We have studied binding and block of sodium channels by 12 derivatives of the 22-residue peptide mu-conotoxin GIIIA (mu-CTX) in which single amino acids were substituted as follows: Arg or Lys by Gln, Gln-18 by Lys, Asp by Asn, and HO-Pro by Pro. Derivatives were synthesized as described by Becker et al. [(1989) Eur. J. Biochem. 185, 79]. Binding was… (More)
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