Self-Assembly of Highly Phosphorylated Silaffins and Their Function in 
Biosilica Morphogenesis

Kröger, Nils; Lorenz, Sonja; Brunner, Eike; Sumper, Manfred

doi:10.1126/science.1076221

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Self-Assembly of Highly Phosphorylated Silaffins and Their Function in Biosilica Morphogenesis

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Lorenz, Sonja
Research Group Ubiquitin Signaling Specificity, MPI for Biophysical Chemistry, Max Planck Society;
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Citation

Kröger, N., Lorenz, S., Brunner, E., & Sumper, M. (2002). Self-Assembly of Highly Phosphorylated Silaffins and Their Function in Biosilica Morphogenesis. Science, 298(5593), 584-586. doi:10.1126/science.1076221.

Cite as: https://hdl.handle.net/21.11116/0000-000C-3AB6-6

Abstract

Silaffins are uniquely modified peptides that have been implicated in the biogenesis of diatom biosilica. A method that avoids the harsh anhydrous hydrogen fluoride treatment commonly used to dissolve biosilica allows the extraction of silaffins in their native state. The native silaffins carry further posttranslational modifications in addition to their polyamine moieties. Each serine residue was phosphorylated, and this high level of phosphorylation is essential for biological activity. The zwitterionic structure of native silaffins enables the formation of supramolecular assemblies. Time-resolved analysis of silica morphogenesis in vitro detected a plastic silaffin-silica phase, which may represent a building material for diatom biosilica.