Resources

Proteomics Databases



Metabolomics Databases

• • How Does Orbitrap Technology Enable High-Accuracy Sequencing of C-Terminal Peptides?

  In proteomics research, precise sequencing of C-terminal peptides is critical for elucidating post-translational modifications, identifying degradation signals, and discovering novel functional peptide segments. The C-terminal region often harbors diverse functional motifs; however, strong structural heterogeneity, weak signal intensity, and enzymatic cleavage constraints have consistently presented significant challenges for mass spectrometric analysis of C-terminal peptides. With the advancement and .....

• • How to Analyze Glycoprotein Modifications with Top-Down Proteomics?

  Glycosylation is among the most prevalent post-translational modifications (PTMs), widely occurring in key biological macromolecules such as membrane proteins, secretory proteins, cytokines, and therapeutic antibodies. N-glycosylation and O-glycosylation are integral to protein folding, stability, cell recognition, and signal transduction. Alterations in glycosylation are frequently associated with diverse pathological conditions, including cancer, immune disorders, and neurodegenerative diseases. Owing....

• • What is Top-Down Proteomics Best Suited For? Applications and Insights

  Top-down proteomics (TDP) is an analytical strategy that directly examines intact proteins, in contrast to the bottom-up proteomics approach, which identifies and quantifies proteins through their enzymatic digestion products (typically peptides). By preserving the native state of proteins, the top-down approach enables a more comprehensive characterization of post-translational modifications (PTMs), proteoforms, and related structural information. In recent years, advances in mass spectrometry ......

• • How to Improve Quantification Accuracy in Shotgun Proteomics?

  Shotgun proteomics is extensively applied in life science research to systematically characterize the protein composition and quantify abundance changes in complex biological samples. Despite its high throughput and broad coverage, quantification accuracy is often compromised by interferences at multiple stages, thereby affecting data reproducibility and the robustness of biological interpretations. This article systematically reviews key strategies for enhancing quantification accuracy in shotgun .........

• • What is Shotgun Proteomics? A Complete Guide to Its Principles and Applications

  Shotgun proteomics is a high-throughput protein identification strategy based on mass spectrometry, widely applied in comprehensive proteomic analyses of cells, tissues, and complex microbiome samples. Characterized by its untargeted nature, unbiased detection, and deep coverage, it represents one of the mainstream approaches for exploratory proteomic data acquisition in contemporary life science research. This paper systematically examines the fundamental principles, technical workflow, and represent......

• • What Is Peptidomics? Overview of Its Workflow and Principles

  Proteomics has long been recognized as a pivotal discipline for deciphering cellular functions and elucidating disease mechanisms. In recent years, however, growing attention has been directed toward the degradation products of proteins, endogenous peptides, which harbor valuable physiological and pathological information. Peptidomics has thus emerged as a crucial bridge linking protein expression to functional regulation. What Is Peptidomics? Peptidomics is the systematic investigation of naturally .......

• • How to Perform High-Throughput Peptidomic Analysis with LC-MS/MS?

  Peptidomics is a scientific discipline focused on the study of endogenous peptides (typically <10 kDa) present in biological specimens. These peptides play critical roles in diverse physiological processes, including neurotransmission, immune response, hormonal signaling, and metabolic regulation, and hold substantial potential as functional molecules and biomarkers. Compared with proteomics, peptidomics provides a closer reflection of the actual states of protein cleavage, processing, and .......

• • How to Identify Active Enzyme Targets Using ABPP Technology?

  Activity-Based Protein Profiling (ABPP) is a proteomic technique that enables the analysis of proteins based on their active sites. By covalently labeling functionally active proteins with specific small-molecule probes, ABPP allows for the efficient and accurate identification of catalytically active enzymes, providing a transformative tool for target discovery and elucidation of drug mechanisms. Fundamental Principles of ABPP Technology for Active Enzyme Targets Identification 1. Definition of Active.....

• • How to Choose the Right Peptide Sequencing Method? Edman Degradation vs. Mass Spectrometry

  Peptide sequencing is an essential approach for elucidating the primary structure of proteins, and it has been widely applied in protein identification, validation of novel sequences, localization of modification sites, and antibody development. Currently, Edman degradation and mass spectrometry (MS) represent the two mainstream peptide sequencing methods, each offering distinct advantages tailored to different experimental requirements. This article provides a systematic comparison of these methods in.....

• • How to Simultaneously Determine Protein Purity and Concentration?

  In life sciences research and biopharmaceutical manufacturing, protein purity and concentration are essential parameters for assessing sample quality and process stability. Protein concentration reflects the absolute amount of the target protein in a sample, whereas purity denotes the proportion of the target protein relative to impurities. Conventionally, these two indicators are determined using distinct analytical methods, which not only increase procedural complexity but also heighten the risk of ......