Coriobacteriia Konig 2013
General information
Description and emendation
The class is formed by elevation of the subclass Coriobacteridae. The subclass Coriobacteridae was circumscribed on the basis of phylogenetic analysis of the 16S rRNA gene sequences (Figure 1). The 16S rDNA/rRNA signature pattern is as that of the family Coriobacteriaceae.
1: The class contains the type order Coriobacteriales. The species from this class are Gram-stain positive rods or cocci that occur singly or in pairs. They do not form spores. All members, except for members of the genus Gordonibacter, do not possess flagella. Organisms within the class are strictly or facultatively anaerobic and may or may not ferment sugars. The DNA G+C content for members of the class ranges from 35 mol% to 67 mol%. This class of bacteria can be distinguished from all other species of the phylum Actinobacteria by the conserved signature indels described in this report in the following proteins: transcription termination factor NusA, methionine adenosyltransferase, adenylate kinase, DNA polymerase III subunit e, RNA-metabolizing metallo-β-lactamase, leucyl-tRNA synthetase, S-adenosyl-methyltransferase MraW, pyruvate phosphate dikinase, RluA family pseudouridine synthase, Obg family GTPase CgtA, protein translocase subunit secA, tRNA-dihydrouridine synthase B, 1-hydroxy-2-methyl-2-(E)-butenyl 4-diphosphate synthase, hypothetical protein COLAER_00981, GTP-binding protein HflX, histidyl-tRNA synthetase, type II/IV secretion system protein, type II secretion system protein E, Ribosomal protein S9, tRNA dimethylallyltransferase and hypothetical protein AvagD15_00561. Some signature nucleotides in the 16S rRNA that appear to be specific for this class of bacteria have also been described (base positions relative to Escherichia coli) 242:284 (C-G), 291:309 (C-G), 316:337 (U-G), 819 (A), 952:1229 (U-A) and 1115:1185 (C-G).