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Brzeska, Hanna, Gonzalez, Jesus, Korn, ED Edward D, Titus, MA Margaret A, (2019) ' Basic-hydrophobic (BH) sites are localized in conserved positions inside and outside of PH domains and affect localization of Dictyostelium myosin 1s. ' Mol. Biol. Cell mbcE19080475
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Abstract:Myosin 1s have critical roles in linking membranes to the actin cytoskeleton via direct binding to acidic lipids. Lipid binding may occur through PIP3/PIP2-specific PH domains or non-specific ionic interactions involving basic-hydrophobic BH sites but the mechanism of myosin 1s distinctive lipid targeting is poorly understood. Now we show that PH domains occur in all Dictyostelium myosin 1s and that the BH sites of Myo1A, B, C, D and F are in conserved positions near the ?3/?4 loops of their PH domains. In spite of these shared lipid binding sites, we observe significant differences in myosin 1s highly dynamic localizations. All myosin 1s except Myo1A are present in macropinocytic structures but only Myo1B and Myo1C are enriched at the edges of macropinocytic cups and associate with the actin in actin waves. In contrast, Myo1D, E and F are enclosed by the actin wave. Mutations of BH sites affect localization of all Dictyostelium myosin 1s. Notably, mutation of the BH site located within the PH domains of PIP3- specific Myo1D and Myo1F completely eradicates membrane binding. Thus, BH sites are important determinants of motor targeting and may have a similar role in the localization of other myosin 1s.
Status: aheadofprint Type: Journal article Source: PUBMED PubMed ID: 31774725

Genes addressed in this paper
myoA myoB myoC myoD myoE myoF
Topics in this paper
Protein Physical Properties X X X X X X
Protein Functional Domain X X X X X X
Cellular Location
Protein/Nucleic Acid Structure X X X X X X