Ac-Cys(farnesyl)-OH is an N-acetylated cysteine derivative bearing a farnesyl thioether side chain, featuring a substituted thiol-derived group on the cysteine sulfur alongside a free carboxylic acid and an N-acetylated amino functionality. The molecule contains an acetyl-protected α-amino group (as an amide) that reduces nucleophilicity at nitrogen while the farnesyl substituent increases hydrophobic character and provides a bulky isoprenoid appendage for chemical conjugation or membrane-association studies. Ac-Cys(farnesyl)-OH is used as a defined amino acid building block or intermediate for preparing thioether-containing peptide or protein conjugates, for structure-activity studies involving cysteine lipidation mimics, and for analytical method development where a controlled farnesylated cysteine motif is required.
Ac-Cys(farnesyl)-OH is a thioether-containing cysteine derivative bearing an S-farnesyl side chain, presented as an acetylated (N-acetyl) amino acid with a free carboxylic acid. The farnesyl group provides a hydrophobic isoprenoid handle that is widely used to model lipidated cysteine motifs in chemical biology and peptide-based studies, while the N-acetylation helps control backbone reactivity during downstream coupling or analytical handling. This building block is commonly selected when researchers need a defined, site-specific lipid-like modification on a cysteine residue for structure-activity relationship work, membrane association studies, or bioconjugation workflows that require a stable thioether-linked hydrophobic tag.
1. Lipidated Peptide Building Block
Ac-Cys(farnesyl)-OH is used as a defined cysteine building block for constructing lipid-mimetic peptides and peptide conjugates where an S-farnesylated side chain is required at a specific position. Researchers in chemical biology and peptide chemistry employ it to generate short sequence probes, scaffold peptides, and segment libraries that mimic prenylated cysteine motifs, enabling controlled evaluation of how hydrophobic farnesyl substitution influences conformation, aggregation propensity, and membrane-proximal behavior in model systems. The N-acetyl and free carboxyl functionality support straightforward incorporation into peptide assembly or coupling strategies used in custom peptide synthesis and analytical probe preparation.
2. Bioconjugation And Surface Immobilization
Ac-Cys(farnesyl)-OH is frequently selected for bioconjugation and material functionalization workflows that rely on hydrophobic lipid-like tags to drive association with hydrophobic surfaces, polymer matrices, or lipid-containing environments. Chemical biology groups use the farnesyl thioether motif as a stable, non-labile hydrophobic anchor when designing conjugates intended for surface immobilization, coating of biomaterials, or preparation of affinity reagents. Because the farnesyl group is directly attached to sulfur (thioether), the handle remains chemically robust under many routine conjugation and washing conditions, making the derivative useful for building reproducible lipid-mimetic constructs for downstream binding or localization experiments.
3. Structure-Activity And SAR Probes
Ac-Cys(farnesyl)-OH supports structure-activity relationship studies where lipidation state and hydrophobic side-chain identity must be controlled with high precision. Medicinal chemistry and chemical biology teams use this reagent to prepare matched analog series that vary the hydrophobic substituent while keeping the cysteine backbone context consistent, helping interpret how prenyl-like substitution affects physicochemical properties and interaction patterns in biochemical assays or binding surrogate systems. The defined acetylated amino terminus and the stable S-farnesyl linkage make it a practical choice for generating comparative probe sets used in screening campaigns, mechanistic studies, and assay development.
4. Analytical Standards For Lipid-Mimetic Motifs
Ac-Cys(farnesyl)-OH is used to prepare reference materials and calibration aids for analytical characterization of farnesylated cysteine-containing constructs, including peptide conjugates and lipid-mimetic intermediates. Analytical chemistry teams employ it as a defined standard to support method development and verification in LC-based workflows, peptide mapping, and characterization of hydrophobic modified species where consistent retention and mass behavior are important. The well-defined N-acetylated cysteine framework and the characteristic farnesyl thioether motif make this derivative useful for confirming identity, monitoring derivatization or coupling outcomes, and supporting quantitative comparisons across experimental batches.
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