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[[Image:1mxe.gif|left|200px]]<br /><applet load="1mxe" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1mxe, resolution 1.70&Aring;" />
'''Structure of the Complex of Calmodulin with the Target Sequence of CaMKI'''<br />


==Overview==
==Structure of the Complex of Calmodulin with the Target Sequence of CaMKI==
Calcium-saturated calmodulin (CaM) directly activates CaM-dependent protein kinase I (CaMKI) by binding to a region in the C-terminal regulatory sequence of the enzyme to relieve autoinhibition. The structure of CaM in a high-affinity complex with a 25-residue peptide of CaMKI (residues 294-318) has been determined by X-ray crystallography at 1.7 A resolution. Upon complex formation, the CaMKI peptide adopts an alpha-helical conformation, while changes in the CaM domain linker enable both its N- and C-domains to wrap around the peptide helix. Target peptide residues Trp-303 (interacting with the CaM C-domain) and Met-316 (with the CaM N-domain) define the mode of binding as 1-14. In addition, two basic patches on the peptide form complementary charge interactions with CaM. The CaM-peptide affinity is approximately 1 pM, compared with 30 nM for the CaM-kinase complex, indicating that activation of autoinhibited CaMKI by CaM requires a costly energetic disruption of the interactions between the CaM-binding sequence and the rest of the enzyme. We present biochemical and structural evidence indicating the involvement of both CaM domains in the activation process: while the C-domain exhibits tight binding toward the regulatory sequence, the N-domain is necessary for activation. Our crystal structure also enables us to identify the full CaM-binding sequence. Residues Lys-296 and Phe-298 from the target peptide interact directly with CaM, demonstrating overlap between the autoinhibitory and CaM-binding sequences. Thus, the kinase activation mechanism involves the binding of CaM to residues associated with the inhibitory pseudosubstrate sequence.
<StructureSection load='1mxe' size='340' side='right'caption='[[1mxe]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1mxe]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Drosophila_melanogaster Drosophila melanogaster] and [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MXE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MXE FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1mxe FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mxe OCA], [https://pdbe.org/1mxe PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mxe RCSB], [https://www.ebi.ac.uk/pdbsum/1mxe PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mxe ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CALM_DROME CALM_DROME] Calmodulin mediates the control of a large number of enzymes, ion channels and other proteins by Ca(2+). Among the enzymes to be stimulated by the calmodulin-Ca(2+) complex are a number of protein kinases and phosphatases.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/mx/1mxe_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1mxe ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1MXE is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Drosophila_melanogaster Drosophila melanogaster] with <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Calcium/calmodulin-dependent_protein_kinase Calcium/calmodulin-dependent protein kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.11.17 2.7.11.17] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MXE OCA].
*[[Calmodulin 3D structures|Calmodulin 3D structures]]
 
__TOC__
==Reference==
</StructureSection>
Structure of the complex of calmodulin with the target sequence of calmodulin-dependent protein kinase I: studies of the kinase activation mechanism., Clapperton JA, Martin SR, Smerdon SJ, Gamblin SJ, Bayley PM, Biochemistry. 2002 Dec 17;41(50):14669-79. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12475216 12475216]
[[Category: Calcium/calmodulin-dependent protein kinase]]
[[Category: Drosophila melanogaster]]
[[Category: Drosophila melanogaster]]
[[Category: Protein complex]]
[[Category: Large Structures]]
[[Category: Bayley, P M.]]
[[Category: Rattus norvegicus]]
[[Category: Clapperton, J A.]]
[[Category: Bayley PM]]
[[Category: Gamblin, S J.]]
[[Category: Clapperton JA]]
[[Category: Martin, S R.]]
[[Category: Gamblin SJ]]
[[Category: Smerdon, S J.]]
[[Category: Martin SR]]
[[Category: CA]]
[[Category: Smerdon SJ]]
[[Category: calmodulin]]
[[Category: calmodulin-pepide complex]]
[[Category: camki]]
[[Category: xray]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:00:02 2008''

Latest revision as of 10:49, 14 February 2024

Structure of the Complex of Calmodulin with the Target Sequence of CaMKIStructure of the Complex of Calmodulin with the Target Sequence of CaMKI

Structural highlights

1mxe is a 4 chain structure with sequence from Drosophila melanogaster and Rattus norvegicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.7Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CALM_DROME Calmodulin mediates the control of a large number of enzymes, ion channels and other proteins by Ca(2+). Among the enzymes to be stimulated by the calmodulin-Ca(2+) complex are a number of protein kinases and phosphatases.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

1mxe, resolution 1.70Å

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