3p1o
Crystal structure of human 14-3-3 sigma in complex with TASK-3 peptide and stabilisator Fusicoccin A
Structural highlights
DiseaseKCNK9_HUMAN Intellectual deficit, Birk-Barel type. Birk-Barel mental retardation dysmorphism syndrome (BIBAS) [MIM:612292: A syndrome characterized by mental retardation, hypotonia, hyperactivity, and facial dysmorphism. Note=The disease is caused by mutations affecting the gene represented in this entry.[1] FunctionKCNK9_HUMAN pH-dependent, voltage-insensitive, background potassium channel protein.[2] [3] Publication Abstract from PubMedSmall-molecule stabilization of protein-protein interactions is an emerging field in chemical biology. We show how fusicoccanes, originally identified as fungal toxins acting on plants, promote the interaction of 14-3-3 proteins with the human potassium channel TASK-3 and present a semisynthetic fusicoccane derivative (FC-THF) that targets the 14-3-3 recognition motif (mode 3) in TASK-3. In the presence of FC-THF, the binding of 14-3-3 proteins to TASK-3 was increased 19-fold and protein crystallography provided the atomic details of the effects of FC-THF on this interaction. We also tested the functional effects of FC-THF on TASK channels heterologously expressed in Xenopus oocytes. Incubation with 10 muM FC-THF was found to promote the transport of TASK channels to the cell membrane, leading to a significantly higher density of channels at the surface membrane and increased potassium current. A semisynthetic fusicoccane stabilizes a protein-protein interaction and enhances the expression of k(+) channels at the cell surface.,Anders C, Higuchi Y, Koschinsky K, Bartel M, Schumacher B, Thiel P, Nitta H, Preisig-Muller R, Schlichthorl G, Renigunta V, Ohkanda J, Daut J, Kato N, Ottmann C Chem Biol. 2013 Apr 18;20(4):583-93. doi: 10.1016/j.chembiol.2013.03.015. PMID:23601647[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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