Fmoc-Val-Cit-PAB-PNP is a peptide prodrug linker, is a linker for antibody-drug-conjugation (ADC).
Fmoc-Val-Cit-PAB-PNP is a synthetic peptide-based linker reagent widely utilized in the field of bioconjugation and targeted drug delivery research. Structurally, it comprises an Fmoc-protected valine-citrulline dipeptide sequence connected via a para-aminobenzyl (PAB) self-immolative spacer to a p-nitrophenyl (PNP) carbonate leaving group. This modular design enables selective and efficient conjugation to a variety of biomolecules, making the compound especially relevant in the development of antibody-drug conjugates (ADCs) and other targeted delivery systems. Its unique combination of peptide recognition sequence and cleavable linker chemistry provides researchers with a versatile tool for constructing sophisticated molecular architectures in preclinical research.
Antibody-drug conjugate (ADC) linker synthesis: Fmoc-Val-Cit-PAB-PNP plays a pivotal role in the assembly of next-generation ADCs by serving as a cleavable linker between cytotoxic payloads and monoclonal antibodies. The valine-citrulline dipeptide segment is specifically designed to be recognized and cleaved by cathepsin B and related lysosomal proteases, which are often upregulated in the tumor microenvironment. This enzymatic sensitivity enables site-specific release of the payload within targeted cells, enhancing the selectivity and efficacy of experimental ADC constructs during in vitro and in vivo validation studies.
Bioconjugation research: The compound's PNP carbonate functional group provides a highly reactive site for nucleophilic substitution, facilitating efficient attachment of small molecules, peptides, or proteins to the PAB-linked peptide scaffold. This feature allows researchers to generate a wide variety of bioconjugates with defined release profiles, supporting the investigation of linker stability, drug release kinetics, and payload optimization strategies in the context of targeted delivery platforms.
Self-immolative linker mechanism studies: The para-aminobenzyl (PAB) spacer incorporated into the molecule functions as a self-immolative unit, undergoing rapid fragmentation upon enzymatic cleavage of the peptide sequence. This property makes the reagent an important model for studying self-immolative linker systems, enabling detailed exploration of cleavage-triggered payload release mechanisms and the development of new linker designs for controlled drug activation in biochemical research.
Peptide synthesis and modification: The Fmoc-protected N-terminus of the molecule allows for seamless integration into solid-phase peptide synthesis (SPPS) workflows. Researchers can incorporate the Val-Cit-PAB linker into custom peptide chains or modify existing peptides with the cleavable motif, enabling the generation of tailored peptide conjugates for mechanistic studies or functional screening assays. The compatibility with standard Fmoc chemistry expands its utility in advanced peptide engineering and modification projects.
Targeted delivery system development: Beyond ADCs, the modular structure and enzymatic responsiveness of the Val-Cit-PAB motif make it a valuable component in the design of experimental targeted delivery vehicles, such as peptide-drug conjugates and nanoparticle-based systems. Its ability to facilitate controlled release of active agents in response to specific enzymatic triggers supports the creation of innovative delivery platforms for probing cellular uptake, intracellular trafficking, and site-selective activation of research compounds in model systems.
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