Herbiconiux moechotypicola sp. nov., a xylanolytic bacterium isolated from the gut of hairy long-horned toad beetles, Moechotypa diphysis (Pascoe)

Abstract

A novel Gram-positive, non-motile, rod-shaped bacterium, designated strain RB-62(T), was isolated during a study of culturable bacteria from the gut of Moechotypa diphysis (Pascoe) and its taxonomic position was investigated. Strain RB-62(T) grew at 15-30 °C and pH 5.0-8.5. The isoprenoid quinones were menaquinones MK-11 (77.1%), MK-10 (11.7%) and MK-12 (11.2%). The major cellular fatty acids were anteiso-C(15:0) (34.6%), anteiso-C(17:0) (29.8%), iso-C(16:0) (17.0%) and cyclohexyl-C(17:0) (11.4%). The diagnostic diamino acid of the cell-wall peptidoglycan was 2,4-diaminobutyric acid. The G+C content of the genomic DNA of strain RB-62(T) was 70.3 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain RB-62(T) was affiliated with the genus Herbiconiux cluster within the family Microbacteriaceae, and was related most closely to Herbiconiux ginsengi wged11(T) (98.08% similarity). The level of DNA-DNA relatedness between strain RB-62(T) and H. ginsengi wged11(T) was 43.2% (reciprocal 66.7%). Phenotypic and phylogenetic characteristics clearly distinguished strain RB-62(T) from recognized species of the genus Herbiconiux. Based on data from the present polyphasic study, strain RB-62(T) is considered to represent a novel species of the genus Herbiconiux, for which the name Herbiconiux moechotypicola sp. nov. is proposed. The type strain is RB-62(T) (=KCTC 19653(T)=JCM 16117(T)).