2gn1

From Proteopedia

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Revision as of 07:01, 20 June 2018

Crystal structure of dimeric biodegradative threonine deaminase (TdcB) from Salmonella typhimurium at 2.2A resolution (Triclinic form with one dimer of TdcB in the asymmetric unit)

Structural highlights

2gn1 is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
NonStd Res:
Related:	2gn0, 2gn2
Activity:	Threonine ammonia-lyase, with EC number 4.3.1.19
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[TDCB_SALTY] Catalyzes the anaerobic formation of alpha-ketobutyrate and ammonia from threonine in a two-step reaction. The first step involved a dehydration of threonine and a production of enamine intermediates (aminocrotonate), which tautomerizes to its imine form (iminobutyrate). Both intermediates are unstable and short-lived. The second step is the nonenzymatic hydrolysis of the enamine/imine intermediates to form 2-ketobutyrate and free ammonia. In the low water environment of the cell, the second step is accelerated by RidA. TdcB also dehydrates serine to yield pyruvate via analogous enamine/imine intermediates.^[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Two different pyridoxal 5'-phosphate-containing l-threonine deaminases (EC 4.3.1.19), biosynthetic and biodegradative, which catalyze the deamination of l-threonine to alpha-ketobutyrate, are present in Escherichia coli and Salmonella typhimurium. Biodegradative threonine deaminase (TdcB) catalyzes the first reaction in the anaerobic breakdown of l-threonine to propionate. TdcB, unlike the biosynthetic threonine deaminase, is insensitive to l-isoleucine and is activated by AMP. In the present study, TdcB from S. typhimurium was cloned and overexpressed in E. coli. In the presence of AMP or CMP, the recombinant enzyme was converted to the tetrameric form accompanied by significant enzyme activation. To provide insights into ligand-mediated oligomerization and enzyme activation, crystal structures of S. typhimurium TdcB and its complex with CMP were determined. In the native structure, TdcB is in a dimeric form, whereas in the TdcB.CMP complex, it exists in a tetrameric form with 222 symmetry and appears as a dimer of dimers. Tetrameric TdcB binds to four molecules of CMP, two at each of the dimer interfaces. Comparison of the dimer structure in the ligand (CMP)-free and -bound forms suggests that the changes induced by ligand binding at the dimer interface are essential for tetramerization. The differences observed in the tertiary and quaternary structures of TdcB in the absence and presence of CMP appear to account for enzyme activation and increased binding affinity for l-threonine. Comparison of TdcB with related pyridoxal 5'-phosphate-dependent enzymes points to structural and mechanistic similarities.

Crystal structures of Salmonella typhimurium biodegradative threonine deaminase and its complex with CMP provide structural insights into ligand-induced oligomerization and enzyme activation.,Simanshu DK, Savithri HS, Murthy MR J Biol Chem. 2006 Dec 22;281(51):39630-41. Epub 2006 Oct 17. PMID:17046821^[2]

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

References

↑ Simanshu DK, Savithri HS, Murthy MR. Crystal structures of Salmonella typhimurium biodegradative threonine deaminase and its complex with CMP provide structural insights into ligand-induced oligomerization and enzyme activation. J Biol Chem. 2006 Dec 22;281(51):39630-41. Epub 2006 Oct 17. PMID:17046821 doi:http://dx.doi.org/10.1074/jbc.M605721200
↑ Simanshu DK, Savithri HS, Murthy MR. Crystal structures of Salmonella typhimurium biodegradative threonine deaminase and its complex with CMP provide structural insights into ligand-induced oligomerization and enzyme activation. J Biol Chem. 2006 Dec 22;281(51):39630-41. Epub 2006 Oct 17. PMID:17046821 doi:http://dx.doi.org/10.1074/jbc.M605721200

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2gn1"

@@ Line 1: / Line 1: @@
 ==Crystal structure of dimeric biodegradative threonine deaminase (TdcB) from Salmonella typhimurium at 2.2A resolution (Triclinic form with one dimer of TdcB in the asymmetric unit)==
 <StructureSection load='2gn1' size='340' side='right' caption='[[2gn1]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
@@ Line 7: / Line 8: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2gn0|2gn0]], [[2gn2|2gn2]]</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Threonine_ammonia-lyase Threonine ammonia-lyase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.3.1.19 4.3.1.19] </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=2gn1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gn1 OCA], [http://pdbe.org/2gn1 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2gn1 RCSB], [http://www.ebi.ac.uk/pdbsum/2gn1 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=2gn1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gn1 OCA], [http://pdbe.org/2gn1 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2gn1 RCSB], [http://www.ebi.ac.uk/pdbsum/2gn1 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2gn1 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 15: / Line 16: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gn/2gn1_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gn/2gn1_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

2gn1

From Proteopedia

Revision as of 07:01, 20 June 2018

Crystal structure of dimeric biodegradative threonine deaminase (TdcB) from Salmonella typhimurium at 2.2A resolution (Triclinic form with one dimer of TdcB in the asymmetric unit)

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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