Resources

Proteomics Databases



Metabolomics Databases

• • What Is Targeted Quantitative Metabolomics?

  Targeted quantitative metabolomics is a research strategy in metabolomics characterized by the predefined selection of metabolites and their precise quantification. This approach employs a predetermined metabolite list and leverages highly sensitive, selective analytical platforms, such as liquid chromatography–tandem mass spectrometry (LC–MS/MS) or gas chromatography–mass spectrometry (GC–MS), to achieve accurate measurements of the absolute concentrations or relative abundances of specific metabolit......

• • How to Determine Molecular Weight?

  What Is Molecular Weight? Molecular weight (MW), also referred to as relative molecular mass, is defined as the ratio of the mass of a molecule to one-twelfth of the mass of a carbon-12 atom, with units of Dalton (Da) or g/mol. In practical applications, particular attention is often given to the exact molecular mass, which is calculated based on the precise isotopic masses of constituent atoms and is especially critical in mass spectrometric analysis.   Summary of Common Methods for Determining Molec......

• • What Does the Olink NPX Value Represent? Guidelines for Accurate Interpretation of Protein Expression Data

  In Olink proteomics analysis based on the Proximity Extension Assay (PEA), the primary quantitative metric obtained is the NPX (Normalized Protein eXpression) value. NPX is Olink’s proprietary unit that reflects the relative abundance of target proteins. Following rigorous normalization, background subtraction, and log₂ transformation, NPX values enable valid comparisons across samples and assay batches. A precise understanding of NPX and its interpretation is essential for ensuring the reliability of .....

• • How to Choose the Right Method for Host Cell Protein Detection?

  In the research, development, and manufacturing of biopharmaceuticals, recombinant protein expression systems represent a fundamental enabling technology. A consequential challenge is the presence of host cell proteins (HCPs), a category of process-related impurities that must be stringently controlled. HCPs are endogenous proteins released from production host cells during expression, cell lysis, and cultivation. Although typically present only at trace levels in the final product, their potential ........

• • Challenges and Innovations in Membrane Protein Structure Determination

  Membrane proteins act as the communication hubs and molecular conduits between cells and their external environment, playing pivotal roles in signal transduction, ion transport, and molecular exchange. They account for over 60% of known drug targets and represent central subjects in drug discovery, bioengineering, and vaccine design. With recent advancements, membrane proteins are no longer considered inaccessible to structural biology. Breakthroughs in cryo-electron microscopy (Cryo-EM), coupled with .....

• • How to Perform High-Throughput Proteomics Analysis of Lactylation Modifications?

  Protein lactylation represents a novel mechanistic link between lactate metabolism and epigenetic regulation. With growing interest in its roles in immunometabolism, stem cell differentiation, and the tumor microenvironment, there is an urgent need to establish a systematic, high-throughput platform for detecting lactylation modifications, enabling precise characterization of their modification landscapes and dynamic changes. However, inherent technical challenges, such as low abundance, weak specificity...

• • What Is Phosphoproteomics?

  Phosphoproteomics is a critical subdiscipline of proteomics dedicated to the systematic investigation of protein phosphorylation within cells or tissues. Phosphorylation, one of the most prevalent and significant post-translational modifications (PTMs), involves the covalent attachment of a phosphate group to specific amino acid residues, typically serine (Ser), threonine (Thr), or tyrosine (Tyr), catalyzed by kinases. This modification regulates protein activity, structural conformation, subcellular ......

• • What Is A Disulfide Bond in Proteins?

  In the realm of protein science, the disulfide bond, although formed simply by a linkage between two sulfur atoms, plays a critical role in maintaining both the structural integrity and the functional activity of proteins. This article provides an in-depth scientific examination of disulfide bonds in proteins, aiming to elucidate the nature of this subtle yet essential covalent structure. Definition of a Disulfide Bond A disulfide bond is a covalent linkage formed between the sulfur atoms (–SH groups) of...

• • How to Efficiently Conduct Olink Proteomics?

  In biomarker discovery, clinical cohort investigations, and pharmaceutical development, the Olink proteomics platform, based on Proximity Extension Assay (PEA) technology, offers reliable data support with minimal sample input, high sensitivity, and substantial high-throughput capacity. To ensure both research efficiency and data reliability, research teams must make informed decisions at multiple stages, including study design, experimental execution, and data analysis. This article systematically ........

• • How to Choose the Appropriate Strategies for Ubiquitinated Protein Enrichment?

  Ubiquitination, a key reversible post-translational modification of proteins, plays a central role in various biological processes, including cell cycle regulation, protein degradation, DNA damage repair, and signal transduction. The comprehensiveness and precision of ubiquitination research are often contingent upon the use of efficient and highly selective ubiquitinated protein enrichment strategies. Requirements for these strategies vary considerably depending on the experimental objectives, sample .....