Application of gene-shuffling for the rapid generation of novel [FeFe]-hydrogenase libraries |
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Authors: | Lauren E Nagy Jonathan E Meuser Scott Plummer Michael Seibert Maria L Ghirardi Paul W King Dianne Ahmann Matthew C Posewitz |
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Institution: | (1) Environmental Science and Engineering Division, Colorado School of Mines, Golden, CO 80401, USA;(2) Department of Chemistry, Colorado School of Mines, Golden, CO 80401, USA;(3) National Renewable Energy Laboratory, Basic Sciences Center, Golden, CO 80401, USA;(4) Present address: University of Oregon, Eugene, OR, USA |
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Abstract: | A gene-shuffling technique was identified, optimized and used to generate diverse libraries of recombinant FeFe]-hydrogenases.
Six native FeFe]-hydrogenase genes from species of Clostridia were first cloned and separately expressed in Escherichia coli concomitantly with the assembly proteins required for FeFe]-hydrogenase maturation. All enzymes, with the exception of C. thermocellum HydA, exhibited significant activity when expressed. Single-stranded DNA fragments from genes encoding the two most active
FeFe]-hydrogenases were used to optimize a gene-shuffling protocol and generate recombinant enzyme libraries. Random sampling
demonstrates that several shuffled products are active. This represents the first successful application of gene-shuffling
using hydrogenases. Moreover, we demonstrate that a single set of FeFe]-hydrogenase maturation proteins is sufficient for
the heterologous assembly of the bioinorganic active site of several native and shuffled FeFe]-hydrogenases. |
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Keywords: | Gene shuffling Heterologous expression Hydrogen Hydrogenase |
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