Interplay between arsenic and selenium biomineralization in Shewanella sp. O23S
| Autor: | Lucian C. Staicu, Paulina J. Wójtowicz, Zsombor Molnár, Encarnación Ruiz-Agudo, José Luis R. Gallego, Diego Baragaño, Mihály Pósfai |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
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| Popis: | Bacteria play crucial roles in the biogeochemical cycle of arsenic (As) and selenium (Se) as these elements are metabolized via detoxification, energy generation (anaerobic respiration) and biosynthesis (e.g. selenocysteine) strategies. To date, arsenic and selenium biomineralization in bacteria were studied separately. In this study, the anaerobic metabolism of As and Se in Shewanella sp. O23S was investigated separately and mixed, with an emphasis put on the biomineralization products of this process. Multiple analytical techniques including ICP-MS, TEM-EDS, XRD, Micro-Raman, spectmphotometry and surface charge (zeta potential) were employed. Shewanella sp. O23S is capable of reducing selenate (SeO42-) and selenite (SeO32-) to red Se(-S)(0), and arsenate (AsO43-) to arsenite (AsO33-). The release of H2S from cysteine led to the precipitation of AsS minerals: nanorod AsS and granular As2S3. When As and Se oxyanions were mixed, both As-S and Se(-S)(0) biominerals were synthesized. All biominerals were extracellular, amorphous and presented a negative surface charge (-24 to -38 mV). Kinetic analysis indicated the following reduction yields: SeO32- (90%), AsO43- (60%), and SeO42- ( National Science Centre, Poland 2017/26/D/NZ1/00408 Plan de Recuperacion, Transformacion y Resiliencia, through Universidad de Oviedo MU-21-UP2021-030 32892642 Spanish Government European Commission RTI2018-099565-B-I00 PCI2019-111927-2 Junta de Andalucia RNM-179 University of Granada UCE-PP2016-05 National Research, Development & Innovation Office (NRDIO) - Hungary NKFIH-471-3/202 European UnionNextGeneration EU, Ministerio de Universidades |
| Databáze: | OpenAIRE |
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