Naslov
Unique Aggregation of Sterigmatocystin in Water Yields Strong and Specific Circular Dichroism Response Allowing Highly Sensitive and Selective Monitoring of Bio-Relevant Interactions

Autori
Jakšić, Daniela ; Šegvić Klarić, Maja ; Crnolatac, Ivo ; Šijaković Vujičić, Nataša ; Smrečki, Vilko ; Górecki, Marcin ; Pescitelli, Gennaro ; Piantanida, Ivo

Izvornik
Marine drugs (1660-3397) 17 (2019), 11; 629, 17

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
toxins ; Aspergilli ; sterigmatocystin monitoring in water ; chiral aggregation ; non-covalent DNA binding

Sažetak
We demonstrated the hitherto unknown property of the mycotoxin sterigmatocystin(STC) to provide homogeneous solutions in aqueous medium by forming a unique aggregate type(not formed by analogous aflatoxins), characterized by exceptionally strong circular dichroism(CD) bands in the 300–400 nm range. Results showed that these CD bands do not originate from intrinsic STC chirality but are a specific property of a peculiar aggregation process similar to psi-DNA CD response. Transmission electron microscopy (TEM) experiments revealed a fine fiber network resembling a supramolecular gel structure with helical fibers. Thermodynamic studies of aggregates by di erential scanning calorimetry (DSC) revealed high reversibility of the dominant aggregation process. We demonstrated that the novel STC psi-CD band at 345 nm could be applied at biorelevant conditions (100 nanomolar concentration) and even in marine- salt content conditions for specific and quantitative monitoring of STC. Also, we showed that STC strongly non-covalently interacts with ds-DNA with likely toxic effects, thus contrary to the previous belief requiring prior enzyme epoxidation.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Farmacija

POVEZANOST RADA