Details

Autor(en) / Beteiligte

• Dhar, Amlanjyoti
• Ahmed, Israr
• Mallick, Shampa
• Roy, Siddhartha

Titel

A Peptide‐PNA Hybrid Beacon for Sensitive Detection of Protein Biomarkers in Biological Fluids

Ist Teil von

• Chembiochem : a European journal of chemical biology, 2020-08, Vol.21 (15), p.2121-2125

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• Specific and rapid detection of proteins in biological fluids poses a challenging problem. In biological fluids, many proteins are present at low concentrations, requiring high affinity and specificity of the beacon‐protein interaction. We report the design of a peptide‐PNA hybrid beacon that exploits the dimeric nature of a target protein, S100B, a biomarker for brain trauma, to enhance binding affinity and specificity. The complementary base‐pairing of the PNA bases brings the two arms of the beacon, one carrying an Alexa tag and the other carrying a Dabcyl moiety, into proximity, thus quenching Alexa fluorescence. Each of the arms carries a sequence that binds to one of the subunits. Binding to the target separates the quencher from the probe lifting the quenching of fluorescence. Enhanced affinity and specificity resulting from simultaneously binding to two sites allowed specific detection of S100B at low‐nanomolar concentrations in the presence of serum. The design can be easily adapted for the detection of proteins containing multiple binding sites and could prove useful for rapid and sensitive biomarker detection. Needle in a haystack: A fluorescence‐based peptide‐PNA hybrid beacon targeting the S100B protein, a biomarker for brain trauma, has been developed. The molecular beacon is capable of detecting nanomolar concentrations of S100B protein rapidly, even in the presence of serum. The design should be useful for developing molecular beacons for other protein biomarkers.