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2016 ; 7
(ä): 13144
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The uronic acid content of coccolith-associated polysaccharides provides insight
into coccolithogenesis and past climate
#MMPMID27782214
Lee RB
; Mavridou DA
; Papadakos G
; McClelland HL
; Rickaby RE
Nat Commun
2016[Oct]; 7
(ä): 13144
PMID27782214
show ga
Unicellular phytoplanktonic algae (coccolithophores) are among the most prolific
producers of calcium carbonate on the planet, with a production of ?10(26)
coccoliths per year. During their lith formation, coccolithophores mainly employ
coccolith-associated polysaccharides (CAPs) for the regulation of crystal
nucleation and growth. These macromolecules interact with the intracellular
calcifying compartment (coccolith vesicle) through the charged carboxyl groups of
their uronic acid residues. Here we report the isolation of CAPs from modern day
coccolithophores and their prehistoric predecessors and we demonstrate that their
uronic acid content (UAC) offers a species-specific signature. We also show that
there is a correlation between the UAC of CAPs and the internal saturation state
of the coccolith vesicle that, for most geologically abundant species, is
inextricably linked to carbon availability. These findings suggest that the UAC
of CAPs reports on the adaptation of coccolithogenesis to environmental changes
and can be used for the estimation of past CO(2) concentrations.