Crystal structures of catalytic and regulatory subunits of rat protein kinase CK2 |
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Authors: | WeiHong Zhou XiaoHong Qin XiaoJie Yan XingQiao Xie Liang Li ShaSha Fang JiaFu Long John Adelman Wei-Jen Tang YueQuan Shen |
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Institution: | (1) Tianjin Key Laboratory of Protein Science, College of Life Sciences, Nankai University, Tianjin, 300071, China;(2) Vollum Institute, Oregon Health and Science University, Portland, 97239, USA;(3) Ben May Institute for Cancer Research, the University of Chicago, Chicago, 60637, USA |
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Abstract: | Protein kinase CK2 consists of two catalytic subunits (CK2α) and two regulatory subunits (CK2β). Here, we report the crystal
structures of rat CK2α mutant (rCK2α-ΔC, 1–335) and CK2β (rCK2β). The overall topology of rCK2α-ΔC and rCK2β are very similar
to the human enzyme, although large structural differences could be observed in the N-terminal domain of rCK2α-ΔC. Our reported
structure of rCK2α-ΔC is in the close conformation state while the counterpart hCK2α is in the open conformation state, indicating
the conformation of CK2α molecule has high plasticity. The structure of rCK2β represents the conformation of free CK2β. Upon
CK2α binding, the C-terminal region undergoes a drastic conformational change. The major region of interaction within the
interface of CK2α/CK2β may serve as a bridge to transmit the conformational change and thus regulate the activity of CK2α.
Supported by Tianjin Basic Research Program (Grant No. 07JCYBJC15600), National Natural Science Foundation of China (Grant
No. 30770428), National Key Basic Research and Development Program of China (Grant Nos. 2007CB914301, 2006CB910200), National
High-Technology Research and Development Program of China (Grant No. 2006AA02A319) and National Institute of Health (Grant
No. MH07752) |
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Keywords: | protein kinase CK2 casein kinase II catalytic subunit regulatory subunit CK2β regulation |
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