YbaJ regulates biofilm formation. It also has an important role in the regulation of motility in the biofilm. YbaJ functions in increasing conjugation, aggregation and decreasing the motility, resulting in an increase of biofilm [1]

1: Hha, YbaJ, and OmpA regulate Escherichia coli K12 biofilm formation and conjugation plasmids abolish motility. Barrios AF, Zuo R, Ren D, Wood TK; Biotechnol Bioeng. 2006;93:188-200. PMID:16317765