A new genus, , and one new species are described for a group of restricted facultatively methylotrophic bacteria. Five strains belonging to the new genus are characterized by a low level (5 to 15%) of DNA-DNA homology with type strains of restricted facultative methylobacteria of the genus NCIB 10515) and obligate methylobacteria of the genus ATCC 29475). The strains, like and strains, assimilate methanol via the ribulose monophosphate pathway and do not have α-ketoglutarate dehydrogenase and glyoxylate bypass enzymes. strains are characterized by an enhanced specificity of 6-phosphogluconate-dehydrogenase to NAD (not NADP) the absence of glutamate dehydrogenase, and the presence of the glutamate cycle enzymes for ammonia assimilation. The deoxyribonucleic acid base composition of the strains is 56 to 57 mol% guanine plus cytosine. Their phospholipids are similar to those of but differ from those of by the occurrence of diphosphatidylglycerol. The fatty acid composition of the strains of all three genera is primarily C and C, although the , but not , strains also contain two unidentified C branched fatty acids. The type species is sp. nov. The type strain is 6B1 (= UCM B-1475).


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