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- W2469980905 abstract "// YongJoong Kim 1 , Min Seon Lee 1 , Hag Dong Kim 1 , Joon Kim 1 1 Laboratory of Biochemistry, Division of Life Sciences, Korea University, Seoul 02841, Republic of Korea Correspondence to: Joon Kim, email: joonkim@korea.ac.kr Keywords: glycosylation, secretion, ribosomal protein S3, ribosome Received: February 16, 2015 Accepted: February 18, 2016 Published: June 22, 2016 ABSTRACT Ribosomal protein S3 (rpS3) is a 243 amino acid component of the 40S ribosomal small subunit. It has multiple roles in translation and extra-ribosomal functions like apoptosis and DNA repair. RpS3 is secreted only in cancer cell lines. Presently, mass spectrometry analysis revealed rpS3 to be glycosylated at the Asn165 residue. A point mutation at this residue decreased secretion of rpS3 in cancer cell lines. Secretion was also inhibited by the endoplasmic reticulum (ER)-Golgi transport inhibitor Brefeldin A and by Tunicamycin, an inhibitor of N-linked glycosylation. N-linked glycosylation of rpS3 was confirmed as necessary for rpS3 secretion into culture media via the ER-Golgi dependent pathway. RpS3 bound to Concanavalin A, a carbohydrate binding lectin protein, while treatment with peptide-N-glycosidase F shifted the secreted rpS3 to a lower molecular weight band. In addition, the N165G mutant of rpS3 displayed reduced secretion compared to the wild-type. An in vitro binding assay detected rpS3 homodimer formation via the N-terminal region (rpS3:1–85) and a middle region (rpS3:95–158). The results indicate that the Asn 165 residue of rpS3 is a critical site for N-linked glycosylation and passage through the ER-Golgi secretion pathway." @default.
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- W2469980905 date "2016-06-22" @default.
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- W2469980905 title "Ribosomal protein S3 (rpS3) secreted from various cancer cells is N-linked glycosylated" @default.
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- W2469980905 doi "https://doi.org/10.18632/oncotarget.10180" @default.
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