Journal: PLOS Pathogens
Article Title: Peptidoglycan architecture dictates protein interactions, tissue tropism, and arthritis in the Lyme disease spirochete Borrelia burgdorferi
doi: 10.1371/journal.ppat.1013849
Figure Lengend Snippet: (A) Schematic of the putative bb0605 operon, as well as the downstream bb0608 locus, mapped from the B. burgdorferi B31 type strain genome. The transposon integration site (+300, 5’ to 3’) in bb0605 is shown (triangle) as are the length, and location, of predicted non-coding regions. (B) Relative mRNA levels of target loci to validate B31-5A3/ bb0605 mutant. RT-PCR was performed on RNA isolated from both parental (B31-5A3, charcoal) and mutant (B31-5A3/ bb0605, light gray) strains using locus-specific primers and normalized relative to constitutively expressed flaB. Values are the mean + /- SD. n.d., not detected after 45 cycles. (C) Identifying changes in the peptidoglycan composition of B31-5A3/ bb0605 . Liquid chromatogram of mutanolysin treated PG isolated from B31-5A3 (top, in black) and B31-5A3/ bb0605 (bottom, in green). Each numbered peak corresponds to a muropeptide found in and , respectively. Peak 5 (shaded gray) corresponds to the muropeptide Glc N Ac-Mur N Ac-Ala-Glu-Orn-[Gly]-Ala-Ala). (D) MS (top) and MS/MS (bottom) of the Glc N Ac-Mur N Ac-Ala-Glu-Orn-[Gly]-Ala-Ala muropeptide. MS/MS fragmentation (inset) data confirms the pentapeptide(-Gly) structure.
Article Snippet: All reactions were performed on the same plate, using PCRBIO 1-Step Go RT-PCR Kit (PCR Biosystems) following the recommended procedures.
Techniques: Mutagenesis, Reverse Transcription Polymerase Chain Reaction, Isolation, Tandem Mass Spectroscopy