Mutations in polypeptide 2C are directly responsible for altered guanidine sensitivity in poliovirus.
cDNA fragments representing the region in polypeptide 2C containing mutations in a guanidine-resistant or -dependent mutant were cloned into the wild-type background of an infectious clone. Transfection of COS-1 cells with these plasmids yielded viruses that were either completely resistant to 2.0 mM guanidine hydrochloride or dependent on this concentration of drug for growth.
Pincus et al. (Sat,) studied this question.