Volume 14, Issue 9 p. 1020-1030
Research Article

Global identification of O-GlcNAc transferase (OGT) interactors by a human proteome microarray and the construction of an OGT interactome

Rui-Ping Deng

Rui-Ping Deng

Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai, P. R. China

State Key Laboratory of Oncogenes and Related Genes, Shanghai, P. R. China

These two authors contributed equally to this study.

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Xiang He

Xiang He

Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai, P. R. China

State Key Laboratory of Oncogenes and Related Genes, Shanghai, P. R. China

These two authors contributed equally to this study.

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Shu-Juan Guo

Shu-Juan Guo

Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai, P. R. China

State Key Laboratory of Oncogenes and Related Genes, Shanghai, P. R. China

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Wei-Feng Liu

Wei-Feng Liu

CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Chinese Academy of Sciences, Beijing, P. R. China

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Yong Tao

Yong Tao

CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Chinese Academy of Sciences, Beijing, P. R. China

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Sheng-Ce Tao

Corresponding Author

Sheng-Ce Tao

Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai, P. R. China

State Key Laboratory of Oncogenes and Related Genes, Shanghai, P. R. China

School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, P. R. China

Correspondence: Professor Sheng-Ce Tao, Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

E-mail:[email protected]

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First published: 17 February 2014
Citations: 30

Colour Online: See the article online to view Figs. 2, 3 and 5 in colour.

Abstract

O-Linked β-N-acetylglucosamine (O-GlcNAcylation) is an important protein PTM, which is very abundant in mammalian cells. O-GlcNAcylation is catalyzed by O-GlcNAc transferase (OGT), whose substrate specificity is believed to be regulated through interactions with other proteins. There are a handful of known human OGT interactors, which is far from enough for fully elucidating the substrate specificity of OGT. To address this challenge, we used a human proteome microarray containing ∼17 000 affinity-purified human proteins to globally identify OGT interactors and identified 25 OGT-binding proteins. Bioinformatics analysis showed that these interacting proteins play a variety of roles in a wide range of cellular functions and are highly enriched in intra-Golgi vesicle-mediated transport and vitamin biosynthetic processes. Combining newly identified OGT interactors with the interactors identified prior to this study, we have constructed the first OGT interactome. Bioinformatics analysis suggests that the OGT interactome plays important roles in protein transportation/localization and transcriptional regulation. The novel OGT interactors that we identified in this study could serve as a starting point for further functional analysis. Because of its high-throughput and parallel analysis capability, we strongly believe that protein microarrays could be easily applied for the global identification of regulators for other key enzymes.