Evidence for disaggregation of oligomeric G0α induced by guanosine-5′-3-O-(thio)triphosphate activation

L. Zhang, Shengyu Yang, Y. Huang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Myristoylated G0α was expressed in and highly purified from Escherichia coli strain JM109 cotransformed with pQE60 (G0α) and pBB131 (N-myristoyltransferase, NMT). Non-denaturing gel electrophoresis and gel filtration analysis revealed that the G0α, in its GDP-bound form, could form oligomers involving dimer, trimer, tetramer, pentamer, or hexamer and guanosine 5′-3-O-(thio)triphosphate (GTPγS) activation induced disaggregation of the G0α oligomers to monomers. The G0α was crosslinked by a cross-linker, N,N′-1,4-phenylenedimaleimide (p-PDM), yielding multiple crosslinked products. In contrast, no obvious cross-linking occurred when G0α was pretreated with GTPγS. Immunoblot analysis also demonstrated oligomerization of the purified G0α proteins and its disaggregation triggered by GTPγS. These results provided direct evidence for the "disaggregation - coupling" theory and the disaggregation action of GTPγS may further elucidate the regulatory role of GDP/GTP exchange in G protein-coupled signal transduction pathways.

Original languageEnglish (US)
Pages (from-to)121-128
Number of pages8
JournalBiochemistry (Moscow)
Volume68
Issue number1
DOIs
StatePublished - Jan 1 2003

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Guanosine 5'-O-(3-Thiotriphosphate)
Guanosine Triphosphate
GTP-Binding Proteins
Oligomers
Gel Chromatography
Electrophoresis
Signal Transduction
Gels
Chemical activation
Escherichia coli
Signal transduction
Oligomerization
Dimers
Pulse width modulation
Proteins
Monomers
glycylpeptide N-tetradecanoyltransferase
N,N'-4-phenylenedimaleimide

All Science Journal Classification (ASJC) codes

  • Biochemistry

Cite this

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title = "Evidence for disaggregation of oligomeric G0α induced by guanosine-5′-3-O-(thio)triphosphate activation",
abstract = "Myristoylated G0α was expressed in and highly purified from Escherichia coli strain JM109 cotransformed with pQE60 (G0α) and pBB131 (N-myristoyltransferase, NMT). Non-denaturing gel electrophoresis and gel filtration analysis revealed that the G0α, in its GDP-bound form, could form oligomers involving dimer, trimer, tetramer, pentamer, or hexamer and guanosine 5′-3-O-(thio)triphosphate (GTPγS) activation induced disaggregation of the G0α oligomers to monomers. The G0α was crosslinked by a cross-linker, N,N′-1,4-phenylenedimaleimide (p-PDM), yielding multiple crosslinked products. In contrast, no obvious cross-linking occurred when G0α was pretreated with GTPγS. Immunoblot analysis also demonstrated oligomerization of the purified G0α proteins and its disaggregation triggered by GTPγS. These results provided direct evidence for the {"}disaggregation - coupling{"} theory and the disaggregation action of GTPγS may further elucidate the regulatory role of GDP/GTP exchange in G protein-coupled signal transduction pathways.",
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Evidence for disaggregation of oligomeric G0α induced by guanosine-5′-3-O-(thio)triphosphate activation. / Zhang, L.; Yang, Shengyu; Huang, Y.

In: Biochemistry (Moscow), Vol. 68, No. 1, 01.01.2003, p. 121-128.

Research output: Contribution to journalArticle

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AB - Myristoylated G0α was expressed in and highly purified from Escherichia coli strain JM109 cotransformed with pQE60 (G0α) and pBB131 (N-myristoyltransferase, NMT). Non-denaturing gel electrophoresis and gel filtration analysis revealed that the G0α, in its GDP-bound form, could form oligomers involving dimer, trimer, tetramer, pentamer, or hexamer and guanosine 5′-3-O-(thio)triphosphate (GTPγS) activation induced disaggregation of the G0α oligomers to monomers. The G0α was crosslinked by a cross-linker, N,N′-1,4-phenylenedimaleimide (p-PDM), yielding multiple crosslinked products. In contrast, no obvious cross-linking occurred when G0α was pretreated with GTPγS. Immunoblot analysis also demonstrated oligomerization of the purified G0α proteins and its disaggregation triggered by GTPγS. These results provided direct evidence for the "disaggregation - coupling" theory and the disaggregation action of GTPγS may further elucidate the regulatory role of GDP/GTP exchange in G protein-coupled signal transduction pathways.

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