mPEG5-thiol is a methoxy-terminated polyethylene glycol (PEG) thioether/thiol-functional linker featuring a short PEG chain that provides a hydrophilic, stealth-like spacer while presenting a terminal thiol handle for chemoselective conjugation. In PROTAC and targeted protein degradation workflows, such PEG-thiol reagents are commonly used to introduce a flexible, water-soluble tether between a ligand-bearing fragment and a reactive electrophile or to enable controlled attachment to maleimide-, haloacetamide-, or other thiol-reactive groups via thiol chemistry. The PEG segment helps modulate solubility, reduce non-specific aggregation, and can tune the effective distance and orientation between the recruiting moiety and the target-binding ligand, which is critical for productive ternary complex formation. For researchers, mPEG5-thiol is valuable as a modular linker component to improve handling and conjugation efficiency when constructing degraders or related bifunctional chemical probes.
Structure of 524030-00-0
* For research and manufacturing use only. Not for human or clinical use.
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mPEG5-thiol is a methoxy-poly(ethylene glycol) thiol linker designed to introduce a stable, hydrophilic PEG segment while providing a terminal thiol handle for conjugation in targeted protein degradation workflows. Its flexible ether-rich backbone can improve solubility and reduce non-specific interactions, supporting efficient assembly of PROTACs. The thiol functionality enables chemoselective coupling strategies to connect ligands and other fragments, and the subsequent points describe its structure and practical reactivity considerations in detail below.
Structure: mPEG5-thiol consists of a methoxy-terminated poly(ethylene glycol) chain bearing a terminal thiol group. The structure features repeating ether linkages along the PEG backbone and a reactive sulfur–hydrogen bond at the terminus, providing a flexible, water-compatible scaffold suitable for linker incorporation.
Reactivity: The terminal thiol can participate in thiol–electrophile conjugation reactions commonly used to assemble PROTAC building blocks, including maleimide or activated haloalkyl coupling under mild, nucleophile-compatible conditions. To preserve thiol reactivity, reactions are typically performed under inert atmosphere or with oxygen control and in solvents that dissolve both partners. Base and pH are chosen to balance thiol activation and avoid side reactions such as disulfide formation; reducing environments may be used when appropriate.
* Our calculator is based on the following equation:
Concentration (start) x Volume (start) = Concentration (final) x Volume (final)
It is commonly abbreviated as: C1V1 = C2V2
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