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K12 peptide is a defined short oligolysine composed entirely of L-lysine residues. As a highly cationic homopeptide, it is useful as a research reagent in studies involving electrostatic surface binding, cell and tissue attachment, nucleic acid interaction, and the development of peptide-assisted delivery systems.
Unlike high-molecular-weight poly-L-lysine polymers, a short oligolysine such as K12 offers a more chemically defined format for assay development and formulation screening. The dense positive charge contributed by lysine side chains allows the peptide to associate with negatively charged cellular membranes, glass or polymer-coated surfaces, and nucleic acids under appropriate conditions.
Published Research Background
Poly-L-lysine and oligolysine materials have been widely used for decades to improve cell attachment on glass and plastic substrates, particularly in microscopy, cell culture, and tissue handling workflows. Classical studies showed that polylysine-coated surfaces promote rapid adhesion of many cell types through interaction between negatively charged cell surfaces and an adsorbed polycationic layer. Poly-L-lysine-coated slides were later established for tissue-section and immunocytochemistry applications where improved sample retention is needed.
In parallel, oligolysine-based systems have become important tools in nucleic acid research because lysine-rich peptides can bind and condense DNA or RNA through charge-based interactions. Published delivery studies have shown that oligolysines and oligolysine-containing polymers can improve nucleic acid packaging and are useful components in nonviral gene delivery formulations.
Applications in Biomedical Research
Cell and Tissue Adhesion Studies
K12 can be used as a short cationic peptide for evaluating surface-mediated attachment of cells or biological samples. Lysine-rich coatings and related reagents are commonly applied in workflows where improved retention on cultureware, coverslips, or microscope slides is required.
- Cell adhesion screening
- Glass and plastic surface treatment studies
- Microscopy sample preparation
- Tissue and cytology slide attachment workflows
Surface Functionalization and Biomaterials Research
Because of its defined sequence and high positive charge density, K12 is useful in biomaterials and interface studies where electrostatic adsorption is desirable. Researchers can use short oligolysines as model surface-active peptides when evaluating coatings, immobilization methods, and charged interfaces.
- Surface modification research
- Biomaterial coating development
- Electrostatic adsorption studies
- Protein or particle immobilization workflows
Nucleic Acid Binding and Condensation
Lysine-rich peptides are widely used in DNA and RNA complexation studies. Short oligolysines provide a convenient model system for studying cationic peptide / nucleic acid interactions, condensation behavior, and formulation variables in delivery research.
- DNA binding studies
- RNA complexation experiments
- Nucleic acid condensation screening
- Formulation development for peptide-assisted delivery
Nonviral Delivery and Formulation Research
Oligolysine motifs have been incorporated into broader nonviral delivery platforms, including peptide-polymer and liposomal systems. K12 can serve as a simple lysine-rich building block for early-stage design work, control experiments, and structure-function comparison studies.
- Gene delivery research
- Peptide-polymer design studies
- Liposome or nanoparticle formulation screening
- Charge-density and sequence-length comparison studies
Why Researchers Use K12 Peptide
- Chemically defined short oligolysine sequence
- High cationic charge density for electrostatic interactions
- Useful for adhesion, coating, and nucleic acid studies
- Convenient model peptide for formulation screening
- Compatible with custom modifications and conjugation strategies
Research Use Statement
This product is intended for research use only. Not for human or therapeutic use.
Selected References
- Mazia D, Schatten G, Sale W. Adhesion of cells to surfaces coated with polylysine. Applications to electron microscopy.
- Huang WM, Gibson SJ, Facer P, Gu J, Polak JM. Improved section adhesion for immunocytochemistry using high molecular weight poly-L-lysine as a slide coating.
- Kwok A, Hart SL. Systematic comparisons of formulations of linear oligolysine peptides with siRNA and plasmid DNA.
- Johnson RN, Burke RS, Convertine AJ, et al. HPMA-oligolysine copolymers for gene delivery.
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