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Protein Sequencing Service

The primary sequence of protein determines the advanced structure of a protein, influencing a protein's function. Therefore, the sequence of a protein is essential for understanding the biological function of the protein. KMD Bioscience has developed a comprehensive protein sequencing platform to meet the diverse needs of our customers, including N-terminal and de novo sequencing. Welcome to contact us for more information.


De Novo Sequencing Service:


Based on the advanced mass spectrometry instrument, 'Dao Jin' PPSQ-31A, and combined with rich experience in bioinformatics analysis, KMD Bioscience has established a complete new generation of de novo sequencing platform that can achieve accurate sequencing analysis of monoclonal antibodies and proteins. After the sample is received, our scientists will first identify and fragment it with six commonly used proteases: Trypsin, Chymotrypsin, Asp-N, Glu-C, Lys-C and Lys-C. KMD Bioscience is working to get the most fragmented sequences to achieve 99.99% protein coverage. The sequence information was spliced by PEAKs Studio and PEAKs Ab software and then artificially joined to perform nearly 99.99% correct protein or antibody primary sequence.


* For more de novo sequencing services, please browse the antibody de novo sequencing services or contact us for further information.


N-Terminal Sequencing Service (Edman Degradation):


KMD Bioscience can sequence up to 60 amino acid residues from the N-terminal. The Edman method for sequencing a single amino acid cycle consists of 3 steps.

Step 1: PITC binds to free amino acids at the N-terminal of the protein under alkaline conditions.

Step 2: N-terminal residues are removed in acidic solutions.

Step 3: PITC-bound residues are converted to more stable PTH residues. After on-line analysis by HPLC, amino acids were determined according to elution time.


Sequencing Procedure:


Protein samples are first separated by SDS-PAGE to ensure the purity can meet the requirements of sequencing. Subsequently, protein samples from SDS-PAGE are transferred to PVDF membranes and cut the gel band after dyeing. Then it is loaded directly on the sequencer.


Sample Requirement:


--Purity: >95% (Based on moles).

-- Sample amount: 50-100pmol (Liquid volume control at 20ul).

--Unblocked N-terminus.

--Sample format: Dry, solution, PVDF membranes.

--No interference: Protease, amino acid, amine, salt, acetaldehyde, detergent, etc.

* For specific sample requirements and examples, please click on the 'Edman Sequencing Sample Requirements' for more information.


Service Characteristics:


-- Identify recombinant protein expression and pulldown products.

-- Validation of expressed products in cell lines.

--Validation of N-terminal sequences of antibody biosimilar.


Service Highlights:


--Unparalleled protein sequencing accuracy.

--99.99% protein sequence coverage and confidence.

--Strict quality control system and strong analytical capabilities.


How to Order?

If you have any questions regarding our services or products, please feel free to contact us by E-mail: or Tel: +86-400-621-6806;