(S,R,S)-AHPC-PEG2-azide

Background Introduction

(S,R,S)-AHPC-PEG2-azide is a versatile E3 ligase ligand-linker conjugate widely utilized in PROTAC (Proteolysis Targeting Chimera) technologies. Built around the potent Von Hippel-Lindau (VHL) E3 ligase ligand (AHPC), this molecule features a flexible PEG2 spacer and a terminal azide group. These structural elements enable precise bioconjugation via click chemistry, making it an essential building block for the construction of next-generation PROTAC molecules and other heterobifunctional degraders.

Mechanism

The mechanism of (S,R,S)-AHPC-PEG2-azide centers on targeted protein degradation through the ubiquitin-proteasome system. The AHPC moiety binds selectively to the VHL E3 ubiquitin ligase complex. The PEG2 linker increases solubility and provides optimal spatial arrangement, minimizing steric hindrance. The azide group at the terminus allows for efficient click chemistry conjugation with alkyne-functionalized ligands. In PROTAC assembly, the resultant chimera connects a target protein ligand to the E3 ligase ligand, bringing the target in close proximity to the E3 ligase and promoting ubiquitination and subsequent proteasomal degradation of the target protein.

Applications

(S,R,S)-AHPC-PEG2-azide is a premier tool in the design of PROTACs aimed at targeted protein degradation. It is valuable in preclinical research for developing and optimizing novel PROTAC molecules targeting disease-relevant proteins in oncology, neurodegeneration, and immunology. The azide functionality facilitates rapid prototyping through bio-orthogonal click chemistry, accelerating SAR (structure-activity relationship) studies and enabling the creation of chemical probes, dual-targeting degraders, and other protein homeostasis modulators. This conjugate is also applicable in PROTAC library synthesis, facilitating high-throughput screening of degraders with diverse target profiles.

• Azide-functionalized PEG2 linker enables versatile click chemistry conjugation for efficient PROTAC assembly.
• Designed for VHL-based PROTAC synthesis, offering high selectivity and improved cellular permeability.

(S,R,S)-AHPC-PEG2-azide is a versatile E3 Ligase Ligand-Linker Conjugate employed in PROTACs to facilitate targeted protein degradation. It offers unique characteristics that enhance selectivity and efficacy in degrading disease-related proteins. The following provides a detailed description of this molecule, including its linker, ligand, and selection of target protein ligands.

Linker: The linker in (S,R,S)-AHPC-PEG2-azide is a PEG2 unit, which provides moderate length and flexibility, allowing optimal spatial arrangement between the ligand and the target protein. It is non-cleavable, ensuring stability and sustained activity during the degradation process.

Ligand: The ligand component is based on AHPC, a small-molecule ligand that specifically binds to cereblon, a well-characterized E3 ubiquitin ligase. Its stereochemical configuration (S,R,S) enhances binding affinity and specificity, crucial for effective protein targeting in PROTAC applications.

Reactive Site: The azide functional group serves as the reactive site, enabling the conjugation with alkyne-modified target protein ligands through a copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction. This site is ideal for bioorthogonal reactions, ensuring minimal interference with biological systems.

Recommended Target Protein Ligand: The recommended warhead for this molecule is an alkyne-functionalized ligand, which efficiently couples with the azide group via click chemistry. This approach is advantageous due to its high specificity and mild reaction conditions, making it suitable for targeting a wide range of proteins in experimental studies focused on elucidating protein function and degradation pathways.