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Prolyl oligopeptidase is a glyceraldehyde-3-phosphate dehydrogenase-binding protein that regulates genotoxic stress-induced cell death. | LitMetric

AI Article Synopsis

Article Abstract

Prolyl oligopeptidase is a serine protease that cleaves peptides shorter 30-mer at carboxyl side of an internal proline. This enzyme has been proposed to be involved in the maturation and degradation of peptide hormones and neuropeptides. However, conclusive results have not yet been reported, and the primary physiological role remains to be elucidated. Here, we describe the identification of a novel protein that interacts with prolyl oligopeptidase in a human neuroblastoma cell line NB-1. Using an affinity column with immobilized recombinant human prolyl oligopeptidase as ligand, we identified glyceraldehyde-3-phosphate dehydrogenase as a novel prolyl oligopeptidase binding protein in NB-1 cell extracts. The interaction between prolyl oligopeptidase and glyceraldehyde-3-phosphate dehydrogenase was confirmed by immunoprecipitation both in vitro and in vivo. To study the functional relevance of prolyl oligopeptidase-glyceraldehyde-3-phosphate dehydrogenase interactions, we investigated whether this interaction was involved in cytosine arabinoside-induced glyceraldehyde-3-phosphate dehydrogenase nuclear translocation and cell death. Prolyl oligopeptidase inhibitor, SUAM-14746, and prolyl oligopeptidase knockdown successfully inhibited glyceraldehyde-3-phosphate dehydrogenase translocation and promoted the survival of cytosine arabinoside-treated NB-1 cells. We also found that the interactions between prolyl oligopeptidase and glyceraldehyde-3-phosphate dehydrogenase in the cytoplasm but not in nuclei of NB-1 cell treated with cytosine arabinoside using an in situ proximity ligation assay. These results indicate that the interaction between prolyl oligopeptidase and glyceraldehyde-3-phosphate dehydrogenase is required for cytosine arabinoside-induced glyceraldehyde-3-phosphate dehydrogenase nuclear translocation and cell death. Therefore, the results of the present study demonstrate a novel function for prolyl oligopeptidase in cell death.

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http://dx.doi.org/10.1016/j.biocel.2013.01.009DOI Listing

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