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Choice of chemically diverse side chains
Cost-effective,fast turnaround time
Peptide drugs are a rapidly growing class of therapeutics. However, the peptide drug discovery has been hampered by its inherent characteristics: low stability due to susceptibility to enzymatic digestion, low target specificity because of high conformational flexibility, low hydrophobicity and the lack of specific transportation systems. In order to overcome these disadvantages of peptide, GenScript has developed an innovative Peptoid Synthesis (SC1559) service to meet the increasing needs in drug target discovery and lead structure discovery research.
Peptoids, or poly-N-substituted glycines, are a class of peptidomimetics whose side chains are appended to the nitrogen atom of the peptide backbone rather than to the α-carbons (as they are in amino acids). In native peptides, R group represents 20 different substitutions for specific amino acids, while in peptoids, the selection of R groups can be much wider and potentially unlimited.
Fig.1 Structural comparison between peptide and peptoid
The typical delivery package consists of lyophilized peptoids of required sequence, purity, quantity and associated QC reports. Every step of peptoid synthesis is subject to GenScript's stringent quality control.
The synthesis of a peptoid can be achieved through two methods: monomer and submonomer.
Monomer method: This method is very similar to solid phase synthesis of peptide with the exception that all the protected monomers for peptoid synthesis need to be synthesized first, where the synthesis of every Nα-protected monomer is tedious and time-consuming.
Submonomer method: This method eliminates the need of Nα-protected monomers. Each residue is installed in two steps: acylation followed by nucleophilic displacement. The submonomer approach allows the use of any commercially available or synthetically accessible amine that has great potential for combinatorial chemistry. In the acylation step a haloacetic acid, typically bromoacetic acid, is activated by diisopropylcarbodiimide reacting with the amine of the previous residue. In the displacement step (a classical SN2 reaction), an amine displaces the bromide to form an N-substituted glycine residue. This approach has greater advantages over the monomer approach and has been widely applied to peptoid library construction. We currently apply the Submonomer method for peptoid synthesis.
With proven technical capability and state-of-the-art in-house instruments and technologies, we have successfully synthesized many peptoids.
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