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  • Title: Crystal structure of human protein kinase CK2: insights into basic properties of the CK2 holoenzyme.
    Author: Niefind K, Guerra B, Ermakowa I, Issinger OG.
    Journal: EMBO J; 2001 Oct 01; 20(19):5320-31. PubMed ID: 11574463.
    Abstract:
    The crystal structure of a fully active form of human protein kinase CK2 (casein kinase 2) consisting of two C-terminally truncated catalytic and two regulatory subunits has been determined at 3.1 A resolution. In the CK2 complex the regulatory subunits form a stable dimer linking the two catalytic subunits, which make no direct contact with one another. Each catalytic subunit interacts with both regulatory chains, predominantly via an extended C-terminal tail of the regulatory subunit. The CK2 structure is consistent with its constitutive activity and with a flexible role of the regulatory subunit as a docking partner for various protein kinases. Furthermore it shows an inter-domain mobility in the catalytic subunit known to be functionally important in protein kinases and detected here for the first time directly within one crystal structure.
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