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Updated: Aug 23, 2026
Selection of Transporter-Targeted Inhibitory Nanobodies by Solid-Supported-Membrane (SSM)-Based Electrophysiology
Published on: May 3, 2021
Towards an understanding of organic anion transporters: structure-function relationships
1Department of Pharmaceutics, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA. gyou@cop.rutgers.edu
Abstract:
Organic anion transporters (OAT) play essential roles in the body disposition of clinically important anionic drugs, including anti-viral drugs, anti-tumor drugs, antibiotics, anti-hypertensives, and anti-inflammatories. The activities of OATs are directly linked to drug toxicity and drug-drug interactions. So far, four members of the OAT family have been identified: OAT1, OAT2, OAT3, and OAT4. These transporters share several common structural features including 12 transmembrane domains, multiple glycosylation sites localized in the first extracellular loop between transmembrane domains 1 and 2, and multiple phosphorylation sites present in the intracellular loop between transmembrane domains 6 and 7, and in the carboxyl terminus. The impact of these structural features on the function of these transporters has just begun to be explored. In the present review, the author will summarize recent progress made from her laboratory as well as from others, on the molecular characterization of the structure-function relationships of OATs, including particular amino acid residues/regions of the transporter protein ("molecular domains") that potentially determine transport characteristics.
Insights
Organic anion transporters (OATs) are crucial for drug metabolism and interactions. This review explores their structure-function relationships, focusing on molecular domains that influence transport characteristics.
Area of Science:
- Pharmacology
- Molecular Biology
- Biochemistry
Background:
- Organic anion transporters (OATs) are vital for the disposition of numerous anionic drugs, influencing their efficacy and toxicity.
- OATs are implicated in significant drug-drug interactions and clinical outcomes.
- Four OAT family members (OAT1-4) have been identified, sharing common structural features.
Purpose of the Study:
- To review recent advancements in the molecular characterization of OAT structure-function relationships.
- To highlight the role of specific molecular domains in determining OAT transport characteristics.
- To synthesize findings from the author's laboratory and other researchers.
Main Methods:
- Review of existing literature on OAT molecular characterization.
- Analysis of structure-function studies focusing on OATs.
- Integration of data on amino acid residues and regions influencing transporter function.
Main Results:
- OATs possess conserved structural features, including transmembrane domains, glycosylation, and phosphorylation sites.
- Specific molecular domains within OATs are critical for their transport functions.
- Understanding these domains is key to predicting drug interactions and toxicity.
Conclusions:
- Further exploration of OAT structure-function relationships is essential for optimizing drug therapy.
- Identifying key molecular domains can guide the development of targeted therapies and predict drug interactions.
- Continued research is needed to fully elucidate the functional impact of OAT structural features.
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