Abstract:
:Labeling of 21-kDa material was observed when bovine brain soluble fraction was incubated with [adenylate-32P]NAD+ in the presence of GTP. The 21-kDa substrate, slightly smaller than C3 substrate in size, was labeled even without C3 exoenzyme. GTP could be replaced by nucleoside triphosphates other than ATP while ATP inhibited the GTP-induced labeling of 21-kDa substrate. After incubation of the soluble fraction with [adenylate-32P]NAD+ in the presence of GTP, [32P]ADP and [32P]ATP were detected in addition to [32P]AMP and [32P]ADP-ribose while only the last two nucleotides were observed without GTP. The 21-kDa substrate was labeled with [alpha-32P]ATP even in the absence of GTP, suggesting adenylylation rather than ADP-ribosylation. The labeled 21-kDa substrate, was extractable by phenol, disappeared with RNase treatment but not with tryptic digestion. Alkaline treatment of the phenol extract yielded an equal mixture of 3'-[32P]CMP and 2'-[32P]CMP. From these results we concluded that the 21-kDa labeling is a result of tRNA tailing with [alpha-32P]ATP generated from the [32P]AMP moiety of [adenylate-32P]NAD+. Results from reconstitution experiments using enzymes and tRNA purified from bovine brain soluble fraction, which are involved in this pathway, confirmed our conclusion.
journal_name
Biochimiejournal_title
Biochimieauthors
Badruzzaman M,Miyaoka T,Terashima M,Yamada K,Ohno T,Yamamori C,Tsuchiya M,Shimoyama Mdoi
10.1016/s0300-9084(97)86150-0subject
Has Abstractpub_date
1997-07-01 00:00:00pages
407-13issue
7eissn
0300-9084issn
1638-6183pii
S0300-9084(97)86150-0journal_volume
79pub_type
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