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1phk

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[[Image:1phk.jpg|left|200px]]<br /><applet load="1phk" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1phk, resolution 2.2&Aring;" />
 
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'''TWO STRUCTURES OF THE CATALYTIC DOMAIN OF PHOSPHORYLASE, KINASE: AN ACTIVE PROTEIN KINASE COMPLEXED WITH NUCLEOTIDE, SUBSTRATE-ANALOGUE AND PRODUCT'''<br />
 
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==Overview==
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==TWO STRUCTURES OF THE CATALYTIC DOMAIN OF PHOSPHORYLASE, KINASE: AN ACTIVE PROTEIN KINASE COMPLEXED WITH NUCLEOTIDE, SUBSTRATE-ANALOGUE AND PRODUCT==
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BACKGROUND: Control of intracellular events by protein phosphorylation is promoted by specific protein kinases. All the known protein kinase possess a common structure that defines a catalytically competent entity termed the 'kinase catalytic core'. Within this common structural framework each kinase displays its own unique substrate specificity, and a regulatory mechanism that may be modulated by association with other proteins. Structural studies of phosphorylase kinase (Phk), the major substrate of which is glycogen phosphorylase, may be expected to shed light on its regulation. RESULTS: We report two crystal structures of the catalytic core (residues 1-298; Phk gamma trnc) of the gamma-subunit of rabbit muscle phosphorylase kinase: the binary complex with Mn2+/beta-gamma-imidoadenosine 5'-triphosphate (AMPPNP) to a resolution of 2.6 A and the binary complex with Mg2+/ADP to a resolution of 3.0 A. The structures were solved by molecular replacement using the cAMP-dependent protein kinase (cAPK) as a model. CONCLUSIONS: The overall structure of Phk gamma trnc is similar to that of the catalytic core of other protein kinases. It consists of two domians joined on one edge by a 'hinge', with the catalytic site located in the cleft between the domains. Phk gamma trnc is constitutively active, and lacks the need for an activatory phosphorylation event that is essential for many kinases. The structure exhibits an essentially 'closed' conformation of the domains which is similar to that of cAPK complexed with substrates. The phosphorylated residue that is located at the domain interface in many protein kinases and that is believed to stabilize an active conformation is substituted by a glutamate in Phk gamma trnc. The glutamate, in a similar manner to the phosphorylated residue in other protein kinases, interacts with an arginine adjacent to the catalytic aspartate but does not participate in interdomain contacts. The interactions between the enzyme and the nucleotide product of its activity, Mg2+/ADP, explain the inhibitory properties of the nucleotides that are observed in kinetic studies.
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<StructureSection load='1phk' size='340' side='right'caption='[[1phk]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[1phk]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PHK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PHK FirstGlance]. <br>
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1PHK is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus] with <scene name='pdbligand=MN:'>MN</scene> and <scene name='pdbligand=ATP:'>ATP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Phosphorylase_kinase Phosphorylase kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.11.19 2.7.11.19] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PHK OCA].
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene></td></tr>
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==Reference==
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1phk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1phk OCA], [https://pdbe.org/1phk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1phk RCSB], [https://www.ebi.ac.uk/pdbsum/1phk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1phk ProSAT]</span></td></tr>
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Two structures of the catalytic domain of phosphorylase kinase: an active protein kinase complexed with substrate analogue and product., Owen DJ, Noble ME, Garman EF, Papageorgiou AC, Johnson LN, Structure. 1995 May 15;3(5):467-82. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=7663944 7663944]
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/PHKG1_RABIT PHKG1_RABIT] Catalytic subunit of the phosphorylase b kinase (PHK), which mediates the neural and hormonal regulation of glycogen breakdown (glycogenolysis) by phosphorylating and thereby activating glycogen phosphorylase. In vitro, phosphorylates PYGM, TNNI3, MAPT/TAU, GAP43 and NRGN/RC3.<ref>PMID:8454596</ref> <ref>PMID:8999860</ref>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ph/1phk_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1phk ConSurf].
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<div style="clear:both"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Large Structures]]
[[Category: Oryctolagus cuniculus]]
[[Category: Oryctolagus cuniculus]]
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[[Category: Phosphorylase kinase]]
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[[Category: Garman EF]]
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[[Category: Single protein]]
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[[Category: Johnson LN]]
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[[Category: Garman, E F.]]
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[[Category: Noble MEM]]
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[[Category: Johnson, L N.]]
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[[Category: Owen DJ]]
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[[Category: Noble, M E.M.]]
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[[Category: Papageorgiou AC]]
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[[Category: Owen, D J.]]
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[[Category: Papageorgiou, A C.]]
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[[Category: ATP]]
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[[Category: MN]]
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[[Category: atp-binding]]
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[[Category: calmodulin-binding]]
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[[Category: glycogen metabolism]]
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[[Category: kinase]]
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[[Category: serine/threonine-protein]]
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[[Category: transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:28:59 2008''
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Current revision

TWO STRUCTURES OF THE CATALYTIC DOMAIN OF PHOSPHORYLASE, KINASE: AN ACTIVE PROTEIN KINASE COMPLEXED WITH NUCLEOTIDE, SUBSTRATE-ANALOGUE AND PRODUCT

PDB ID 1phk

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