Abstract:
:We have identified by immunoblotting and ADP-ribosylation by cholera toxin and pertussis toxin the presence of Mr 43 and 46 KDa Gs alpha, and 39 and 41 KDa Gi alpha subunits in rat parotid gland plasma membranes but not in granule membranes. A Mr 28 KDa polypeptide that served as substrate for ADP-ribosylation by both cholera toxin and pertussis toxin was present exclusively in granule membranes. Photoaffinity crosslinking of [alpha-32P]GTP showed the presence of high molecular weight GTP-binding proteins (Mr 160, 100 KDa) in granule membranes. Six low molecular weight GTP-binding proteins (Mr 21-28 KDa) were differentially distributed in both plasma membranes and granule membranes. The present study identifies various GTP-binding proteins in rat parotid gland plasma membranes and granule membranes, and demonstrates the presence of distinct molecular weight GTP-binding proteins in granule membranes. These granule-associated GTP-binding proteins may be involved in secretory processes.
journal_name
Mol Cell Biochemjournal_title
Molecular and cellular biochemistryauthors
Ali N,Agrawal DK,Cheung Pdoi
10.1007/BF00230326keywords:
subject
Has Abstractpub_date
1992-10-07 00:00:00pages
155-62issue
2eissn
0300-8177issn
1573-4919journal_volume
115pub_type
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