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1b1a

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Revision as of 08:47, 21 May 2019

GLUTAMATE MUTASE (B12-BINDING SUBUNIT), NMR, MINIMIZED AVERAGE STRUCTURE

Structural highlights

1b1a is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Activity:	Methylaspartate mutase, with EC number 5.4.99.1
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[GMSS_CLOCO] Catalyzes the carbon skeleton rearrangement of L-glutamate to L-threo-3-methylaspartate ((2S,3S)-3-methylaspartate).[HAMAP-Rule:MF_00526]^[1] ^[2] ^[3]

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

Glutamate mutase (Glm) is an adenosylcobamide-dependent enzyme that catalyzes the reversible rearrangement of (2S)-glutamate to (2S, 3S)-3-methylaspartate. The active enzyme from Clostridium cochlearium consists of two subunits (of 53.6 and 14.8 kDa) as an alpha2beta2 tetramer, whose assembly is mediated by coenzyme B12. The smaller of the protein components, GlmS, has been suggested to be the B12-binding subunit. Here we report the solution structure of GlmS, determined from a heteronuclear NMR-study, and the analysis of important dynamical aspects of this apoenzyme subunit. The global fold and dynamic behavior of GlmS in solution are similar to those of the corresponding subunit MutS from C. tetanomorphum, which has previously been investigated using NMR-spectroscopy. Both solution structures of the two Glm B12-binding subunits share striking similarities with that determined by crystallography for the B12-binding domain of methylmalonyl CoA mutase (Mcm) from Propionibacterium shermanii, which is B12 bound. In the crystal structure a conserved histidine residue was found to be coordinated to cobalt, displacing the endogenous axial ligand of the cobamide. However, in GlmS and MutS the sequence motif, Asp-x-His-x-x-Gly, which includes the cobalt-coordinating histidine residue, and a predicted alpha-helical region following the motif, are present as an unstructured and highly mobile loop. In the absence of coenzyme, the B12-binding site apparently is only partially formed. By comparing the crystal structure of Mcm with the solution structures of B12-free GlmS and MutS, a consistent picture on the mechanism of B12 binding has been obtained. Important elements of the binding site only become structured upon binding B12; these include the cobalt-coordinating histidine residue, and an alpha helix that forms one side of the cleft accommodating the nucleotide 'tail' of the coenzyme.

Structure and dynamics of the B12-binding subunit of glutamate mutase from Clostridium cochlearium.,Hoffmann B, Konrat R, Bothe H, Buckel W, Krautler B Eur J Biochem. 1999 Jul;263(1):178-88. PMID:10429202^[4]

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

References

↑ Leutbecher U, Bocher R, Linder D, Buckel W. Glutamate mutase from Clostridium cochlearium. Purification, cobamide content and stereospecific inhibitors. Eur J Biochem. 1992 Apr 15;205(2):759-65. PMID:1315276
↑ Zelder O, Beatrix B, Leutbecher U, Buckel W. Characterization of the coenzyme-B12-dependent glutamate mutase from Clostridium cochlearium produced in Escherichia coli. Eur J Biochem. 1994 Dec 1;226(2):577-85. PMID:7880251
↑ Zelder O, Beatrix B, Buckel W. Cloning, sequencing and expression in Escherichia coli of the gene encoding component S of the coenzyme B12-dependent glutamate mutase from Clostridium cochlearium. FEMS Microbiol Lett. 1994 May 1;118(1-2):15-21. PMID:8013871
↑ Hoffmann B, Konrat R, Bothe H, Buckel W, Krautler B. Structure and dynamics of the B12-binding subunit of glutamate mutase from Clostridium cochlearium. Eur J Biochem. 1999 Jul;263(1):178-88. PMID:10429202

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1b1a"

@@ Line 1: / Line 1: @@
 ==GLUTAMATE MUTASE (B12-BINDING SUBUNIT), NMR, MINIMIZED AVERAGE STRUCTURE==
-<StructureSection load='1b1a' size='340' side='right' caption='[[1b1a]], [[NMR_Ensembles_of_Models | 1 NMR models]]' scene=''>
+<StructureSection load='1b1a' size='340' side='right'caption='[[1b1a]], [[NMR_Ensembles_of_Models | 1 NMR models]]' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1b1a]] is a 1 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B1A OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1B1A FirstGlance]. <br>
@@ Line 13: / Line 13: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/b1/1b1a_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/b1/1b1a_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 32: / Line 32: @@
 __TOC__
 </StructureSection>
+[[Category: Large Structures]]
 [[Category: Methylaspartate mutase]]
 [[Category: Bothe, H]]

1b1a

From Proteopedia

Revision as of 08:47, 21 May 2019

GLUTAMATE MUTASE (B12-BINDING SUBUNIT), NMR, MINIMIZED AVERAGE STRUCTURE

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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