Mass Spectrometry Grade Enzymes for Proteomic Digestion and Sample Preparation

Mass spectrometry (MS) grade enzymes are ultra-pure proteases specifically engineered and rigorously standardized for protein sample preparation in mass spectrometry workflows. MS grade enzymes undergo extensive purification and chemical modifications, such as reductive methylation, to minimize digestion and eliminate contaminating proteolytic activities. This ensures high cleavage specificity and prevents the generation of unwanted background noise or artifact peaks during mass spectra analysis.

Trypsin is the most universally utilized MS grade enzyme, because of its highly specific and efficient cleavage at the carboxyl side of arginine and lysine residues. Other major types include alternative endoproteinases such as Lys-C, Glu-C, Asp-N, and Chymotrypsin, which provide different cleavage specificities and are often used sequentially or in combination with trypsin to maximize protein sequence coverage.

These high-fidelity enzymes are applied in modern proteomics, particularly in approaches where large proteins must be reliably digested into smaller, predictable peptide fragments prior to LC-MS/MS analysis. They are heavily relied upon for accurate protein identification, protein quantitation, and the comprehensive characterization of post-translational modifications (PTMs) such as phosphorylation, methylation, or glycosylation. Furthermore, in the biopharmaceutical industry, MS grade enzymes are crucial for peptide mapping and the structural validation of therapeutic proteins, ensuring reproducible, artifact-free data required for strict quality control. Amerigo Scientific offers a variety of MS grade enzymes to meet the application requirements of different fields.

Specific Proteolytic Enzymes

Specific proteolytic enzymes comprise highly specific endopeptidases that selectively cleave peptide bonds at either the C-terminus or N-terminus of targeted amino acid residues. These enzymes serve as the foundational tools for effectively digesting complex proteins into predictable peptide fragments that fall within the optimal mass range for mass spectrometry identification and sequencing.

By utilizing engineered variants, alternative cleavage sites (such as GluC, AspN, or Chymotrypsin), and "mirror" proteases (Trypsin-N and LysN), researchers can significantly improve sequence coverage, mitigate digestion gaps, and precisely map challenging PTMs.

Glycoproteomics and Glycan Analysis Enzymes

Glycoproteomics and glycan analysis enzymes are designed for the targeted analysis of protein glycosylation, focusing explicitly on the removal, modification, or site-specific cleavage of N-linked and O-linked glycans. This group includes robust glycosidases and glycoproteases that can either strip complex oligosaccharides cleanly from the protein backbone or selectively digest peptide bonds adjacent to glycosylation sites without structural bias.

Amerigo Scientific offers specific enzymes for high-throughput glycoproteomics, characterization of intact glycoprotein mass, and precise mapping of glycosylation sites, which are critical workflows in evaluating biopharmaceutical quality control and therapeutic efficacy.

Antibody Engineering and Conjugation Enzymes

This group consists of specialized tool enzymes for the structural characterization, site-specific labeling, and modification of therapeutic antibodies and fusion proteins. It features highly precise proteases capable of generating homogenous antibody fragments via single-site cleavage, as well as transferases and transpeptidases engineered for precise molecular conjugation and protein cyclization via click chemistry.

In addition, we offer specific proteases dedicated to the seamless removal of recombinant fusion tags (such as SUMO or DDDDK tags), ensuring that the final protein products retain their native, unmodified sequences.

Nucleic Acid Sample Pre-Treatment Enzymes

In upstream sample preparation, the elimination of nucleic acid contamination is essential, as it often interferes with downstream mass spectrometry workflows. Amerigo Scientific provides high-efficiency, recombinant endonucleases capable of digesting all forms of DNA and RNA into small, uniform oligonucleotide fragments. By rapidly reducing sample viscosity and eliminating background interference from nucleic acids, these enzymes significantly enhance overall protein recovery, improve sample purity, and ensure stable, reproducible mass spectrometry analysis for complex biological matrices.