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Degrader Building Blocks for Targeted Protein Degradation

Inhibition of activity of functional proteins is the primary strategy used in the traditional development of small-molecule drugs. In contrast, targeted protein degradation is an alternative and growingly employed approach in drug discovery that aims at reducing overall levels of disease-relevant proteins [1]. While traditional small-molecule or antibody drugs may only allow access to ~20 % of the proteome, degradation techniques can open the door to the remaining 80 % [2].

Synthetic targeted protein degrader molecules (often referred to as proteolysis targeting chimeras (PROTACs) [3] tend to alter the ubiquitin-proteasome machinery to change the scenario of action of disease-causing proteins. These small bifunctional molecules bind to both the target and the ligase, causing their spatial proximity, ultimately leading to the target's ubiquitination and its degradation by inducing selective intracellular proteolysis.

Life Chemicals offers its PROTAC Building Blocks Library, composed of over 1,600 compounds distinctly similar to those known to target E3 ligases and linker-like molecules (PEGs, Alkyl-Chain, and Alkyl/ether).

The compound selection can be customized based on your requirements. Cherry-picking is available.

Please, contact us at orders@lifechemicals.com for any additional information and price quotations.

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Background information

PROTACs are designed with two active domains and a linker (Fig. 1):

  1. The primary ligand that binds to the protein of interest (POI) - drug target meant for degradation.
  2. The second ligand that binds to an E3 ubiquitin ligase.
  3. A crosslinker in the middle joins the two moieties.

Schematic representation of the full PROTAC Degrader

Figure 1. Schematic representation of the full PROTAC Degrader

The design of PROTACs can turn out to be far from trivial and straightforward since even slight alterations in any moiety can affect binding to the POI or E3 ligase or the formation of the ternary complex.

Moreover, their molecular weight (usually 800 Da or more) poses a challenge for structural optimization [4]. In addition, the associated degradable space is limited to proteins that can efficiently be liganded with small molecules, as PROTACs are required to bind both the target protein and the E3 ligase individually.

Compound selection

This Screening Library has been designed based on the structure and activity data for the known PROTACs and E3 ligase binders (a 2D fingerprints similarity search, Tanimoto index ≥ 0.85) and general structural properties of the known PROTAC crosslinkers (Fig. 2). In total, over 1,600 structurally diverse compounds were selected from the Life Chemicals HTS Compound Collection.

The second active PROTAC moiety, functional against a particular drug target of interest, can be found in the Life Chemicals Collection of Targeted and Focused Libraries.

Compound examples from the Life Chemicals Protein Degradation library.  

Figure 2. Compound examples from the Life Chemicals Protein Degradation library.
A. E3 ligase binders/analogs. B. Linkers. 

References

  1. Hanzl A, Winter GE. Targeted protein degradation: current and future challenges. Curr Opin Chem Biol. 2020;56:35-41.
  2. Neklesa, T. K.; Winkler, J. D.; Crews, C. M. Pharmacol. Ther. 2017, 174, 138.
  3. Naito M, Ohoka N, Shibata N, Tsukumo Y. Targeted Protein Degradation by Chimeric Small Molecules, PROTACs and SNIPERs. Front Chem. 2019;7:849.
  4. Edmondson SD, Yang B, Fallan C. Proteolysis targeting chimeras (PROTACs) in 'beyond rule-of-five' chemical space: Recent progress and future challenges. Bioorg Med Chem Lett. 2019;29(13):1555-1564.
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