Extremophilic electroactive microorganisms: Promising biocatalysts for bioprocessing applications

Humin‐promoted microbial electrosynthesis of acetate from CO2 by Moorella thermoacetica

“…However, humin still contributed as a solid‐phase electron mediator for CO 2 ‐fixing acetogenesis, even in the presence of hydrogen, although the decrease in the electron equivalents via humin suggested the preferable use of hydrogen as an electron donor. The contribution of DET from the cathode to the bacterium was very small (less than 0.5 meq/chamber), although M. thermoacetica is electroactive (Chaudhary et al, 2022; Philips et al, 2016), indicating that DET was less favored compared with humin and electrolyzed hydrogen in this MES.…”

“…The CO 2 solubility in water at 55°C is still high (18.4 mmol‐CO 2 /L, Carroll et al, 1991). An acetogenic electroactive thermophile Moorella thermoacetica (Chaudhary et al, 2022; Philips et al, 2016) has been used to resolve the biochemistry of the Wood–Ljungdahl pathway (Drake et al, 2008). However, to date, only two studies have used M. thermoacetica in DET‐based MESs.…”

Geoalkalibacter halelectricus SAP‐1 sp. nov. possessing extracellular electron transfer and mineral‐reducing capabilities from a haloalkaline environment

“…Expanding the database of EET‐capable extremophiles is pivotal to unravel their EET mechanisms and associated components, understand their roles in mineral cycling or biogeochemical processes via EET in such extreme environments, and leverage their full potential for various promising microbial electrochemical technologies. It may also reveal unknown microbial diversity and metabolic capabilities in extreme environments (Chaudhary et al, 2022). The EET‐capable haloalkaliphiles can survive and function under extreme haloalkaline conditions.…”

“…Studying electromicrobiology of the extreme habitats is desired to broaden the understanding and ecology of EAMs and their roles in biogeochemical processes, novel EET pathways and components, and exploring their unique metabolic traits for different bioelectrochemical applications (Babu et al, 2015; Chaudhary et al, 2022; Dopson et al, 2016; Rampelotto, 2013; Shrestha et al, 2018). The improved understanding of ecology and diversity of EET‐capable extreme microorganisms may also provide clues about extraterrestrial life on other planets with implications to the Astrobiology field (Ren et al, 2019).…”

“…The improved understanding of ecology and diversity of EET‐capable extreme microorganisms may also provide clues about extraterrestrial life on other planets with implications to the Astrobiology field (Ren et al, 2019). Furthermore, it will provide additional microbial resources essential to broaden the understanding of metabolic evolution and molecular‐level adaptations according to extreme environmental conditions (Arora & Panosyan, 2019; Chaudhary et al, 2022).…”