Strategy for comprehensive identification of human N‐myristoylated proteins using an insect cell‐free protein synthesis system |
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Authors: | Takashi Suzuki Koko Moriya Kei Nagatoshi Yoshinobu Ota Toru Ezure Eiji Ando Susumu Tsunasawa Toshihiko Utsumi |
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Institution: | 1. Clinical and Biotechnology Business Unit, Shimadzu Corporation, Kyoto, Japan;2. These authors have contributed equally to this work.;3. Applied Molecular Bioscience, Graduate School of Medicine, Yamaguchi University, Yamaguchi, Japan;4. Institute for Protein Research, Osaka University, Osaka, Japan;5. Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi, Japan |
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Abstract: | To establish a strategy for the comprehensive identification of human N‐myristoylated proteins, the susceptibility of human cDNA clones to protein N‐myristoylation was evaluated by metabolic labeling and MS analyses of proteins expressed in an insect cell‐free protein synthesis system. One‐hundred‐and‐forty‐one cDNA clones with N‐terminal Met‐Gly motifs were selected as potential candidates from ~2000 Kazusa ORFeome project human cDNA clones, and their susceptibility to protein N‐myristoylation was evaluated using fusion proteins, in which the N‐terminal ten amino acid residues were fused to an epitope‐tagged model protein. As a result, the products of 29 out of 141 cDNA clones were found to be effectively N‐myristoylated. The metabolic labeling experiments both in an insect cell‐free protein synthesis system and in the transfected COS‐1 cells using full‐length cDNA revealed that 27 out of 29 proteins were in fact N‐myristoylated. Database searches with these 27 cDNA clones revealed that 18 out of 27 proteins are novel N‐myristoylated proteins that have not been reported previously to be N‐myristoylated, indicating that this strategy is useful for the comprehensive identification of human N‐myristoylated proteins from human cDNA resources. |
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Keywords: | Animal proteomics Comprehensive analysis Insect cell‐free protein synthesis system Metabolic labeling MS analysis Protein N‐myristoylation |
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