Abstract:
:G13 belongs to the G12-subfamily of heterotrimeric regulatory G-proteins. Employing specific antibodies, we isolated G alpha 13 from bovine brain by a four-step purification protocol combining conventional and affinity chromatography. The use of ethylene glycol as a protective agent influenced the elution properties of G alpha 13 markedly. Only in the presence of ethylene glycol (30% v/v) a clear separation of G alpha 13 from other G-proteins was achieved during the initial anion exchange chromatography. This allowed isolation of G alpha 13 by subunit exchange chromatography on beta gamma-agarose. G alpha 13 was only released from immobilized beta gamma-dimers via activation by AMF but not by GTP gamma S, pointing to a poor basal nucleotide exchange of this protein. In contrast, N-terminally truncated G alpha 13 did not bind to immobilized beta gamma-dimers.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Harhammer R,Nürnberg B,Spicher K,Schultz Gdoi
10.1006/bbrc.1994.2535subject
Has Abstractpub_date
1994-10-28 00:00:00pages
835-40issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(84)72535-6journal_volume
204pub_type
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