2PVR

Crystal structure of the catalytic subunit of protein kinase CK2 (C-terminal deletion mutant 1-335) in complex with two sulfate ions

Summary for 2PVR

• Entry DOI: 10.2210/pdb2pvr/pdb
• Related: 1DAY 1JWH 1LP4 1LPU 1PJK 1YMI
• Descriptor: Casein kinase II subunit alpha, catalytic subunit, SULFATE ION, PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER, ... (4 entities in total)
• Functional Keywords: eukaryotic protein kinase fold, cmgc kinases, signaling protein, transferase
• Biological source: Homo sapiens (human)
• Cellular location: Nucleus : P68400
• Total number of polymer chains: 1
• Total formula weight: 40633.87

Authors

Niefind, K.,Yde, C.W.,Ermakova, I.,Issinger, O.-G. (deposition date: 2007-05-10, release date: 2007-06-26, Last modification date: 2023-08-30)

Primary citation

Niefind, K.,Yde, C.W.,Ermakova, I.,Issinger, O.G.
Evolved to Be Active: Sulfate Ions Define Substrate Recognition Sites of CK2alpha and Emphasise its Exceptional Role within the CMGC Family of Eukaryotic Protein Kinases
J.Mol.Biol., 370:427-438, 2007

PubMed Abstract: CK2alpha is the catalytic subunit of protein kinase CK2 and a member of the CMGC family of eukaryotic protein kinases like the cyclin-dependent kinases, the MAP kinases and glycogen-synthase kinase 3. We present here a 1.6 A resolution crystal structure of a fully active C-terminal deletion mutant of human CK2alpha liganded by two sulfate ions, and we compare this structure systematically with representative structures of related CMGC kinases. The two sulfate anions occupy binding pockets at the activation segment and provide the structural basis of the acidic consensus sequence S/T-D/E-X-D/E that governs substrate recognition by CK2. The anion binding sites are conserved among those CMGC kinases. In most cases they are neutralized by phosphorylation of a neighbouring threonine or tyrosine side-chain, which triggers conformational changes for regulatory purposes. CK2alpha, however, lacks both phosphorylation sites at the activation segment and structural plasticity. Here the anion binding sites are functionally changed from regulation to substrate recognition. These findings underline the exceptional role of CK2alpha as a constitutively active enzyme within a family of strictly controlled protein kinases.

PubMed: 17524418
DOI: 10.1016/j.jmb.2007.04.068

Experimental method

X-RAY DIFFRACTION (1.605 Å)