title: Structural basis for the interaction of TAK1 kinase with its activating protein TAB1.
abstract: Transforming growth factor-beta (TGF-beta)-activated kinase 1 (TAK1) is a member of the MAPKKK family of protein kinases, and is involved in intracellular signalling pathways stimulated by transforming growth factor beta, interleukin-1 and tumour necrosis factor-alpha. TAK1 is known to rely upon an additional protein, TAK1-binding protein 1 (TAB1), for complete activation. However, the molecular basis for this activation has yet to be elucidated. We have solved the crystal structure of a novel TAK1 chimeric protein and these data give insight into how TAK1 is activated by TAB1. Our results reveal a novel binding pocket on the TAK1 kinase domain whose shape complements that of a unique alpha-helix in the TAK1 binding domain of TAB1, providing the basis for an intimate hydrophobic association between the protein activator and its target.
authors.affiliation: Vertex Pharmaceuticals (Europe) Ltd, 88 Milton Park, Abingdon, Oxfordshire OX14 4RY, UK.
authors.forename: Kieron
authors.initials: K
authors.lastname: Brown
authors.forename: Sarah C M
authors.initials: SC
authors.lastname: Vial
authors.forename: Neesha
authors.initials: N
authors.lastname: Dedi
authors.forename: Joanna M
authors.initials: JM
authors.lastname: Long
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Dunster
authors.forename: Graham M T
authors.initials: GM
authors.lastname: Cheetham
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D000241:Adenosine / Q000378:metabolism; D000595:Amino Acid Sequence; D016367:Baculoviridae / Q000235:genetics; D001665:Binding Sites; D018360:Crystallography, X-Ray; D004789:Enzyme Activation; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D007700:Kinetics; D020930:MAP Kinase Kinase Kinases / Q000737:chemistry* / Q000378:metabolism*; D013058:Mass Spectrometry; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011485:Protein Binding; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D000099151:MAP Kinase Kinase Kinase 7
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D000241:Adenosine; D020930:MAP Kinase Kinase Kinases; D011993:Recombinant Fusion Proteins; D000099151:MAP Kinase Kinase Kinase 7; C486300:TAB1 protein, human