(S,R,S)-AHPC-PEG3-NH2 hydrochloride

Background Introduction

(S,R,S)-AHPC-PEG3-NH2 hydrochloride is a synthetic E3 ligase ligand-linker conjugate commonly utilized in the development of PROTACs (Proteolysis Targeting Chimeras). It features the well-characterized VHL ligand (AHPC) connected via a triethylene glycol (PEG3) linker, terminating in an amine group ideal for bioconjugation. This modular compound is instrumental for researchers designing highly specific molecular tools to induce targeted protein degradation, a fast-growing area in chemical biology and drug discovery.

Mechanism

The mechanism of (S,R,S)-AHPC-PEG3-NH2 hydrochloride centers on its function as a building block in PROTAC technology. The AHPC moiety selectively binds to the VHL (von Hippel-Lindau) E3 ligase. The PEG3 linker provides optimal flexibility and solubility, while the terminal amine (NH2) allows for easy conjugation to other ligands or small molecules that target the protein of interest. When incorporated into a PROTAC, this conjugate brings the E3 ligase into proximity with the target protein, facilitating its ubiquitination and subsequent degradation via the proteasome pathway.

Applications

(S,R,S)-AHPC-PEG3-NH2 hydrochloride is widely used in the synthesis of custom PROTAC molecules for both in vitro and in vivo studies. Its primary applications include drug discovery screening, target validation, and mechanistic studies of protein homeostasis. Researchers utilize this ligand-linker conjugate to generate bifunctional molecules capable of selective degradation of disease-relevant proteins, thus advancing the development of next-generation therapeutics, particularly in oncology, neurodegenerative disorders, and immunology.

• PEG3 linker provides enhanced water solubility and optimal spatial flexibility for efficient PROTAC design.
• Amine termination enables versatile conjugation for rapid synthesis of VHL-based PROTAC molecules.

The E3 Ligase Ligand-Linker Conjugate, (S,R,S)-AHPC-PEG3-NH2 hydrochloride, plays a crucial role in the development of PROTACs by facilitating targeted protein degradation. This compound is characterized by its efficient ligand-linker design, enhancing the specificity and efficacy of protein targeting. The following provides a detailed description of this molecule.

Linker: The linker in (S,R,S)-AHPC-PEG3-NH2 hydrochloride is a PEG3 (polyethylene glycol) chain, offering moderate length and flexibility. Its hydrophilic nature enhances solubility and bioavailability, while its non-cleavable structure ensures stability during proteolysis-targeting chimera formation.

Ligand: The ligand component is an AHPC moiety, structurally optimized for high-affinity binding to the VHL (von Hippel-Lindau) E3 ligase. This ligand is crucial for the selective recruitment of the E3 ligase, facilitating effective ubiquitination of the target protein.

Reactive Site: The reactive site of this molecule is the terminal amine group, which couples efficiently with target protein ligands through amide bond formation. Recommended reaction types include carbodiimide-mediated coupling or activated ester chemistry, ensuring robust and specific covalent attachment.

Recommended Target Protein Ligand: The recommended warhead for this conjugate is a small molecule inhibitor with a functional group amenable to amide bond formation, such as a carboxylic acid. This allows for precise targeting of proteins implicated in disease pathways, enabling the study of protein function and degradation in cellular environments. The versatility of this approach supports diverse applications in drug discovery and mechanistic studies.