The company is the world market leader in manufacturing and sale of analytical standards of microcystins (MCs). Deep research of the toxin group resulted in many scientific papers and pioneering work to understand structure-activity relationships (SAR).
Using our proprietary payload production platform we opened up a well-known group of highly potent toxins to improve its properties, made them clickable to linkers/MABs, and made them proprietary.
Naturally occurring microcystins are transported into cells either by OATP1B1 or OATP1B3 or by both. Essential amino acids for bioactivity, selective transport and potency have been identified through SAR investigations based on 22 structural variants. We focus on those microcystins which are non-toxic to healthy tissue but show a high toxicity in certain tumor cells. The toxins are only toxic if released in the tumor cell, e.g. mediated by the MAB of the ADC. They are non-toxic for non-malignant tissue if accidently released.
We made known highly potent toxins with a new mode of action suitable for use in ADCs: