FIG. 2.

Alignment of protein sequences of MalK of S. typhimurium and E. coli and LacK of A. radiobacter. Conserved sequence motifs of ABC proteins and the sites at which the MalK protein was split into fragment pairs are indicated above the alignment. LM1 to LM4 denote the joining points of the LacK′-′MalK chimeras described in the text. Sources of protein sequences are as follows: MalK of S. typhimurium (MALK STY), SwissProt accession no. P19566, corrected at position 141; MalK of E. coli (MALK ECO), SwissProt accession no. P02914; LacK of A. radiobacter (LACK ARA), SwissProt accession no. Q01937.