PDBsum entry 2oxd

Transferase

PDB id: 2oxd

Contents

Protein chain

325 a.a.

Ligands

K32

Waters ×79

References listed in PDB file

Key reference

• Title: The ATP-Binding site of protein kinase ck2 holds a positive electrostatic area and conserved water molecules.
• Authors: R.Battistutta, M.Mazzorana, L.Cendron, A.Bortolato, S.Sarno, Z.Kazimierczuk, G.Zanotti, S.Moro, L.A.Pinna.
• Ref.: Chembiochem, 2007, 8, 1804-1809. [DOI no: 10.1002/cbic.200700307]
• PubMed id: 17768728

Abstract

CK2 is a highly pleiotropic Ser/Thr protein kinase that is able to promote cell survival and enhance the tumour phenotype under specific circumstances. We have determined the crystal structure of three new complexes with tetrabromobenzimidazole derivatives that display K(i) values between 0.15 and 0.30 microM. A comparative analysis of these data with those of four other inhibitors of the same family revealed the presence of some highly conserved water molecules in the ATP-binding site. These waters reside near Lys68, in an area with a positive electrostatic potential that is able to attract and orient negatively charged ligands. The presence of this positive region and two unique bulky residues that are typical of CK2, Ile66 and Ile174, play a critical role in determining the ligand orientation and binding selectivity.