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. 2021 Jul 21;12:707711. doi: 10.3389/fmicb.2021.707711

FIGURE 3.

FIGURE 3

The histidine at the position of 191 in FleS is conserved with other histidine kinase and important in FleS signaling. (A) Sequence alignment of the HisKA domain of FleS with nine canonical HisKA domains from YycG (WP_023482385.1), PhoR (WP_003121316.1), FixL (WP_011119443.1), VgrS (WP_011038221.1), MtrB (WP_003917137.1), CzcS (WP_016253371.1), FimS (WP_003096404.1), PhoQ (WP_003082438.1), BqsS (WP_003090493.1). The arrow indicates the conserved histidine residue that is involved in phosphoryl group transfer. (B,C) The importance of the FleS H191 in regulating biofilm formation (B) and swimming motility (C) was examined by ectopic expression of FleSH191A in the ΔfleS strain. ***P < 0.001, n.s., no significance (Student’s t-test). Representative images and the average diameter (D) of the swimming migration zone of each strain are shown. Each experiment was performed in triplicate.