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Protein Science, Vol 1, Issue 10 1326-1332, Copyright © 1992 by Cold Spring Harbor Laboratory Press

ARTICLE

A new subfamily of bacterial ABC-type transport systems catalyzing export of drugs and carbohydrates

J. REIZER, A. REIZER and M. H. SAIER-JR.
Department of Biology, University of California at San Diego, La Jolla, California 92093-0116

Sequence comparison studies revealed that the drug resistance transporter of Streptomyces peucetius (DrrAB) and two nodulation gene products (NodIJ) of Rhizobium leguminosarum are homologous to proteins encoded by three sets of genes that comprise capsular polysaccharide export systems in gram-negative bacteria: KpsTM of Escherichia coli, BexABC of Haemophilus influenzae, and CtrDCB of Neisseria meningitidis. These five systems comprise a new subfamily within the family of ATP binding cassette (ABC)-type transporters. We have termed this subfamily the ABC-2 subfamily. For three of the systems comprising this subfamily (Drr, Nod, and Kps) only one integral membrane constituent has been identified, whereas for the other two systems (Bex and Ctr) two dissimilar integral membrane constituents have been found. This observation suggests that the transmembrane channels of ABC-2-type transporters can be formed of homo- or heterooligomers as is true of several other classes of transport systems.
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