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• W2069897004 abstract "Dictyostelium discoideum MyoD, a long-tailed class I myosin, co-purified with two copies of a 16 kDa light chain. Sequence analysis of the MyoD light chain showed it to be a unique protein, termed MlcD, that shares 44% sequence identity with Dictyostelium calmodulin and 43% sequence identity with Acanthamoeba castellanii myosin IC light chain. MlcD comprises four EF-hands; however, EF-hands 2-4 contain mutations in key Ca2+-co-ordinating residues that would be predicted to impair Ca2+ binding. Electrospray ionization MS of MlcD in the presence of Ca2+ and La3+ showed the presence of one major and one minor metal-binding site. MlcD contains a single tryptophan residue (Trp39), the fluorescence intensity of which was quenched upon addition of Ca2+ or Mg2+, yielding apparent dissociation constants ( K'(d)) of 52 microM for Ca2+ and 450 microM for Mg2+. The low affinity of MlcD for Ca2+ indicates that it cannot function as a sensor of physiological Ca2+. Ca2+ did not affect the binding of MlcD to MyoD or to either of the two MyoD IQ (Ile-Gln) motifs. FLAG-MlcD expressed in Dictyostelium formed a complex with MyoD, but not with the two other long-tailed Dictyostelium myosin I isoenzymes, MyoB and MyoC. Through its specific association with the Ca2+-insensitive MlcD, MyoD may exhibit distinct regulatory properties that distinguish it from myosin I isoenzymes with calmodulin light chains." @default.
• W2069897004 created "2016-06-24" @default.
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• W2069897004 date "2003-09-15" @default.
• W2069897004 modified "2023-10-16" @default.
• W2069897004 title "The Dictyostelium class I myosin, MyoD, contains a novel light chain that lacks high-affinity calcium-binding sites" @default.
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• W2069897004 doi "https://doi.org/10.1042/bj20030656" @default.
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