||||||||||Journal: Structural and Biochemical Characterization of EFhd1/Swiprosin-2, an Actin-Binding Protein in Mitochondria. (Pubmed Central) - Feb 5, 2021 In addition, we found that EFhd1 has Ca-independent β-actin-binding and Ca-dependent β-actin-bundling activities. These findings suggest that EFhd1, an actin-binding and -bundling protein in the mitochondria, may contribute to the Ca-dependent regulation of mitochondrial morphology and energy synthesis.