Pathogenic siderophore ABC importer YbtPQ adopts a …
YbtPQ is a heterodimeric ABC importer with a molecular size of ~130 kDa, occupying a space of 120 Å × 90 Å × 60 Å ( Fig. 2A ). Both YbtP and YbtQ are single polypeptide chains containing one N-terminal TMD and one C-terminal NBD. The sequence identity between YbtP and YbtQ is ~33%, and the similarity between is ~51%.