Disulfide-Bonded Peptide Mapping Service
- Utilizes Orbitrap Fusion Lumos and Q Exactive HF mass spectrometers for high-resolution detection.
- Performs parallel experiments under both reducing and non-reducing conditions to ensure structural accuracy.
- Employs proprietary data analysis workflows to automatically identify cross-linked peptide pairs and verify disulfide linkage sites.
- Raw data files from LC-MS/MS platforms.
- Processed peptide mapping tables (Excel or CSV format) showing identified and linked peptide pairs.
- Summary report in PDF format including experimental methods, quality control metrics, and analytical conclusions.
- High-resolution spectra and peptide mapping figures in image formats such as TIFF or PNG.
- Monoclonal antibodies and recombinant proteins.
- Fusion proteins, enzymes, and biopharmaceutical products.
- Purified natural proteins and synthetic peptides containing cysteine residues.
MtoZ Biolabs provides disulfide-bonded peptide mapping service through a high-resolution liquid chromatography-mass spectrometry (LC-MS/MS) platform combined with professional enzymatic digestion and data analysis strategies. This service helps researchers accurately characterize intra- and intermolecular disulfide bond linkages, verify protein structural integrity, and provide reliable data for biopharmaceutical quality control and structural characterization. It is suitable for complex samples such as recombinant proteins, antibodies, and fusion proteins, ensuring clients obtain highly accurate structural information for drug development and protein engineering research.
Principle of Disulfide-Bonded Peptide Mapping
The principle of disulfide-bonded peptide mapping is to compare peptides obtained under reduced and non-reduced conditions using specific enzymatic digestion and mass spectrometric analysis to determine disulfide bond connectivity.
🔹 Under reducing conditions, disulfide bonds are cleaved to obtain individual peptides.
🔹 Under non-reducing conditions, disulfide bonds remain intact, and mass spectrometry detects characteristic peaks of cross-linked peptides.
🔹 By comparing mass spectrometry data and matching peptide sequences, disulfide bond pairs and linkage positions are determined.
This method offers high sensitivity and specificity, capable of identifying multiple disulfide linkage patterns in complex samples. It is commonly used for protein higher-order structure verification and quality consistency evaluation.
Disulfide-Bonded Peptide Mapping at MtoZ Biolabs
MtoZ Biolabs combines multiple proteases such as Trypsin, Chymotrypsin, and Glu-C with high-resolution LC-MS/MS systems to generate precise disulfide-bonded peptide maps.
Our service demonstrates high reliability and reproducibility in antibody structural analysis, fusion protein validation, and quality control.
Workflow of Disulfide-Bonded Peptide Mapping
Why Choose MtoZ Biolabs
☑️ Multi-platform mass spectrometry systems equipped with Thermo Orbitrap and Q Exactive HF instruments ensure high sensitivity and resolution.
☑️ Experienced team with extensive expertise in protein structural characterization and disulfide bond analysis.
☑️ Rigorous data quality control following international standards ensures accuracy and reproducibility.
☑️ Customizable analytical options tailored to specific protein or process requirements.
Applications of Disulfide-Bonded Peptide Mapping
1️⃣ Protein structure confirmation: validate correct folding and disulfide pairing in recombinant proteins or antibodies.
2️⃣ Biopharmaceutical quality control: assess process consistency, stability, and purity.
3️⃣ Structural modification research: evaluate the impact of mutations or modifications on disulfide bond formation.
4️⃣ Biosimilar analysis: compare structural consistency between reference and biosimilar products.
Deliverables
1. Complete experimental documentation and MS parameter records.
2. Raw LC-MS/MS data for reduced and non-reduced samples.
3. Confirmed disulfide bond linkage tables.
4. Protein structure diagrams and disulfide bond network visualization.
5. Comprehensive analytical report in PDF format with all associated raw data files.
FAQs
Q1: What is the service's general workflow?
Q2: What data formats are provided?
MtoZ Biolabs provides results in multiple standard formats to ensure compatibility with data processing and visualization software. Deliverables typically include:
Additional file formats or customized data outputs can be provided upon request to meet specific project or publication requirements.
Q3: What types of samples are suitable?
The service is compatible with various protein-based samples, including:
Samples should be of high purity and free from surfactants or high-salt buffers that may interfere with digestion or ionization efficiency.
Q4: How should I prepare my samples?
To ensure accurate and reproducible disulfide mapping results, MtoZ Biolabs recommends the following preparation guidelines:
1. Sample Purity: Provide purified protein samples (≥90% purity) without high concentrations of salts, detergents, or glycerol.
2. Sample Amount: At least 100 µg of protein or peptide sample is required. Additional material may be needed for replicate analyses.
3. Buffer Conditions: Use neutral buffers (pH 6.5–8.0) and avoid reducing agents such as DTT or β-mercaptoethanol.
4. Storage and Shipping: Store samples at −80°C and ship on dry ice in sealed, leak-proof containers to maintain sample stability.
5. Documentation: Include detailed information on protein source, buffer composition, and specific analysis objectives.
For more information, please refer to Sample Submission Guidelines for Proteomics and Sample Submission Guidelines for Metabolomics.
If you are unsure about your sample preparation, our technical team can provide personalized pre-analysis consultation and a sample submission guide to help you optimize preparation and shipping conditions.
Start Your Project with MtoZ Biolabs
Contact us to obtain a customized solution. Our technical team will design personalized analytical strategies and provide expert support tailored to your research needs.
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