MtoZ Biolabs utilizes advanced instrumentation and analytical platforms to provide an edman-based N-terminal sequencing service enabling high-confidence, multi-round determination of the N-terminal amino acid order in proteins. This service is widely used for confirming the starting sequence of unknown proteins, supporting functional domain studies, and revealing sequence-level patterns relevant to biomarker research, providing reliable sequence evidence for structural and functional protein investigations.

What Is Edman Degradation?

Edman degradation is a chemical sequencing method based on the free N-terminus of proteins or peptides. It utilizes PITC to sequentially derivatize the N-terminal amino groups, followed by cyclic cleavage and reading of the derivatized products under mild conditions, thus restoring the true amino acid sequence of the protein's starting terminal. This method provides highly reliable N-terminal sequence evidence without relying on databases and is suitable for the verification of starting sequences and functional domain analysis of both natural and engineered proteins. It has broad application value in antibody engineering, recombinant protein development, and protein processing starting terminal confirmation research.

Ouellette, R J. et al. Organic Chemistry (Second Edition), 2018.

Figure 1. Edman Degradation.

Edman-Based N-Terminal Sequencing Service at MtoZ Biolabs

MtoZ Biolabs provides customers with accurate sequencing and analysis services for the N-terminal start sequence of proteins through Edman degradation technology.

• Protein free N-terminal starting sequence identification

• N-terminal truncation or starting variant determination

• Protein sequence verification and purity confirmation

• Multi-batch consistency assessment of N-terminal starting residues

Our analysis offers a clear and comprehensive view of authentic protein N-terminal starting sequences, enabling high-confidence characterization to support downstream studies in protein initiation and functional domain research.

Workflow of Edman-Based N-Terminal Sequencing Service

1. Sample Evaluation

Assess the clarity and purity of the protein solution to confirm the absence of precipitation and significant interference.

2. Purification and Digestion Pretreatment

Perform necessary purification or desalting to ensure the sample is stable and compatible with sequencing workflows.

3. Edman Cyclic Degradation

Conduct iterative cleavage from the free N-terminus of the protein with signal acquisition to establish the amino acid sequence order.

4. Signal Interpretation and Correction

Apply noise reduction and directional verification to ensure accurate and reliable residue ordering.

5. Result Output

Deliver the N-terminal sequence list alongside truncation or variant identification, and provide method parameters and analysis reports.

Why Choose MtoZ Biolabs?

• Clear Sequence Orientation: Reads N-terminal residues sequentially to directly confirm the N-terminal start sequence of the free protein.
• Interference Compatibility and Robustness: Better tolerance to high salt or structurally heterogeneous backgrounds, stable separation and readout.
• Mature and Reliable Workflow: Standardized Edman cycle correction system, low sequence interpretation standardization error.
• Adaptable to Small Sample Volumes: Low sample consumption, suitable for N-terminal sequencing of small protein systems.
• Flexible Customization Strategies: Supports optimization of cycle parameters based on protein type and N-terminal characteristics.

Applications of Edman-Based N-Terminal Sequencing Service

1. Engineered Protein Confirmation

Reading the N-terminal sequence of recombinant or fusion proteins can be used to confirm the identity of engineered sequences.

2. Biomarker Discovery

Used for the regularity inversion of N-terminal sequences of proteins in clinical body fluids, supporting the screening of candidate markers.

3. Immune Response Studies

Identifying the N-terminus of response proteins in inflammation or infection models can aid in the analysis of immune mechanisms.

4. Folded Protein Quality Assessment

Used for confirming the N-terminal sequence of proteins with well-defined structural backgrounds, supporting conformational stability analysis.

5. Signal Pathway Initiation Profiling

Reading the N-terminal sequences of key signaling proteins of receptors and kinases can help confirm the direction of signal cascade initiation.

Deliverables

• Comprehensive Experimental Details
• Materials, Instruments, and Methods
• Protein N-terminal Sequence Analysis Results
• Visualized Charts and Figures
• Raw Data Files
• Comprehensive Analysis Report

FAQ

Q1: What types of samples are suitable?

A1: Suitable samples are soluble, clear, and high-purity protein specimens. We accept a wide range of protein sources, including recombinant proteins, affinity- or size exclusion-purified protein components, high-purity protease-digested fragments, as well as enriched target proteins from biofluid (plasma/serum) and serum, cell, or tissue lysis systems. Samples should avoid interference from high salt, strong viscosity, or complex particulate matrix backgrounds.

Q2: What is the service general workflow?

A2:

Q3: What data formats are provided?

A3: MtoZ Biolabs provides multiple types of standardized output, including:

• Protein N-terminal sequencing results (XLSX/CSV/TXT)

• Visualization images (PNG/TIFF)

• Raw experimental data

• A comprehensive analysis report containing experimental parameters and final sequencing conclusions (PDF)

If special analytical requirements exist, data formats can be customized according to project specifications.

Q4: How should I prepare my samples?

A4: To ensure optimal identification results, it is recommended to prepare samples in the following aspects:

• Sample Purity: Ensure protein solutions are free of precipitation or turbidity. Minimize residues from salts, glycerol, excipients, and surface-active agent materials.
• Storage Conditions: 4℃ for short-term. -80℃ for long-term. Avoid repeated freeze-thaw cycles.
• Shipping Conditions: Seal samples to prevent leakage. Maintain cold-chain transport using ice packs or dry ice.
• Additional Information: Provide key supplementary information, including protein source, buffer composition, concentration estimates, and detergent or solvent system details to support calibration and optimize the sequence analysis workflow.

For more information, please refer to Sample Submission Guidelines for Proteomics, Sample Submission Guidelines for Metabolomics.

Start Your Project with MtoZ Biolabs    

Contact us to discuss your experimental design or request a quote. Whether you are exploring the N-terminal sequence features of unknown proteins or investigating molecular integrity patterns of antibodies or engineered proteins, we can provide you with high-confidence N-terminal sequencing verification support.