The ATP-binding cassette (ABC) transporters belong to the largest known transporter gene family and translocate a variety of substrates including chemotherapy agents. ABC multidrug transporter expression has been implicated in tumor cell resistance to anticancer therapy, altered disposition of chemotherapy drugs, and associated chemotherapy toxicity. More recently, genetic heterogeneity has bee...

More than 40 nitrate respiration-deficient mutants of Haloferax volcanii belonging to three different phenotypic classes were isolated. All 15 mutants of the null phenotype were complemented with a genomic library of the wild type. Wild-type copies of mutated genes were recovered from complemented mutants using two different approaches. The DNA sequences of 13 isolated fragments were determined...

1. Abstract 2. Introduction 3. Discussion 3.1. ABC lipid transporters 3.1.2. Macrophage ABC lipid transporters 3.1.3. ABC transporter mediated lipid export from the liver 3.2. ABCA1 is a key regulator of HDL metabolism and cellular cholesterol and phospholipid export 3.2.1. ABCA1 mediated cholesterol trafficking and caveolae 3.2.2. ABCA1 and NPC1: two major regulators of cellular cholesterol tr...

Background: The transporter associated with antigen processing (TAP) is an ABC transporter whose experimental structure is not known. Results:We have modeled TAP based on the crystal structures of three related ABC transporters. Conclusion:We identified a possible peptide binding conformation in the transport cycle of TAP. Significance:These models help interpret experimental data and give info...

The ATP binding cassette (ABC) transporters superfamily is one of the largest classes of membrane proteins. The core of the ABC transporter protein is composed of transmembrane domains (TMDs) and nucleotide binding domains (NBD). Eukaryotes ABC transporters are classified into seven main families (ABCA to ABCG) based on sequence similarity and domain organizations. With different domain number ...

The phenomenon of multidrug resistance in cancer is often associated with the overexpression of the ABC (ATP-binding cassette) transporters Pgp (P-glycoprotein) (ABCB1), MRP1 (multidrug resistance-associated protein 1) (ABCC1) and ABCG2 [BCRP (breast cancer resistance protein)]. Since the discovery of Pgp over 35 years ago, studies have convincingly linked ABC transporter expression to poor out...

Fusarium graminearum is a plant pathogen infecting several important cereals, resulting in substantial yield losses and mycotoxin contamination of the grain. Triazole fungicides are used to control diseases caused by this fungus on a worldwide scale. Our previous microarray study indicated that 15 ABC transporter genes were transcriptionally upregulated in response to tebuconazole treatment. He...

In parasites, ATP-binding cassette (ABC) transporters represent an important family of proteins related to drug resistance and other biological activities. Here we report the characterization of LtrABCA2, a new ABC transporter of the ABCA subfamily in the protozoan parasite Leishmania tropica, localized at the flagellar pocket region and in internal vesicles. The overexpression of this transpor...

The phenomenon of multidrug resistance (MDR) has decreased the hope for successful cancer chemotherapy. The ATP-binding cassette (ABC) transporter superfamily is the largest transmembrane family. The overexpression of ABC transporters is a major determinant of MDR in cancer cells both in vitro and in vivo. Unfortunately, until recently, most of the strategies used to surmount ABC-transporter-me...

Overexpression of pleiotropic drug resistance (PDR) efflux pumps of the ATP-binding cassette (ABC) transporter superfamily is the major cause of fungal multi-drug resistance and decreased efficacy of antifungal drugs. This review focused on recent progresses in understanding of the PDR efflux pumps of ABC transporter superfamily in Saccharomyces cerevisiae and the fungal pathogens Candida albic...