absorption of left- and right-handed circularly polarized light by chiral molecules, a phenomenon known as circular dichroism. Proteins, which contain chiral amino acid sequences, exhibit specific CD signals when interacting with circularly polarized light. These si......
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• Isoelectric Focusing Electrophoresis
Isoelectric focusing electrophoresis (IEF) is a technique used to separate proteins or other amphoteric electrolytes according to their isoelectric point (pI). The isoelectric point refers to the pH at which a protein carries no net charge. In this process, samples undergo electrophoresis in a gel with a pH gradient. Under the influence of an electric field, proteins migrate until they reach their isoelectric point, where they stop moving. IEF is an efficient method for separating complex protein mix......
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Protein glycosylation is the process by which glycan moieties are covalently attached to the amino acid side chains of proteins, representing a crucial form of post-translational modification (PTM). This widespread biological phenomenon plays a key role in various biological functions. It is involved in protein folding, stability, and functional regulation, and also influences critical biological processes such as cell recognition, signal transduction, and immune responses. The diversity and complexi......
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Differential Scanning Calorimetry (DSC) is a sophisticated analysis DSC technique used to study the thermal properties of materials. It is widely applied across multiple scientific disciplines, including biochemistry, materials science, and food science. The principle of analysis DSC involves measuring the difference in heat flow between a sample and a reference material as the temperature is varied. This process provides valuable thermodynamic data, allowing researchers to gain insights into phase t......
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Mass spec analysis is a vital tool for determining molecular weights and elucidating compound structures. By measuring the mass-to-charge ratio (m/z) of ionized molecules or atoms, this technique enables researchers to accurately determine the molecular weight, structure, composition, and abundance of compounds. Its high sensitivity, specificity, and rapid analytical capabilities have made mass spec analysis indispensable across multiple fields, including drug development, environmental monitoring, f......
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• Multiple Reaction Monitoring
Multiple reaction monitoring (MRM) is a highly sensitive and specific analytical technique based on mass spectrometry, widely used for targeted analysis of complex biological samples. MRM works by selecting specific ion pairs-combinations of parent ions and product ions—to achieve both quantitative and qualitative analysis of target substances. Compared to traditional mass spectrometry, MRM provides significant advantages in terms of sensitivity and specificity, especially for detecting target analyt......
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• Tandem Mass Spectrometry in Proteomics Research
Tandem mass spectrometry (TMT) is a quantitative analysis technique widely used in proteomics research. TMT enables the relative quantification of multiple samples in mass spectrometry analysis through chemical labeling. This technique uses isotopically labeled chemical reagents that react with peptides in the sample, imparting unique mass tags to each sample. During the mass spectrometry process, these tags generate distinct fragment ion signals, allowing for direct comparison of protein relative ab......
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