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Subcellular distribution of protein kinase C of GH3 cells: quantitation and characterization by polyacrylamide gel electrophoresis.

Abstract：

:Quantitative estimation of cytosolic Ca2+- and phospholipid-dependent protein kinase (PKC) activity was performed by polyacrylamide gel electrophoresis under nondenaturating conditions (PAGE). With this method less than 50 micrograms of cytosol protein can be accurately quantitated for PKC activity. The amount of cytosolic PKC activity recovered after PAGE was comparable to the amount obtained by DEAE-cellulose chromatography. Homogenization of GH3 cells in the presence of 2 mM EGTA/EDTA revealed that 80% of the total cellular PKC activity resided in the cytosol. However, omission of the ion chelator during cell disruption followed by subcellular fractionation and extraction of subcellular fractions by EDTA/EGTA showed that 80% of the total PKC was found in the lysosomal-mitochondrial and microsomal extracts. Detailed analysis of PKC activities demonstrated that cytosolic PKC was identical with the PKC solubilized by EDTA/EGTA from subcellular fractions. In conclusion, GH3 cells appear to contain one species of PKC with an apparent molecular weight of 90,000 which seems to be associated with membranes via a calcium-dependent mechanism (or mechanisms).

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Fabbro D,Jungmann RA,Eppenberger U

doi

10.1016/0003-9861(85)90816-1

subject

Has Abstract

pub_date

1985-05-15 00:00:00

pages

102-11

issue

1

eissn

0003-9861

issn

1096-0384

pii

0003-9861(85)90816-1

journal_volume

239

pub_type

杂志文章

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