title: Marinilactibacillus piezotolerans sp. nov., a novel marine lactic acid bacterium isolated from deep sub-seafloor sediment of the Nankai Trough.
abstract: A piezotolerant, mesophilic, marine lactic acid bacterium (strain LT20T) was isolated from a deep sub-seafloor sediment core collected at Nankai Trough, off the coast of Japan. Cells were Gram-positive, rod-shaped, non-sporulating and non-motile. The NaCl concentration range for growth was 0-120 g l(-1), with the optimum at 10-20 g l(-1). The temperature range for growth at pH 7.0 was 4-50 degrees C, with the optimum at 37-40 degrees C. The optimum pH for growth was 7.0-8.0. The optimum pressure for growth was 0.1 MPa with tolerance up to 30 MPa. The main cellular phospholipids were phosphatidylglycerols (25 %), diphosphatidylglycerols (34 %) and a group of compounds tentatively identified as ammonium-containing phosphatidylserines (32 %); phosphatidylethanolamines (9 %) were minor components. The fatty acid composition was dominated by side chains of 16 : 0, 14 : 0 and 16 : 1. The G+C content of the genomic DNA was 42 mol%. On the basis of 16S rRNA gene sequence analysis and the secondary structure of the V6 region, this organism was found to belong to the genus Marinilactibacillus and was closely related to Marinilactibacillus psychrotolerans M13-2(T) (99 %), Marinilactibacillus sp. strain MJYP.25.24 (99 %) and Alkalibacterium olivapovliticus strain ww2-SN4C (97 %). Despite the high similarity between their 16S rRNA gene sequences (99 %), the DNA-DNA hybridization levels were less than 20 %. On the basis of physiological and genetic characteristics, it is proposed that this organism be classified as a novel species, Marinilactibacillus piezotolerans sp. nov. The type strain is LT20T (=DSM 16108T=JCM 12337T).
authors.affiliation: UMR 6539, Centre National de la Recherche Scientifique et Université de Bretagne Occidentale, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Toffin
authors.affiliation: GeoForschungsZentrumPotsdam (GFZ), Telegrafenberg, D-14473 Potsdam, Germany.
authors.forename: Klaus
authors.initials: K
authors.lastname: Zink
authors.affiliation: Extremobiosphere Research Centre, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan.
authors.forename: Chiaki
authors.initials: C
authors.lastname: Kato
authors.affiliation: Laboratoire de Microbiologie et de Biotechnologie des Extrêmophiles, Département de Valorisation des Produits, IFREMER, Centre de Brest, BP 70, F-29280 Plouzané, France.
authors.forename: Patricia
authors.initials: P
authors.lastname: Pignet
authors.affiliation: UMR 6539, Centre National de la Recherche Scientifique et Université de Bretagne Occidentale, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France.
authors.forename: Adeline
authors.initials: A
authors.lastname: Bidault
authors.affiliation: UMR 6539, Centre National de la Recherche Scientifique et Université de Bretagne Occidentale, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France.
authors.forename: Nadège
authors.initials: N
authors.lastname: Bienvenu
authors.affiliation: UMR 6539, Centre National de la Recherche Scientifique et Université de Bretagne Occidentale, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France.
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Birrien
authors.affiliation: UMR 6539, Centre National de la Recherche Scientifique et Université de Bretagne Occidentale, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France.
authors.forename: Daniel
authors.initials: D
authors.lastname: Prieur
mesh_terms: D015373:Bacterial Typing Techniques; D004269:DNA, Bacterial / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D020459:Genes, rRNA; D019015:Geologic Sediments / Q000382:microbiology*; D006093:Gram-Positive Asporogenous Rods / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology; D006874:Hydrostatic Pressure; D007564:Japan; D019344:Lactic Acid / Q000378:metabolism*; D008969:Molecular Sequence Data; D010641:Phenotype; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012623:Seawater / Q000382:microbiology*; D017422:Sequence Analysis, DNA
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D019344:Lactic Acid