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| | <StructureSection load='4v2i' size='340' side='right'caption='[[4v2i]], [[Resolution|resolution]] 1.69Å' scene=''> | | <StructureSection load='4v2i' size='340' side='right'caption='[[4v2i]], [[Resolution|resolution]] 1.69Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4v2i]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Thalassospira_sp._gb04j01 Thalassospira sp. gb04j01]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4V2I OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4V2I FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4v2i]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Thalassospira_sp._GB04J01 Thalassospira sp. GB04J01]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4V2I OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4V2I FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Carboxylesterase Carboxylesterase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.1.1 3.1.1.1] </span></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=4v2i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4v2i OCA], [https://pdbe.org/4v2i PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4v2i RCSB], [https://www.ebi.ac.uk/pdbsum/4v2i PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4v2i ProSAT]</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=4v2i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4v2i OCA], [http://pdbe.org/4v2i PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4v2i RCSB], [http://www.ebi.ac.uk/pdbsum/4v2i PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4v2i ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/A0A023T3X2_9PROT A0A023T3X2_9PROT] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Carboxylesterase]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Thalassospira sp. gb04j01]] | + | [[Category: Thalassospira sp. GB04J01]] |
| - | [[Category: Altermark, B]] | + | [[Category: Altermark B]] |
| - | [[Category: Leiros, H K.S]] | + | [[Category: Leiros H-KS]] |
| - | [[Category: Pascale, D D]] | + | [[Category: Pascale DD]] |
| - | [[Category: Santi, C D]] | + | [[Category: Santi CD]] |
| - | [[Category: Scala, A D]] | + | [[Category: Scala AD]] |
| - | [[Category: Willassen, N P]] | + | [[Category: Willassen N-P]] |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Thalip2349]]
| + | |
| Structural highlights
Function
A0A023T3X2_9PROT
Publication Abstract from PubMed
A gene encoding an esterase, ThaEst2349, was identified in the marine psychrophilic bacterium Thalassospira sp. GB04J01. The gene was cloned and overexpressed in E. coli as a His-tagged fusion protein. The recombinant enzyme showed optimal activity at 45 degrees C and the thermal stability displayed a retention of 75 % relative activity at 40 degrees C after 2 h. The optimal pH was 8.5 but the enzyme kept more than 75 % of its maximal activity between pH 8.0 and 9.5. ThaEst2349 also showed remarkable tolerance towards high concentrations of salt and it was active against short-chain p-nitrophenyl esters, displaying optimal activity with the acetate. The enzyme was tested for tolerance of organic solvents and the results are suggesting that it could function as an interesting candidate for biotechnological applications. The crystal structure of ThaEst2349 was determined to 1.69 A revealing an asymmetric unit containing two chains, which also is the biological unit. The structure has a characteristic cap domain and a catalytic triad comprising Ser158, His285 and Asp255. To explain the cold-active nature of the enzyme, we compared it against thermophilic counterparts. Our hypothesis is that a high methionine content, less hydrogen bonds and less ion pairs render the enzyme more flexible at low temperatures.
Biochemical characterization and structural analysis of a new cold-active and salt-tolerant esterase from the marine bacterium Thalassospira sp.,De Santi C, Leiros HK, Di Scala A, de Pascale D, Altermark B, Willassen NP Extremophiles. 2016 May;20(3):323-36. doi: 10.1007/s00792-016-0824-z. Epub 2016, Mar 25. PMID:27016194[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ De Santi C, Leiros HK, Di Scala A, de Pascale D, Altermark B, Willassen NP. Biochemical characterization and structural analysis of a new cold-active and salt-tolerant esterase from the marine bacterium Thalassospira sp. Extremophiles. 2016 May;20(3):323-36. doi: 10.1007/s00792-016-0824-z. Epub 2016, Mar 25. PMID:27016194 doi:http://dx.doi.org/10.1007/s00792-016-0824-z
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