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5ayj

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Hyperthermostable mutant of Bacillus sp. TB-90 Urate Oxidase - R298C

Structural highlights

5ayj is a 4 chain structure with sequence from Bacillus sp. TB-90. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.05Å
Ligands:	, ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

PUCL_BACSB Catalyzes two steps in the degradation of uric acid, i.e. the oxidation of uric acid to 5-hydroxyisourate (HIU) and the stereoselective decarboxylation of 2-oxo-4-hydroxy-4-carboxy-5-ureidoimidazoline (OHCU) to (S)-allantoin (By similarity).

Publication Abstract from PubMed

Bacillus sp. TB-90 urate oxidase (BTUO) is one of the most thermostable homotetrameric enzymes. We previously reported [Hibi, T., et al. (2014) Biochemistry 53, 3879-3888] that specific binding of a sulfate anion induced thermostabilization of the enzyme, because the bound sulfate formed a salt bridge with two Arg298 residues, which stabilized the packing between two beta-barrel dimers. To extensively characterize the sulfate-binding site, Arg298 was substituted with cysteine by site-directed mutagenesis. This substitution markedly increased the protein melting temperature by approximately 20 degrees C compared with that of the wild-type enzyme, which was canceled by reduction with dithiothreitol. Calorimetric analysis of the thermal denaturation suggested that the hyperstabilization resulted from suppression of the dissociation of the tetramer into the two homodimers. The crystal structure of R298C at 2.05 A resolution revealed distinct disulfide bond formation between the symmetrically related subunits via Cys298, although the Cbeta distance between Arg298 residues of the wild-type enzyme (5.4 A apart) was too large to predict stable formation of an engineered disulfide cross-link. Disulfide bonding was associated with local disordering of interface loop II (residues 277-300), which suggested that the structural plasticity of the loop allowed hyperstabilization by disulfide formation. Another conformational change in the C-terminal region led to intersubunit hydrogen bonding between Arg7 and Asp312, which probably promoted mutant thermostability. Knowledge of the disulfide linkage of flexible loops at the subunit interface will help in the development of new strategies for enhancing the thermostabilization of multimeric proteins.

Hyperstabilization of Tetrameric Bacillus sp. TB-90 Urate Oxidase by Introducing Disulfide Bonds through Structural Plasticity.,Hibi T, Kume A, Kawamura A, Itoh T, Fukada H, Nishiya Y Biochemistry. 2016 Jan 15. PMID:26739254^[1]

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

References

↑ Hibi T, Kume A, Kawamura A, Itoh T, Fukada H, Nishiya Y. Hyperstabilization of Tetrameric Bacillus sp. TB-90 Urate Oxidase by Introducing Disulfide Bonds through Structural Plasticity. Biochemistry. 2016 Jan 15. PMID:26739254 doi:http://dx.doi.org/10.1021/acs.biochem.5b01119

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/5ayj"

@@ Line 4: / Line 4: @@
 == Structural highlights ==
 <table><tr><td colspan='2'>[[5ayj]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_sp._TB-90 Bacillus sp. TB-90]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5AYJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5AYJ FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MUA:9-METHYL+URIC+ACID'>MUA</scene>, <scene name='pdbligand=P6G:HEXAETHYLENE+GLYCOL'>P6G</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.05&#8491;</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MUA:9-METHYL+URIC+ACID'>MUA</scene>, <scene name='pdbligand=P6G:HEXAETHYLENE+GLYCOL'>P6G</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=5ayj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ayj OCA], [https://pdbe.org/5ayj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5ayj RCSB], [https://www.ebi.ac.uk/pdbsum/5ayj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5ayj ProSAT]</span></td></tr>
 </table>

5ayj

From Proteopedia

Current revision

Hyperthermostable mutant of Bacillus sp. TB-90 Urate Oxidase - R298C

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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