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1r50

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{{STRUCTURE_1r50| PDB=1r50 | SCENE= }}
{{STRUCTURE_1r50| PDB=1r50 | SCENE= }}
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'''Bacillus subtilis lipase A with covalently bound Sc-IPG-phosphonate-inhibitor'''
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===Bacillus subtilis lipase A with covalently bound Sc-IPG-phosphonate-inhibitor===
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==Overview==
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Phage display can be used as a protein-engineering tool for the selection of proteins with desirable binding properties from a library of mutants. Here we describe the application of this method for the directed evolution of Bacillus subtilis lipase A, an enzyme that has important properties for the preparation of the pharmaceutically relevant chiral compound 1,2-O-isopropylidene-sn-glycerol (IPG). PCR mutagenesis with spiked oligonucleotides was employed for saturation mutagenesis of a stretch of amino acids near the active site. After expression of these mutants on bacteriophages, dual selection with (S)-(+)- and (R)-(-)-IPG stereoisomers covalently coupled to enantiomeric phosphonate suicide inhibitors (SIRAN Sc and Rc inhibitors, respectively) was used for the isolation of variants with inverted enantioselectivity. The mutants were further characterised by determination of their Michaelis-Menten parameters. The 3D structures of the Sc and Rc inhibitor-lipase complexes were determined and provided structural insight into the mechanism of enantioselectivity of the enzyme. In conclusion, we have used phage display as a fast and reproducible method for the selection of Bacillus lipase A mutant enzymes with inverted enantioselectivity.
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{{ABSTRACT_PUBMED_16342303}}
==About this Structure==
==About this Structure==
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[[Category: Lipase]]
[[Category: Lipase]]
[[Category: Phosphonate inhibitor]]
[[Category: Phosphonate inhibitor]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 07:05:00 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 00:31:58 2008''

Revision as of 21:32, 27 July 2008

Image:1r50.png

Template:STRUCTURE 1r50

Bacillus subtilis lipase A with covalently bound Sc-IPG-phosphonate-inhibitor

Template:ABSTRACT PUBMED 16342303

About this Structure

1R50 is a Single protein structure of sequence from Bacillus subtilis. Full crystallographic information is available from OCA.

Reference

Directed evolution of Bacillus subtilis lipase A by use of enantiomeric phosphonate inhibitors: crystal structures and phage display selection., Droge MJ, Boersma YL, van Pouderoyen G, Vrenken TE, Ruggeberg CJ, Reetz MT, Dijkstra BW, Quax WJ, Chembiochem. 2006 Jan;7(1):149-57. PMID:16342303

Page seeded by OCA on Mon Jul 28 00:31:58 2008

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