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Organic crystal lattices in the axial filament of silica spicules of Demospongiae.

Abstract：

:The skeletal system of Demospongiae consists of siliceous spicules, which are composed of an axial channel containing an organic axial filament (AF) surrounded by a compact layer of hydrated amorphous silica. Here we report the ultrastructural investigations of the AF of siliceous spicules from two Demospongiae: Suberites domuncula and Tethya aurantium. Electron microscopy, electron diffraction and elemental mapping analyses on both longitudinal and transversal cross-sections yield that spicules's AF consist of a three-dimensional crystal lattice of six-fold symmetry. Its structure, which is the result of a biological growth process, is a crystalline assembly characterized by a lattice of organic cages (periodicity in the range of 6nm) filled with enzymatically-produced silica. In general, the six-fold lattice symmetry is reflected by the morphology of the AF, which is characterized by six-fold facets. This seems to be the result of a lattice energy minimization process similar to the situation found during the growth of inorganic crystals. Our structural exploitation of three-dimensional organic lattices generated by biological systems is expected to contribute for explaining the relation between axial filament's ultrastructure and spicule's ultimate morphology.

journal_name

J Struct Biol

journal_title

Journal of structural biology

authors

Werner P,Blumtritt H,Natalio F

doi

10.1016/j.jsb.2017.03.005

subject

Has Abstract

pub_date

2017-06-01 00:00:00

pages

186-195

issue

3

eissn

1047-8477

issn

1095-8657

pii

S1047-8477(17)30041-2

journal_volume

198

pub_type

杂志文章

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