A novel marine bacterial strain, PV-4 T , isolated from a microbial mat located at a hydrothermal vent of Loihi Seamount in the Pacific Ocean, has been characterized. This micro-organism is orangey in colour, Gram-negative, polarly flagellated, facultatively anaerobic and psychrotolerant (temperature range, 0-42 6C). No growth was observed with nitrate, nitrite, DMSO or thiosulfate as the electron acceptor and lactate as the electron donor. The major fatty acid detected in strain PV-4 T was iso-C 15 : 0 . Strain PV-4 T had ubiquinones consisting mainly of Q-7 and Q-8, and possessed menaquinone MK-7. The DNA G+C content of the strain was 53?8 mol% and the genome size was about 4?5 Mbp. Phylogenetic analyses based on 16S rRNA gene sequences placed PV-4 T within the genus Shewanella. PV-4 T exhibited 16S rRNA gene sequence similarity levels of 99?6 and 97?5 %, respectively, with respect to the type strains of Shewanella aquimarina and Shewanella marisflavi. DNA from strain PV-4 T showed low mean levels of relatedness to the DNAs of S. aquimarina (50?5 %) and S. marisflavi (8?5 %). On the basis of phylogenetic and phenotypic characteristics, the bacterium was classified in the genus Shewanella within a distinct novel species, for which the name Shewanella loihica sp. nov. is proposed. The type strain is PV-4 T (=ATCC BAA-1088 T =DSM 17748 T ).The genus Shewanella consists of rod-shaped, Gramnegative, facultatively anaerobic, readily cultivated gammaproteobacteria (Gauthier et al., 1995;MacDonell & Colwell, 1985;Venkateswaran et al., 1999). While many Shewanella strains remain uncharacterized, there are 32 recognized Shewanella species: the latter were isolated from a variety of sources, primarily aquatic environments and sediments (Bowman et al., 1997;Bozal et al., 2002;Brettar et al., 2002;Coyne et al., 1989;Ivanova et al., 2001 Ivanova et al., , 2003a Ivanova et al., , b, 2004aLeonardo et al., 1999;Makemson et al., 1997;Nogi et al., 1998;Nozue et al., 1992;Satomi et al., 2003Satomi et al., , 2006Skerratt et al., 2002; Toffin et al., 2004;Venkateswaran et al., 1998Venkateswaran et al., , 1999Xu et al., 2005; Yoon et al., 2004a, b;Zhao et al., 2005Zhao et al., , 2006Ziemke et al., 1998). The bacteria of this genus have attracted great attention because of their diverse respiratory capacities, illustrated by their ability to utilize a wide range of terminal electron acceptors, including oxygen, nitrate, metals and sulfur compounds (Kostka et al., 1996;Myers & Nealson, 1988;Venkateswaran et al., 1999; http://www. shewanella.org). Some Shewanella strains are also able to degrade pollutants such as chlorinated solvents (Petrovskis et al., 1994), petroleum (Semple & Westlake, 1987) and RDX (1,3,5-trinitroperhydro-1,3,5-triazine) (Zhao et al., 2004), some can produce polyunsaturated fatty acids (Bowman et al., 1997;Russell & Nichols, 1999;Satomi et al., 2003) and some are able to grow under extreme conditions (Bozal et al., 2002;Kato et al., 1998;Nogi et al., 1998;Stapleton et al., 2005).In a previous study, several She...
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