Abstract:
:NAD+ glycohydrolase activity is found at high levels in submitochondrial particles. It leads to the reaction products ADP-ribose, nicotinamide, and small amounts of 5'-AMP. Furthermore, submitochondrial particles catalyze the exchange reaction: [adenosine-14C]ADP-ribose + NAD+ in equilibrium [adenosine-14C]-NAD+ + ADP-ribose. When submitochondrial particles are incubated with NAD+, mono(ADP-ribosyl)ation of protein molecules migrating with an apparent molecular weight of 30,000 in sodium dodecyl sulfate/polyacrylamide gel electrophoresis is demonstrable. Inhibitor studies suggest attachment of ADP-ribose to arginine residues. ADP-ribose bound to submitochondrial particles is rapidly turning over. The release of ADP-ribose from the protein is probably enzyme catalyzed. The rapid turnover, the specificity of the modification, and the inhibition of ADP-ribosylation by ATP and nicotinamide suggest a regulatory role of mono(ADP-ribosyl)ation of a protein in the inner mitochondrial membrane.
journal_name
Proc Natl Acad Sci U S Aauthors
Richter C,Winterhalter KH,Baumhüter S,Lötscher HR,Moser Bdoi
10.1073/pnas.80.11.3188subject
Has Abstractpub_date
1983-06-01 00:00:00pages
3188-92issue
11eissn
0027-8424issn
1091-6490journal_volume
80pub_type
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