N-α-Acetyl-L-lysine is an N-acetylated, naturally occurring amino acid derivative of L-lysine featuring a six-carbon aliphatic side chain terminating in a primary ε-amino group and a carboxyl group on the α-carbon. The α-amino functionality is converted to an acetamide (N-α-acetyl), leaving the ε-amino side chain as a free primary amine that can form salts or participate in amide/urea formation under appropriate conditions, while the molecule retains the L stereochemical designation at the α-center. As an amino acid derivative used in peptide chemistry and chemical biology, it functions as a substrate-like or blocking analogue in studies of lysine-specific reactivity, and it can serve as a defined building block for preparing more complex lysine-containing peptides and labeled or conjugated derivatives.
CAT No: CP01408
N-α-Acetyl-L-lysine is an L-lysine derivative in which the α-amino group is acetylated, yielding an N-acetylated amino acid with a free ε-amino side chain and a carboxylic acid group. The molecule retains the stereogenic center of L-lysine and presents two chemically distinct nitrogen sites: the amide-like N-acetyl moiety and the primary ε-amine, which can participate in selective derivatization and coupling chemistry. The presence of both a carboxylic acid and an unprotected side-chain amine makes it a practical intermediate for controlled peptide building-block preparation, while the N-acetyl group can influence reactivity by reducing α-amino nucleophilicity and improving compatibility with peptide coupling conditions. N-α-Acetyl-L-lysine therefore serves as a chiral amino acid intermediate for side-chain functionalization, protected-amino-acid strategies, and biochemical research workflows that require lysine topology with an α-amide-like handle.
1. Protected Amino Acids
N-α-Acetyl-L-lysine is used in protected amino acid synthesis planning where selective reactivity between the α-acetylated nitrogen and the ε-amino side chain is required. The N-acetyl group functions as an α-amino "masked" form, while the free ε-amine can be protected, acylated, or converted into orthogonally removable protecting groups to enable stepwise construction of peptide fragments. The carboxylic acid enables conversion to activated esters or coupling-ready derivatives, supporting peptide bond formation without reintroducing α-amino ambiguity. Downstream, N-α-Acetyl-L-lysine can be incorporated into workflows that generate N-protected lysine residues and stereochemically defined chiral intermediates for peptide building-block preparation and fine chemical synthesis.
2. Peptide Synthesis
N-α-Acetyl-L-lysine supports peptide synthesis strategies that require an N-acetylated lysine residue or a lysine side chain for controlled elongation and subsequent functionalization. The α-amide character of the acetylated nitrogen helps define the N-terminus chemistry of a lysine-containing fragment, while the ε-amine can be preserved for later coupling, selectively protected for orthogonal steps, or used for branching into side-chain-modified analogs. The free carboxylic acid and the stereodefined L-configuration allow conversion into peptide-coupling intermediates that maintain lysine geometry and side-chain positioning. Resulting derivatives can be applied to the preparation of peptide analogs, internal standards, and sequence-defined constructs used in biochemical research and synthetic methodology development.
3. Chemical Biology Labeling
N-α-Acetyl-L-lysine is suitable for chemical biology and biomolecule labeling approaches that exploit lysine's ε-amino nucleophilicity under controlled conditions. The acetylated α-nitrogen reduces competing α-amino reactivity, directing derivatization toward the ε-amine for conjugation handles such as acylation, alkylation, or linker installation. The carboxylic acid can be transformed into activated forms to generate amide or ester-linked probes, enabling incorporation into peptide-based tags, affinity reagents, or mapping reagents where lysine side-chain chemistry is central. Downstream, labeled lysine-containing intermediates can be used to build conjugation-ready fragments for molecular recognition studies, proteomics-adjacent workflows, and analytical research standards.
4. Side-Chain Functionalization
N-α-Acetyl-L-lysine is applied in amino acid derivatization and side-chain functionalization where the ε-amino group serves as the primary reactive site. The N-acetylated α-amino group provides a stable amide-like environment that can remain intact during side-chain transformations, supporting selective modification of the lysine side chain while maintaining the chiral amino acid scaffold. The resulting ε-functionalized derivatives can be used to generate peptidomimetic building blocks, charged or neutral analogs, and intermediates that feed into further peptide coupling or heteroatom-containing motif construction. Broadly, this chemistry enables downstream synthesis of functional amino acid derivatives used in synthetic organic chemistry, biochemical probe development, and process chemistry intermediate preparation.
5. Analytical Research Standards
N-α-Acetyl-L-lysine is used in analytical research for method development and reference material preparation involving lysine-containing amino acid derivatives. The defined stereochemistry and the presence of both an acetylated α-amide and a free ε-amine create characteristic chemical signatures that can support identification and quantitation in chromatographic and mass spectrometric workflows. Carboxylic acid functionality supports derivatization strategies that improve detectability or chromatographic behavior, while the acetylated α-nitrogen provides a consistent structural motif for reproducible analytical response. Downstream, N-α-Acetyl-L-lysine can be employed as a chiral analytical standard, calibration component, or precursor for generating labeled or derivatized analogs used in biochemical research intermediate characterization and quality control of peptide-related materials.
6. Pharmaceutical Intermediate Preparation
N-α-Acetyl-L-lysine is relevant to pharmaceutical intermediate preparation and specialty chemical production where lysine-derived building blocks with defined N-chemistry are required for downstream synthesis. The amino acid framework, consisting of a carboxylic acid and an ε-primary amine, supports conversion into coupling-ready intermediates and enables formation of amide-linked motifs common to peptide-like drug candidates and peptidomimetic scaffolds. The N-acetyl group can function as a controlled N-protection element during manufacturing route design, allowing selective transformations at the side-chain nitrogen while maintaining a predictable α-amide environment. Resulting derivatives can serve as chiral intermediates for fine chemical synthesis, enabling stepwise construction of lysine-containing fragments used in applied product development and industrial-scale amino acid chemistry.
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