Substituted cysteine accessibility of the third transmembrane domain of the creatine transporter: defining a transport pathway.

Abstract excerpt

Twenty-two amino acid residues from transmembrane domain 3 of the creatine transporter were replaced, one at a time, with cysteine. The background for mutagenesis was a C144S mutant retaining approximately 75% of wild-type transport activity but resistant to methanethiosulfonate (MTS) reagents. Each substitution mutant was tested for creatine transport activity and sensitivity to the following MTS reagents:...

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