Title: Mapping of the RNA-binding and endoribonuclease domains of NIPP1, a nuclear targeting subunit of protein phosphatase 1
Authors: Jin, Qiming ×
Beullens, Monique
Jagiello, Izabela
Van Eynde, Aleyde
Vulsteke, Veerle
Stalmans, Willy
Bollen, Mathieu #
Issue Date: Oct-1999
Series Title: The Biochemical journal. vol:342 ( Pt 1) pages:13-9
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.
ISSN: 0264-6021
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biochemistry Section (Medicine) (-)
Molecular Genetics Section (-)
Department of Cellular and Molecular Medicine - miscellaneous
Laboratory of Biosignaling & Therapeutics
× corresponding author
# (joint) last author

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