Fig. 1. Mutations in slpA confer Av-CD291.2 resistance.

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Fig. 1. Mutations in slpA confer Av-CD291.2 resistance. Mutations in slpA confer Av-CD291.2 resistance. (A) Alignment of the slpA sequence (nucleotides 268 to 294) from R20291, FM2.5, FM2.6, FM2.5RW, and FM2.6RW. A nucleotide insertion at position 283 of FM2.5 slpA results in a frameshift and premature stop codon (blue). A nucleotide substitution at position 280 of FM2.6 slpA results in a nonsense mutation (red). To allow differentiation from the wild-type sequence, we introduced two synonymous mutations into slpA in FM2.5RW and FM2.6RW (green). (B) SDS–polyacrylamide gel electrophoresis (SDS-PAGE) analysis of S-layer extracts from R20291, FM2.5, FM2.6, FM2.5RW, and FM2.6RW. The positions of the LMW and HMW SLPs and minor cell wall proteins Cwp2 and Cwp6 are indicated. (C and D) The impact of Av-CD291.2 on exponentially growing R20291, FM2.5, FM2.5RW, and FM2.6RW was monitored by measuring the OD600nm. Av-D291.2 addition is indicated with an arrow. Experiments were carried out in triplicate on biological duplicates. Means and SDs are shown. (E and F) SDS-PAGE analysis and Av-CD291.2 sensitivity of FM2.5 complemented with slpA alleles from multiple SLCTs after induction with anhydrotetracycline (20 ng/ml). R20291 and FM2.5RW are included as controls. A zone of clearance in the agar lawn indicates killing. Joseph A. Kirk et al., Sci Transl Med 2017;9:eaah6813 Published by AAAS