Abstract：
:Purified ornithine decarboxylase (EC 4.1.1.17, ODC) transamidated with four putrescine moieties on four glutamine residues through the action of transglutaminase (EC 2.3.2.13, TGase) purified from guinea pig liver, when added to isolated rat liver nuclei, stoichiometrically increased the activity of RNA polymerase I (EC 2.7.7.6). The increase was relative to the pmoles of purified conjugated ODC added to the reaction and could be reinitiated after the reaction had plateaued by the further addition of ODC-putrescine conjugate. The kinetics of the reaction suggest that the ODC-putrescine conjugate was not reused but degraded after each initiation. Otherwise, the rapid plateau would not be observed. The repeated addition of 278 pmoles of purified ODC-putrescine conjugate to rat liver nuclear preparations containing 200 micrograms total protein consistently stimulated the incorporation of 600-700 pmoles UMP/mg protein. We suggest that ODC transamidated by its product putrescine may be the posttranslationally modified 65,000 Mr protein which has been reported by several laboratories to serve as a labile subunit of RNA polymerase I.
journal_name
Biochem Pharmacoljournal_title
Biochemical pharmacologyauthors
Russell DH,Manen CAdoi
10.1016/0006-2952(82)90614-1subject
Has Abstractpub_date
1982-11-01 00:00:00pages
3373-8issue
21eissn
0006-2952issn
1873-2968pii
0006-2952(82)90614-1journal_volume
31pub_type
杂志文章abstract：:4-S-Cysteaminylphenol (4-S-CAP) and the corresponding catechol 4-S-cysteaminylcatechol (4-S-CAC) have been evaluated for melanocytotoxicity. It was shown recently that tyrosinase oxidation of these substrates produces a violet pigment, dihydro-1,4-benzothiazine-6,7-dione (BQ). In this study we examined whether BQ is t...
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pub_type： 杂志文章
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更新日期：1982-04-15 00:00:00
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pub_type： 杂志文章
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：1987-02-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
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更新日期：1995-01-06 00:00:00
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pub_type： 杂志文章
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更新日期：1985-01-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 历史文章,杂志文章
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更新日期：2008-07-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(87)90487-4
更新日期：1987-06-15 00:00:00
