A non-penetrating thiol reagent mimics cytochalasin a inhibition of secretory protein synthesis

Mimicry of selective cytochalasin A (CA) inhibition of cellulase synthesis in the water mold Achlya by the non-penetrating thiol reagent, p-chloromercuribenzene sulphonate suggests that CA may act as a non-permeant sulphydryl reagent, and that inhibition of cellulase synthesis may be exerted via relatively superficial thiol groups in the plasma membrane.