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The Biomineralization Proteome: Protein Complexity for a Complex Bioceramic Assembly Process.

John Spencer Evans1

  • 1Laboratory for Chemical Physics, Department of Skeletal and Craniofacial Biology, New York University College of Dentistry, New York, NY, 10010, USA.

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Summary

Organisms create biominerals through biomineralization. Comparing vertebrate bone and mollusk shells reveals shared protein functions in mineral formation, suggesting conserved evolutionary features.

Keywords:
biomineralizationmollusk shellnacre layerprismatic layervertebrate bone

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Area of Science:

  • Biomineralization research
  • Skeletal system biology
  • Molecular biomineralization

Background:

  • Over 62 different biominerals exist, generated by diverse organisms for survival.
  • Biomineralization is a key biological process for skeletal formation.
  • Understanding the molecular mechanisms is crucial for regenerative medicine and materials science.

Purpose of the Study:

  • To review the process of biomineralization and its molecular mechanisms.
  • To comparatively explore the secretomes of vertebrate bone (calcium phosphate) and invertebrate mollusk shell (calcium carbonate).
  • To identify conserved molecular features in skeletal secretomes.

Main Methods:

  • Comparative analysis of secretomes from vertebrate bone and mollusk shell.
  • Identification of functional categories of proteins involved in mineral formation.
  • Analysis of molecular features of mineral-associated proteins.

Main Results:

  • Both skeletal secretomes share proteins in four functional categories: matrix formers, nucleation assisters, communicators, and remodelers.
  • Mineral-associated proteins exhibit unique sequences with conserved domains, intrinsic disorder, PTMs, redundancy, and aggregation-prone regions.
  • Mollusk shell secretomes are more complex, with more protein subcategories for calcium carbonate nucleation and organization.

Conclusions:

  • Conserved molecular features facilitate mineral formation and organization across different skeletal systems.
  • Evolutionary links exist between mollusk shell and bone biomineralization processes.
  • The complexity of the mollusk shell secretome reflects its exoskeletal requirements.