Ac-Lys-NHMe

Ac-Lys-NHMe is an N-acetylated lysine amide (Lysine side chain with an N-acetylated amino terminus and a C-terminal N-methylamide), functioning as a short, protected lysine-containing peptide fragment. Its terminal amide and acetylated N-terminus make it a stable, non-zwitterionic building block for downstream coupling, while the lysine side-chain ε-amine provides a primary functional handle for further derivatization. This structure is commonly used in peptide chemistry and chemical biology workflows where a lysine residue in a defined local environment is required without introducing a reactive free α-amino group.

1. Lysine-Containing Peptide Fragments

Ac-Lys-NHMe is used to assemble lysine-bearing peptide segments in solution-phase peptide synthesis and in custom peptide intermediate preparation. Researchers rely on the acetylated N-terminus and the N-methylamide C-terminus to control reactivity during segment coupling, enabling selective modification of the ε-amine side chain when needed. This fragment format is particularly useful for generating defined lysine-containing oligopeptides, for preparing standards and reference compounds, and for building block screening in peptide chemistry programs where the lysine environment must be consistent across analogs.

2. ε-Amine Derivatization Building Block

Ac-Lys-NHMe serves as a lysine ε-amine substrate for side-chain functionalization reactions used in chemical biology and medicinal chemistry research. The protected termini reduce competing reactions at the α-amino and carboxamide positions, allowing the ε-amine to be targeted for installation of acyl groups, linkers, or other substituents that tune solubility, charge, or conjugation behavior in downstream constructs. This makes the compound a practical intermediate for preparing functionalized lysine residues used in peptide conjugates, SAR-focused analog series, and non-natural peptide scaffolds where controlled lysine modification is required.

3. Bioconjugation Linker Intermediate

Ac-Lys-NHMe is commonly employed as a defined lysine-containing intermediate for preparing bioconjugation reagents and conjugate building blocks. The ε-amine offers a straightforward site for attachment of conjugation handles, while the N-acetyl/N-methylamide capping helps maintain a defined peptide-like backbone during linker installation and purification. Teams developing peptide-polymer conjugates, peptide-ligand constructs, or lysine-functionalized materials often choose this type of fragment to ensure the conjugation chemistry proceeds from the lysine side chain rather than from terminal groups, improving reproducibility across batches and analogs.

4. Pharmaceutical Intermediate Development

Ac-Lys-NHMe is also used in pharmaceutical intermediate development as a lysine-containing, capped building block for preparing amide-linked intermediates and side-chain-modified fragments. Process and R&D chemists value the reduced ambiguity in terminal reactivity (acetylated N-terminus and N-methylamide) when designing downstream coupling sequences that incorporate a lysine-derived motif. This application is especially relevant for programs that require lysine side-chain functionalization while maintaining a stable peptide-like fragment for further transformation into larger synthetic targets or advanced intermediates.

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