Crystal structure of the outer membrane active transporter FepA from Escherichia coli.
Buchanan, S.K., Smith, B.S., Venkatramani, L., Xia, D., Esser, L., Palnitkar, M., Chakraborty, R., van der Helm, D., Deisenhofer, J.(1999) Nat Struct Biol 6: 56-63
- PubMed: 9886293 
- DOI: 10.1038/4931
- Primary Citation of Related Structures:  
1FEP - PubMed Abstract: 
Integral outer membrane receptors for iron chelates and vitamin B12 carry out specific ligand transport against a concentration gradient. Energy for active transport is obtained from the proton-motive force of the inner membrane through physical interaction with TonB-ExbB-ExbD, an inner membrane complex ...