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The Gram-negative, strictly aerobic, non-motile, non-spore-forming, rod shaped bacterial strain designated TR6-03^T was isolated from compost, and its taxonomic position was investigated by using a polyphasic approach. Strain TR6-03^T grew at 4-42°C and at pH 6.0-8.0 on R2A and nutrient agar without NaCl supplement. Strain TR6-03^T had β-glucosidase activity, which was responsible for its ability to transform ginsenoside Re (one of the dominant active components of ginseng) to Rg_2. On the basis of 16S rRNA gene sequence similarity, strain TR6-03^T was shown to belong to the family Sphingobacteriaceae and to be related to Mucilaginibacter lappiensis ANJLI2^T (96.3% sequence similarity), M. dorajii FR-f4^T (96.1%),and M. rigui WPCB133^T (94.1%). The G+C content of the genomic DNA was 45.6%. The predominant respiratory quinone was MK-7 and the major fatty acids were summed feature 3 (comprising C_(16:1) ω7c and/or iso-C_(15:0) 2OH), iso-C_(15:0) and iso-C_(17:0) 3OH. DNA and chemotaxonomic data supported the affiliation of strain TR6-03^T to the genus Mucilaginibacter. Strain TR6-03^T could be differentiated genotypically and phenotypically from the recognized species of the genus Mucilaginibacter. The isolate therefore represents a novel species,for which the name Mucilaginibacter composti sp. nov. is proposed, with the type strain TR6-03^T (=KACC 14956^T =KCTC 12642^T =LMG 23497^T).