Fig 5.

Comparative proposed A. hydrophila and Vibrio parahaemolyticus (9) lateral flagellar gene transcription hierarchies. Diagrams show the three levels of lateral flagellar hierarchy, class I to III. Class I genes are at the top of the hierarchy, being σ⁷⁰ dependent (dep.) in Aeromonas. One of the class I genes encodes a σ⁵⁴-associated transcriptional activator (LafK) that activates σ⁵⁴-dependent promoters preceding the class II clusters. One of the class II genes encodes the σ²⁸ factor (LafS), which activates the transcription of class III genes. In Aeromonas, the σ²⁸ factor might also be transcribed from another promoter.