EP1062359A1 - Preparation enzymatique de sirop de glucose a partir d'amidon - Google Patents

Preparation enzymatique de sirop de glucose a partir d'amidon

Info

Publication number
EP1062359A1
EP1062359A1 EP99906094A EP99906094A EP1062359A1 EP 1062359 A1 EP1062359 A1 EP 1062359A1 EP 99906094 A EP99906094 A EP 99906094A EP 99906094 A EP99906094 A EP 99906094A EP 1062359 A1 EP1062359 A1 EP 1062359A1
Authority
EP
European Patent Office
Prior art keywords
amylase
termamyl
glucose syrup
seq
variant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99906094A
Other languages
German (de)
English (en)
Inventor
Barrie Edmund Novo Nordisk A/S NORMAN
Hanne Vang Novo Nordisk A/S HENDRIKSEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novozymes AS
Original Assignee
Novo Nordisk AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novo Nordisk AS filed Critical Novo Nordisk AS
Publication of EP1062359A1 publication Critical patent/EP1062359A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14—Hydrolases (3)
    • C12N9/24—Hydrolases (3) acting on glycosyl compounds (3.2)
    • C12N9/2402—Hydrolases (3) acting on glycosyl compounds (3.2) hydrolysing O- and S- glycosyl compounds (3.2.1)
    • C12N9/2405—Glucanases
    • C12N9/2408—Glucanases acting on alpha -1,4-glucosidic bonds
    • C12N9/2411—Amylases
    • C12N9/2414—Alpha-amylase (3.2.1.1.)
    • C12N9/2417—Alpha-amylase (3.2.1.1.) from microbiological source
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P19/00—Preparation of compounds containing saccharide radicals
    • C12P19/14—Preparation of compounds containing saccharide radicals produced by the action of a carbohydrase (EC 3.2.x), e.g. by alpha-amylase, e.g. by cellulase, hemicellulase
    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13K—SACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES
    • C13K1/00—Glucose; Glucose-containing syrups
    • C13K1/06—Glucose; Glucose-containing syrups obtained by saccharification of starch or raw materials containing starch

Definitions

  • the present invention relates to a process for the preparation of starch-hydrolysate syrups having characteristics which render them particularly attractive for a variety of industrial applications, notably in the food industry.
  • the invention makes it possible using one enzyme, for the first time, to obtain syrups of the above-mentioned kind which closely match syrups whose preparation previously only feasible using acid hydrolysis ( i . e . , non-enzymatic hydrolysis) of starch.
  • Glucose syrups with a DE (Dextrose Equivalent) around 42 is widely used in industry as an ingredient in products such as hard boiled candy, toffees, fudge, fondant and the like.
  • the present invention is based on the finding that a glucose syrup with a DE in the range from 35 to 45 having a sugar spectrum close to that of the traditionally acid converted 42 DE glucose syrup can be obtained by treating starch with a 54 substituted variant of Termamyl ® (which is a commercially available Bacillus lichenifor is ⁇ -amylase) .
  • the invention relates to a process for the preparation of a glucose syrup wherein starch is treated with a Termamyl-like ⁇ -amylase comprising a substitution in
  • the invention also relates to a glucose syrup obtainable by the process of the invention. Further, an aspect the invention also relates to the use of said glucose syrup obtainable by the process of the invention as ingredient in food products such as hard boiled candy, toffees, fudge, fondant and the like.
  • Another object of the invention is to provide for the use of a Termamyl-like ⁇ -amylase with a substitution in position Val54 using SEQ ID NO: 2 as the backbone (i.e., parent enzyme) or a corresponding position in another Termamyl-like ⁇ -amylase for preparing glucose syrup.
  • Figure 1 shown the sugar spectrum of a 42 DE acid converted glucose syrup .
  • Figure 2 shows the sugar spectrum of a Termamyl ® ⁇ i . e . , Bacillus licheniformis ⁇ -amylase from Novo Nordisk shown in SEQ ID NO: 2) converted glucose syrup.
  • Figure 3 shows the sugar spectrum of a V54 substituted Bacillus licheniformis ⁇ -amylase variant converted glucose syrup of the invention.
  • Figure 4 is an alignment of the amino acid sequences of six parent Termamyl-like ⁇ -amylases.
  • the numbers on the Extreme left designate the respective amino acid sequences as follows: 1: Bacillus sp . ⁇ -amylase, 2: Kaoamyl ⁇ -amylase), 3: Bacillus sp . ⁇ -amylase,
  • B amyloliquefaciens ⁇ -amylase (BAN) (SEQ ID NO: 3), 5: Bacillus licheniformis ⁇ -amylase (SEQ ID NO: 2), 6: ⁇ -amylase disclosed in Tsukamoto et al . , Biochemical and Biophysical Research Communications, 151 (1988), pp. 25-31.
  • BAN amyloliquefaciens ⁇ -amylase
  • 5 Bacillus licheniformis ⁇ -amylase (SEQ ID NO: 2)
  • 6 ⁇ -amylase disclosed in Tsukamoto et al . , Biochemical and Biophysical Research Communications, 151 (1988), pp. 25-31.
  • the present invention is based on the finding that a novel glucose syrup with a DE in the range from 35 to 45 having a sugar spectrum and properties close to that of the traditionally acid converted glucose syrup, often referred to as "42 DE glucose syrup” is obtained by treating starch with a Val54Trp (V54 ) substituted variants of the commercially available Bacillus licheniformis ⁇ -amylase, sold under the trade name Termamyl ® (Novo Nordisk) .
  • V54 Val54Trp
  • Termamyl ® Novo Nordisk
  • Val54 substituted variant can be used to preparing a syrup ⁇ - from starch having a sugar spectrum which is close to that of an acid converted 42 DE glucose syrup as a glucose syrup prepared from starch treated with parent B . li cheniformis ⁇ - amylase (SEQ ID NO: 2) has a sugar spectrum quite different therefrom.
  • the invention relates to a glucose syrup (or speciality syrup) prepared by treating starch with the Bacillus licheniformis ⁇ -amylase shown in SEQ ID NO: 2 comprising a substitution in position Val54 or a Termamyl-like ⁇ -amylase (as defined below) substituted in a position corresponding to Val54 of SEQ ID NO: 2.
  • the glucose syrup of the invention has properties close to that of the traditional acid converted 42 DE syrups with regard to its sugar spectrum, i . e . , composition of dextrose (DPI), maltose (DP2) , maltotriose (DP3) , maltotetraose (DP4) , maltopentaose (DP5) and a number of higher sugars such as DP10 etc.
  • DPI dextrose
  • DP2 maltose
  • DP3 maltotriose
  • DP4 maltopentaose
  • DP5 maltopentaose
  • the rheological properties such as the viscosity, resembles the traditional acid converted DE 42 syrup much closer than a corresponding syrup prepared under the same conditions by treatment with parent B . licheniformis ⁇ -amylase ⁇ i . e . , SEQ ID NO: 2) .
  • Val54 substituted Bacillus licheniformis ⁇ - amylase variant for preparing a glucose syrup of the invention it can be seen that especially the DPI and DP4 sugar content has been increased to a level closer to that of the traditional 42 DE acid converted glucose syrup and the DP5 sugar content has been decreased to a level closer to that of the 42 DE glucose syrup in comparison to the corresponding glucose syrup prepared using parent B. licheniformis ⁇ -amylase. Further, the content of the higher sugars, as can be seen by comparing the peak(s) on the left side of Figures 1 to 3 , are also increased to a level closer to that of the acid converted 42 DE glucose syrup in comparison to corresponding parent B . licheniformis ⁇ -amylase converted starch glucose syrup.
  • the glucose syrup of the invention may be prepared by treating starch with a Val54 substituted Termamyl-like ⁇ - amylase variant for between 20 and 100 hours, preferably 50-80 hours, especially 60-75 hours at temperature in the range around 80-105°C.
  • the pH should be in the range from pH 4-7, preferably from pH 4.5-6.5, especially around pH 5.5-6.2.
  • Termamyl-like ⁇ -amylases which generally seen have a high degree of Calcium dependency, from 20-60 ppm Ca 2+ , preferably around 40 ppm Ca 2+ should be present in the reaction slurry.
  • Enzymatic conversion of starch into a glucose syrup of the acid converted 42 DE syrup type should have a number of advantages including:
  • the Termamyl-like a-amylase may be any ⁇ -amylases produced by Bacillus spp. with a high degree of homology on the amino acid level to SEQ ID NO. 2 herein, as will be defined below.
  • Bacillus spp. with a high degree of homology on the amino acid level to SEQ ID NO. 2 herein, as will be defined below.
  • a not exhaustive list of such enzymes are the following Bacillus sp. ⁇ -amylases :
  • homologous a-amylases include an a-amylase derived from a strain of the Bacillus sp .
  • NCIB 12289, NCIB 12512, NCIB 12513 or DSM 9375 all of which are described in detail in WO 95/26397, and the a-amylase described by Tsukamoto et al . , Biochemical and Biophysical Research Communications, 151 (1988), pp. 25-31.
  • Bacillus s . ⁇ -amylases contemplated according to the present invention to be within the definition of Termamyl-like ⁇ -amylases are the ⁇ -amylases disclosed in SEQ ID NO. 1, 2, 3 and 7 of WO 96/23873 and variants thereof, including specifically the ones described in WO 96/23873.
  • the parent Termamyl-like ⁇ -amylase is a hybrid ⁇ -amylase of SEQ ID NO: 2 and SEQ ID NO: 4.
  • the parent hybrid Termamyl-like ⁇ -amylase may be identical to the Termamyl sequence, i.e., the Bacillus licheni formis ⁇ -amylase shown in SEQ ID NO : 2, except that the N- terminal 35 amino acid residues (of the mature protein) has_ been replaced by the N-terminal 33 residues of BAN (mature protein) , i.e., the Bacillus amyloliquefaciens alpha-amylase shown in SEQ ID NO: 4 (the DNA sequence of the Bacillus amyloliquefa ciens alpha-amylase is displayed in SEQ ID NO: 3), which further may have the following mutations: H156Y+A181T+N190F+A209V+Q264S (using the numbering in SEQ ID NO:
  • Termamyl-like ⁇ -amylases include the ⁇ - amylase produced by the B . licheniformis strain described in EP 0,252,666 (ATCC 27811), and the ⁇ -amylases identified in WO
  • Termamyl-like ⁇ -amylases are OptithermTM and TakathermTM (available from Sol- vay) , MaxamylTM (available from Gist-Brocades/Genencor) , Spezyme AATM and Spezyme Delta AATM (available from Genencor) , and Keis- taseTM (available from Daiwa) .
  • Termamyl-like a-amylase is also intended to indicate an a-amylase which, at
  • a "Termamyl-like a-amylase” is an a-amylase which has the amino acid sequence shown in SEQ ID NO: 2 herein or any ⁇ -amylase which displays at least 60%,
  • 25 such as at least 70%, e.g., at least 75%, or at least 80%, e . g. , at least 85%, at least 90% or at least 95% homology with SEQ ID NO; 2.
  • the "homology" may be determined by use of any conventional algorithm, preferably by use of the GAP progamme from the GCG
  • a structural alignment between Termamyl and a Termamyl-like ⁇ -amylase may be used to identify equivalent/corresponding positions in other Termamyl-like ⁇ -amylases.
  • One method of obtaining said structural alignment is to use the Pile Up programme from the GCG package using default values of gap penalties, i.e., a gap creation penalty of 3.0 and gap extension penalty of 0.1.
  • Other structural alignment methods include the hydrophobic cluster analysis (Gaboriaud et al . , (1987), FEBS LETTERS 224, pp. 149-155) and reverse threading (Huber, T ; Torda, AE, PROTEIN SCIENCE Vol. 7, No. 1 pp. 142-149 (1998).
  • the Termamyl-like ⁇ - amylase variant is one of the following B . licheniformis ⁇ - amylase variants (the parent B . li cheniformi s ⁇ -amylase is shown in SEQ ID NO: 2) :
  • the Termamyl-like ⁇ -amylase variant is one of the following substitutions B . licheniformis ⁇ -amylase variants with one of the following substitutions: V54W,Y or F or a Termamyl-like ⁇ -amylase variant with a substitution in a corresponding position.
  • Val54 variants may be constructed by standard techniques known in the art, including Site-directed mutagenesis a. described, e . g. , by Morinaga et al., (1984), Biotechnology 2, p.
  • Val54 variant may be expressed by cultivating a microorganism comprising a DNA sequence encoding the variant under conditions which are conducive for producing the variant. The variant may then subsequently be recovered from the resulting culture broth. Other methods known in the art may also be used. For instance WO 97/41213 discloses a suitable method for providing Val54 variants.
  • the invention also relates to a glucose syrup obtainable by the process of the invention as described above and illustrated below in the Examples section. Further, an aspect the invention also relates to the use of the glucose syrup obtainable by the process of the invention as ingredient in food products such as hard boiled candy, toffees, fudge, fondant and the like.
  • the invention relates to the use of a Termamyl-like ⁇ -amylase with a substitution in position Val54 using SEQ ID NO: 2 as the backbone or a corresponding position in another Termamyl-like ⁇ -amylase for preparing a glucose syrup.
  • the Termamyl-like variant may be any of the above mentioned.
  • the variant may be prepared as described in WO 97/41213.
  • neocuproine assay Dist, Li Flor- idana(1965) Anal. Biochem. No 368.
  • the principle of the neocuproine assay is that CuS0 4 is added to the sample, Cu ++ is reduced by the reducing sugar and the formed neocuproine complex is measured at 450 nm.
  • a glucose syrup was prepared by treating a starch slurry containing 30% DS (30% Dry Solid) waxy maize starch, 40 ppm Ca 2+ (adding as CaCl 2 ) at pH 6.0 with 0.1 mg enzyme protein/g DS of Val54Trp substituted Bacillus licheniformis ⁇ -amylase. The temperature was kept at 95°C for one hour and 80°C for 72 hours .
  • the sugar profile of the prepared glucose syrup after 20 and 72 hours of treatment is shown in the Table 1 below:
  • Table 1 Sugar profile after 20 and 72 hours of treatment with V54W substituted Bacillus licheniformis ⁇ -amylase. The DE of the obtained syrup is also given.
  • Figure 3 shows the sugar spectrum of the glucose syrup obtained by treating a pre-cooked 5% Waxy maize starch substrate with a Val54Trp substituted Bacillus licheniformis ⁇ -amylase at 60°C for 24 hours.
  • Figure 2 shows the sugar spectrum of a 12

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Abstract

La présente invention concerne un procédé de préparation d'un sirop de glucose dans lequel l'amidon est traité avec une α-amylase de type Termamyl présentant une substitution en Val54 illustrée dans la SEQ ID No 2, ou dans la position correspondante dans une autre α-amylase de type Termamyl. L'invention concerne également un sirop de glucose pouvant être obtenu par le procédé de l'invention et son utilisation en tant qu'ingrédient dans des produits alimentaires. L'invention concerne en outre l'utilisation d'une α-amylase de type Termamyl avec une substitution en position Val54 utilisant la SEQ ID No 2 comme squelette ou une position correspondante dans une autre α-amylase de type Termamyl pour préparer du sirop de glucose.
EP99906094A 1998-03-09 1999-03-08 Preparation enzymatique de sirop de glucose a partir d'amidon Withdrawn EP1062359A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK32198 1998-03-09
DK32198 1998-03-09
PCT/DK1999/000114 WO1999046399A1 (fr) 1998-03-09 1999-03-08 Preparation enzymatique de sirop de glucose a partir d'amidon

Publications (1)

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EP1062359A1 true EP1062359A1 (fr) 2000-12-27

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EP (1) EP1062359A1 (fr)
JP (1) JP2002505885A (fr)
KR (1) KR20010041617A (fr)
AR (1) AR020058A1 (fr)
AU (1) AU2612499A (fr)
CA (1) CA2323068A1 (fr)
WO (1) WO1999046399A1 (fr)

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EP4363565A1 (fr) 2021-06-30 2024-05-08 Danisco US Inc. Variants de lipases et leurs utilisations
WO2023034486A2 (fr) 2021-09-03 2023-03-09 Danisco Us Inc. Compositions de blanchisserie pour le nettoyage
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WO2023114936A2 (fr) 2021-12-16 2023-06-22 Danisco Us Inc. Variants de subtilisine et procédés d'utilisation
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AU2612499A (en) 1999-09-27
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WO1999046399A1 (fr) 1999-09-16
JP2002505885A (ja) 2002-02-26
CA2323068A1 (fr) 1999-09-16

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