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. 2021 Sep 30;36(4):ME21045. doi: 10.1264/jsme2.ME21045

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2021 by Japanese Society of Microbial Ecology / Japanese Society of Soil Microbiology / Taiwan Society of Microbial Ecology / Japanese Society of Plant Microbe Interactions / Japanese Society for Extremophiles.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 1. — Phylogenetic affiliation and metabolic functions of major microbial constituents in a psychrophilic up-flow anaerobic sludge blanket (UASB) reactor treating synthetic soy sauce wastewater. A distance matrix tree was constructed based on the amino acid sequences of 400 conserved proteins using PhyloPhlAn software. Boldface in the tree indicates the bins obtained in the present study. The averaged RNA expression level (RPKM in triplicate) of each bin is shown as a grayscale heatmap. The metabolic functions of each bin are shown as follows: closed circle, the bin has a complete gene set for each function, and corresponding RNAs were expressed; gray circle, the bin has a partial gene set for each function, and corresponding RNAs were expressed; open circle, although the bin has a complete or partial gene set for each function, corresponding RNAs were not expressed. Amino acids are shown as common three-letter abbreviations according to the International Union of Pure and Applied Chemistry (IUPAC). Other abbreviations: Sec, bacterial secretion system; Pyr, pyruvate; GCS, glycine cleavage system; GRD, glycine reductase; Put, putrescine; Spe, spermidine; SAM, S-adenosyl-l-methionine; Pot, ABC-type polyamine transporter; OpuA, osmotically regulated binding protein-dependent transport system for the osmoprotectant glycine betaine; LIV, branched-chain amino acid transport system; Fum, fumarate; Prop, propionate; BCFA, branched-chain fatty acid; Cyt, cytochrome; Nif, nitrogen fixation complex; ETF, electron transfer flavoprotein; Fix, ETF-oxidizing hydrogenase complex; Fe-S red, Fe-S reductase; Hdr-Flox, heterodisulphide reductase-flavin oxidoreductase complex, Rnf, Rhodobacter nitrogen fixation complex; Eb hyd, electron-bifurcating hydrogenase; Fd hyd, ferredoxin-dependent [NiFe]-hydrogenase; Hya, NADH/quinone-dependent [NiFe]-hydrogenase; Ech, energy-conserving hydrogenase; Mvh, methyl-viologen-reducing hydrogenase; Hox, bidirectional soluble hydrogenase; Eb fdh, electron-bifurcating formate dehydrogenase; Fdo, formate dehydrogenase O.