Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

G-proteins of rat liver membranes. Subcellular compartmentation and disposition in the plasma membrane

Ali, N., Milligan, G. and Evans, William Howard 1989. G-proteins of rat liver membranes. Subcellular compartmentation and disposition in the plasma membrane. Molecular and Cellular Biochemistry 91 (1-2) , pp. 75-84. 10.1007/BF00228081

Full text not available from this repository.


The distribution of the alpha- and beta-subunits of G-proteins and their disposition in rat liver plasma and intracellular membranes was investigated. Western blotting, using antibodies that recognised the alpha-subunit of the inhibitory and the beta-subunits of most G-proteins, identified 41 and 36 kDa polypeptides respectively in all plasma membrane functional domains, in endosomes as well as in Golgi membranes. Lysosomes were devoid of these subunits. The highest levels of G-protein subunits were found in bile canalicular plasma membranes prepared by density gradient centrifugation followed by free-flow electrophoresis. Separation of membrane proteins into extrinsic and intrinsic components was carried out by extraction of the membranes at pH 11.0 and by partitioning the membranes in Triton X-114/aqueous phases. The results demonstrated that the alpha- and beta-subunits were tightly associated with the hepatic membranes but they could be solubilised by extraction with detergent, e.g. SDS. Prolonged incubation in the presence of GTP analogues also released up to approximately 50% of the alpha-subunit of inhibitory G-proteins from membranes. The beta-subunit was still associated with membranes after alkaline extraction. The results emphasise the strong association of G-protein subunits with liver membranes, and show that these proteins are distributed widely in the plasma membrane and along the endocytic pathways of hepatocytes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > R Medicine (General)
Publisher: Springer
ISSN: 0300-8177
Last Modified: 04 Jun 2017 07:24

Citation Data

Cited 14 times in Google Scholar. View in Google Scholar

Cited 9 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item