4aqk

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(Difference between revisions)

Revision as of 09:37, 5 August 2016

Inositol 1,3,4,5,6-pentakisphosphate 2-kinase in complex with ADP and IP6

Structural highlights

4aqk is a 1 chain structure with sequence from Arath. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, , ,
Related:	2xal, 2xam, 2xan, 2xao, 2xar
Activity:	Inositol-pentakisphosphate 2-kinase, with EC number 2.7.1.158
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[IPPK_ARATH] Phosphorylates Ins(1,3,4,5,6)P5 at position 2 to form Ins(1,2,3,4,5,6)P6 (InsP6 or phytate). Phytate is a regulator of intracellular signaling, a highly abundant animal antinutrient, and a phosphate store in plant seeds. Also phosphorylates Ins(1,3,4,6)P4 and Ins(1,4,5,6)P4 to produce Ins(1,2,3,4,6)P5 and Ins(1,2,4,5,6)P5.^[1] ^[2]

Publication Abstract from PubMed

Inositol 1,3,4,5,6-pentakisphosphate 2-kinase (IP(5) 2-K) is a key enzyme that catalyzes the synthesis of phytic acid (IP(6)) from inositol 1,3,4,5,6-pentakisphosphate (IP(5)) and ATP. The first structure of IP(5) 2-K, that from Arabidopsis thaliana, has been solved previously; it only crystallized in the presence of inositol, either the substrate IP(5) or the product IP(6), and failed to crystallize in its free state (without inositol). Based on structural analysis, a point mutation of IP(5) 2-K (W129A) has been produced in order to overcome this limitation and obtain information about protein conformational changes upon substrate binding. Here, the production and crystallization of W129A IP(5) 2-K in its free state and with bound nucleotide is described. These crystals differed from the native crystals and belonged to the orthorhombic space group P2(1)2(1)2, with unit-cell parameters a = 66.00, b = 68.23, c = 105.80 A and a = 63.06, b = 71.80, c = 100.23 A, respectively. The crystals diffracted to resolutions of 2.22 A (apo) and 2.05 A (nucleotide bound) using synchrotron radiation and contained one molecule per asymmetric unit. The structures have been determined using the molecular-replacement method and refinement is being undertaken.

Expression, purification, crystallization and preliminary X-ray diffraction analysis of the apo form of InsP5 2-K from Arabidopsis thaliana.,Banos-Sanz JI, Sanz-Aparicio J, Brearley CA, Gonzalez B Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Jun 1;68(Pt 6):701-4. doi:, 10.1107/S1744309112017307. Epub 2012 May 23. PMID:22684075^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Stevenson-Paulik J, Bastidas RJ, Chiou ST, Frye RA, York JD. Generation of phytate-free seeds in Arabidopsis through disruption of inositol polyphosphate kinases. Proc Natl Acad Sci U S A. 2005 Aug 30;102(35):12612-7. Epub 2005 Aug 17. PMID:16107538 doi:10.1073/pnas.0504172102
↑ Sweetman D, Johnson S, Caddick SE, Hanke DE, Brearley CA. Characterization of an Arabidopsis inositol 1,3,4,5,6-pentakisphosphate 2-kinase (AtIPK1). Biochem J. 2006 Feb 15;394(Pt 1):95-103. PMID:16223361 doi:BJ20051331
↑ Banos-Sanz JI, Sanz-Aparicio J, Brearley CA, Gonzalez B. Expression, purification, crystallization and preliminary X-ray diffraction analysis of the apo form of InsP5 2-K from Arabidopsis thaliana. Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Jun 1;68(Pt 6):701-4. doi:, 10.1107/S1744309112017307. Epub 2012 May 23. PMID:22684075 doi:http://dx.doi.org/10.1107/S1744309112017307

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4aqk"

@@ Line 1: / Line 1: @@
 ==Inositol 1,3,4,5,6-pentakisphosphate 2-kinase in complex with ADP and IP6==
 <StructureSection load='4aqk' size='340' side='right' caption='[[4aqk]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2xal|2xal]], [[2xam|2xam]], [[2xan|2xan]], [[2xao|2xao]], [[2xar|2xar]]</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Inositol-pentakisphosphate_2-kinase Inositol-pentakisphosphate 2-kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.158 2.7.1.158] </span></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4aqk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4aqk OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4aqk RCSB], [http://www.ebi.ac.uk/pdbsum/4aqk PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4aqk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4aqk OCA], [http://pdbe.org/4aqk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4aqk RCSB], [http://www.ebi.ac.uk/pdbsum/4aqk PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4aqk ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 19: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4aqk" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4aqk

From Proteopedia

Revision as of 09:37, 5 August 2016

Inositol 1,3,4,5,6-pentakisphosphate 2-kinase in complex with ADP and IP6

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

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