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Natural hybrid silica/protein superstructure at atomic resolution.

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Area of Science:

  • Biomineralization
  • Structural Biology
  • Materials Science

Background:

  • Demosponges form silica spicules via a biomineralization process guided by protein scaffolds.
  • Silicateins are key enzymes in this process, forming hybrid silica/protein structures.
  • The tertiary structure of silicatein, vital for its function, remained unknown.

Purpose of the Study:

  • To determine the atomic structure of silicatein and its associated mineral/organic assembly.
  • To elucidate the mechanism of spicule formation and silicatein's role in vivo.
  • To understand the crystallization and superstructure formation of silicatein.

Main Methods:

  • Serial X-ray crystallography was employed to analyze 2-µm-thick filaments in situ.
  • High-resolution transmission electron microscopy (HR-TEM) was used for imaging and chemical analysis.
  • Combined techniques provided insights into enzymatic activity and structural assembly.

Main Results:

  • The atomic structure of silicatein and the hybrid silica/protein assembly was resolved at 2.4 Å.
  • Detailed information on silicatein's enzymatic activity, crystallization, and superstructure formation was obtained.
  • A functional, three-dimensional silica/protein superstructure was observed in vivo.

Conclusions:

  • The study provides the first atomic-resolution structure of silicatein and its biomineralization complex.
  • This reveals the mechanism by which silicatein directs silica morphogenesis in spicules.
  • The findings offer insights into naturally occurring crystalline mineral/protein assemblies with biotechnological potential.