Monday, July 28, 2014

Peptoid Arrays and Libraries

Designed for Detecting Bio-markers and Small-molecule Ligands
We have been successfully partnering with RayBiotech in providing Medical Testing and Research Lab ELISA Kits and Antibody Arrays. These have proven a cost effective way to detect from one to hundreds of proteins in a single sample. For example we tested 10 ASD Children using a Quantibody Arrays and here's a link to the results: Autism Spectrum Disorder (ASD) Children and Immune/Inflammatory Response Markers.

I am pleased to announce the addition of Peptoid Arrays.

Image: Peptoid Array-How They Work for Novel Ligands and Autoantibodies

The RayBio® Peptoid Array consists of thousands of unique peptoid sequences spotted on a glass slide support. The peptoid array combines the diversity of the bead-based peptoid library with the simplicity and rapid processing of the glass chip array. In this format, 2000+ peptoids can be quickly screened for binding activity to biological targets of interest.

Inage: Peptoid Anchored to Glass Slide


The Promise of Peptides as Drug Candidates

For nearly 20 years, peptides have been considered a promising class of drugs that possess distinct advantages over small molecule and biologic drugs. Compared to small molecule drugs, peptides can exhibit better efficacy, higher specificity, and lower toxicity. Compared to protein-based biologic pharmaceuticals, peptides are relatively inexpensive to produce and can easily be synthesized to exacting standards of purity and reproducibility between batches. Moreover, their chemistry and small size allows peptides to assume conformations that can mimic portions of full-length proteins or small molecules.

Advantages of Peptoids vs. Peptides

In practice, most peptide drug candidates have not lived up to the promise. Their susceptiblity to proteolytic cleavage, relatively short half-life in the body, and low oral and tissue bioavailability, make peptides less-than-ideal drug candidates. These challenges have hampered the translation of peptide drug candidates into therapeutics.
To overcome these inherent drawbacks, some researchers have investigated the potential for using peptide mimetics instead.  Some of the most promising peptidomimetic compounds are peptoids.
Peptoids are polymers of N-substituted amino acids that mimic many of the properties of peptides, but with distinct advantages. Peptoids have longer half-lives due to their  resistance to proteolysis; they also permeate cell membranes much better than peptides, resulting in greater bioavailability. Peptoids also have a much greater conformational freedom compared to a peptide of similar length, allowing a greater number of possible conformations, which can enhance sensitivity. Questions? Do not hesitate to contact me at or 612-801-1007.

1 comment:

creative peptides said...

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). Peptoid Synthesis