Massive Accumulation of Strontium and Barium in Diplonemid Protists

0571497 - BC 2024 RIV US eng J - Článek v odborném periodiku
Pilátová, Jana - Tashyreva, Daria - Týč, Jiří - Vancová, Marie - Bokhari, Syed Nadeem Hussain - Skoupý, Radim - Klementová, Mariana - Küpper, Hendrik - Mojzeš, P. - Lukeš, Julius
Massive Accumulation of Strontium and Barium in Diplonemid Protists.
mBio. Roč. 14, JAN (2023), č. článku 1. ISSN 2161-2129. E-ISSN 2150-7511
Grant CEP: GA MŠMT(CZ) EF16_019/0000759; GA MŠMT EF15_003/0000336; GA MŠMT(CZ) EF16_013/0001775; GA MŠMT(CZ) LL1601; GA MŠMT(CZ) LM2018129; GA ČR(CZ) GA21-26115S; GA MŠMT(CZ) EF18_046/0016045
Grant ostatní: Gordon and Betty Moore Foundation(US) #9354
Program: Science
Výzkumná infrastruktura: CzechNanoLab - 90110; CzechNanoLab II - 90251
Institucionální podpora: RVO:60077344 ; RVO:68081731 ; RVO:68378271
Klíčová slova: Euglenozoa * barite * biocrystallization * biogeochemical cycles * celestite
Obor OECD: Cell biology; Electrical and electronic engineering (UPT-D); Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
Impakt faktor: 6.4, rok: 2022
Způsob publikování: Open access
https://journals.asm.org/doi/10.1128/mbio.03279-22

Barium and strontium are often used as proxies of marine productivity in palaeoceanographic reconstructions of global climate. However, long-searched biological drivers for such correlations remain unknown. Here, we report that taxa within one of the most abundant groups of marine planktonic protists, diplonemids (Euglenozoa), are potent accumulators of intracellular barite (BaSO4), celestite (SrSO4), and strontiobarite (Ba,Sr)SO4. In culture, Namystinia karyoxenos accumulates Ba2+ and Sr2+ 42,000 and 10,000 times higher than the surrounding medium, forming barite and celestite representing 90% of the dry weight, the greatest concentration in biomass known to date. As heterotrophs, diplonemids are not restricted to the photic zone, and they are widespread in the oceans in astonishing abundance and diversity, as their distribution correlates with environmental particulate barite and celestite, prevailing in the mesopelagic zone. We found diplonemid predators, the filter-feeding zooplankton that produces fecal pellets containing the undigested celestite from diplonemids, facilitating its deposition on the seafloor. To the best of our knowledge, evidence for diplonemid biomineralization presents the strongest explanation for the occurrence of particulate barite and celestite in the marine environment. Both structures of the crystals and their variable chemical compositions found in diplonemids fit the properties of environmentally sampled particulate barite and celestite. Finally, we propose that diplonemids, which emerged during the Neoproterozoic era, qualify as impactful players in Ba2+/Sr2+ cycling in the ocean that has possibly contributed to sedimentary rock formation over long geological periods. IMPORTANCE We have identified that diplonemids, an abundant group of marine planktonic protists, accumulate conspicuous amounts of Sr2+ and Ba2+ in the form of intracellular barite and celestite crystals, in concentrations that greatly exceed those of the most efficient Ba/Sr-accumulating organisms known to date. We propose that diplonemids are potential players in Ba2+/Sr2+ cycling in the ocean and have possibly contributed to sedimentary rock formation over long geological periods. These organisms emerged during the Neoproterozoic era (590 to 900 million years ago), prior to known coccolithophore carbonate biomineralization (similar to 200 million years ago). Based on reported data, the distribution of diplonemids in the oceans is correlated with the occurrence of particulate barite and celestite. Finally, diplonemids may provide new insights into the long-questioned biogenic origin of particulate barite and celestite and bring more understanding of the observed spatial-temporal correlation of the minerals with marine productivity used in reconstructions of past global climate.
Trvalý link: https://hdl.handle.net/11104/0343721