Moorella

Abstract Moo.rel'la. N.L. fem. n. Moorella in honor of W.E.C. (Ed) Moore, an American bacteriologist, who worked with anaerobes. In early exponential growth phase, cells stain Gram‐positive. However, some species stain negative during the late exponential and stationary growth phases. Straight rods with a tendency to polymorphism under stress conditions such as high glucose or high acetate concentrations. Physiology is obligately anaerobic , thermophilic , and chemolithoautotrophic and / or heterotrophic ; produces acetate as sole or main fermentation product from sugars, C 1 carbon sources, and other substrates. Produces nearly 3 moles of acetate per mole of glucose consumed, which is sometimes called “homoacetogenic” fermentation. While growing on substrates other than hexoses, CO, or CO 2 /H 2 , Moorella species can produce various products. May use nitrate, nitrite or fumarate as electron acceptors. Forms various aromatic compounds via decarboxylation of arylic acids, which are used as CO 2 donors under CO 2 ‐limited conditions. The cell wall contains LL ‐diaminopimelate (DAP). DNA G + C content ( mol %): 53–55. Type species : Moorella thermoacetica (Fontaine, Peterson, McCoy, Johnson and Ritter 1942) Collins, Lawson, Willems, Cordoba, Fernández‐Garayzábal, Garcia, Cai, Hippe and Farrow 1994, 824 VP ( Clostridium thermoaceticum Fontaine, Peterson, McCoy, Johnson and Ritter 1942, 705). Taxonomic and Nomenclature Notes According to the List of Prokaryotic names with Standing in Nomenclature (LPSN), the taxonomic status of the genus Moorella is: correct name (last update, February 2025) * . LPSN classification: Bacteria / Bacillati / Bacillota / Clostridia / Moorellales / Moorellaceae / Moorella The genus Moorella can also be recovered in the Genome Taxonomy Database (GTDB) as g__Moorella (version v220) ** . GTDB classification: d__Bacteria / p__Bacillota_B / c__Moorellia / o__Moorellales / f__Moorellaceae / g__Moorella * Meier‐Kolthoff et al. ( 2022 ). Nucleic Acids Res , 50 , D801 – D807 ; DOI: 10.1093/nar/gkab902 ** Parks et al. ( 2022 ). Nucleic Acids Res , 50 , D785 – D794 ; DOI: 10.1093/nar/gkab776