Cyclomaltodextrin glucanotransferase variants
AssigneeNovo Nordisk A/S
InventorsLubbert Dijkhuizen, Bauke W. Dijkstra, Carsten Andersen, Claus von der Osten
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Abstract
The present invention relates to variants of cyclomaltodextrin glucanotransferase. More specifically the invention relates to a method of modifying the substrate binding and/or product selectivity of a precursor CGTase enzyme, and CGTase variants derived from a precursor CGTase enzyme by substitution, insertion and/or deletion of one or more amino acid residue(s), which amino acid residue(s) holds a position close to the substrate. Moreover, the invention relates to DNA constructs encoding the CGTase variants, expression vectors, host cells and methods of producing the CGTase variants of the invention.
Claims62
A variant of a cyclodextrin glycosyl transferase, comprising one or more alterations selected from the group consisting of insertions, deletions and substitations, wherein each alteration independently results in:
- (a) the amino acid at position 89 being alanine, aspartic acid or glycine,
- (b) the amino acid at position 94 being arginine, glutamine, lysine, tryptophan, or phenylalanine, or deleted,
- (c) the amino acid at position 145a being isoleucine,
- (d) the amino acid at position 147 being alanine, isoleucine, leucine, serine, or tryptophan,
- (e) the amino acid at position 147a being alanine,
- (f) the amino acid at position 149 being isoleucine,
- (g) the amino acid at position 167 being phenylalanine,
- (h) the amino acid at position 185 being arginine, aspartic acid, or glutamic acid,
- (i) the amino acid at position 186 being alanine,
- (j) die amino acid at position 193 being alanine, aspartic acid, glutamic acid, or glycine,
- (k) the amino acid at position 196 being alanine or leucine,
- (l) the amino acid at position 197 being aspartic acid or glutamic acid,
- (m) the amino acid at position 232 being alanine, asparagine, glutamine, or leucine,
- (n) the amino acid at position 268 being alanine,
- (o) the amino acid at position 371 being alanine, asparagine, glutamic acid, glycine, or leucine,
- (p) the amino acid at position 375 being alanine, asparagine, glutamine, glycine, leucine, or proline,
- (q) the amino acid at position 599a being arginine, histidine, or proline,
- (r) the amino acid at position 616 being alanine,
- (s) the amino acid at position 633 being alanine,
- (t) the amino acid at position 662 being alanine,
- (u) the amino acid at position 47 being histidine or arginine and at position 135 being leucine,
- (v) the amino acid at position 88 being proline and at position 143 being glycine,
- (w) the amino acid at position 89 being aspartic acid and at position 146 being proline,
- (y) the amino acid at position 143 being alanine and at position 144 being arginine,
- (z) the amino acid at position 143 being glycine, at position 144 being arginine, and at position 145 being tryptophan,
- (aa) the amino acids at positions 143-148 being GRA**A (SEQ ID NO:7), GRAAAA (SEQ ID NO:8), GRAPAA (SEQ ID NO:9), or GRGPAA (SEQ ID NO:10),
- (ab) the amino acid at position 144 being arginine, at position 145 being alanine, and at position 146 being proline,
- (ac) the amino acid at position 145 being alanine and at position 145a being isoleucine,
- (ad) the amino acid at position 145 being leucine and at position 148 being asparagine,
- (ae) the amino acid at position 145 being glutamic acid and at position 146 being glutamine or proline,
- (af) the amino acid at position 145 being tryptophan and at position 146 being arginine, isoleucine, or tryptophan,
- (ag) the amino acid at position 145 being alanine, at position 145a being isoleucine, and at position 148 being glutamic acid,
- (ah) the amino acids at position 616 being alanine and at position 662 being alanine,
- (ai) the amino acids at positions 87-94 being HP*SGY** (SEQ ID NO:3), and/or at positions 143-151 being PALETNPNF (SEQ ID NO:4) or PAAETWPAF (SEQ ID NO:5),
- (aj) the amino acids at positions 87-94 being HP*SGY** (SEQ ID NO:3), and/or at positions 143-151 being PALETNPNF (SEQ ID NO:4), or PAAEADPNF (SEQ ID NO:6),
- wherein each position corresponds to the position of the amino acid sequence of the mature cyclodexrin glycosyl transferase obtained from Bacillus circulans strain 251 and wherein the variant has cyclodextrin glycosyl transferase activity.
A variant of a cyclodextrin glycosyl transferase, comprising one or more alterations selected from the group consisting of insertions, deletions and substitutions, wherein each alteration independently results in:
- (a) the amino acid at position 21 being tyrosine,
- (b) the amino acid at position 47 being glutamine, alanine, or leucine,
- (c) the amino acid at position 88 being proline,
- (d) the amino acid at position 91a being alanine,
- (e) the amino acid at position 143 being alanine,
- (f) the amino acid at position 144 being lysine or aspartic acid,
- (g) the amino acid at position 145 being glutamic acid, tryptophan, glycine, phenylalanine, tyrosine, or proline,
- (h) the amino acid at position 146 being proline, serine, isoleucine, glutamine, tryptophan, or arginine,
- (i) the amino acid at position 148 being alanine, glycine, or glutamic acid,
- (j) the amino acid at position 264 being alanine, asparagine, or leucine,
- (k) the amino acid at position 600 being tryptophan, phenylalanine, arginine, or asparagine,
- (l) the amino acids at positions 87-94 being IKYSGVNN (SEQ ID NO:11), and at positions 143-151 being GRAGTNPGF (SEQ ID NO:12), or at positions 143-145 being GRW,
- wherein each position corresponds to the position of the amino acid sequence of the mature cyclodextrin glycosyl transferase obtained from Bacillus circulans strain 251 and wherein the variant has cyclodextrin glycosyl transferase activity.
Dependencies are inferred from the claim text.