Details

Autor(en) / Beteiligte

• Baranova, Anna A.
• Chistov, Alexey A.
• Shuvalov, Maxim V.
• Tyurin, Anton P.
• Biryukov, Mikhail V.
• Ivanov, Igor A.
• Sadykova, Vera S.
• Kurakov, Aleksander V.
• Sergeeva, Albina I.
• Korshun, Vladimir A.
• Alferova, Vera A.

Titel

Identification of isocyclosporins by collision-induced dissociation of doubly protonated species

Ist Teil von

• Talanta (Oxford), 2021-04, Vol.225, p.121930-121930, Article 121930

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2021

Quelle

MEDLINE

Beschreibungen/Notizen

• Nonribosomal cyclopeptide cyclosporin A (CsA), produced by fungus Tolypocladium inflatum, is an extremely important immunosuppressive drug used in organ transplantations and for therapy of autoimmune diseases. Here we report for the first time production of CsA, along with related cyclosporins B and C, by Tolypocladium inflatum strains of marine origin (White Sea). Cyclosporins A–C contain an unusual amino acid, (4R)-4-((E)-2-butenyl)-4,N-dimethyl-l-threonine (MeBmt), and are prone to isomerization to non-active isocyclosporin by N→O acyl shift of valine connected to MeBmt in acidic conditions. CsA and isoCsA are not distinguishable in MS analysis of [M+H]+ ions due to rapid [CsA + H]+→[isoCsA + H]+ conversion. We found that the N→O acyl shift is completely suppressed in cyclosporine [M+2H]2+ ions, and their collision-induced dissociation (CID) can be used for rapid and unambiguous analysis of cyclosporins and isocylosporins. Fragmentation patterns of [CsA+2H]2+ and [isoCsA+2H]2+ ions were analyzed and explained. The developed approach could be useful for MS analysis of other peptides containing β-hydroxy-α-amino acids. [Display omitted] •Characteristic N→O acyl shift in cyclosporins is suppressed in doubly protonated ions.•Analysis of CID spectra of doubly protonated ions reveals unique fragmentation routes.•Double protonation of cyclosporins yields more intense peaks vs. single protonation.•Dereplication techniques can be based on analysis of doubly protonated peptide CID.•High degree of fragmentation is easily achieved for doubly protonated peptides.