View source for 3bif


==6-PHOSPHOFRUCTO-2-KINASE/FRUCTOSE-2,6-BISPHOSPHATASE EMPTY 6-PF-2K ACTIVE SITE==
<StructureSection load='3bif' size='340' side='right'caption='[[3bif]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3bif]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3BIF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3BIF 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]] 2.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BOG:B-OCTYLGLUCOSIDE'>BOG</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=SIN:SUCCINIC+ACID'>SIN</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=3bif FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3bif OCA], [https://pdbe.org/3bif PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3bif RCSB], [https://www.ebi.ac.uk/pdbsum/3bif PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3bif ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/F264_RAT F264_RAT] Synthesis and degradation of fructose 2,6-bisphosphate.
== 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/bi/3bif_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=3bif ConSurf].
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== Publication Abstract from PubMed ==
The bifunctional enzyme 6-phosphofructo-2-kinase/fructose-2, 6-bisphosphatase plays an essential role in the regulation of glucose metabolism by both producing and degrading Fru-2,6-P(2) via its distinct catalytic activities. The 6-PF-2-K and Fru-2,6-P(2)ase active sites are located in separate domains of the enzyme. The kinase domain is structurally related to the superfamily of mononucleotide binding proteins that includes adenylate kinase and the G-proteins. We have determined three new structures of the enzymatic monomer, each with a different ligand in the ATP binding site of the 6-PF-2-K domain (AMP-PNP, PO(4), and water). A comparison of these three new structures with the ATPgammaS-bound 6-PF-2-K domain reveals a rearrangement of a helix that is dependent on the ligand bound in the ATP binding site of the enzyme. This helix motion dramatically alters the position of a catalytic residue (Lys172). This catalytic cation is analogous to the Arg residue donated by the rasGAP protein, and the Arg residue at the core of the GTP or GDP sensing switch motion seen in the heterotrimeric G-proteins. In addition, a succinate molecule is observed in the Fru-6-P binding site. Kinetic analysis of succinate inhibition of the 6-PF-2-K reaction is consistent with the structural findings, and suggests a mechanism for feedback inhibition of glycolysis by citric acid cycle intermediates. Alterations in the 6-PF-2-K kinetics of several proteins mutated near both the switch and the succinate binding site suggest a mode of communication between the ATP- and F6P binding sites. Together with these kinetic data, these new structures provide insights into the mechanism of the 6-PF-2-K activity of this important bifunctional enzyme.

A switch in the kinase domain of rat testis 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase.,Yuen MH, Wang XL, Mizuguchi H, Uyeda K, Hasemann CA Biochemistry. 1999 Sep 21;38(38):12333-42. PMID:10493801<ref>PMID:10493801</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 3bif" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Rattus norvegicus]]
[[Category: Hasemann CA]]
[[Category: Yuen MH]]