2CLQ

Structure of mitogen-activated protein kinase kinase kinase 5

Summary for 2CLQ

• Entry DOI: 10.2210/pdb2clq/pdb
• Descriptor: MITOGEN-ACTIVATED PROTEIN KINASE KINASE KINASE 5, STAUROSPORINE (3 entities in total)
• Functional Keywords: transferase, metal-binding, apoptosis
• Biological source: HOMO SAPIENS (HUMAN)
• Cellular location: Cytoplasm: Q99683
• Total number of polymer chains: 2
• Total formula weight: 67328.84

Authors

Bunkoczi, G.,Salah, E.,Fedorov, O.,Pike, A.,Gileadi, O.,von Delft, F.,Arrowsmith, C.,Edwards, A.,Sundstrom, M.,Weigelt, J.,Knapp, S. (deposition date: 2006-04-28, release date: 2006-05-09, Last modification date: 2024-05-01)

Primary citation

Bunkoczi, G.,Salah, E.,Filippakopoulos, P.,Fedorov, O.,Muller, S.,Sobott, F.,Parker, S.A.,Zhang, H.,Min, W.,Turk, B.E.,Knapp, S.
Structural and Functional Characterization of the Human Protein Kinase Ask1.
Structure, 15:1215-, 2007

PubMed Abstract: Apoptosis signal-regulating kinase 1 (ASK1) plays an essential role in stress and immune response and has been linked to the development of several diseases. Here, we present the structure of the human ASK1 catalytic domain in complex with staurosporine. Analytical ultracentrifugation (AUC) and crystallographic analysis showed that ASK1 forms a tight dimer (K(d) approximately 0.2 microM) interacting in a head-to-tail fashion. We found that the ASK1 phosphorylation motifs differ from known ASK1 phosphorylation sites but correspond well to autophosphorylation sites identified by mass spectrometry. Reporter gene assays showed that all three identified in vitro autophosphorylation sites (Thr813, Thr838, Thr842) regulate ASK1 signaling, but site-directed mutants showed catalytic activities similar to wild-type ASK1, suggesting a regulatory mechanism independent of ASK1 kinase activity. The determined high-resolution structure of ASK1 and identified ATP mimetic inhibitors will provide a first starting point for the further development of selective inhibitors.

PubMed: 17937911
DOI: 10.1016/J.STR.2007.08.011

Experimental method

X-RAY DIFFRACTION (2.3 Å)