Lysyllysyllysine provides a tricationic tripeptide featuring three lysine residues, generating high charge density and strong electrostatic behavior. Researchers investigate its interactions with nucleic acids, acidic proteins, and membranes. Its flexibility supports modeling of polycationic binding motifs. Applications include chromatin research, peptide-polymer assemblies, and charge-driven interaction analysis.
CAT No: R2366
CAS No:13184-14-0
Synonyms/Alias:Lysyllysyllysine;Lys-Lys-Lys;13184-14-0;Trilysine;l-lysyl-l-lysyl-l-lysine;L-Lysine, L-lysyl-L-lysyl-;H-Lys-Lys-Lys-OH Acetate Salt;lysyl-lysyl-lysine;UNII-Y7F82M80K8;25988-63-0;Y7F82M80K8;(2S)-6-amino-2-[[(2S)-6-amino-2-[[(2S)-2,6-diaminohexanoyl]amino]hexanoyl]amino]hexanoic acid;(S)-6-Amino-2-((S)-6-amino-2-((S)-2,6-diaminohexanamido)hexanamido)hexanoic acid;Lysyllysyllysine?;2olb;POLYLYSINE HBR;L-Lysine,L-lysyl-L-lysyl-;SCHEMBL3796535;L-Lys-(L-Lys)n-L-Lys.xHBr;CHEMBL1229077;DTXSID40948891;CHEBI:160118;WBSCNDJQPKSPII-KKUMJFAQSA-N;AKOS027320373;CS-W009720;FP57749;HY-W009004;FP166353;FP177958;PD167574;NS00126231;G77532;Poly-L-lysine hydrobromide - M.W:1000-5000;Poly-L-lysine hydrobromide - M.W:4000-20000;Poly-L-lysine hydrobromide - M.W:70000-150000;Q27294355;(S)-6-Amino-2-((S)-6-amino-2-((S)-2,6-diaminohexanamido)hexanamido)hexanoicacid;N~2~-{6-Amino-2-[(2,6-diamino-1-hydroxyhexylidene)amino]-1-hydroxyhexylidene}lysine;
Lysyllysyllysine, also known as tri-lysine or KKK, is a synthetic tripeptide composed of three lysine residues linked in sequence. Characterized by its high positive charge and remarkable solubility in aqueous environments, this compound is valued for its unique physicochemical properties that make it highly versatile in biochemical research and industrial applications. Its structure, featuring multiple primary amine groups, enables strong interactions with negatively charged molecules and surfaces, facilitating a range of experimental manipulations in molecular biology, analytical chemistry, and materials science. The ability of tri-lysine to mimic certain naturally occurring polylysine motifs also makes it a useful tool for probing protein interactions and cellular processes.
Peptide synthesis research: In the field of peptide synthesis, lysyllysyllysine serves as a crucial building block and model compound for studying the assembly and folding of polybasic peptides. Its repetitive lysine motif provides insight into the behavior of cationic sequences during solid-phase peptide synthesis and purification, allowing researchers to optimize reaction conditions for challenging basic-rich peptides. The tripeptide is also employed in developing new coupling reagents and protecting group strategies, as its structure presents multiple reactive sites for chemical modification and analysis.
Surface modification and biomaterials: The strong cationic nature of tri-lysine enables its use in surface modification protocols, where it acts as a linker or coating to enhance the adhesion of biomolecules to a variety of substrates. By adsorbing onto negatively charged surfaces such as glass, silica, or certain polymers, it creates a favorable environment for subsequent immobilization of DNA, proteins, or cells. This application is particularly valuable in the fabrication of biosensors, microarrays, and tissue engineering scaffolds, where controlled surface chemistry is essential for reproducibility and performance.
Gene delivery and nucleic acid binding: Tri-lysine's capacity to bind nucleic acids through electrostatic interactions underpins its utility in gene delivery research. It is frequently explored as a component of non-viral transfection systems, where it condenses DNA or RNA into compact complexes that facilitate cellular uptake. The peptide's simplicity and tunable properties allow for systematic studies of structure-activity relationships, aiding the design of more efficient and less toxic gene carriers. Furthermore, its nucleic acid binding ability is exploited in the development of affinity purification protocols and analytical assays.
Protein-protein interaction studies: As a model of polybasic motifs found in various proteins, lysyllysyllysine is employed in investigations of protein-protein and protein-ligand interactions. It can serve as a competitive inhibitor or probe for binding sites that recognize lysine-rich sequences, enabling the elucidation of mechanisms underlying molecular recognition and signaling. The tripeptide is also used in affinity chromatography to purify proteins or antibodies that interact with lysine clusters, streamlining the study of post-translational modifications such as ubiquitination and SUMOylation.
Antifouling and antimicrobial coatings: The incorporation of tri-lysine into surface coatings offers a strategy for reducing biofouling and microbial colonization on medical devices, water treatment membranes, and other critical surfaces. Its high density of positive charges disrupts microbial cell membranes and inhibits the attachment of proteins and microorganisms, thereby enhancing the longevity and safety of coated materials. Research into the synergistic effects of tri-lysine with other antimicrobial agents continues to expand its potential in creating advanced functional surfaces.
Overall, lysyllysyllysine stands out as a multifunctional tool in peptide science, materials engineering, and molecular biology. Its applications range from facilitating peptide synthesis and modifying surfaces to advancing gene delivery systems, dissecting protein interactions, and developing antifouling technologies. Ongoing research into the properties and interactions of this tripeptide promises to unlock further innovations in both fundamental science and applied biotechnology.
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