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The complete amino acid sequence of lychnin, a type 1 ribosome-inactivating protein (RIP) isolated from  Lychnis  chalcedonica  seeds, has been determined by automated Edman degradation and ESI-QTOF mass spectrometry. Lychnin consists of 234 amino acid residues with a molecular mass of 26 131.14 Da. All amino acid residues involved in the formation of the RIP active site (Tyr69, Tyr119, Glu170, Arg173 and Trp203) are fully conserved. Furthermore, a fast MALDI-TOF experiment showed that two out of three cysteinyl residues (Cys32 and Cys115) form a disulfide bridge, while Cys214 is in the thiol form, which makes it suitable for linking carrier molecules to generate immunotoxins and other conjugates.

Sequence determination of lychnin, a type 1 ribosome-inactivating protein from Lychnis chalcedonica seeds