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4kp1

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Revision as of 08:46, 5 August 2016

Crystal structure of IPM isomerase large subunit from methanococcus jannaschii (MJ0499)

Structural highlights

4kp1 is a 1 chain structure with sequence from Metja. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, ,
NonStd Res:
Gene:	leuC, MJ0499 (METJA)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[LEUC_METJA] Enzyme with broad specificity that catalyzes reversible hydroxyacid isomerizations via dehydration/hydration reactions. Catalyzes the isomerization between 2-isopropylmalate and 3-isopropylmalate, via the formation of 2-isopropylmaleate, a step involved in leucine biosynthesis. Catalyzes the isomerization between 2-methylmalate and 3-methylmalate, via the formation of 2-methylmaleate (citraconate), a step involved in isoleucine biosynthesis. Also displays malease activity, i.e. catalyzes the hydration of maleate to form (R)-malate.^[1]

Publication Abstract from PubMed

The aconitase family of proteins includes three classes of hydro-lyase enzymes: aconitases, homoaconitases and isopropylmalate (IPM) isomerases. They have a common Fe-S cluster-binding site and catalyze the isomerization of specific substrates by sequential dehydration and hydration. The archaeon Methanococcus jannaschii contains two aconitase family proteins, IPM isomerase and homoaconitase, which have 50% sequence identity. These two enzymes are heterodimeric proteins composed of large and small subunits encoded by separate genes. Although structures have been reported for the small subunits of the two enzymes, the first structures of oxidized and reduced forms of the large subunit of IPM isomerase (ox-MJ0499 and red-MJ0499, respectively) from M. jannaschii are reported here at 1.8 and 2.7 A resolution, respectively, together with the structure of the large subunit of homoaconitase (MJ1003) at 2.5 A resolution. The structures of both proteins have unbound Fe-S clusters and contain a fourth cysteine in the active site. The active site of MJ1003 is homologous to that of aconitase, whereas MJ0499 has significant structural distortion at the active site compared with aconitase. In addition, significant large conformational changes were observed in the active site of red-MJ0499 when compared with ox-MJ0499. The active sites of the two proteins adopt two different states before changing to the Fe-S cluster-bound `activated' state observed in aconitase. MJ1003 has an `open' active site, which forms an active pocket for the cluster, while ox-MJ0499 has a `closed' active site, with four cysteines in disulfide bonds. These data will be helpful in understanding the biochemical mechanism of clustering of the Fe-S protein family.

Structural characterization and comparison of the large subunits of IPM isomerase and homoaconitase from Methanococcus jannaschii.,Lee EH, Lee K, Hwang KY Acta Crystallogr D Biol Crystallogr. 2014 Apr 1;70(Pt 4):922-31. doi:, 10.1107/S1399004713033762. Epub 2014 Mar 19. PMID:24699638^[2]

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

References

↑ Drevland RM, Waheed A, Graham DE. Enzymology and evolution of the pyruvate pathway to 2-oxobutyrate in Methanocaldococcus jannaschii. J Bacteriol. 2007 Jun;189(12):4391-400. Epub 2007 Apr 20. PMID:17449626 doi:http://dx.doi.org/10.1128/JB.00166-07
↑ Lee EH, Lee K, Hwang KY. Structural characterization and comparison of the large subunits of IPM isomerase and homoaconitase from Methanococcus jannaschii. Acta Crystallogr D Biol Crystallogr. 2014 Apr 1;70(Pt 4):922-31. doi:, 10.1107/S1399004713033762. Epub 2014 Mar 19. PMID:24699638 doi:http://dx.doi.org/10.1107/S1399004713033762

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4kp1"

@@ Line 1: / Line 1: @@
 ==Crystal structure of IPM isomerase large subunit from methanococcus jannaschii (MJ0499)==
 <StructureSection load='4kp1' size='340' side='right' caption='[[4kp1]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">leuC, MJ0499 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=243232 METJA])</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=4kp1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kp1 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4kp1 RCSB], [http://www.ebi.ac.uk/pdbsum/4kp1 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=4kp1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kp1 OCA], [http://pdbe.org/4kp1 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4kp1 RCSB], [http://www.ebi.ac.uk/pdbsum/4kp1 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4kp1 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 4kp1" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Isopropylmalate isomerase|Isopropylmalate isomerase]]
 == References ==
 <references/>

4kp1

From Proteopedia

Revision as of 08:46, 5 August 2016

Crystal structure of IPM isomerase large subunit from methanococcus jannaschii (MJ0499)

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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