Collagen-derived peptide DGEA

Also known as Asp-Gly-Glu-Ala

A collagen-derived tetrapeptide investigated in adhesion assays, with α2β1-related activity requiring model-specific verification.

Length: 4 amino acids
Half-life: Not well characterised
Mechanism: DGEA was identified as a collagen-derived sequence associated with interference in α2β1-dependent cell–collagen interactions. Direct receptor engagement and signalling are context-dependent, and DGEA should not be treated as equivalent to the established triple-helical collagen ligands of α2β1.
Studied in: Cell-attachment assays, collagen-competition experiments and DGEA-functionalised biomaterials are used to study matrix recognition and adhesion-associated cellular markers.

About Collagen-derived peptide DGEA

DGEA is the tetrapeptide aspartate–glycine–glutamate–alanine, identified from a sequence in type I collagen. Early peptide-mapping experiments linked it to inhibition of collagen-dependent cell interactions and proposed a role in α2β1 integrin recognition. Subsequent structural work on collagen receptors established the importance of triple-helical motifs such as GFOGER. This history makes DGEA useful as a research sequence, but does not establish universal or high-affinity α2β1 binding by the isolated tetrapeptide.

Biomaterials studies have incorporated DGEA into surfaces and hydrogels to investigate cell attachment and matrix-associated phenotypes, including markers measured in osteoblast and stromal-cell cultures. Results depend on coupling chemistry, ligand accessibility, substrate properties and the proteins present in the culture medium. Adsorbed extracellular matrix proteins can contribute to apparent adhesion effects. Receptor-blocking experiments, defined-media controls and direct binding assays help distinguish sequence-specific interactions from indirect changes to the experimental surface.

Laboratory notes

Document the attachment chemistry: conjugation through either acidic side chain changes the native DGEA motif and may affect assay interpretation.
Include substrate-only and scrambled-peptide controls, and assess serum-protein adsorption when comparing functionalised surfaces.
Check final assay pH after stock preparation and confirm peptide identity and purity by suitable analytical methods such as LC–MS.

Storage and reconstitution basics: storage guide.

Questions about Collagen-derived peptide DGEA

Is DGEA an established selective α2β1 agonist?

That description is too strong. Its historical association with α2β1-dependent adhesion does not demonstrate selective receptor activation in every cell model.

How does DGEA differ from GFOGER?

DGEA is a four-residue sequence studied in collagen-related adhesion experiments. GFOGER is a hydroxyproline-containing motif with structurally established integrin recognition when presented in a suitable triple helix.

Can increased attachment prove direct DGEA–integrin binding?

No. Attachment can reflect altered surface properties or adsorbed proteins. Direct binding measurements and receptor-specific perturbations are needed to support that conclusion.

Is Collagen-derived peptide DGEA for human use?

No. It is supplied strictly for in-vitro laboratory research and is not for human or animal consumption.

Related research peptides

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