Analysis of GTP-binding potein function with a photoaffinity GTP analog.
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- HATTA Shinichi
- Department of Pharmacology, School of Medicine, Sapporo Medical University
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- OHSHIKA Hideyo
- Department of Pharmacology, School of Medicine, Sapporo Medical University
Bibliographic Information
- Other Title
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- フォトアフィニティーGTP類似体を用いたGTP結合タンパク質の解析
- フォト アフィニティー GTP ルイジタイ オ モチイタ GTP ケツゴウ タ
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Abstract
The mechanism whereby hormones or neurotransmitters activate G proteins and their intracellular effectors can be studied in reconstituted systems using purified components. However, the regulation of receptor-G protein signaling appears to be substantially more complex in the cell and several additional components participate in this event. To study the relationship among G proteins receptors, and effectors in complex systems, such as membranes of permeable cells, it is necessary to employ methods that selectively allow the examination of G protein activation. One such method is photoaffinity labeling using a hydrolysis-resistant, photoaffinity GTP analog, P3 (4-azidoanilido)-P1-guanosine 5'-triphosphate (AAGTP). Here we describe the synthesis and purification of [32P] AAGTP as well as a procedure suitable studying the G protein function in membrane preparations. Photoaffinity labeling in rat cerebral cortex membranes showed that at least four G proteins (GsH, GsL, Gi, and Go) were labeled by [32P] AAGTP. [32P] AAGTP labeling on Gs and Gi was altered in concert with the activation states of those G proteins. An agonistspecific increase in [32P] AAGTP labeling of the G protein α-subunit in a membrane preparation has also been demonstrated. Thus, the photoaffinity labeling method with [32P] AAGTP makes it possible to investigate the behavior of individual G proteins in complex systems such as membrane preparations.
Journal
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- Folia Pharmacologica Japonica
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Folia Pharmacologica Japonica 105 (6), 431-436, 1995
The Japanese Pharmacological Society
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Keywords
Details 詳細情報について
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- CRID
- 1390001204272157824
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- NII Article ID
- 10005706693
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- NII Book ID
- AN00198335
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- COI
- 1:CAS:528:DyaK2MXmtlantr0%3D
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- ISSN
- 13478397
- 00155691
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- NDL BIB ID
- 3617025
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- PubMed
- 7557731
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed