Gosset ATP-binding cassette transporter protein Overview
ATP-binding cassette transporter proteins (ABC transporters) are a large superfamily of multipass transmembrane proteins that utilize the energy from ATP hydrolysis to transport a wide variety of substrates—including ions, amino acids, peptides, lipids, metabolites, drugs, and toxins—across biological membranes. They are found in all kingdoms of life and are characterized by conserved nucleotide-binding domains (NBDs) and transmembrane domains (TMDs). In humans, at least 48 distinct ABC transporter genes exist, grouped into subfamilies (ABCA–ABCG), many of which play crucial roles in drug efflux, absorption, and resistance, regulation of physiological substrate levels, and disease processes such as cancer multidrug resistance and cystic fibrosis. ABC transporters may be importers or exporters and are implicated in essential cellular functions as well as numerous inherited and acquired human diseases. Their activity can profoundly affect the pharmacokinetics of multiple drug classes and influence patient response and safety profiles.
Mechanism of Action
Substrate efflux to reduce intracellular drug/toxin concentration (drug resistance) ATP hydrolysis–driven conformational change to mediate substrate transport Maintenance of concentration gradients across membranes
Biological Functions
Disease Associations
Safety Considerations
- Development of multidrug resistance limits chemotherapy efficacy
- Broad substrate specificity complicates drug-drug interactions
- Polymorphisms associated with variable drug response and adverse effects
- Potential for unintended impacts on absorption/excretion of endogenous substances
Interacting Drugs
Associated Biomarkers
| Biomarker |
|---|
| ABCB1 (P-glycoprotein) expression for multidrug resistance in cancers |
| ABCC7 (CFTR) mutation for cystic fibrosis |
| Expression of specific ABC subtypes in tissue for drug response or disease characterization |