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Torrey 1916) Johnson and Cummins 1972, 1057AL As Propionimicrobium Lymphophilum Comb International Journal of Systematic and Evolutionary Microbiology (2002), 52, 1925–1927 DOI: 10.1099/ijs.0.02188-0 Propionimicrobium gen. nov., a new genus to NOTE accommodate Propionibacterium lymphophilum (Torrey 1916) Johnson and Cummins 1972, 1057AL as Propionimicrobium lymphophilum comb. nov. 1 DSMZ–Deutsche Sammlung Erko Stackebrandt,1,2 Peter Schumann,1 Klaus P. Schaal3 and von Mikroorganismen und 1 Zellkulturen GmbH, Norbert Weiss Mascheroder Weg 1b, D-38124 Braunschweig, Germany Author for correspondence: Erko Stackebrandt. Tel: j49 531 2616 352. Fax: j49 531 2616 418. e-mail: erko!dsmz.de 2 Institut fu$ r Mikrobiologie, Technische Universita$ t Carolo-Wilhelmina, Braunschweig, Germany Based upon significant differences in chemotaxonomic properties, i.e., amino acid composition of peptidoglycan, fatty acids and base composition of DNA, 3 Institut fu$ r Medizinische Mikrobiologie und and supported by the phylogenetic position of the 16S rDNA sequence the Immunologie, Rheinische species Propionibacterium lymphophilum was reclassified as Friedrich-Wilhelms- Propionimicrobium lymphophilum comb. nov. Universita$ t, Bonn, Germany Keywords: Propionibacterium, Propionimicrobium gen. nov., Propionimicrobium lymphophilum comb. nov. Originally described as ‘Bacillus lymphophilus’ (Torrey strain investigated. According to the Technical Ser- 1916), ‘Corynebacterium lymphophilum’ (Torrey 1916) vices of ATCC in August 2001, strain ATCC 27520T Eberson 1918 and ‘Mycobacterium lymphophilum’ was originally received as strain VIP 7625BT. (Torrey 1916) Krasil’nikov 1949, strain VIP 0202 was T In order to determine whether strain VIP7625B (l included in a taxonomic study on coryneforms and T T ATCC 27520 l DSM 4309 ) is a subculture of VIP propionibacteria by Johnson & Cummins (1972). 0202, we reinvestigated two of the salient characters of Based upon low DNA reassociation with members of strain DSM 4309T, originally obtained for strain VIP Corynebacterium, anaerobic growth and the formation 0202, i.e. base composition of DNA and cell wall of propionic acid, this strain was tentatively classified composition. Johnson & Cummins (1972) found lysine as Propionibacterium lymphophilum. Skerman et al. instead of diaminopimelic acid (A#pm) as the dicar- (1980) included Propionibacterium lymphophilum in boxylic amino acid of the peptidoglycan. A#pm is the the Approved Lists of Bacterial Names, referring to diagnostic amino acid of Propionibacterium species the publication of Johnson & Cummins (1972) and to other than Propionibacterium lymphophilum. Using the a description by Holdeman et al. (1977). The Anaerobe methods of Schleifer & Kandler (1972), we confirm the Laboratory Manual of the Virginia Polytechnic In- presence of lysine and demonstrate the peptidoglycan stitute and State University, Blacksburg, VA, USA type to be A4α (Lys-Asp), in which aspartic acid forms (VIP), however, only lists physiological and mor- the interpeptide bridge. We also confirm the rather low phological properties but gives no formal description. GjC content of the DNA. Using the method of This was followed in 1986 (Cummins & Johnson, 1986) Mesbah et al. (1989), the DSMZ culture has a DNA by the coverage of the genus Propionibacterium in base composition of 56 mol% GjC, which is slightly Bergey’s Manual of Systematic Bacteriology. Both higher than the 53–54 mol% reported for VIP 202. Holdeman et al. (1977) and Skerman et al. (1980) Investigation of the principal isoprenoid quinone indicated strain VIP 7625BT ( ATCC 27520T) as the l (Collins et al., 1977) revealed MK-9(H%), which is type strain, but neither Johnson & Cummins (1972), present in all members of the family Propionibac- Holdeman et al. (1977) nor Cummins & Johnson teriaceae. Major fatty acids, determined according to (1986) refer to VIP 7625BT but to VIP 0202 as the the methods of Miller & Berger (1984), are C"):"ω9c (30%), anteiso-C"&:! (29%) and C"':! (15%); smaller ................................................................................................................................................. components (" 2to! 5%) are C"%:!,i-C"&:!, ai-C"(:! Published online ahead of print on 11 April 2002 as DOI 10.1099/ and C"):"ω7c. This composition differs significantly ijs.0.02188-0. from those reported for Propionibacterium strains, in 02188 # 2002 IUMS Printed in Great Britain 1925 E. Stackebrandt and others family Propionibacteriaceae (Stackebrandt et al., 1997), e.g. Propionibacterium cyclohexanicum (Kusano et al., 1997) and Propionibacterium microaerophilum (Kousse! mon et al., 2001), Microlunatus phosphovorus (Nakamura et al., 1995), the two species of Luteococcus (Tamura et al., 1994; Collins et al., 2000), Tessara- coccus bendigoensis (Maszenan et al., 1999b), Micro- pruina glycogenica (Shintani et al., 2000) as well as the four species of Friedmanniella (Lawson et al., 2000; Schumann et al., 1997; Maszenan et al., 1999a). We thus conclude, on the basis of distinct phylogenetic position in combination with the significant differences in peptidoglycan composition in which Propioni- bacterium lymphophilum differs from the other mem- ................................................................................................................................................. bers of Propionibacterium, that a new genus is warrant- Fig. 1. Distance matrix tree (De Soete, 1983), displaying the ed to accommodate Propionibacterium lymphophilum. phylogenetic position of Propionibacterium lymphophilum DSM T We therefore propose the generic name Propioni- 4903 , described as Propionimicrobium lymphophilum in this microbium gen. nov. and the species Propionimicrobium study, within the radiation of some members of the family Propionibacteriaceae. Numbers within the dendrogram indicate lymphophilum comb. nov. for this organism. Physiolo- the percentages of occurrence of the branching order in 200 gically this species can be differentiated from members bootstrapped trees (only values of 80% and above are shown). of Propionibacterium by a combination of results from Bar, 2 nucleotide changes per 100 nucleotides. aesculin hydrolysis, indole production and nitrate reduction, as well as by a combination of acid production from -sorbose, adonitol, erythritol, malt- which either branched fatty acids (Moss et al., 1969) or ose and ribose (Kusano et al., 1997; Kousse! mon et al., ω-cyclohexane (Kusano et al., 1997) dominate. 2001). The description of this species is based on two strains, Description of Propionimicrobium gen. nov. VIP 0202 and VIP 0383, which show 75% DNA similarity to one another. Two additional strains Propionimicrobium (Pro.pi.on.i.mi.crohbi.um. N.L. n. shared 100% DNA similarity with strain VIP 0202 acidum propionicum propionic acid; Gr. adj. micros and also show cross-agglutination and precipitation small; Gr. masc. n. bios life. N.L. neut. n. Propioni- with it (cited by Cummins & Johnson, 1972). In their microbium propionic acid-producing microbe). coverage of the species Propionibacterium lympho- philum in Bergey’s Manual of Systematic Bacteriology The description is based on data of Holdeman et al. (1986), Cummins & Johnson state ‘In view of this (1977), Cummins & Johnson (1986), 16S rDNA data [referring to chemotaxonomic properties] and the of Dasen et al. (1998) and our own data. Pleomorphic small number of strains, the status and taxonomic rods, 0n5–0n8 µm in diameteri1–2n5 µm in length, position of this organism must remain somewhat often diphtheroid or club-shaped. Cells may be coc- provisional until more strains are collected and ex- coid. Cells may occur singly, in pairs or short chains, in amined’. A combination of chemotaxonomic distinct- V or Y configurations or in clumps. Gram-positive, ness and phylogenetic position, based upon compara- non-motile, non-sporeforming chemo-organotrophs. tive sequence analysis of 16S rDNA, has been the main Anaerobic. Fermentation end products include pro- basis for the description of novel genera in the past pionic acid, acetic acid, succinic acid, iso-valeric acid decade. Propionibacterium lymphophilum DSM 4309T and lesser amounts of formic acid. One out of two strains is catalase-positive. The major menaquinone shares less than 91n8% sequence similarity with the other Propionibacterium species (Dasen et al., 1998) type is MK-9(H%). The peptidoglycan contains lysine which themselves show more than 93% similarity and aspartic acid (Lys-Asp type). Major fatty acids are C ω9c, anteiso-C and C . The G C content of among each other. Depending upon the algorithm "):" "&:! "':! j used, analysis of the 16S rDNA indicates Propionibac- the DNA is 53–54 mol% (Tm) or 56 mol% (HPLC of terium lymphophilum to form either the deepest branch digested DNA). Based upon 16S rDNA analysis a of the genus (Kousse! mon et al., 2001; member of the family Propionibacteriaceae. Type program [Felsenstein, 1993]), or to branch even among species: Propionimicrobium lymphophilum (Torrey the other genera of Propionibacteriaceae (this study, 1919) Johnson & Cummins 1972. based upon maximum-likelihood [Felsenstein, 1993] or distance matrix analyses [De Soete, 1983], Fig. 1). Description of Propionimicrobium lymphophilum (Torrey 1919) Johnson and Cummins 1972 comb. nov. Although the availability of more than a single strain is the basis for unravelling the metabolic potential of a Propionimicrobium lymphophilum (lym.phohphi.lum. species, hardly more than two strains have been L. fem. n. lympha clear water, lymph; Gr. adj. philos included in the description of recent species of the
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