(S,R,S)-AHPC-C8-NH2

Background Introduction

(S,R,S)-AHPC-C8-NH2 is an advanced E3 ligase ligand-linker conjugate featuring the VHL (von Hippel-Lindau) ligand AHPC attached to an 8-carbon alkyl linker with a terminal amine group. This intermediate is a crucial building block in the synthesis of Proteolysis Targeting Chimeras (PROTACs), which are bifunctional molecules engineered to harness the cellular ubiquitin-proteasome system for targeted protein degradation. The modular design and synthetic accessibility of (S,R,S)-AHPC-C8-NH2 make it highly valuable for the rapid development of PROTAC libraries to address undruggable targets in drug discovery.

Mechanism

The (S,R,S)-AHPC-C8-NH2 functions by recruiting the Von Hippel-Lindau (VHL) E3 ubiquitin ligase to the proximity of a specific target protein through its conjugation with a suitable ligand. Upon hybridization with a target protein binder via the terminal amine, the final PROTAC molecule induces the formation of a ternary complex involving the E3 ligase, the target protein, and the PROTAC. This assembly facilitates the ubiquitination of the target protein, marking it for rapid degradation by the 26S proteasome. The C8 alkyl linker provides spatial flexibility and optimal orientation for efficient ternary complex formation and subsequent ubiquitination events.

Applications

(S,R,S)-AHPC-C8-NH2 serves as a versatile scaffold for developing VHL-based PROTACs aimed at selective protein degradation. Its terminal amine provides a convenient synthetic handle for coupling with a diverse range of target-binding ligands, enabling the generation of custom PROTACs for research and drug discovery. Key applications include: constructing screening libraries for high-throughput identification of degrader molecules; developing chemical probes for validating protein function; and generating lead compounds for therapeutic programs targeting oncogenic, neurodegenerative, or other disease-associated proteins. Additionally, (S,R,S)-AHPC-C8-NH2 is compatible with various conjugation chemistries, allowing researchers to streamline the production of next-generation PROTACs with enhanced selectivity and bioactivity.

The E3 Ligase Ligand-Linker Conjugate, (S,R,S)-AHPC-C8-NH2, plays a crucial role in PROTACs by facilitating targeted protein degradation. This molecule combines a specific ligand, linker, and reactive site to enhance selectivity and efficacy in degrading unwanted proteins, thereby offering significant advantages in research applications. The following provides a detailed description of this molecule.

Linker: The linker in (S,R,S)-AHPC-C8-NH2 is characterized by its medium length, consisting of an eight-carbon alkyl chain. It provides optimal flexibility, allowing for effective spatial orientation between the ligand and target protein. This linker is non-cleavable, ensuring stability during the degradation process.

Ligand: The ligand component of this molecule is derived from AHPC, a known E3 ligase binder. Its stereochemistry, specified as (S,R,S), enhances binding affinity and selectivity towards the target E3 ligase, ensuring efficient recruitment and degradation of the target protein.

Reactive Site: The reactive site features an amine group (NH2) at the terminus of the linker, which is designed for coupling with the target protein ligand. Recommended reaction types include amide bond formation and reductive amination, providing robust and stable conjugation for effective protein degradation.

Recommended Target Protein Ligand: Compatible warheads for (S,R,S)-AHPC-C8-NH2 include electrophilic groups such as acrylamides or chloroacetamides. These warheads are advantageous due to their ability to form covalent bonds with cysteine residues on target proteins, enabling precise and irreversible degradation. This facilitates diverse applications in studying protein function and validating therapeutic targets in cellular environments.