View source for 4dg0


==Crystal structure of myristoylated WT catalytic subunit of cAMP-dependent protein kinase in complex with SP20 and AMP-PNP==
<StructureSection load='4dg0' size='340' side='right'caption='[[4dg0]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4dg0]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4DG0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4DG0 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]] 2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=MYR:MYRISTIC+ACID'>MYR</scene>, <scene name='pdbligand=SEP:PHOSPHOSERINE'>SEP</scene>, <scene name='pdbligand=TPO:PHOSPHOTHREONINE'>TPO</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=4dg0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4dg0 OCA], [https://pdbe.org/4dg0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4dg0 RCSB], [https://www.ebi.ac.uk/pdbsum/4dg0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4dg0 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/IPKA_MOUSE IPKA_MOUSE] Extremely potent competitive inhibitor of cAMP-dependent protein kinase activity, this protein interacts with the catalytic subunit of the enzyme after the cAMP-induced dissociation of its regulatory chains.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The catalytic (C) subunit of cAMP-dependent protein kinase [protein kinase A (PKA)] is a major target of cAMP signaling, and its regulation is of fundamental importance to biological processes. One mode of regulation is N-myristylation, which has eluded structural and functional characterization so far because most crystal structures are of the non-myristylated enzyme, are phosphorylated on Ser10, and generally lack electron density for the first 13 residues. We crystallized myristylated wild-type (WT) PKA and a K7C mutant as binary (bound to a substrate peptide) and ternary [bound to a substrate peptide and adenosine-5'-(beta,gamma-imido)triphosphate] complexes. There was clear electron density for the entire N-terminus in the binary complexes, both refined to 2.0 A, and K7C ternary complex, refined to 1.35 A. The N-termini in these three structures display a novel conformation with a previously unseen helix from residues 1 to 7. The K7C mutant appears to have a more stable N-terminus, and this correlated with a significant decrease in the B-factors for the N-terminus in the myr-K7C complexes compared to the WT binary complex. The N-terminus of the myristylated WT ternary complex, refined to 2.0 A, was disordered as in previous structures. In addition to a more ordered N-terminus, the myristylated K7C mutant exhibited a 53% increase in k(cat). The effect of nucleotide binding on the structure of the N-terminus in the WT protein and the kinetic changes in the K7C protein suggest that myristylation or occupancy of the myristyl binding pocket may serve as a site for allosteric regulation in the C-subunit.

Role of N-Terminal Myristylation in the Structure and Regulation of cAMP-Dependent Protein Kinase.,Bastidas AC, Deal MS, Steichen JM, Keshwani MM, Guo Y, Taylor SS J Mol Biol. 2012 May 19. PMID:22617327<ref>PMID:22617327</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 4dg0" style="background-color:#fffaf0;"></div>

==See Also==
*[[CAMP-dependent protein kinase 3D structures|CAMP-dependent protein kinase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Bastidas AC]]
[[Category: Steichen JM]]
[[Category: Taylor SS]]