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Over‐expression of SUMO‐1 induces the up‐regulation of heterogeneous nuclear ribonucleoprotein A2/B1 isoform B1 (hnRNP A2/B1 isoform B1) and uracil DNA glycosylase (UDG) in hepG2 cells
Author(s) -
Ma Kit Wan,
Au Shan W. N.,
Waye Mary M. Y.
Publication year - 2009
Publication title -
cell biochemistry and function
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.933
H-Index - 61
eISSN - 1099-0844
pISSN - 0263-6484
DOI - 10.1002/cbf.1562
Subject(s) - sumo protein , gene isoform , microbiology and biotechnology , ribonucleoprotein , heterogeneous nuclear ribonucleoprotein , biology , uracil dna glycosylase , ubiquitin , dna glycosylase , dna damage , dna , gene , biochemistry , rna
Sumoylation is one of the post‐translational modifications that governs many cellular activities, including subcellular localization targeting, protein‐protein interaction, and transcriptional activity regulation. SUMO E3 ligases are responsible for substrate specificity determination in which PIAS is the largest E3 family that consists of five members in human; they are PIAS1, PIAS3, PIASx α , PIASx β , and PIASy. Several studies showed that all these PIAS genes are highly expressed in testis but only a few reports have discussed their expression pattern in other tissues. Though liver is a multifunctional organ and one would expect to find regulation of cellular functions by sumoylation, the identified sumoylation substrates are scarce and few of them correlate with liver cancer. In this report, we have found that PIASx α , PIASx β , and PIASy are highly expressed in liver as well as testis by tissue distribution studies. We thus aimed to identify any SUMO‐1 related proteins in liver cancer cells by two‐dimensional gel electrophoresis and mass spectrometry. Two up‐regulated proteins, heterogeneous nuclear ribonucleoprotein A2/B1 isoform B1 (hnRNP A2/B1 isoform B1) and uracil DNA glycosylase (UDG), have been identified in the EGFP‐SUMO‐1 over‐expressing HepG2 cells. The up‐regulation is suggested to be mediated via changes at the translational level or protection from degradation by western blotting and RT‐PCR. Copyright © 2009 John Wiley & Sons, Ltd.