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Microbacterium luticocti sp. nov., isolated from sewage sludge compost

¹ Escola Superior de Biotecnologia, Universidade Católica Portuguesa, 4200-072 Porto, Portugal
² LEPAE – Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal
³ Culture Collection University Göteborg, Department of Clinical Bacteriology, S-41346 Göteborg, Sweden
⁴ DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstraße 7B, D-38124 Braunschweig, Germany

Correspondence
Célia M. Manaia
cmmanaia{at}esb.ucp.pt

Strain SC-087B^T, isolated from sewage sludge compost during a study of bacterial diversity in composts, was characterized. The isolate was a Gram-positive, short rod that was motile, catalase- and oxidase-negative and able to grow at 27–45 °C, pH 5.5–9.7 and in up to 10 % NaCl. The peptidoglycan was of the B2β type, containing the characteristic amino acids ornithine, homoserine and hydroxyglutamic acid. The muramic acid residues of the peptidoglycan were partially glycolylated. The major cell-wall sugar was mannose; traces of xylose were also detected. The predominant fatty acids, comprising more than 70 % of the total, were anteiso-C_{17 : 0} and anteiso-C_{15 : 0}, the major respiratory quinone was menaquinone-12 (MK-12) and the G+C content of the genomic DNA was 72 mol%. Based on analysis of the 16S rRNA gene sequence, the closest phylogenetic neighbours of strain SC-087B^T were members of the family Microbacteriaceae, showing sequence similarity values of around 96 % with members of the species Microbacterium barkeri (96.0 %), Microbacterium gubbeenense (95.6 %) and Microbacterium indicum (95.7 %). The chemotaxonomic and phenotypic traits analysed supported the inclusion of this strain within the genus Microbacterium and the proposal of a novel species. The name Microbacterium luticocti sp. nov. is proposed and the type strain is SC-087B^T (=DSM 19459^T=CCUG 54537^T).