Abstract
The species Arthrobacterendophyticus is phylogenetically placed within the Glutamicibacter clade and shares 97.3-98.4 % 16S rRNA gene sequence similarities with the species of this genus. The quinone system with the major menaquinone MK-9 and the peptidoglycan amino acids alanine, glutamic acid and lysine are consistent with the characteristics of the members of the genus Glutamicibacter but the polar lipid profile with phosphatidylinositol distinguishes A. endophyticus from species of the genus Glutamicibacter. Re-analysis of both peptidoglycan structure and polar lipid profile revealed peptidoglycan type l-Lys-l-Ala-l-Glu (A11.35) and a polar lipid profile lacking phosphatidylinositol. These traits are consistent with those of representatives of the genus Glutamicibacter and distinguish A. endophyticus from members of the genus Arthrobacter sensu stricto. Due to its phylogenetic position and congruence with the key characteristics of members of the genus Glutamicibacter we here propose the reclassification of Arthrobacter endophyticus as a species of the genus Glutamicibacter, Glutamicibacter endophyticus comb. nov. (EGI 6500322T=DSM 28750T=KCTC 29490T=JCM 30091T).
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