Characterization on organic matrix proteins enclosed in high Mg-calcite crystals of the coralline sponge Spirastrella (Acanthochaetetes) wellsi
1996Geol. Inst. der Georg-august-Univ., Göttingen
Article in Anthology
Verlagsversion
Englisch
Bergbauer, Matthias; Lange, Robert; Reitner, Joachim, 1996: Characterization on organic matrix proteins enclosed in high Mg-calcite crystals of the coralline sponge Spirastrella (Acanthochaetetes) wellsi. In: Globale und regionale Steuerungsfaktoren biogener Sedimentation, DOI: 10.23689/fidgeo-2712.
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Protein components found in freeze-dried specimens of
the coralline sponge Spirastrella (Acanthochaetetes) wellsi
were separated and characterized . Proteins extracted from
skeleton crystals (matrix proteins) contained high concentrations
of glycin (16 %) as weil as enhanced amounts of
asparagin/aspartic acid (11 %) and glutamin/glutamic acid
(10 %). At least 10 proteins could be separated by SDSPAGE.
Six of them, with molecular weights between 30 and
45 kDa, may be considered as distinct matrix proteins. The
bulk of total soluble proteins as weil as all soluble matrix
proteins are acidic with pH values below 5. Our results indicate
that at least in one stage crystal growth is matrix mediated,
i.e. controlled by the sponge.