Three-dimensional structure of isoprene synthase and its use thereof for generating variants
First Claim
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1. An isolated host cell comprising an isoprene synthase variant produced by:
- a) identifying hydrophobic amino acid residues on the surface of isoprene synthase based on the three dimensional structure of P. alba isoprene synthase;
b) introducing one or more amino acid substitutions in the surface amino acids of said isoprene synthase to produce an isoprene synthase variant; and
c) identifying said isoprene synthase variants with substitutions that improve activity, expression or stability of the isoprene synthase,wherein said isoprene synthase variant comprises one or more amino acid substitutions at a hydrophobic surface amino acid position corresponding to a hydrophobic surface amino acid position of SEQ ID NO;
45 selected from the group I28, V30, L130, G153, L469, L303 and L494; and
wherein said isoprene synthase variant has improved activity, expression or stability of the isoprene synthase compared to an isoprene synthase without said one or more amino acid substitutions.
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Abstract
The present invention provides a three-dimensional structures of P. tremuloides isoprene synthase and P. alba isoprene synthase. The invention also provides methods of using the three-dimensional structure to design isoprene synthases with improved activity for increased isoprene production in microbial host cells. Biosynthetically produced isoprene of the present invention finds use in the manufacture of rubber and elastomers.
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15 Claims
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1. An isolated host cell comprising an isoprene synthase variant produced by:
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a) identifying hydrophobic amino acid residues on the surface of isoprene synthase based on the three dimensional structure of P. alba isoprene synthase; b) introducing one or more amino acid substitutions in the surface amino acids of said isoprene synthase to produce an isoprene synthase variant; and c) identifying said isoprene synthase variants with substitutions that improve activity, expression or stability of the isoprene synthase, wherein said isoprene synthase variant comprises one or more amino acid substitutions at a hydrophobic surface amino acid position corresponding to a hydrophobic surface amino acid position of SEQ ID NO;
45 selected from the group I28, V30, L130, G153, L469, L303 and L494; andwherein said isoprene synthase variant has improved activity, expression or stability of the isoprene synthase compared to an isoprene synthase without said one or more amino acid substitutions. - View Dependent Claims (15)
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2. An isolated host cell comprising an isoprene synthase variant, wherein the isoprene synthase variant comprises one or more amino acid substitutions at a hydrophobic surface amino acid position corresponding to a hydrophobic surface amino acid position of SEQ ID NO:
- 45 selected from the group I28, V30, L130, G153, L469, L303 and L494 and wherein said isoprene synthase variant has improved activity, expression and/or stability as compared to an isoprene synthase without said one or more amino acid substitutions.
- View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
Specification