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Title

A novel adenylylation process in liver plasma membrane-bound proteins

AuthorsSan José, Esteban; Benguria, Alberto; Villalobo, Antonio
Issue Date1990
PublisherAmerican Society for Biochemistry and Molecular Biology
CitationJournal of Biological Chemistry 265(33): 20653-20661 (1990)
AbstractRat liver plasma membrane contains five distinct polypeptides of apparent molecular mass of 130, 120, 110, 100, and 86 kDa which are labeled upon incubation with [α-32P]ATP as well as with [γ-32P]ATP. Covalently bound adenosine 5'-monophosphate to some of the polypeptides was identified using nonhydrolyzable analogues of ATP. Chase experiments of α-32P-nucleotide-labeled polypeptides with different nonradiolabeled phosphocompounds and sensitivity to different inhibitors demonstrate that the 86-kDa polypeptide is a phosphoesterase, forming a catalytic intermediate. On the other hand, the comparative slow rate of turnover of the polypeptides of higher molecular mass (130, 120, 110, and 100 kDa) suggests that the bound AMP could play a regulatory rather than a catalytic role. Using the nonhydrolyzable ATP analogue [α,β-methylene]ATP and dilution experiments with Triton X-100-solubilized membranes, it has been possible to identify the 130-kDa adenylated polypeptide as a possible target of an adenylylating system. These polypeptides, except the 86-kDa phosphoesterase, are affected in their electrophoretic mobility in the absence of β-mercaptoethanol. An intercatenary disulfide bond(s) appear(s) to link the polypeptide(s) of 120 kDa and/or 110 kDa in a dimeric structure of apparent molecular mass of 240 kDa. All five polypeptides labeled with [α-32P]ATP are glycoproteins bound to the cell plasma membrane.
URIhttp://hdl.handle.net/10261/78907
Identifiersissn: 0021-9258
e-issn: 1083-351X
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