Drosocin

Also known as Dro

A 19-residue Drosophila glycopeptide studied for carbohydrate-dependent ribosome binding and bacterial translation termination.

Length: 19 amino acids
Half-life: Not well characterised
Mechanism: Drosocin binds the bacterial ribosomal exit tunnel and can stabilise a termination complex containing a release factor, thereby disrupting translation termination. Its O-linked carbohydrate contributes to target interactions and can strongly influence experimental activity.
Studied in: Drosophila infection models, bacterial translation-termination assays and ribosome structural studies investigate drosocin glycosylation, uptake and target recognition.

About Drosocin

Drosocin was isolated from immune-challenged Drosophila melanogaster and is a short, proline-rich component of the fly's inducible innate immune response. The mature peptide contains 19 amino acids and carries O-linked glycosylation at threonine 11. Native carbohydrate structures include an N-acetylgalactosamine-containing modification, with glycoform composition requiring explicit identification. Consequently, a synthetic unglycosylated sequence is not chemically equivalent to native drosocin, even when its amino acid backbone matches the published mature sequence.

Structural and biochemical studies connect drosocin activity to the bacterial ribosomal exit tunnel and translation termination. Its carbohydrate can make specific contacts within the ribosomal environment, helping explain why glycosylated and unglycosylated preparations behave differently. Uptake through bacterial transport systems, including SbmA in relevant models, adds a separate determinant of whole-cell activity. Drosophila genetics provides complementary experiments on peptide expression and host–microbe interactions, but these studies must distinguish mature drosocin from other products encoded by its precursor.

Laboratory notes

Specify glycosylation occupancy and carbohydrate composition at threonine 11; backbone purity alone does not define the reagent.
Confirm glycopeptide identity using suitable mass-spectrometric methods and account for glycoform heterogeneity during analysis.
Compare glycosylated and unglycosylated material under matched conditions to separate carbohydrate effects from assay variation.

Storage and reconstitution basics: storage guide.

Questions about Drosocin

Is unglycosylated drosocin equivalent to native drosocin?

No. It shares the peptide backbone but lacks the O-linked carbohydrate, which can materially affect ribosome interactions and whole-cell assay results.

Where is drosocin glycosylated?

The established O-glycosylation site is threonine 11 of the 19-residue mature peptide. The carbohydrate structure should be stated separately.

Why can precursor-level fly experiments be difficult to interpret?

The drosocin precursor also encodes a distinct peptide called buletin. Genetic changes affecting the precursor can therefore influence more than mature drosocin alone.

Is Drosocin for human use?

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

Related research peptides

All products are sold for laboratory research use only. Not for human consumption, not a medicine, not for diagnosing, treating or preventing any condition.