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PSCD Domains of Pleuralin-1 from the Diatom Cylindrotheca fusiformis : NMR Structures and Interactions with Other Biosilica-Associated Proteins

De Sanctis, Silvia ; Wenzler, Michael ; Kröger, Nils ; Malloni, Wilhelm M. ; Sumper, Manfred ; Deutzmann, Rainer ; Zadravec, Patrick ; Brunner, Eike ; Kremer, Werner ; Kalbitzer, Hans Robert



Abstract

Diatoms are eukaryotic unicellular algae characterized by silica cell walls and associated with three unique protein families, the pleuralins, frustulins, and silaffins. The NMR structure of the PSCD4 domain of pleuralin-1 from Cylindrotheca fusiformis contains only three short helical elements and is stabilized by five unique disulfide bridges. PSCD4 contains two binding sites for Ca2+ ions with ...

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