(H-Cys-4MbetaNA)2 is a cysteine-derived, bis-functional amino acid derivative in which two cysteine units are linked to a 4MβNA (4-methyl-β-naphthylamine) motif, forming a symmetrical dimeric structure with thiol-bearing side chains. The molecule contains free amino and carboxyl functional groups on the cysteine framework and retains sulfur in a thioether/thiol-reactive cysteine side-chain environment, while the aromatic 4MβNA substituents provide a distinct hydrophobic/aryl handle for conjugation and spectroscopic readouts. As a labeled or structurally modified cysteine analogue, it is used in chemical biology and analytical workflows where cysteine-like functionality and an aryl tag are combined to support peptide/bioconjugate construction, structure-activity studies, or detection-oriented assay development.
(H-Cys-4MbetaNA)2 is a cysteine-based, dimeric amino acid derivative designed for chemical biology and peptide/protein labeling workflows where thiol chemistry and controlled reactivity are required. The structure centers on cysteine units bearing a 4-methyl-β-naphthylamine (4MβNA) substituent, enabling downstream conjugation or tagging strategies that benefit from the aromatic handle and the presence of cysteine-derived functionality. As an amino acid derivative rather than a free proteinogenic amino acid, it is typically handled as a defined reagent for building labeled constructs, preparing analytical materials, or generating functionalized intermediates for research-grade assays.
1. Thiol-Directed Labeling Reagents
(H-Cys-4MbetaNA)2 is used as a cysteine-derivative labeling reagent in chemical biology workflows that require thiol-aware coupling chemistry to introduce a defined aromatic tag onto peptides, peptide fragments, or protein targets. Researchers commonly employ this type of reagent to generate labeled biomolecules for binding studies, reagent characterization, or to enable traceable readouts in downstream analytical methods. The dimeric format and cysteine-based functionality help provide a consistent, stoichiometrically defined labeling input compared with less-defined thiol-containing mixtures, while the 4MβNA aromatic substituent supports robust detection and tracking in labeling-focused experimental pipelines.
2. Peptide Tagging And Derivatization
(H-Cys-4MbetaNA)2 is applied in peptide synthesis and peptide derivatization programs where an amino acid-derived handle is needed to append a chromophoric/aromatic moiety to peptide scaffolds. In custom peptide manufacturing and research peptide development, this reagent can be incorporated into workflows that generate modified peptide standards, affinity reagents, or internal reference materials for method development. The cysteine-based units provide a practical entry point for post-synthetic functionalization, while the 4MβNA substituent supports downstream characterization of the modified peptide products by common UV/visible and chromatographic approaches used in peptide analytics.
3. Protein Modification For Assay Development
(H-Cys-4MbetaNA)2 is leveraged in protein modification efforts aimed at producing defined, labeled protein conjugates for assay development and analytical method benchmarking. Biochemistry and proteomics method developers often use cysteine-derivative reagents to control labeling degree and to attach a consistent reporter group to proteins under research conditions. The reagent's dimeric cysteine architecture supports reproducible reagent dosing in labeling experiments, and the 4MβNA substituent provides an aromatic signature that can be monitored during purification and analytical verification of the modified protein conjugates.
4. Analytical Standards And Quantification
(H-Cys-4MbetaNA)2 is used to prepare labeled standards and derivatized reference materials for analytical workflows that require a defined amino acid-derived tag. Analytical chemistry teams in metabolomics, peptide analytics, and chemical biology frequently prepare calibration or verification materials from well-characterized labeling reagents to improve run-to-run consistency when monitoring tagged species. The presence of the 4MβNA aromatic substituent supports straightforward detection in many routine analytical setups, while the cysteine-based derivative nature helps align the standard's chemical identity with the labeled targets generated in labeling experiments.
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