Cytoplasmic parafibromin/hCdc73 targets and destabilizes p53 mRNA to control p53-mediated apoptosis

Jay-Hyun Jo, Tae-Moon Chung, Hyewon Youn and Joo-Yeon Yoo ()
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Jay-Hyun Jo: Pohang University of Science and Technology, Life Science Building 208, POSTECH, Nam-Gu, Pohang, Gyungbuk 790-784, Korea
Tae-Moon Chung: Cancer Imaging Center, Seoul National University Cancer Hospital
Hyewon Youn: Cancer Imaging Center, Seoul National University Cancer Hospital
Joo-Yeon Yoo: Pohang University of Science and Technology, Life Science Building 208, POSTECH, Nam-Gu, Pohang, Gyungbuk 790-784, Korea

Nature Communications, 2014, vol. 5, issue 1, 1-12

Abstract: Abstract The parafibromin/hCdc73 is a component of the PAFc, which controls RNA polymerase II-mediated general transcription. In parathyroid carcinoma and familial autosomal dominant hyperparathyroidism-jaw tumour (HPT-JT), hCdc73 mutations are heavily implicated, yet the underlying mechanism of its carcinogenic action is poorly understood. Here we demonstrate that hCdc73 specifically controls messenger RNA stability of p53 and p53-mediated apoptosis. hCdc73 is associated with mature p53 mRNA in the cytoplasm and facilitates its degradation. Cytoplasmic hCdc73 physically interacts with eEF1Bγ and hSki8, and this interaction is required to bind and destabilize p53 mRNA. Furthermore, enhanced association of p53 mRNA with a cancer-driven hCdc73(K34Q) mutant was also observed. As a result, reduced p53 expression as well as enhanced cell proliferation was acquired in the hCdc73 (K34Q)-overexpressed cells. Altogether, our findings indicate that hCdc73 directly targets p53 mRNA to repress p53 expression, and aberrant regulation of this interaction may lead to tumour progression.

Date: 2014
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DOI: 10.1038/ncomms6433

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