FIG. 2.

(A) Map of ChvD indicating sites of Walker A boxes (box 1), the LSGG signatures (box 2), Walker B boxes (box 3), and the conserved histidine found in most ABC transporters (box 4). The orientation of the lacZ gene from the inserted plasmids pZL101 (upper) and pZL103 (lower) are also shown. (B) BLAST comparison of the amino acid sequences of ChvD and CarA, where the middle line indicates identical (letters) and conserved (+) amino acids.