Tissue and subcellular distributions of an inhibitory GDP GTP exchange protein (GDI) for smg p25A by use of its antibody

Hidetaro Nonaka, Kozo Kaibuchi, Kazuya Shimizu, Juro Yamamoto, Yoshimi Takai

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We have recently purified from bovine brain cytosol to near homogeneity a GDP GTP exchange protein for smg p25A, named smg p25A GDI, that inhibits the dissociation of GDP from and the subsequent binding of GTP to smg p25A. In the present study, we made an antiserum against smg p25A GDI and studied its tissue distribution in rat and its subcellular distribution in rat cerebrum by use of this antiserum. smg p25A GDI was found in secretory cells with both regulated and constitutive secretion types. Since smg p25A was previously found in only secretory cells with a regulated secretion type, this result suggests that small GTP-binding proteins different from smg p25A but recognized by smg p25A GDI are present in secretory cells with a constitutive secretion type, and that smg p25A GDI is involved in both regulated and constitutive secretory processes. In subcellular fractionation analysis of rat cerebrum, smg p25A GDI was mostly found in the cytosol fraction of neuron body and synaptosome. In synaptosome, it was mainly found in the synaptic cytosol.

Original languageEnglish
Pages (from-to)556-563
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume174
Issue number2
DOIs
Publication statusPublished - 31-01-1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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