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PMID: 1373486 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

Isolation of the mitochondrial benzodiazepine receptor: association with the voltage-dependent anion channel and the adenine nucleotide carrier.

McEnery MW, Snowman AM, Trifiletti RR, Snyder SH

Abstract

The mitochondrial benzodiazepine receptor (mBzR) has been solubilized with retention of reversible ligand binding, and the associated subunits were characterized. mBzR comprises immunologically distinct protein subunits of 18-, 30-, and 32-kDa. The 18-kDa protein is labeled by the isoquinoline carboxamide mBzR ligand [3H]PK14105, whereas the 30- and 32-kDa subunits are labeled by the benzodiazepine (Bz) ligands [3H]flunitrazepam and [3H]AHN-086. Selective antibodies and reagents identify the 32- and 30-kDa proteins as the voltage-dependent anion channel (VDAC) and the adenine nucleotide carrier (ADC), respectively. While isoquinoline carboxamide and Bz ligands target different subunits, they interact allosterically, as the binding of Bz and isoquinoline carboxamide ligands is mutually competitive at low nanomolar concentrations. Moreover, eosin-5-maleimide and mercuric chloride inhibit [3H]PK11195 binding to the intact receptor via sulfhydryl groups that are present in ADC. VDAC and ADC, outer and inner mitochondrial membrane channel proteins, respectively, together with the 18-kDa subunit, may comprise mBzR at functionally important transport sites at the junction of two mitochondrial membranes.

MeSH Terms
Affinity Labels/metabolism Animals Benzodiazepinones/metabolism Binding Sites Flunitrazepam/metabolism Ion Channels/metabolism Isoquinolines/metabolism Kidney/metabolism Kinetics Male Mitochondria/drug effects,metabolism Mitochondrial ADP, ATP Translocases/isolation & purification,metabolism Rats Rats, Inbred Strains Receptors, GABA-A/isolation & purification,metabolism Sulfhydryl Reagents/pharmacology Urea/pharmacology
Chemicals
Affinity Labels Benzodiazepinones Ion Channels Isoquinolines Receptors, GABA-A Sulfhydryl Reagents AHN 086 Flunitrazepam Urea Mitochondrial ADP, ATP Translocases PK 14105
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
McEnery M W
Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205-2185.
Snowman A M
Trifiletti R R
Snyder S H
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1992-04-15
Pages
3170-4
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC48827
Subset
IM
Grants
NIDA NIH HHS · DA-00074 · United States
NIDA NIH HHS · DA-00266 · United States
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