Phosphorylation of CLK2 at Serine 34 and Threonine 127 by AKT Controls Cell Survival after Ionizing Radiation |
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Authors: | Seon Young Nam Hyung Ho Seo Hyung Sun Park Sungkwan An Ji-Young Kim Kwang Hee Yang Cha Soon Kim Meeseon Jeong Young-Woo Jin |
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Affiliation: | From the ‡Radiation Health Research Institute, Korea Hydro & Nuclear Power Co., Ltd., Seoul 132-703 and ;the §Functional Genoproteome Research Centre, Konkuk University, Seoul 143-701, Korea |
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Abstract: | AKT phosphorylates components of the intrinsic cell survival machinery and promotes survival to various stimuli. In the present study, we identified CDC-like kinase 2 (CLK2) as a new substrate of AKT activation and elucidated its role in cell survival to ionizing radiation. AKT directly binds to and phosphorylates CLK2 on serine 34 and threonine 127, in vitro and in vivo. CLK2 phosphorylation was detected in HeLa cells overexpressing active AKT. In addition, we demonstrated that ionizing radiation induces CLK2 phosphorylation via AKT activation. In contrast, the suppression of endogenous AKT expression by siRNA inhibited CLK2 phosphorylation in response to 2 gray of γ-ray or insulin. Furthermore, we examined the effect of CLK2 on the survival of irradiated CCD-18Lu cells overexpressing Myc-CLK2. CLK2 overexpression significantly increased cell growth and inhibited cell death induced by 2 gray. The role of CLK2 in cell survival to ionizing radiation was dependent on the phosphorylation of serine 34 and threonine 127. Our results suggest that AKT activation controls cell survival to ionizing radiation by phosphorylating CLK2, revealing an important regulatory mechanism required for promoting cell survival. |
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Keywords: | Akt PKB Cell Death Gene Regulation Insulin Protein Phosphorylation CLK2 Cell Survival Ionizing Radiation |
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