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In vivo putative O-GlcNAcylation of human SCP1 and evidence for possible role of its N-terminal disordered structure
Authors:JaeHyung Koo  Young Yil Bahk
Institution:1.Department of Brain Science, Daegu-Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Korea;2.Department of Biotechnology, Konkuk University, Chungju 380-701, Korea
Abstract:RNA polymerase II carboxyl-terminal domain (RNAPII CTD) phosphatases are responsible for the dephosphorylation of the C-terminal domain of the small subunit of RNAPII in eukaryotes. Recently, we demonstrated the identification of several interacting partners with human small CTD phosphatase1 (hSCP1) and the substrate specificity to delineate an appearance of the dephosphorylation catalyzed by SCP1. In this study, using the established cells for inducibly expressing hSCP1 proteins, we monitored the modification of β-O-linked N-acetylglucosamine (O-GlcNAc). O-GlcNAcylation is one of the most common post-translational modifications (PTMs). To gain insight into the PTM of hSCP1, we used the Western blot, immunoprecipitation, succinylayed wheat germ agglutininprecipitation, liquid chromatography-mass spectrometry analyses, and site-directed mutagenesis and identified the Ser41 residue of hSCP1 as the O-GlcNAc modification site. These results suggest that hSCP1 may be an O-GlcNAcylated protein in vivo, and its N-terminus may function a possible role in the PTM, providing a scaffold for binding the protein(s). BMB Reports 2014; 47(10): 593-598]
Keywords:CTD phosphatase SCP1  Inducible mammalian expression system  O-GlcNAc  Post-translational modification
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