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Elliott, Paul ,R.,Irvine, Andrew ,F.,Jung, Hyun ,Suk,Tozawa, Kaeko,Pastok, Martyna ,W.,Picone, Remigio,Badyal, Sandip ,K.,Basran, Jaswir,Rudland, Philip ,S.,Barraclough, Roger Cell Press 2012 Structure Vol.20 No.4
<P><B>Summary</B></P><P>Filament assembly of nonmuscle myosin IIA (NMIIA) is selectively regulated by the small Ca<SUP>2+</SUP>-binding protein, S100A4, which causes enhanced cell migration and metastasis in certain cancers. Our NMR structure shows that an S100A4 dimer binds to a single myosin heavy chain in an asymmetrical configuration. NMIIA in the complex forms a continuous helix that stretches across the surface of S100A4 and engages the Ca<SUP>2+</SUP>-dependent binding sites of each subunit in the dimer. Synergy between these sites leads to a very tight association (K<SUB>D</SUB> ∼1 nM) that is unique in the S100 family. Single-residue mutations that remove this synergy weaken binding and ameliorate the effects of S100A4 on NMIIA filament assembly and cell spreading in A431 human epithelial carcinoma cells. We propose a model for NMIIA filament disassembly by S100A4 in which initial binding to the unstructured NMIIA tail initiates unzipping of the coiled coil and disruption of filament packing.</P>
Inversion of Magnetoresistance in La1−xSrxMnO3 /Nb-doped SrTiO3/CoFe Junctions
K. Ueda,K. Tozawa,H. Asano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Magnetoresistance (MR) devices using degenerated oxide semiconductors, Nb-doped SrTiO3,(Nb-STO) as intermediate layers between two ferromagnets were fabricated and their magneticand transport properties were evaluated. Magnetic junctions using the trilayer films showed MRof 5% at 4.2 K, and the sign and the magnitude of the MR were changed depending on thethickness of Nb-STO layers. The origin of the inversion of the MR is not clear, however we considerspin injection from ferromagnetic electrodes to Nb-STO through Schottky tunnel barriers plays animportant role.