Figure 1. Topology of Cdr1p and sequence alignment of Walker B and extended Walker B motifs from various ABC transporters.
The sequence alignment of Walker B and extended Walker B motifs residues in NBDs with those from other nucleotide binding domains of some known ABC transporters. The conserved Asp and Asn residue within and adjacent the Walker B motifs, respectively, of fungal NBDs and the equivalent Asp/Glu in non-fungal NBDs is shown in bold and underlined.