Homobifunctional cross-linker and dimeric ActA. A,
structural formula for
N,N′-bis(iodoacetyl)-bis[2-(3-aminopropoxy)ethyl] ether, a
flexible hydrophilic cysteine-reactive cross-linker. B, purified
soluble ActA migrates with an apparent mobility of 97 kDa, whereas synthetic
ActA dimer migrates with an apparent mobility of 185 kDa by SDS-PAGE.
Molecular weight marker positions are indicated to the left of the
Coomassie-stained gel.