1995 Fiscal Year Final Research Report Summary
STUDIES OF STRUCTURE AND FUNCTION ON CEREBRAL GABA_B RECEPTOR
| Project/Area Number |
05454152
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
General pharmacology
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| Research Institution | KYOTO PREFECTURAL UNIVERSITY OF MEDICINE |
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Principal Investigator |
KURIYAMA Kinya KYOTO PREFECTURAL UNIVERSITY OF MEDICINE,PROFESSOR, 医学部, 教授 (20079734)
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| Co-Investigator(Kenkyū-buntansha) |
TSUJIMURA Atusi KYOTO PREFECTURAL UNIVERSITY OF MEDICINE,ASSISTANT, 医学部, 助手 (50236890)
HIROUCHI Masaaki KYOTO PREFECTURAL UNIVERSITY OF MEDICINE,ASSISTANT, 医学部, 助手 (70181196)
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| Project Period (FY) |
1993 – 1995
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| Keywords | GABA_B receptor / G protein-coupled receptor / Purification / Gi protein / Monoclonal antibody |
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| Research Abstract |
The GTP-binding protein was purified from the bovine cerebral cortex and this preparation was found to contain the Gi protein but not Gs and Go proteins. It was reconstituted into the phospholipid vesicles with another two functional proteins, purified GABA_B receptor and purified adenylyl cyclase. These reconstitutionexperimentshave indicated that the GABA_B receptor directly inhibits the adenylyl cyclase activity through the Gi protein. On the other hand, a partial amino acid sequence of the GABA_B receptor was analyzed. It has been suggested a possibility that this sequence may be a part of G protein-coupled receptor. Therefore, the polymerase-chain-reaction (PCR) has been attempted using the transmembrane domains (TM), which have highly homologous sequences among various G protein-coupled receptors. A PCR product (278 bp) was obtained and its deduced amino acid sequences indicated that it might be a region from TM III to TM V.Furthermore, a cDNA library from the rat embryo brain was screened using this PCR product as a probe. As the results of these screenings, several positive clones which contained possible coding regions of a novel G protein-coupled receptor were obtained. The size of these cDNA was found to be 1.5-3.0kb.
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