Resources

Proteomics Databases



Metabolomics Databases

• • How to Enrich Low-Abundance Histone Succinylated Peptides?

  In recent years, advances in epigenetics and protein post-translational modification research have made histone modifications an important focus in life science research. In addition to classical acetylation, methylation, and phosphorylation, succinylation has attracted increasing attention as an emerging acylation modification because of its important roles in chromatin architecture and gene expression regulation. However, compared with more abundant modifications, succinylation is typically characte......

• • Big Data in Immunopeptidomics: From HLA Binding Prediction to Personalized Immune Mapping

  In the era of precision medicine, understanding what the immune system recognizes and how immune responses are initiated has become a central scientific question in immunotherapy and vaccine design. Immunopeptidomics represents a key analytical approach for addressing this question. It enables the direct capture and identification of peptides presented by HLA molecules using mass spectrometry, thereby delineating a map of immune recognition. In recent years, with advances in big data analytics and the......

• • Advantages and Disadvantages of Non-reduced Peptide Mapping in Disulfide Studies

  In modern proteomics and biopharmaceutical development, protein higher-order structure and disulfide bond connectivity are critical determinants of protein function and stability. Non-reducing peptide mapping is an analytical technique designed to preserve disulfide bond structures. It enables enzymatic digestion and mass spectrometry analysis without disrupting disulfide linkages, thereby directly revealing disulfide bond connectivity and peptide integrity within proteins. This method is widely used ......

• • What Are the Most Common Histone Ubiquitination Sites?

  Histones are core structural components of chromatin, and diverse covalent modifications of lysine residues within histones play critical regulatory roles in gene expression and chromatin dynamics. Histone ubiquitination is an important epigenetic modification in which ubiquitin, a small regulatory protein, is covalently attached to lysine residues in histones, thereby altering nucleosome structure and regulating gene activity. This modification not only plays a central role in transcriptional regulat......

• • Application of High-Resolution Mass Spectrometry in Molecular Weight Identification

  In proteomics and biopharmaceutical research and development, molecular weight determination is a fundamental yet critical analytical step. Accurate molecular weight measurement is essential for recombinant protein expression verification, monoclonal antibody quality control, and structural characterization of unknown proteins. Conventional methods such as SDS-PAGE can provide approximate molecular weight information; however, their limited resolution cannot fully meet the requirements of modern bioan......

• • How HPLC-MS/MS Enables Accurate Protein Disulfide Bond Localization Analysis?

  Disulfide bonds are critical structural elements that support the higher-order structure and function of proteins. Their formation and disruption play key roles in protein folding, structural stability, and functional regulation. Accurate identification of disulfide-bond positions in proteins is essential for understanding protein conformation, developing biopharmaceuticals, and investigating disease mechanisms. However, because disulfide bonds are embedded in complex protein matrices, their localizat......

• • What Drives Cost in a Peptide Mapping Service?

  Learn what drives peptide mapping service cost, including product complexity, digestion strategy, sample number, PTM scope, reporting depth, and rework risk for biologics projects.

• • Peptide Mapping Service or In-House Testing?

  Compare peptide mapping service with in-house LC-MS/MS or HPLC testing by documentation needs, internal capacity, reporting depth, and project phase for biologics characterization.

• • Before You Submit: Peptide Mapping Service Essentials

  Prepare your peptide mapping service submission with this pre-submission checklist covering reporting goals, reference sequence, sample purity, buffer review, and expected deliverables.

• • Peptide Mapping Service for Biologics Characterization

  Learn how peptide mapping service supports biologics characterization through LC-MS/MS sequence coverage, PTM localization, and comparability evidence for therapeutic proteins.