5euq
From Proteopedia
Crystal structure of an engineered construct of phosphatidylinositol 4 kinase III beta with a potent and selective inhibitor in complex with GDP loaded Rab11
Structural highlights
Function[RB11A_HUMAN] The small GTPases Rab are key regulators of intracellular membrane trafficking, from the formation of transport vesicles to their fusion with membranes. Rabs cycle between an inactive GDP-bound form and an active GTP-bound form that is able to recruit to membranes different set of downstream effectors directly responsible for vesicle formation, movement, tethering and fusion. That Rab regulates endocytic recycling. Acts as a major regulator of membrane delivery during cytokinesis. Together with MYO5B and RAB8A participates in epithelial cell polarization. Together with RAB3IP, RAB8A, the exocyst complex, PARD3, PRKCI, ANXA2, CDC42 and DNMBP promotes transcytosis of PODXL to the apical membrane initiation sites (AMIS), apical surface formation and lumenogenesis. Together with MYO5B participates in CFTR trafficking to the plasma membrane and TF (Transferrin) recycling in nonpolarized cells. Required in a complex with MYO5B and RAB11FIP2 for the transport of NPC1L1 to the plasma membrane. Participates in the sorting and basolateral transport of CDH1 from the Golgi apparatus to the plasma membrane. Regulates the recycling of FCGRT (receptor of Fc region of monomeric Ig G) to basolateral membranes. May also play a role in melanosome transport and release from melanocytes.[1] [2] [3] [4] [5] [6] [PI4KB_HUMAN] Phosphorylates phosphatidylinositol (PI) in the first committed step in the production of the second messenger inositol-1,4,5,-trisphosphate (PIP). May regulate Golgi disintegration/reorganization during mitosis, possibly via its phosphorylation. Involved in Golgi-to-plasma membrane trafficking (By similarity).[7] [8] [9] Publication Abstract from PubMedType III Phosphatidylinositol 4-kinase (PI4KIIIbeta) is an essential enzyme in mediating membrane trafficking, and is implicated in a variety of pathogenic processes. It is a key host factor mediating replication of RNA viruses. The design of potent and specific inhibitors of this enzyme will be essential to define its cellular roles, and may lead to novel anti-viral therapeutics. We previously reported the PI4K inhibitor PIK93, and this compound has defined key functions of PI4KIIIbeta. However, this compound showed high cross reactivity with class I and III PI3Ks. Using structure-based drug design we have designed novel potent and selective (>1000 fold over class I and class III PI3Ks) PI4KIIIbeta inhibitors. These compounds showed anti-viral activity against Hepatitis C Virus. The co-crystal structure of PI4KIIIbeta bound to one of the most potent compounds reveals the molecular basis of specificity. This work will be vital in the design of novel PI4KIIIbeta inhibitors, which may play significant roles as anti-viral therapeutics. Design and structural characterization of potent and selective inhibitors of phosphatidylinositol 4 kinase IIIbeta.,Rutaganira FU, Fowler ML, McPhail JA, Gelman MA, Nguyen K, Xiong A, Dornan GL, Tavshanjian B, Glenn JS, Shokat KM, Burke JE J Med Chem. 2016 Feb 17. PMID:26885694[10] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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