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- W2000989654 endingPage "e75119" @default.
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- W2000989654 abstract "Among the neuronal binding partners of calmodulin (CaM) are Munc13 proteins as essential presynaptic regulators that play a key role in synaptic vesicle priming and are crucial for presynaptic short-term plasticity. Recent NMR structural investigations of a CaM/Munc13-1 peptide complex have revealed an extended structure, which contrasts the compact structures of most classical CaM/target complexes. This unusual binding mode is thought to be related to the presence of an additional hydrophobic anchor residue at position 26 of the CaM binding motif of Munc13-1, resulting in a novel 1-5-8-26 motif. Here, we addressed the question whether the 1-5-8-26 CaM binding motif is a Munc13-related feature or whether it can be induced in other CaM targets by altering the motif's core residues. For this purpose, we chose skeletal muscle myosin light chain kinase (skMLCK) with a classical 1-5-8-14 CaM binding motif and constructed three skMLCK peptide variants mimicking Munc13-1, in which the hydrophobic anchor amino acid at position 14 was moved to position 26. Chemical cross-linking between CaM and skMLCK peptide variants combined with high-resolution mass spectrometry yielded insights into the peptides' binding modes. This structural comparison together with complementary binding data from surface plasmon resonance experiments revealed that skMLCK variants with an artificial 1-5-8-26 motif cannot mimic CaM binding of Munc13-1. Apparently, additional features apart from the spacing of the hydrophobic anchor residues are required to define the functional 1-5-8-26 motif of Munc13-1. We conclude that Munc13 proteins display a unique CaM binding behavior to fulfill their role as efficient presynaptic calcium sensors over broad range of Ca2+ concentrations." @default.
- W2000989654 created "2016-06-24" @default.
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- W2000989654 date "2013-10-10" @default.
- W2000989654 modified "2023-09-27" @default.
- W2000989654 title "Munc13-Like skMLCK Variants Cannot Mimic the Unique Calmodulin Binding Mode of Munc13 as Evidenced by Chemical Cross-Linking and Mass Spectrometry" @default.
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- W2000989654 doi "https://doi.org/10.1371/journal.pone.0075119" @default.
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