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Proteomics Databases



Metabolomics Databases

• • How to Perform Hybridoma Sequencing: Key Steps for Obtaining Antibody Variable Region Sequences

  Hybridoma sequencing is often requested when a monoclonal antibody is available from a hybridoma cell line, but the VH and VL sequences are missing from lab records. A culture may still produce antibody, binding assays may look acceptable, and frozen stocks may remain in storage, yet the variable-region sequences needed for recombinant expression, clone backup, or documentation were never archived.

• • Hybridoma Sequencing: Principles and Applications for Monoclonal Antibody Characterization

  Hybridoma sequencing addresses this gap by recovering antibody sequence information directly from hybridoma-derived nucleic acids. The method uses viable hybridoma cells or high-quality RNA as input, converts immunoglobulin transcripts to cDNA, amplifies variable regions by PCR, and assembles VH and VL sequences with CDR annotation.

• • Hybridoma Sequencing vs Protein-Level Antibody Sequencing: Choosing the Right Recovery Route

  The central decision is not which method is universally better. It is which method best matches the material available, the required level of evidence, and the downstream use of the recovered sequence. If your team is deciding between hybridoma cell sequencing and protein-level recovery, MtoZ Biolabs can Compare recovery routes before samples are prepared or submitted.

• • Ngs vs Sanger Sequencing: Method Selection and Research Use Cases

  A method-selection guide for researchers deciding between Sanger sequencing, NGS, and LC-MS/MS-based de novo peptide/protein sequencing.

• • Common Challenges and Strategies for Disulfide Bond Analysis

  Disulfide bonds are critical chemical linkages within the higher-order structure of proteins, playing essential roles in protein folding, stability, and function. With the rapid advancement of biopharmaceuticals and proteomics, precise characterization of disulfide bonds has become a pivotal step in high-quality protein structural analysis. Nevertheless, disulfide bond analysis in practical experiments faces several technical challenges. The following summarizes these challenges and corresponding stra......

• • 4D-DIA vs 4D-PRM: Which 4D Quantitative Approach Suits Your Project Better?

  In contemporary proteomics, Data-Independent Acquisition (DIA) and Parallel Reaction Monitoring (PRM) have emerged as two principal strategies for non-targeted and targeted protein quantification, respectively. With the integration of Ion Mobility technology, 4D proteomics on the timsTOF Pro platform incorporates the mobility dimension into the analytical framework, substantially enhancing both separation and quantification performance. Within this technological context, 4D-DIA and 4D-PRM have become ......

• • Complete CUT&Tag Data Analysis Pipeline: From Sequencing to Interpretation

  CUT&Tag (Cleavage Under Targets and Tagmentation) is widely used in chromatin modification and transcription factor binding studies due to its high sensitivity, low background, and operational simplicity. While experimental procedures constitute the first step, robust downstream data analysis is essential for elucidating chromatin regulatory mechanisms. This article presents a systematic overview of the CUT&Tag data analysis workflow, aimed at facilitating efficient data interpretation and the constru......

• • Applications of TMT-Based Quantitative Proteomics in Drug Development and Biomarker Discovery

  With the advancement of precision medicine and biopharmaceuticals, proteomics has emerged as a core technology in both drug development and disease biomarker research. Among the various quantitative strategies, multiplexed mass spectrometry using Tandem Mass Tag (TMT) labeling has been widely applied in drug target screening, mechanistic studies, and biomarker discovery due to its high throughput, low batch variation, and high quantitative accuracy. This article systematically reviews the application ......

• • Mass Spectrometry-Based Host Cell Protein Analysis: Principles, Workflow, and Benefits

  In the biopharmaceutical field, recombinant protein therapeutics, such as monoclonal antibodies and fusion proteins, expressed and purified in mammalian cells, for example CHO cells, often contain a significant impurity: host cell proteins (HCPs). If HCPs are not thoroughly removed during downstream purification, they can induce immunogenic responses, compromise drug stability, and even pose safety risks to patients. Consequently, accurate identification and quantification of HCPs is a critical step i......

• • LC-MS/MS Workflow for Disulfide Bond Mapping Analysis

  Disulfide bonds are critical covalent linkages that maintain the stability of protein tertiary and quaternary structures, playing essential roles in protein structural characterization and biopharmaceutical development. In particular, in antibody therapeutics, recombinant proteins, and complex biopharmaceutical formulations, correct disulfide bond pairing directly influences protein folding conformation, biological activity, and safety. Consequently, LC-MS/MS-based disulfide bond mapping has emerged a......