2jog
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:2jog.jpg|left|200px]] | [[Image:2jog.jpg|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_2jog", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | + | or leave the SCENE parameter empty for the default display. | |
| - | + | --> | |
| - | + | {{STRUCTURE_2jog| PDB=2jog | SCENE= }} | |
| - | + | ||
| - | + | ||
| - | }} | + | |
'''Structure of the calcineurin-NFAT complex''' | '''Structure of the calcineurin-NFAT complex''' | ||
| Line 30: | Line 27: | ||
[[Category: Takeuchi, K.]] | [[Category: Takeuchi, K.]] | ||
[[Category: Wagner, G.]] | [[Category: Wagner, G.]] | ||
| - | [[Category: | + | [[Category: Calcineurin]] |
| - | [[Category: | + | [[Category: Complex structure]] |
| - | [[Category: | + | [[Category: Nfat]] |
| - | [[Category: | + | [[Category: Nuclear magnetic resonance]] |
| - | [[Category: | + | [[Category: Phosphatase]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 09:06:48 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 06:06, 4 May 2008
Structure of the calcineurin-NFAT complex
Overview
Calcineurin (Cn) is a serine/threonine protein phosphatase that plays pivotal roles in many physiological processes, including cell proliferation, development, and apoptosis. Most prominently, Cn targets the nuclear factors of activated T cell (NFATs), transcription factors that activate cytokine genes. Calcium-activated Cn dephosphorylates multiple residues within the regulatory domain of NFAT, triggering joint nuclear translocation. This relies crucially on the interaction between the catalytic domain of Cn (CnCat) and the conserved PxIxIT motif located in a region distinct from the dephosphorylation sites of NFAT. Here, we present the structure of the complex between the 39 kDa CnCat and a 14 residue peptide containing a PVIVIT segment that was derived from affinity-driven peptide selection based on the conserved PxIxIT motif of NFATs. The structure of the complex was determined by using NMR assignments and structural constraints and the coordinates of the CnCat crystal structure. The NMR analysis relied on recently developed labeling and spectroscopic techniques. The VIVIT peptide is accommodated in a hydrophobic cleft formed by beta strands 11 and 14, and the loop between beta strands 11 and 12, forming a short parallel beta sheet with the exposed beta strand 14 in Cn. The side chains of conserved residues in the PxIxIT sequences make extensive interactions with conserved residues in Cn, while those of nonconserved residues are solvent exposed. The architecture of the interface explains the diversity of recognition sequences compatible with NFAT function and uncovers a potential targeting site for immune-suppressive agents. The structure reveals that the orientation of the bound PxIxIT directs the phosphorylation sites in NFAT's regulatory domain toward the Cn catalytic site.
About this Structure
2JOG is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structure of the calcineurin-NFAT complex: defining a T cell activation switch using solution NMR and crystal coordinates., Takeuchi K, Roehrl MH, Sun ZY, Wagner G, Structure. 2007 May;15(5):587-97. PMID:17502104 Page seeded by OCA on Sun May 4 09:06:48 2008
