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1 Institut für Mikrobiologie und Genetik, Universität Wien, A-1030 Vienna, Austria
2 Department of Biology and Geology, University of South Carolina Aiken, Aiken, SC, USA
3 Institut für Bakteriologie, Mykologie und Hygiene, Veterinärmedizinische Universität, A-1210 Vienna, Austria
4 DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Braunschweig, Germany
5 Institut für Zoologie, Abteilung Ultrastrukturforschung, Universität Wien, A-1090 Wien, Austria
6 Department of Microbiology and Molecular Medicine, Clemson University, Clemson, SC 29634, USA
7 Department of Biological Sciences, Florida International University, Miami, FL 33199, USA
Correspondence
Ewald B. M. Denner
ewald.denner{at}univie.ac.at
A bacterium previously isolated from a diseased colony of the scleractinian coral Dichocoenia stokesi (common name elliptical star coral) was subjected to a detailed polyphasic taxonomic characterization. The isolate, designated WP1T, was halophilic and strictly aerobic and formed golden-orange-pigmented colonies after prolonged incubation. Cells of WP1T were Gram-negative, rod-shaped and showed a characteristic branching rod morphology. Chemotaxonomically, WP1T was characterized by having Q-10 as the major respiratory lipoquinone and sym-homospermidine as the main component of the cellular polyamine content. The predominant constituent in the cellular fatty acid profile was C18 : 1
7c, along with C19 : 0 cyclo 8c and C16 : 0. Other fatty acids present in smaller amounts were C17 : 0, C18 : 0, C16 : 17c, C20 : 17c and C18 : 1 2-OH. The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol and phosphatidylcholine. Minor amounts of diphosphatidylglycerol, phosphatidylmonomethylethanolamine and phosphatidyldimethylethanolamine were present. The G+C content of the genomic DNA was 66·3 mol%. Phylogenetic analysis of the 16S rRNA gene sequence showed that WP1T represents a separate subline of descent within the order ‘Rhizobiales’ of the ‘Alphaproteobacteria’. The new line of descent falls within the group of families that includes the Rhizobiaceae, Bartonellaceae, Brucellaceae and ‘Phyllobacteriaceae’, with no particular relative within this group. The 16S rRNA gene sequence similarity to all established taxa within this group was not higher than 92·0 % (to Mesorhizobium mediterraneum). To accommodate this emerging coral pathogen, the creation of a new genus and species is proposed, Aurantimonas coralicida gen. nov., sp. nov. (type strain WP1T=CIP 107386T =DSM 14790T).
Published online ahead of print on 13 December 2002 as DOI 10.1099/ijs.0.02359-0.
The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Aurantimonas coralicida strain WP1T is AJ065627.
Present address: Marine Biomedicine and Environmental Sciences, Medical University of South Carolina, Charleston, SC 29412, USA.
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