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- W2024544186 abstract "An increasing number of ion channels have been found to be regulated by the direct binding of calmodulin (CaM), but its structural features are mostly unknown. Previously, we identified the Ca(2+)-dependent and -independent interactions of CaM to the voltage-gated sodium channel via an IQ-motif sequence. In this study we used the trypsin-digested CaM fragments (TR(1)C and TR(2)C) to analyze the binding of Ca(2+)-CaM or Ca(2+)-free (apo) CaM with a sodium channel-derived IQ-motif peptide (NaIQ). Circular dichroic spectra showed that NaIQ peptide enhanced alpha-helicity of the CaM C-terminal lobe, but not that of the CaM N-terminal lobe in the absence of Ca(2+), whereas NaIQ enhanced the alpha-helicity of both the N- and C-terminal lobes in the presence of Ca(2+). Furthermore, the competitive binding experiment demonstrated that Ca(2+)-dependent CaM binding of target peptides (MLCKp or melittin) with CaM was markedly suppressed by NaIQ. The results suggest that IQ-motif sequences contribute to prevent target proteins from activation at low Ca(2+) concentrations and may explain a regulatory mechanism why highly Ca(2+)-sensitive target proteins are not activated in the cytoplasm." @default.
- W2024544186 created "2016-06-24" @default.
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- W2024544186 date "2003-07-01" @default.
- W2024544186 modified "2023-09-24" @default.
- W2024544186 title "Regulatory interaction of sodium channel IQ-motif with calmodulin C-terminal lobe" @default.
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- W2024544186 doi "https://doi.org/10.1016/s0006-291x(03)01183-5" @default.
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