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Gradients of Orientation, Composition, and Hydration of Proteins for Efficient Light Collection by the Cornea of the Horseshoe Crab.
Spaeker, Oliver; Taylor, Gavin J; Wilts, Bodo D; Slabý, Tomás; Abdel-Rahman, Mohamed Ashraf Khalil; Scoppola, Ernesto; Schmitt, Clemens N Z; Sztucki, Michael; Liu, Jiliang; Bertinetti, Luca; Wagermaier, Wolfgang; Scholtz, Gerhard; Fratzl, Peter; Politi, Yael.
Afiliación
  • Spaeker O; Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam, Germany.
  • Taylor GJ; Institute for Globally Distributed Open Research and Education (IGDORE), Ribeirão Preto, 14091-310, Brazil.
  • Wilts BD; Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Str. 2a, Salzburg, 5020, Austria.
  • Slabý T; Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, Fribourg, 1700, Switzerland.
  • Abdel-Rahman MAK; TELIGHT, Libusina trída 21, Brno, 623 00, Czech Republic.
  • Scoppola E; TELIGHT, Libusina trída 21, Brno, 623 00, Czech Republic.
  • Schmitt CNZ; Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam, Germany.
  • Sztucki M; Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam, Germany.
  • Liu J; European Synchrotron Radiation Facility (ESRF), 71 avenue des Martyrs, CS 40220, Grenoble Cedex 9, 38043, France.
  • Bertinetti L; European Synchrotron Radiation Facility (ESRF), 71 avenue des Martyrs, CS 40220, Grenoble Cedex 9, 38043, France.
  • Wagermaier W; B CUBE - Center for Molecular Bioengineering, Technische Universität Dresden, 01307, Dresden, Germany.
  • Scholtz G; Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam, Germany.
  • Fratzl P; Humboldt-University Berlin, Institute of Biology, Philippstraße 13, 10115, Berlin, Germany.
  • Politi Y; Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam, Germany.
Adv Sci (Weinh) ; 9(33): e2203371, 2022 11.
Article en En | MEDLINE | ID: mdl-36251923
The lateral eyes of the horseshoe crab, Limulus polyphemus, are the largest compound eyes within recent Arthropoda. The cornea of these eyes contains hundreds of inward projecting elongated cuticular cones and concentrate light onto proximal photoreceptor cells. Although this visual system has been extensively studied before, the precise mechanism allowing vision has remained controversial. Correlating high-resolution quantitative refractive index (RI) mapping and structural analysis, it is demonstrated how gradients of RI in the cornea stem from structural and compositional gradients in the cornea. In particular, these RI variations result from the chitin-protein fibers architecture, heterogeneity in protein composition, and bromine doping, as well as spatial variation in water content resulting from matrix cross-linking on the one hand and cuticle porosity on the other hand. Combining the realistic cornea structure and measured RI gradients with full-wave optical modeling and ray tracing, it is revealed that the light collection mechanism switches from refraction-based graded index (GRIN) optics at normal light incidence to combined GRIN and total internal reflection mechanism at high incident angles. The optical properties of the cornea are governed by different mechanisms at different hierarchical levels, demonstrating the remarkable versatility of arthropod cuticle.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Proteínas / Cangrejos Herradura Límite: Animals Idioma: En Revista: Adv Sci (Weinh) Año: 2022 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Alemania
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Proteínas / Cangrejos Herradura Límite: Animals Idioma: En Revista: Adv Sci (Weinh) Año: 2022 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Alemania