NDLI: Conformational Changes of the Multispecific Transporter Organic Anion Transporter 1 (OAT1/SLC22A6) Suggests a Molecular Mechanism for Initial Stages of Drug and Metabolite Transport

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Conformational Changes of the Multispecific Transporter Organic Anion Transporter 1 (OAT1/SLC22A6) Suggests a Molecular Mechanism for Initial Stages of Drug and Metabolite Transport

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Cell Biochemistry and Biophysics : Volume 61, Issue 1, September 2011

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Conformational Changes of the Multispecific Transporter Organic Anion Transporter 1 (OAT1/SLC22A6) Suggests a Molecular Mechanism for Initial Stages of Drug and Metabolite Transport

Content Provider	Springer Nature Link
Author	Tsigelny, Igor F. Kovalskyy, Dmytro Kouznetsova, Valentina L. Balinskyi, Oleksii Sharikov, Yuriy Bhatnagar, Vibha Nigam, Sanjay K.
Copyright Year	2011
Abstract	The solute carrier (SLC) family of transporters play key roles in the movement of charged organic ions across the blood–urine, blood–cerebrospinal fluid, and blood–brain barriers and thus mediate the absorption, disposition, and elimination of many common pharmaceuticals (i.e., nonsteroidal anti-inflammatory drug (NSAIDs), antibiotics, and diuretics). They have also been proposed to participate in a remote sensing and signaling network involving small molecules. Nevertheless, other than possessing a 12-transmembrane α-helical topology comprised of two six-helix hemidomains interacting through a long loop, the structural and mechanistic details for these transporters remains unclear. Recent crystallographic studies of bacterial homologs support the idea of a “switching” mechanism, which allows for periodic changes in the overall transporter configuration and cyclic opening of the transporter to the extracellular or cytoplasmic sides of the membrane. To investigate this, computational modeling based on our recent study of glycerol-3-phosphate transporter (GlpT) (Tsigelny et al. J Bioinform Comput Biol 6:885–904, 2008) was performed for organic anion transporter 1 (OAT1/SLC22A6, originally identified as NKT), the prototypical member of this family. OAT1 was inserted into an artificial phospholipid bilayer and the positional change of the six-helix hemidomains relative to each other was followed for 100 ns. The hemidomains were found to tilt relative to each other while their configuration is mostly inflexible. Since the modeling was performed for about 100 ns, the data suggest that this tilting mechanism might explain the early steps in the transport of organic anionic metabolites, drugs, and toxins by this clinically important transporter.
Starting Page	251
Ending Page	259
Page Count	9
File Format	PDF
ISSN	10859195
Journal	Cell Biochemistry and Biophysics
Volume Number	61
Issue Number	2
e-ISSN	15590283
Language	English
Publisher	Humana Press Inc
Publisher Date	2011-04-16
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Organic anion transporter 1 Molecular dynamics Membrane proteins Pharmacology/Toxicology Biophysics and Biological Physics Cell Biology Biotechnology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Cell Biology Medicine Biochemistry Biophysics

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Conformational Changes of the Multispecific Transporter Organic Anion Transporter 1 (OAT1/SLC22A6) Suggests a Molecular Mechanism for Initial Stages of Drug and Metabolite Transport