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• W2002257924 abstract "The pentapeptide KIFMK, which contains three clustered hydrophobic amino acid residues of isoleucine, phenylalanine, and methionine (IFM) in the sodium channel inactivation gate on the cytoplasmic linker between domains III and IV (III-IV linker), is known to restore fast inactivation to the mutant sodium channels having a defective inactivation gate or to accelerate the inactivation of the wild-type sodium channels. To investigate the docking site of KIFMK and to clarify the mechanisms for restoring the fast inactivation, we have studied the interactions between KIFMK and the fragment peptide in the III-IV linker GGQDIFMTEEQK (MP-1A; G1484-K1495 in rat brain IIA) by one- and two-dimensional 1H-NMR and circular dichroism (CD) spectroscopies. KIFMK was found to increase the helical content of MP-1A in 80% trifluoroethanol (TFE) solution by ∼11%. A pentapeptide, KIFMT, which can restore inactivation but less effectively than KIFMK, also increased the helical content of MP-1A, but to a lesser extent (∼6%) than did KIFMK. In contrast, KDIFMTK, which is ineffective in restoring inactivation, decreased the helical content (∼−4%). Furthermore, we studied the interactions between KIFMK and modified peptides from MP-1A, that is, MP-1NA (D1487N), MP-1QEA (E1492Q), or MP-1EQA (E1493Q). The KIFMK was found to increase the helical content of MP-1EQA to an extent nearly identical to that of MP-1A, whereas it was found to decrease those of MP-1NA and MP-1QEA. These findings mean that KIFMK, by allowing each of the Lys residues to interact with D1487 and E1492, respectively, stabilized the helical structure of the III-IV linker around the IFM residues. This helix-stabilizing effect of KIFMK on the III-IV linker may restore and/or accelerate fast inactivation to the sodium channels having a defective inactivation gate or to wild-type sodium channels." @default.
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• W2002257924 date "1999-09-01" @default.
• W2002257924 modified "2023-10-16" @default.
• W2002257924 title "1H-NMR and Circular Dichroism Spectroscopic Studies on Changes in Secondary Structures of the Sodium Channel Inactivation Gate Peptides as Caused by the Pentapeptide KIFMK" @default.
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• W2002257924 doi "https://doi.org/10.1016/s0006-3495(99)76985-7" @default.
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