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. 2002 May;184(9):2439–2446. doi: 10.1128/JB.184.9.2439-2446.2002

FIG. 4.

FIG. 4.

FIG. 4.

Sequence alignments of the K. pneumoniae (Kp) sensor kinases CitY and CitA (A), the K. pneumoniae response regulators CitZ and CitB (B), the K. pneumoniae secondary carriers CitW and CitS (C), and the CitX proteins from K. pneumoniae and E. coli (Ec) (D). The phosphorylation sites of the sensor kinases (His-350 of CitA and His-351 of CitY) and the response regulators (Asp-56 of CitB and Asp-58 of CitZ) and the signature sequence previously reported to be conserved in members of the CitX family (29) are indicated by asterisks.