2v3s
From Proteopedia
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==Overview== | ==Overview== | ||
| - | The oxidative-stress-responsive kinase 1 (OSR1) and the STE20/SPS1-related | + | The oxidative-stress-responsive kinase 1 (OSR1) and the STE20/SPS1-related proline/alanine-rich kinase (SPAK) are key enzymes in a signalling cascade regulating the activity of Na(+)/K(+)/2Cl(-) co-transporters (NKCCs) in response to osmotic stress. Both kinases have a conserved carboxy-terminal (CCT) domain, which recognizes a unique peptide (Arg-Phe-Xaa-Val) motif present in OSR1- and SPAK-activating kinases (with-no-lysine kinase 1 (WNK1) and WNK4) as well as its substrates (NKCC1 and NKCC2). Here, we describe the structural basis of this recognition event as shown by the crystal structure of the CCT domain of OSR1 in complex with a peptide containing this motif, derived from WNK4. The CCT domain forms a novel protein fold that interacts with the Arg-Phe-Xaa-Val motif through a surface-exposed groove. An intricate web of interactions is observed between the CCT domain and an Arg-Phe-Xaa-Val motif-containing peptide derived from WNK4. Mutational analysis shows that these interactions are required for the CCT domain to bind to WNK1 and NKCC1. The CCT domain structure also shows how phosphorylation of a Ser/Thr residue preceding the Arg-Phe-Xaa-Val motif results in a steric clash, promoting its dissociation from the CCT domain. These results provide the first molecular insight into the mechanism by which the SPAK and OSR1 kinases specifically recognize their upstream activators and downstream substrates. |
==Disease== | ==Disease== | ||
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[[Category: Non-specific serine/threonine protein kinase]] | [[Category: Non-specific serine/threonine protein kinase]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
| - | [[Category: Aalten, D | + | [[Category: Aalten, D M.F Van.]] |
| - | [[Category: Alessi, D | + | [[Category: Alessi, D R.]] |
[[Category: Deak, M.]] | [[Category: Deak, M.]] | ||
[[Category: Goebel, J.]] | [[Category: Goebel, J.]] | ||
| - | [[Category: Rafiqi, F | + | [[Category: Rafiqi, F H.]] |
[[Category: Thastrup, J.]] | [[Category: Thastrup, J.]] | ||
[[Category: Villa, F.]] | [[Category: Villa, F.]] | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 18:53:00 2008'' |
Revision as of 16:53, 21 February 2008
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STRUCTURAL INSIGHTS INTO THE RECOGNITION OF SUBSTRATES AND ACTIVATORS BY THE OSR1 KINASE
Contents |
Overview
The oxidative-stress-responsive kinase 1 (OSR1) and the STE20/SPS1-related proline/alanine-rich kinase (SPAK) are key enzymes in a signalling cascade regulating the activity of Na(+)/K(+)/2Cl(-) co-transporters (NKCCs) in response to osmotic stress. Both kinases have a conserved carboxy-terminal (CCT) domain, which recognizes a unique peptide (Arg-Phe-Xaa-Val) motif present in OSR1- and SPAK-activating kinases (with-no-lysine kinase 1 (WNK1) and WNK4) as well as its substrates (NKCC1 and NKCC2). Here, we describe the structural basis of this recognition event as shown by the crystal structure of the CCT domain of OSR1 in complex with a peptide containing this motif, derived from WNK4. The CCT domain forms a novel protein fold that interacts with the Arg-Phe-Xaa-Val motif through a surface-exposed groove. An intricate web of interactions is observed between the CCT domain and an Arg-Phe-Xaa-Val motif-containing peptide derived from WNK4. Mutational analysis shows that these interactions are required for the CCT domain to bind to WNK1 and NKCC1. The CCT domain structure also shows how phosphorylation of a Ser/Thr residue preceding the Arg-Phe-Xaa-Val motif results in a steric clash, promoting its dissociation from the CCT domain. These results provide the first molecular insight into the mechanism by which the SPAK and OSR1 kinases specifically recognize their upstream activators and downstream substrates.
Disease
Known diseases associated with this structure: Pseudohypoaldosteronism type II OMIM:[601844]
About this Structure
2V3S is a Protein complex structure of sequences from Homo sapiens with as ligand. Active as Non-specific serine/threonine protein kinase, with EC number 2.7.11.1 Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Structural insights into the recognition of substrates and activators by the OSR1 kinase., Villa F, Goebel J, Rafiqi FH, Deak M, Thastrup J, Alessi DR, van Aalten DM, EMBO Rep. 2007 Sep;8(9):839-45. Epub 2007 Aug 17. PMID:17721439
Page seeded by OCA on Thu Feb 21 18:53:00 2008
Categories: Homo sapiens | Non-specific serine/threonine protein kinase | Protein complex | Aalten, D M.F Van. | Alessi, D R. | Deak, M. | Goebel, J. | Rafiqi, F H. | Thastrup, J. | Villa, F. | ACT | Atp-binding | Kinase | Magnesium | Metal-binding | Nucleotide-binding | Phosphorylation | Polymorphism | Serine/threonine-protein kinase | Transferase
