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ADC Payload and Linker Design: A Chemistry Review Framework
ADC linker–payload design is a coupled optimization problem: payload function sets physicochemical and analytical demands, while the linker determines attachment, stability, and the chemical form released. A 2026 review by Samson Gebretnsae describes options ranging from established cytotoxic classes to emerging immune-stimulating, degradation, metabolic, and photoactivated concepts. For R&D teams, the useful output is not a rank order of modalities but a matrix of testable material attributes.
Reported Phosphorylated ADC Linker and DAR Design
Conventional ADC development often starts with antigen binding, linker stability, and cytotoxic payload release. A phosphorylated payload concept changes the payload question. The reported payload is not framed as a classic cytotoxin; it is framed as a polar phosphorylated molecule intended to support an intracellular recognition hypothesis.
Reported MK-0616 Route Analysis Highlights Peptide Biocatalysis
The reported retrosynthetic map treats MK-0616 as a fragment-intensive macrocyclic peptide program, with multiple non-natural amino acid building blocks that must be controlled before final assembly. That architecture shifts the development question from simple peptide coupling to building-block access, stereochemical control, impurity management, and fragment supply reliability.
Reported TFA Cleavage Tactics for Cys S-tert-Butylation in SPPS
In Fmoc/tBu solid-phase peptide synthesis, cysteine can become vulnerable during final acidic cleavage because side-chain protecting groups and resin cleavage chemistry generate reactive tert-butyl species. Reported process-development work describes S-tert-butylated cysteine as an impurity formed when tert-butyl cations re-attack deprotected Cys thiols during the TFA cleavage step.
DHODH Inhibitor as ADC Payload: A Linker Chemistry Case Study
DHODH (dihydroorotate dehydrogenase) catalyzes the fourth step of de novo pyrimidine synthesis. BAY-2402234 is a Bayer-originated DHODH inhibitor reported in the paper with enzyme-level potency in the low-nanomolar range. As an ADC payload, it introduces a mechanism distinct from microtubule inhibitors and DNA-damaging agents: pyrimidine starvation.
Reported Coil-Tag Assembly for Site-Specific ADC Conjugation
The reported Coil-Tag concept pairs an engineered coiled-coil sequence on an antibody with a complementary payload-bearing peptide. For ADC teams, the important idea is architectural: antibody expression, peptide synthesis, aqueous assembly, and purification are described as separable development modules.