title: Characteristics of Mycobacterium smegmatis J15cs strain lipids.
abstract: Mycobacterium smegmatis is a rapidly growing, non-pathogenic mycobacterium, and M. smegmatis strain mc(2)155 in particular has been used as a tool for molecular analysis of mycobacteria because of its high rate of transformation. We examined another strain, M. smegmatis J15cs, which has the advantage of surviving for six days in murine macrophages. The J15cs strain produces a rough dry colony, and we hypothesized that the long survival of the J15cs strain was correlated with its cell wall components. Therefore, the lipid compositions of these two strains were compared. The subclasses and carbon species of the mycolic acids were very similar, and the major glycolipids and phospholipids were expressed in both strains. However, apolar glycopeptidolipids were deleted only in the J15cs strain. The presence of apolar glycopeptidolipids gives the cell wall a different structure. Moreover, the apolar glycopeptidolipids were recognized by macrophages via toll-like receptor 2, but not 4. We concluded that the absence of apolar glycopeptidolipids is a definitive feature of the J15cs strain, and affects its morphology and survival in host cells.
authors: Department of Bacteriology, Osaka City University Graduate School of Medicine, 1-4-3 Asahi-machi, Abeno-ku, Osaka 545-8585, Japan. fujiwara@med.osaka-cu.ac.jp
authors: Nagatoshi
authors: N
authors: Fujiwara
authors: Takashi
authors: T
authors: Naka
authors: Midori
authors: M
authors: Ogawa
authors: Reina
authors: R
authors: Yamamoto
authors: Hisashi
authors: H
authors: Ogura
authors: Hatsumi
authors: H
authors: Taniguchi
mesh_terms: D000818:Animals; D002473:Cell Wall / Q000737:chemistry; D002478:Cells, Cultured; D006017:Glycolipids / Q000032:analysis; D006801:Humans; D008055:Lipids / Q000032:analysis*; D008262:Macrophage Activation / Q000502:physiology; D008264:Macrophages / Q000382:microbiology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D020102:Mycobacterium smegmatis / Q000737:chemistry* / Q000145:classification / Q000254:growth & development; D009171:Mycolic Acids / Q000032:analysis; D010743:Phospholipids / Q000032:analysis; D051195:Toll-Like Receptor 2 / Q000502:physiology; D051197:Toll-Like Receptor 4 / Q000502:physiology
chemical_list: D006017:Glycolipids; D008055:Lipids; D009171:Mycolic Acids; D010743:Phospholipids; C495342:TLR2 protein, human; C495345:TLR4 protein, human; D051195:Toll-Like Receptor 2; D051197:Toll-Like Receptor 4