Monashia Flava Gen. Nov., Sp. Nov., an Actinobacterium of the Family Intrasporangiaceae

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Monashia Flava Gen. Nov., Sp. Nov., an Actinobacterium of the Family Intrasporangiaceae International Journal of Systematic and Evolutionary Microbiology (2016), 66, 554–561 DOI 10.1099/ijsem.0.000753 Monashia flava gen. nov., sp. nov., an actinobacterium of the family Intrasporangiaceae Adzzie-Shazleen Azman,1 Nurullhudda Zainal,1,2 Nurul-Syakima Ab Mutalib,3 Wai-Fong Yin,2 Kok-Gan Chan2 and Learn-Han Lee1 Correspondence 1Biomedical Research Laboratory, Jeffrey Cheah School of Medicine and Health Sciences, Learn-Han Lee Monash University Malaysia, 46150 Bandar Sunway, Selangor Darul Ehsan, Malaysia [email protected] or 2Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, [email protected] University of Malaya, 50603 Kuala Lumpur, Malaysia 3UKM Medical Molecular Biology Institute (UMBI), UKM Medical Centre, Bandar Tun Razak, 56000 Cheras, Kuala Lumpur, Malaysia A novel actinobacterial strain, MUSC 78T, was isolated from a mangrove soil collected from Peninsular Malaysia. The taxonomic status of this strain was determined using a polyphasic approach. Comparative 16S rRNA gene sequence analysis revealed that strain MUSC 78T represented a novel lineage within the class Actinobacteria. Strain MUSC 78T formed a distinct clade in the family Intrasporangiaceae and was related most closely to members of the genera Terrabacter (98.3–96.8 % 16S rRNA gene sequence similarity), Intrasporangium (98.2– 96.8 %), Humibacillus (97.2 %), Janibacter (97.0–95.3 %), Terracoccus (96.8 %), Kribbia (96.6 %), Phycicoccus (96.2–94.7 %), Knoellia (96.1–94.8 %), Tetrasphaera (96.0–94.9 %) and Lapillicoccus (95.9 %). Cells were irregular rod-shaped or cocci and stained Gram- positive. The cell-wall peptidoglycan type was A3c, with LL-diaminopimelic acid as the diagnostic diamino acid. The main cell-wall sugar was mannose and lower amounts of galactose and rhamnose were present. The predominant menaquinone was MK-8(H4). The polar lipid profile consisted of phosphatidylglycerol, phosphatidylinositol, phosphatidylethanolamine, diphosphatidylglycerol and phosphoglycolipid. The predominant fatty acids were iso-C15 : 0, anteiso-C15 : 0 and iso-C16 : 0.The DNA G+C content was 73.1 mol%. Based on this polyphasic study, MUSC 78T exhibited phylogenetic and phenotypic differences from members of the genera of the family Intrasporangiaceae, and therefore a novel species of a new genus, Monashia flava gen. nov., sp. nov., is proposed. The type strain of Monashia flava is MUSC 78T (5DSM 29621T5MCCC 1K00454T5NBRC 110749T). The family Intrasporangiaceae (Stackebrandt et al., 1997; Intrasporangiaceae contained 19 genera, including 16 Stackebrandt & Schumann, 2000) was redescribed by genera summarized by Zhi et al. (2009) and the recently Zhi et al. (2009) and the family contains an array of acti- described Marihabitans (Kageyama et al., 2008b), Fodini- nobacteria, in addition to the type genus Intrasporangium bacter (Wang et al., 2009) and Ornithinibacter (Xiao et al., (Kalakoutskii et al., 1967), and has MK-8(H4)orMK-8as 2011). It is possible to distinguish these genera from each the major menaquinones and LL-diaminopimelic acid (LL- other on the basis of phenotypic and genotypic character- DAP), meso-DAP or L-ornithine (L-Orn) in the cell-wall istics. The present investigation was designed to deter- peptidoglycan (Martin et al., 1997; Maszenan et al., mine the taxonomic status of a novel actinobacterial T 2000; Groth et al., 2001, 2002; Hanada et al., 2002; strain, MUSC 78 ,thatcontainedLL-DAP in the cell- Kageyama et al., 2005, 2007, 2008a, b; Jung et al., 2006; wall peptidoglycan and MK-8(H4)asthepredominant Lee & Lee, 2007). At the time of writing, the family menaquinone. To determine the taxonomic position of strain MUSC 78T, a polyphasic approach was used to Abbreviation: DAP, diaminopimelic acid. determine the phylogenetic, chemotaxonomic and pheno- typic characteristics of the novel strain. The results indi- The GenBank/EMBL/DDBJ accession number of the 16S rRNA gene T sequence of strain MUSC 78T is KF682157. cated that strain MUSC 78 represents a novel species Two supplementary figures are available with the online Supplementary of a new genus, for which the name Monashia flavus Material. gen. nov., sp. nov. is proposed. 554 000753 G 2015 IUMS Printed in Great Britain Monashia flava gen. nov., sp. nov. Strain MUSC 78T was isolated from a soil sample collected assays were determined using Biolog GenIII MicroPlates at site MUSC-TLS1 (38 489 3.20 N 1038 209 11.00 E), according to the manufacturer’s instructions (Biolog). located at the mangrove forests of the Tanjung Lumpur Biomass for molecular systematic studies and freeze-dried in the state of Pahang, Peninsular Malaysia, in December cells for chemotaxonomic studies was obtained after grow- 2012. Samples of the upper 20 cm topsoil layer (after ing in TSB at 28 8C for 5 days on a rotary shaker. Analysis removing the top 2–3 cm) were collected using an aseptic of peptidoglycan amino-acid composition and sugars was metal trowel, placed in sterile plastic bags and stored in carried out by the Identification Service of the DSMZ 220 8C. Selective pretreatment of soil samples was per- (Braunschweig, Germany). The analyses were performed formed using wet heat in sterilized water (15 min at according to published protocols (Schumann, 2011). 50 8C; Takahashi et al., 1996). Five grams of air-dried Major diagnostic sugars of strain MUSC 78T were obtained soil was mixed with 45 ml sterilized water and ground following the procedure described by Whiton et al. (1985) using a mill and then the suspension was spread onto a and analysed by TLC on cellulose plates according to Sta- selective isolation medium, starch casein agar (SCA; neck & Roberts (1974). Analysis of respiratory menaqui- Ku¨ster & Williams, 1964) supplemented with cyclohexi- 2 2 nones and polar lipids was carried out by the mide (25 mgml 1) and nystatin (10 mgml 1), and incu- Identification Service of the DSMZ. The cellular polar bated at 28 8C for 7 days. Isolate MUSC 78T was lipids were extracted and analysed by TLC (Kates, 1986). maintained on R2A agar medium at 28 8C and as glycerol Cellular fatty acid analyses of strain MUSC 78T were car- suspensions (20 %, v/v) at 220 8C. ried out by the Identification Service of the DSMZ. Cell Cultural characteristics of strain MUSC 78T were deter- mass of strain MUSC 78T was harvested from TSB after mined following growth on ISP 2 and ISP 7 media (Shirling incubation at 28 8C for 5 days. The fatty acids were & Gottlieb, 1966), SCA, Streptomyces agar (SA; Atlas 1993), extracted and prepared according to the standard protocol Actinomycetes isolation agar (AIA; Atlas 1993) and nutrient of the MIDI Microbial Identification system (Sasser, 1990). agar (MacFaddin, 2000) for 7 days at 28 8C. The ISCC-NBS Genomic DNA extractions were carried out as described by colour charts were used to determine the names and desig- Hong et al. (2009). PCR amplification of the 16S rRNA nations of colony colours (Kelly, 1964). Light microscopy gene and sequencing of the purified products were done as (80i; Nikon) and scanning electron microscopy (JEOL- described by Lee et al. (2014b). The 16S rRNA gene sequence JSM 6400) were used to observe the morphologies of strains of strain MUSC 78T was aligned with sequences of closely after incubation on R2A agar medium at 28 8C for 7 days. related type genera classified in the family Intrasporangiaceae Gram staining was done following the standard Gram reac- that had been retrieved from the GenBank/EMBL/DDBJ tion and was confirmed by using KOH lysis (Cerny, 1978). databases using CLUSTAL X software (Thompson et al., Growth was tested at 4–44 8C at intervals of 4 8C on R2A 1997). The alignment was manually verified and adjusted agar medium. NaCl tolerance was tested using trypticase prior to the reconstruction of a phylogenetic tree. Phyloge- soy broth (TSB) and salt concentrations of 0–14 % (w/v) netic trees were reconstructed using the neighbour-joining at intervals of 2 %. Growth was tested between pH 4.0 and (Saitou & Nei, 1987) and maximum-likelihood (Felsenstein, 10.0 at intervals of 1 pH unit. The production of melanoid 1981) algorithms with MEGA version 6.0 (Tamura et al., pigments and catalase activity were assessed following the 2013). Calculations of levels of sequence similarity were car- protocols described by Lee et al. (2014a). Haemolytic ried out using the EzTaxon-e server (http://eztaxon-e. activity was assessed on blood agar medium containing ezbiocloud.net/; Kim et al., 2012). The stability of the resul- 5 % (w/v) peptone, 3 % (w/v) yeast extract, 5 % (w/v) tant tree topologies was evaluated by using the bootstrap NaCl and 5 % (v/v) horse blood (Carrillo et al., 1996). resampling method of Felsenstein (1985). Evolutionary dis- Plates were examined for haemolysis after incubation at tances were computed using Kimura’s two-parameter model 32 8C for 7 days. Lipase, amylase, cellulase, chitinase, pro- (Kimura, 1980). The genomic DNA of strain MUSC 78T for tease and xylanase activities were determined by growing the determination of G+C content was extracted according cells on R2A agar medium and following the protocols to Cashion et al. (1977). The G+C content of the DNA was described by Meena et al. (2013). The presence of clear determined by HPLC (Mesbah et al., 1989). zones around colonies signifies the potential of isolates for surfactant production. Antibiotic susceptibility tests were Strain MUSC 78T formed Gram-stain-positive, non-motile, performed by the disc diffusion method as described by aerobic, non-spore-forming cocci or irregular rod-shaped Shieh et al. (2003). Antimicrobials (Oxoid) used were as fol- cells (Fig. 1). Cells formed yellowish-white-pigmented lows: ampicillin (10 mg), ampicillin sulbactam (30 mg), colonies on ISP 2 medium and AIA. Good growth was cefotaxime (30 mg), cefuroxime (30 mg), cephalosporin observed on R2A agar medium, ISP 2 medium, ISP 7 (30 mg), chloramphenicol (30 mg), ciprofloxacin (10 mg), medium, Luria–Bertani agar, nutrient agar and SA after erythromycin (15 mg), gentamicin (20 mg), nalidixic acid 7 days at 28 8C, while cells grew moderately on AIA and (30 mg), penicillin G (10 mg), streptomycin (10 mg), tetra- SCA.
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