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- W2039790924 abstract "μ‐Conotoxin GIIIA, a peptide toxin isolated from the marine snail Conus geographus , preferentially blocks skeletal muscle sodium channels in vertebrates. In this study, analogs of μ‐conotoxin GIIIA in which essential Arg‐13 was replaced with arginine analogs consisting of a piperidyl framework to regulate length and direction of the side chain were synthesized. Synthesized analogs exhibited similar CD and NMR spectra to that of GIIIA, suggesting a three‐dimensional structure identical to that of the native toxin. The biological activities of piperidyl analogs were decreased or lost despite the small change in the side chain of Arg‐13. The investigated structure–activity relationships in inhibiting electrically stimulated muscle contraction suggest that the guanidinium group at amino acid position 13 interacts best when spaced with three to four carbons and placed in a vertical direction from the peptide loop. Thus, the position of the guanidinium group at Arg‐13 of GIIIA must be located in a certain range for its strong interaction with the channel protein." @default.
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- W2039790924 date "2001-08-10" @default.
- W2039790924 modified "2023-10-14" @default.
- W2039790924 title "Modification of Arg‐13 of μ‐conotoxin GIIIA with piperidinyl‐Arg analogs and their relation to the inhibition of sodium channels" @default.
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- W2039790924 doi "https://doi.org/10.1016/s0014-5793(01)02714-4" @default.
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