Human PP11 ( placental protein 11) was previously described as a serine protease specifically expressed in the syncytiotrophoblast and in numerous tumor tissues. Several PP11-like proteins were annotated in distantly related organisms, such as worms and mammals, suggesting their involvement in evolutionarily conserved processes. Based on sequence similarity, human PP11 was included in a protein family whose characterized members are XendoU, a Xenopus laevis endoribonuclease involved in small nucleolar RNA processing, and Nsp15, an endoribonuclease essential for coronavirus replication. Here we show that the bacterially expressed human PP11 displays RNA binding capability and cleaves single stranded RNA in a Mn(2+)-dependent manner at uridylates, to produce molecules with 2', 3'-cyclic phosphate ends. These features, together with structural and mutagenesis analyses, which identified the potential active site residues, reveal striking parallels to the amphibian XendoU and assign a ribonuclease function to PP11. This newly discovered enzymatic activity places PP11-like proteins in a completely new perspective.

The Tumor Marker Human Placental Protein 11 Is an Endoribonuclease / Pietro, Laneve; Gioia, Ubaldo; Ragno, Rino; Altieri, Fabio; DI FRANCO, Carmela Antonia; Santini, Tiziana; M., Arceci; Bozzoni, Irene; E., Caffarelli. - In: THE JOURNAL OF BIOLOGICAL CHEMISTRY. - ISSN 0021-9258. - STAMPA. - 283:50(2008), pp. 34712-34719. [10.1074/jbc.m805759200]

The Tumor Marker Human Placental Protein 11 Is an Endoribonuclease

GIOIA, UBALDO;RAGNO, Rino;ALTIERI, Fabio;DI FRANCO, Carmela Antonia;SANTINI, Tiziana;BOZZONI, Irene;
2008

Abstract

Human PP11 ( placental protein 11) was previously described as a serine protease specifically expressed in the syncytiotrophoblast and in numerous tumor tissues. Several PP11-like proteins were annotated in distantly related organisms, such as worms and mammals, suggesting their involvement in evolutionarily conserved processes. Based on sequence similarity, human PP11 was included in a protein family whose characterized members are XendoU, a Xenopus laevis endoribonuclease involved in small nucleolar RNA processing, and Nsp15, an endoribonuclease essential for coronavirus replication. Here we show that the bacterially expressed human PP11 displays RNA binding capability and cleaves single stranded RNA in a Mn(2+)-dependent manner at uridylates, to produce molecules with 2', 3'-cyclic phosphate ends. These features, together with structural and mutagenesis analyses, which identified the potential active site residues, reveal striking parallels to the amphibian XendoU and assign a ribonuclease function to PP11. This newly discovered enzymatic activity places PP11-like proteins in a completely new perspective.
2008
01 Pubblicazione su rivista::01a Articolo in rivista
The Tumor Marker Human Placental Protein 11 Is an Endoribonuclease / Pietro, Laneve; Gioia, Ubaldo; Ragno, Rino; Altieri, Fabio; DI FRANCO, Carmela Antonia; Santini, Tiziana; M., Arceci; Bozzoni, Irene; E., Caffarelli. - In: THE JOURNAL OF BIOLOGICAL CHEMISTRY. - ISSN 0021-9258. - STAMPA. - 283:50(2008), pp. 34712-34719. [10.1074/jbc.m805759200]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/228400
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