6jd9: Difference between revisions
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==Proteus mirabilis lipase mutant - I118V/E130G== | |||
<StructureSection load='6jd9' size='340' side='right'caption='[[6jd9]], [[Resolution|resolution]] 1.58Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[6jd9]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6JD9 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6JD9 FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene></td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Triacylglycerol_lipase Triacylglycerol lipase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.1.3 3.1.1.3] </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=6jd9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6jd9 OCA], [http://pdbe.org/6jd9 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6jd9 RCSB], [http://www.ebi.ac.uk/pdbsum/6jd9 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6jd9 ProSAT]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Background: We have recently developed a one-step, genetically encoded immobilization approach based on fusion of a target enzyme to the self-crystallizing protein Cry3Aa, followed by direct production and isolation of the fusion crystals from Bacillus thuringiensis. Using this approach, Bacillus subtilis lipase A was genetically fused to Cry3Aa to produce a Cry3Aa-lipA catalyst capable of the facile conversion of coconut oil into biodiesel over 10 reaction cycles. Here, we investigate the fusion of another lipase to Cry3Aa with the goal of producing a catalyst suitable for the conversion of waste cooking oil into biodiesel. Results: Genetic fusion of the Proteus mirabilis lipase (PML) to Cry3Aa allowed for the production of immobilized lipase crystals (Cry3Aa-PML) directly in bacterial cells. The fusion resulted in the loss of PML activity, however, and so taking advantage of its genetically encoded immobilization, directed evolution was performed on Cry3Aa-PML directly in its immobilized state in vivo. This novel strategy allowed for the selection of an immobilized PML mutant with 4.3-fold higher catalytic efficiency and improved stability. The resulting improved Cry3Aa-PML catalyst could be used to catalyze the conversion of waste cooking oil into biodiesel for at least 15 cycles with minimal loss in conversion efficiency. Conclusions: The genetically encoded nature of our Cry3Aa-fusion immobilization platform makes it possible to perform both directed evolution and screening of immobilized enzymes directly in vivo. This work is the first example of the use of directed evolution to optimize an enzyme in its immobilized state allowing for identification of a mutant that would unlikely have been identified from screening of its soluble form. We demonstrate that the resulting Cry3Aa-PML catalyst is suitable for the recyclable conversion of waste cooking oil into biodiesel. | |||
Directed evolution of a genetically encoded immobilized lipase for the efficient production of biodiesel from waste cooking oil.,Heater BS, Chan WS, Lee MM, Chan MK Biotechnol Biofuels. 2019 Jun 28;12:165. doi: 10.1186/s13068-019-1509-5., eCollection 2019. PMID:31297153<ref>PMID:31297153</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: Chan, M | <div class="pdbe-citations 6jd9" style="background-color:#fffaf0;"></div> | ||
[[Category: Chan, W | == References == | ||
[[Category: Heater, B | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Triacylglycerol lipase]] | |||
[[Category: Chan, M K]] | |||
[[Category: Chan, W S]] | |||
[[Category: Heater, B S]] | |||
[[Category: Hydrolase]] | |||
[[Category: Lipase]] | |||
[[Category: Proteus mirabilis lipase]] | |||
Revision as of 09:13, 24 July 2019
Proteus mirabilis lipase mutant - I118V/E130GProteus mirabilis lipase mutant - I118V/E130G
Structural highlights
Publication Abstract from PubMedBackground: We have recently developed a one-step, genetically encoded immobilization approach based on fusion of a target enzyme to the self-crystallizing protein Cry3Aa, followed by direct production and isolation of the fusion crystals from Bacillus thuringiensis. Using this approach, Bacillus subtilis lipase A was genetically fused to Cry3Aa to produce a Cry3Aa-lipA catalyst capable of the facile conversion of coconut oil into biodiesel over 10 reaction cycles. Here, we investigate the fusion of another lipase to Cry3Aa with the goal of producing a catalyst suitable for the conversion of waste cooking oil into biodiesel. Results: Genetic fusion of the Proteus mirabilis lipase (PML) to Cry3Aa allowed for the production of immobilized lipase crystals (Cry3Aa-PML) directly in bacterial cells. The fusion resulted in the loss of PML activity, however, and so taking advantage of its genetically encoded immobilization, directed evolution was performed on Cry3Aa-PML directly in its immobilized state in vivo. This novel strategy allowed for the selection of an immobilized PML mutant with 4.3-fold higher catalytic efficiency and improved stability. The resulting improved Cry3Aa-PML catalyst could be used to catalyze the conversion of waste cooking oil into biodiesel for at least 15 cycles with minimal loss in conversion efficiency. Conclusions: The genetically encoded nature of our Cry3Aa-fusion immobilization platform makes it possible to perform both directed evolution and screening of immobilized enzymes directly in vivo. This work is the first example of the use of directed evolution to optimize an enzyme in its immobilized state allowing for identification of a mutant that would unlikely have been identified from screening of its soluble form. We demonstrate that the resulting Cry3Aa-PML catalyst is suitable for the recyclable conversion of waste cooking oil into biodiesel. Directed evolution of a genetically encoded immobilized lipase for the efficient production of biodiesel from waste cooking oil.,Heater BS, Chan WS, Lee MM, Chan MK Biotechnol Biofuels. 2019 Jun 28;12:165. doi: 10.1186/s13068-019-1509-5., eCollection 2019. PMID:31297153[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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