Phosphatidylinositol 4-kinase beta (PI4KB) is one of four mammalian PI4K enzymes that phosphorylate phosphatidylinositol to generate phosphatidylinositol 4-phosphate (PI4P). It localizes at the Golgi and is essential for Golgi formation and function. PI4KB consists of two domains, a right-handed helical solenoid at the N-terminal, also referred to as accessory (PIK) domain, and a C-terminal kinase domain [1-3]. This entry represents the N-terminal PIK domain from mammalian PI4KB and the yeast orthologue Pik1 [1], which may be involved in substrate presentation.

1: Structures of PI4KIIIbeta complexes show simultaneous recruitment of Rab11 and its effectors. Burke JE, Inglis AJ, Perisic O, Masson GR, McLaughlin SH, Rutaganira F, Shokat KM, Williams RL; Science. 2014;344:1035-1038. PMID:24876499

2: Highly Selective Phosphatidylinositol 4-Kinase IIIbeta Inhibitors and Structural Insight into Their Mode of Action. Mejdrova I, Chalupska D, Kogler M, Sala M, Plackova P, Baumlova A, Hrebabecky H, Prochazkova E, Dejmek M, Guillon R, Strunin D, Weber J, Lee G, Birkus G, Mertlikova-Kaiserova H, Boura E, Nencka R; J Med Chem. 2015;58:3767-3793. PMID:25897704

3: Using hydrogen deuterium exchange mass spectrometry to engineer optimized constructs for crystallization of protein complexes: Case study of PI4KIIIbeta with Rab11. Fowler ML, McPhail JA, Jenkins ML, Masson GR, Rutaganira FU, Shokat KM, Williams RL, Burke JE; Protein Sci. 2016;25:826-839. PMID:26756197