Anti-E. coli Stx2B (Urtoxazumab)-SPDB-DM4 ADC (ADC-W-2139)

This ADC product is comprised of an anti-E. coli Stx2B monoclonal antibody conjugated via a SPDB linker to DM4. The DM4 is targeted to certain cancers by immunerecognition and delivered into cancer cells via receptor mediated endocytosis. Within the cell, DM1 binds to tubulins, interrupts microtubule dynamics, and subsequently, induces cell death.

 ADC Target

  • Name
  • E. coli Stx2B
  • Alternative Names
  • E. coli Stx2B
  • Overview
  • Shiga toxins are a family of related toxins with two major groups, Stx1 and Stx2, expressed by genes considered to be part of the genome of lambdoid prophages. The toxin has two subunits—designated A(mol. wt. 32000 D) and B(mol. wt. 7700 D)—and is one of the AB5 toxins. The B subunit is a pentamer that binds to specific glycolipids on the host cell, specifically globotriaosylceramide (Gb3). Following this, the A subunit is internalised and cleaved into two parts. The A1 component then binds to the ribosome, disrupting protein synthesis.

 ADC Antibody

  • Overview
  • Humanized Anti-E. coli Stx2B IgG1-kappa antibody, Urtoxazumab
  • Generic name
  • Urtoxazumab
  • Host animal
  • Mouse

 ADC Linker

  • Name
  • SPDB (N-succinimidyl-4-(2-pyridyldithio)butyrate)
  • Description
  • Disulfide Linkers, are extensively exploited as a chemically labile linkage. Since the release of disulfide-linked drugs requires a cytoplasmic thiol cofactor, such as glutathione (GSH). Disulfides maintain stable at physiological pH and only when ADCs are internalized inside cells, the cytosol provides reducing environment including intracellular enzyme protein disulfide isomerase, or similar enzymes, drugs can be released.

 ADC payload drug

  • Name
  • DM4 (N2'-Deacetyl-N2'-(4-mercapto-4-methyl-1-oxopentyl)maytansine)
  • Description
  • Derived from Maytansinoid,a group of cytotoxins structurally similar to rifamycin, geldanamycin, and ansatrienin. The eponymous natural cytotoxic agent maytansine is a 19-member lactam (ansa macrolide) structure originally isolated from the Ethiopian shrub Maytenus ovatus. Maytansinoids can bind to tubulin at or near the vinblastine-binding site, which interfere the formation of microtubules and depolymerize already formed microtubules, inducing mitotic arrest in the intoxicated cells.

For Research Use Only. NOT FOR CLINICAL USE.


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