DHAD variants and methods of screening
First Claim
Patent Images
1. An isolated polypeptide having dihydroxy-acid dehydratase (DHAD) activity, wherein the polypeptide is a Streptococcus mutans DHAD and comprises one or more amino acid substitutions selected from:
- (a) aspartic acid at a position corresponding to position 33 of SEQ ID NO;
168;
(b) glutamic acid at a position corresponding to position 62 of SEQ ID NO;
168;
(c) valine at a position corresponding to position 115 of SEQ ID NO;
168;
(d) glutamic acid at a position corresponding to position 116 of SEQ ID NO;
168;
(e) serine at a position corresponding to position 119 of SEQ ID NO;
168;
(f) arginine at a position corresponding to position 158 of SEQ ID NO;
168;
(g) glutamine at a position corresponding to position 176 of SEQ ID NO;
168;
(h) leucine at a position corresponding to position 179 of SEQ ID NO;
168;
(i) arginine at a position corresponding to position 322 of SEQ ID NO;
168;
(j) serine at a position corresponding to position 425 of SEQ ID NO;
168;
(k) glycine at a position corresponding to position 524 of SEQ ID NO;
168;
(l) valine or leucine at a position corresponding to position 562 of SEQ ID NO;
168;
(m) arginine, cysteine, or glycine at a position corresponding to position 563 of SEQ ID NO;
168;
(n) glutamic acid at a position corresponding to position 564 of SEQ ID NO;
168; and
(o) aspartic acid at a position corresponding to position 567 of SEQ ID NO;
168.
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Abstract
Methods of screening for dihydroxy-acid dehydratase (DHAD) variants that display increased DHAD activity are disclosed, along with DHAD variants identified by these methods. Such enzymes can result in increased production of compounds from DHAD requiring biosynthetic pathways. Also disclosed are isolated nucleic acids encoding the DHAD variants, recombinant host cells comprising the isolated nucleic acid molecules, and methods of producing butanol.
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Citations
6 Claims
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1. An isolated polypeptide having dihydroxy-acid dehydratase (DHAD) activity, wherein the polypeptide is a Streptococcus mutans DHAD and comprises one or more amino acid substitutions selected from:
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(a) aspartic acid at a position corresponding to position 33 of SEQ ID NO;
168;(b) glutamic acid at a position corresponding to position 62 of SEQ ID NO;
168;(c) valine at a position corresponding to position 115 of SEQ ID NO;
168;(d) glutamic acid at a position corresponding to position 116 of SEQ ID NO;
168;(e) serine at a position corresponding to position 119 of SEQ ID NO;
168;(f) arginine at a position corresponding to position 158 of SEQ ID NO;
168;(g) glutamine at a position corresponding to position 176 of SEQ ID NO;
168;(h) leucine at a position corresponding to position 179 of SEQ ID NO;
168;(i) arginine at a position corresponding to position 322 of SEQ ID NO;
168;(j) serine at a position corresponding to position 425 of SEQ ID NO;
168;(k) glycine at a position corresponding to position 524 of SEQ ID NO;
168;(l) valine or leucine at a position corresponding to position 562 of SEQ ID NO;
168;(m) arginine, cysteine, or glycine at a position corresponding to position 563 of SEQ ID NO;
168;(n) glutamic acid at a position corresponding to position 564 of SEQ ID NO;
168; and(o) aspartic acid at a position corresponding to position 567 of SEQ ID NO;
168. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification