Peptide–Lipid and LNP-Related Conjugation

LifeTein supports peptide–lipid and LNP-related conjugation projects in which peptides are attached to lipids, PEG-lipids, or related delivery-facing scaffolds for nanoparticle formulation, targeting, uptake, or tracking studies. These projects often involve DSPE-PEG, cholesterol-PEG, DMG-PEG, clickable lipids, or related amphiphilic building blocks.

In many practical projects, the peptide is not being “encapsulated” by us into a finished LNP product. Instead, we usually support the upstream chemistry needed to generate a peptide-functionalized lipid or PEG-lipid building block that the customer can use in downstream nanoparticle formulation and evaluation.

Common Project Types

Peptide–PEG–lipid	Peptide linked to DSPE-PEG, DMG-PEG, cholesterol-PEG, or related PEG-lipid systems
Targeting peptides	Peptides designed to sit on the exterior of a nanoparticle-facing construct for receptor targeting or biodistribution studies
CPP or transport peptides	Peptide domains intended to enhance uptake or trafficking
Clickable lipids	Lipid constructs bearing azide, alkyne, DBCO, tetrazine, or related handles
Preferred routes	Maleimide–thiol PEG-lipid conjugation for many routine designs; click-compatible routes for orthogonal or multifunctional constructs

Why Peptides Are Used in LNP-Related Systems

• To provide targeting motifs on the particle-facing surface
• To introduce cell-penetrating or uptake-enhancing functionality
• To add imaging, screening, or receptor-binding features
• To create more specialized delivery architectures

Common Chemistry Routes

• Maleimide–thiol chemistry is often the most direct route for cysteine-containing peptides and maleimide-functional PEG-lipids such as DSPE-PEG-MAL.
• Click-compatible routes are useful when the construct also includes a secondary handle, a reporter, or another functional component.
• Larger PEG-lipid formats such as PEG2000 or PEG4000 are common in delivery-facing studies.

Representative Molecule Types

• DSPE-PEG-peptide constructs
• Cholesterol-PEG-peptide constructs
• DMG-PEG-peptide constructs
• Clickable lipid-peptide hybrids
• Peptide-bearing amphiphiles for nanoparticle formulation work

For more detail on PEG-facing chemistry, see Peptide PEGylation Service. For broader conjugation options, see Peptide conjugation by click chemistry and site-selective ligation.

Reference note: Published work has used peptide-modified lipid systems in LNP-related delivery studies, including cyclic peptide-lipid constructs synthesized with N-terminal lipid modification strategies.

What we usually deliver

In most cases, we provide the peptide-functionalized lipid or PEG-lipid building block rather than a finalized clinical-grade LNP formulation.

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