This proposal describes studies designed to understand the mechanisms by which drugs such as cocaine and neurotoxic amphetamine derivatives interact with proteins that mediate biogenic amine transport. The experiments focus on the serotonin, norepinephrine, and dopamine transport systems responsible for biogenic amine influx across the plasma membrane and the biogenic amine transporter that catalyzes transport into secretory granules. These transporters are responsible for the neuronal reuptake and storage of serotonin, dopamine, and norepinephrine which terminates these transmitters' action at the synapse and recycles transmitter to the synaptic vesicle. Transport studies will assess the ability of neurotoxic amphetamine derivatives to serve as substrates or inhibitors of the serotonin transporter. Binding studies with membranes containing a single monoamine transport system will provide information about the interaction between the cocaine and monoamine binding sites. The ionic form of the substrate amino group in biogenic amine transporters will be investigated using novel fluorinated substrate analogues. cDNA libraries will be screened with a cDNA clone for the norepinephrine transporter. In parallel, plasmid cDNA libraries will be screened by transfection into cultured mammalian cells for expression cloning of the serotonin transporter. Cloned transporter cDNA will be used to search for other serotonin transporters and also for the dopamine transporter by nucleic acid homology. Site-directed polyclonal antibodies will be used to elucidate the transporter tertiary structure. Expression of the cloned transporter in transfected mammalian cells will allow better understanding of the biosynthesis, stoichiometry, electrogenicity and mechanism of the plasma membrane biogenic amine transporters. Such expression systems will be used to probe the relationship between structure and function in membrane transport and its inhibition by cocaine and other drugs.

Agency
National Institute of Health (NIH)
Institute
National Institute on Drug Abuse (NIDA)
Type
Research Project (R01)
Project #
5R01DA007259-02
Application #
3213936
Study Section
Drug Abuse Biomedical Research Review Committee (DABR)
Project Start
1991-12-15
Project End
1994-11-30
Budget Start
1992-12-01
Budget End
1993-11-30
Support Year
2
Fiscal Year
1993
Total Cost
Indirect Cost
Name
Yale University
Department
Type
Schools of Medicine
DUNS #
082359691
City
New Haven
State
CT
Country
United States
Zip Code
06520
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Zhang, Yuan-Wei; Turk, Benjamin E; Rudnick, Gary (2016) Control of serotonin transporter phosphorylation by conformational state. Proc Natl Acad Sci U S A 113:E2776-83
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Rudnick, Gary (2013) How do transporters couple solute movements? Mol Membr Biol 30:355-9
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Bulling, Simon; Schicker, Klaus; Zhang, Yuan-Wei et al. (2012) The mechanistic basis for noncompetitive ibogaine inhibition of serotonin and dopamine transporters. J Biol Chem 287:18524-34

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