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| Content Provider | PubMed Central |
|---|---|
| Author | Jin, Q. Beullens, M. Eynde, A. Van Stalmans, W. Bollen, M. Jagiello, I. Vulsteke, V. |
| Abstract | NIPP1 (351 residues) is a major regulatory and RNA-anchoring subunit of protein phosphatase 1 in the nucleus. Using recombinant and synthetic fragments of NIPP1, the RNA-binding domain was mapped to the C-terminal residues 330-351. A synthetic peptide encompassing this sequence equalled intact NIPP1 in RNA-binding affinity and could be used to dissociate NIPP1 from the nuclear particulate fraction. An NIPP1 fragment consisting of residues 225-351 (Ard1/NIPP1gamma), that may be encoded by an alternatively spliced transcript in transformed B-lymphocytes, displayed a single-strand Mg(2+)-dependent endoribonuclease activity. However, full-length NIPP1 and NIPP1(143-351) were not able to cleave RNA, indicating that the endoribonuclease activity of NIPP1 is restrained by its central domain. The endoribonuclease activity was also recovered in the RNA-binding domain, NIPP1(330-351), but with a 30-fold lower specific activity. Thus, the endoribonuclease catalytic site and the RNA-binding site both reside in the C-terminal 22 residues of NIPP1. The latter domain does not conform to any known nucleic-acid binding motif. |
| Starting Page | 13 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | Pt 1 |
| Volume Number | 342 |
| Language | English |
| Publisher Date | 1999-08-15 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology Biochemistry |
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