WO2018120069A1 - 一种酶法制备β- 烟酰胺单核苷酸的方法 - Google Patents

一种酶法制备β- 烟酰胺单核苷酸的方法 Download PDF

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WO2018120069A1
WO2018120069A1 PCT/CN2016/113623 CN2016113623W WO2018120069A1 WO 2018120069 A1 WO2018120069 A1 WO 2018120069A1 CN 2016113623 W CN2016113623 W CN 2016113623W WO 2018120069 A1 WO2018120069 A1 WO 2018120069A1
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nicotinamide
ribokinase
reaction
nicotinamide mononucleotide
mononucleotide
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陶军华
付敏杰
梁晓亮
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苏州汉酶生物技术有限公司
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    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12PFERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P19/00Preparation of compounds containing saccharide radicals
    • C12P19/26Preparation of nitrogen-containing carbohydrates
    • C12P19/28N-glycosides
    • C12P19/30Nucleotides
    • C12P19/305Pyrimidine nucleotides

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  • the invention relates to a preparation method of ⁇ -nicotinamide mononucleotide, in particular to a biological preparation method of ⁇ -nicotinamide mononucleotide.
  • --nicotinamide mononucleotide is a health care product that has been widely studied and paid attention to in recent years, and is also used to synthesize nicotinamide adenine dinucleotide (coenzyme I). Key intermediates. Beta-nicotinamide mononucleotides are reported to be anti-aging (see J Nutr Sci Vitaminol (Tokyo). 2016;62(4):272-276 ), treatment of diabetes (Cell Metab. 2011 Oct 5; 14(4): 528-536 ) There is great potential in other areas, and related health products are available for sale in Japan and the United States.
  • the traditional ⁇ -nicotinamide mononucleotide production method is obtained by phosphorylating phosphorus oxychloride with niacin ribose as a raw material (see Chem.). Commun. 1999, 729-730), low yield, low product purity, and the use of a large amount of organic solvents, which are seriously damaging to the environment, among which phosphorus oxychloride is a dangerous reagent.
  • an object of the present invention is to provide an enzymatic preparation of ⁇ - A method of nicotinamide mononucleotide which produces a high-purity ⁇ -nicotinamide mononucleotide product at a relatively low cost and in a short cycle, and which greatly reduces environmental pollution compared to conventional methods.
  • Method for preparing ⁇ -nicotinamide mononucleotide by enzymatic method, using nicotinamide ribose as substrate, in ATP In the presence of a phosphate donor, the reaction is carried out under the catalysis of nicotinamide ribokinase and/or recombinant cells containing nicotinamide ribokinase to form a ⁇ -nicotinamide mononucleotide.
  • the nicotinamide ribokinase used in the present invention is derived from Saccharomyces cerevisiae (Saccharomyces cerevisiae) ).
  • the amino acid sequence of the nicotinamide ribokinase may be at least 80% identical to the sequence 2 in the sequence listing. Consistency. Further, the amino acid sequence of nicotinamide ribokinase is at least 90% identical to Sequence 2 in the Sequence Listing. Further, the amino acid sequence of nicotinamide ribokinase and the sequence in the sequence listing 2 It is exactly the same.
  • the reaction can be carried out at a temperature of 4 ° C to 50 ° C and a pH of 5.0 to 9.0.
  • the reaction is carried out in an aqueous phase system at a temperature of from 30 ° C to 45 ° C and a pH of from 7.5 to 8.5.
  • reaction is carried out at a temperature of 33 °C.
  • reaction is allowed to proceed at pH 8.0.
  • the reaction is carried out in a triethanolamine buffer at pH 8.0.
  • the reaction is carried out under the catalysis of a recombinant cell containing nicotinamide ribokinase, which may and preferably is a microbial cell, wherein the microorganism may and preferably is Escherichia coli, Saccharomyces cerevisiae or Bi Red yeast and so on.
  • nicotinamide ribokinase which may and preferably is a microbial cell, wherein the microorganism may and preferably is Escherichia coli, Saccharomyces cerevisiae or Bi Red yeast and so on.
  • the process is carried out by adding all of the starting materials used in the reaction to the reaction vessel, mixing them well, placing them at a set temperature, and stirring the reaction.
  • the purification treatment can be used to obtain the ⁇ that meets the requirements for use.
  • - Niacinamide single nucleotide product A specific purification method is post-treatment including separation of the resin, and according to the purification method, a ⁇ -nicotinamide mononucleotide product having a purity of at least 95% can be obtained.
  • the invention adopts the above technical solution, and has the following advantages compared with the prior art:
  • the enzymatic preparation of the invention provides ⁇ - The method of nicotinamide mononucleotide has important application value.
  • the current chemical methods produce serious pollution and the reactants involved are dangerous to store and use.
  • the product obtained by the chemical reaction has many impurities and is difficult to be purified.
  • the enzymatic synthesis method of the present invention can provide a product with higher purity, is more environmentally friendly, and is easy to purify, and thus can be more economically used in health care products, medicine, and the like, and will further expand its application. range.
  • the nicotinamide ribokinase used may be present in the form of an enzyme lyophilized powder or in recombinant cells.
  • the method for obtaining nicotinamide ribokinase is as follows:
  • a recombinant Escherichia coli (or other microbial) expression strain of nicotinamide ribokinase is obtained by molecular cloning technology or genetic engineering technology, and then recombinant E. coli is fermented to prepare a recombinant cell containing nicotinamide ribokinase, or nicotinamide ribose is prepared. Lyophilized powder of kinase.
  • the steps for preparing a recombinant cell containing nicotinamide ribokinase or a lyophilized powder of nicotinamide ribokinase using a recombinant E. coli expression strain containing nicotinamide ribokinase are as follows:
  • Recombinant E. coli expression strain containing nicotinamide ribokinase was inoculated into 4 ml of liquid LB medium at a ratio of 1%, 37 Oscillate culture (200 rpm) overnight, transfer the overnight culture to 1 ml inoculum to 50 ml liquid LB medium, shake culture (200 rpm) at 37 °C.
  • the OD600 value was 0.6-0.8, and the final concentration of 0.4 mM IPTG was added to shake at 20 °C overnight.
  • Centrifuge cells after induction (8,000 rpm, 10 Min ), resuspend the cells with 5 ml of 20 mmol/L triethanolamine buffer (pH 8.0) to obtain the recombinant cells, or further ultrasonically disrupt the cells in an ice bath, and centrifuge the disrupted solution ( At 8,000 rpm, 10 min), the supernatant was collected and lyophilized to obtain the lyophilized powder.
  • triethanolamine buffer pH 8.0
  • Example 1 Preparation of recombinant Escherichia coli cells containing nicotinamide ribokinase
  • the gene synthesizes the nicotinamide ribokinase gene fragment, and NdeI and The BamHI restriction site was ligated into the pET30a vector (produced by Suzhou Jinweizhi Biotechnology Co., Ltd.) and transformed into BL21 (DE3) strain.
  • the nicotinamide ribokinase strain was inoculated into 4 ml of liquid LB medium at a ratio of 1%, and cultured at 37 °C with shaking (200 Rpm) overnight, transfer the overnight culture to 1 ml inoculum in 50 ml liquid LB medium, shake culture (200 rpm) at 37 °C until the OD600 value is reached. 0.6-0.8, and added to a final concentration of 0.4 mM IPTG and shaken at 20 °C overnight.
  • the cells were collected by centrifugation (8,000 rpm, 10 min) for 5 The cells were resuspended in ml 20 mmol/L triethanolamine buffer (pH 8.0) to obtain niacin ribose kinase-containing recombinant cells for catalysis.
  • the recombinant cells of nicotinamide ribokinase prepared in Example 1 were ultrasonically disrupted in an ice bath, and the disrupted solution was centrifuged (8,000 rpm). , 10 min), the supernatant was collected and lyophilized to obtain a lyophilized powder of nicotinamide ribokinase.
  • Example 3 Enzymatic synthesis of ⁇ -nicotinamide mononucleotide using nicotinamide ribose as substrate
  • the nicotinamide ribokinase lyophilized powder prepared according to the method of Example 2 was used to catalyze the synthesis of ?-nicotinamide mononucleotide.

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Abstract

本发明涉及一种酶法制备β - 烟酰胺单核苷酸的方法,该方法以烟酰胺核糖为底物,在磷酸基供体存在下,在烟酰胺核糖激酶和 / 或含有烟酰胺核糖激酶的重组细胞的催化下反应生成β- 烟酰胺单核苷酸。本发明提供的酶法制备β - 烟酰胺单核苷酸的方法具有重要的应用价值。与已有化学合成β - 烟酰胺单核苷酸的技术相比,本发明方法更加环保,成本更低,且可提供纯度更高的产品,因而能更经济的用于保健品及生物医药领域。

Description

一种酶法制备 β- 烟酰胺单核苷酸的方法
技术领域
本发明涉及一种 β- 烟酰胺单核苷酸的制备方法,特别涉及一种 β- 烟酰胺单核苷酸的生物制备方法。
背景技术
β- 烟酰胺单核苷酸是一种近年来受到广泛研究和关注的保健品,也是用来合成烟酰胺腺嘌呤二核苷酸(辅酶 I )的关键中间体。据报道 β- 烟酰胺单核苷酸在抗衰老(参见 J Nutr Sci Vitaminol (Tokyo). 2016;62(4):272-276 ),治疗糖尿病( Cell Metab. 2011 Oct 5; 14(4): 528-536 )等方面有巨大潜力,在日本和美国均有相关的保健品上市销售。
传统的 β- 烟酰胺单核苷酸生产方法是以烟酰胺核糖为原料,用三氯氧磷进行磷酸化得到(参见 Chem. Commun. 1999, 729-730 ),得率低,产品纯度低,而且用到大量的有机溶剂,对环境破坏严重,其中三氯氧磷是比较危险的试剂。
发明内容
针对上述问题,本发明的目的是提供一种酶法制备β - 烟酰胺单核苷酸的方法,该方法可以较低的成本、较短的周期生产出高纯度的β - 烟酰胺单核苷酸产品,并且对环境污染相对传统方法大为减少。
为达到上述目的,本发明采用的技术方案如下:
一种酶法制备β - 烟酰胺单核苷酸的方法,该方法以烟酰胺核糖为底物,在 ATP 等磷酸供体存在下,在烟酰胺核糖激酶和 / 或含有烟酰胺核糖激酶的重组细胞的催化下反应生成β - 烟酰胺单核苷酸。
优选地,本发明所用的烟酰胺核糖激酶来自酿酒酵母( Saccharomyces cerevisiae )。
更优选地,烟酰胺核糖激酶的氨基酸序列可以与序列表中的序列 2 具有至少 80% 的一致性。进一步地,烟酰胺核糖激酶的氨基酸序列与序列表中的序列 2 具有至少 90% 的一致性。更进一步地,烟酰胺核糖激酶的氨基酸序列与序列表中的序列 2 完全一致。
根据本发明,可以使所述反应在温度 4 ℃ ~50 ℃以及 pH 5.0~9.0 的水相体系中进行。优选地,使所述反应在温度 30 ℃ ~45 ℃以及 pH 7.5~8.5 的水相体系中进行。
更优选地,使反应在温度 33 ℃下进行。
更优选地,使反应在 pH 8.0 下进行。
根据一个具体优选方面,使反应在 pH 8.0 的三乙醇胺缓冲液中进行。
根据本发明,所述的反应在含有烟酰胺核糖激酶的重组细胞的催化下进行,所述的重组细胞可以且优选为微生物细胞,其中微生物可以且优选为大肠埃希氏杆菌、酿酒酵母或毕赤酵母等。
根据一个具体和优选方面,所述方法实施如下:将反应所用的全部原料加入到反应釜中,混合均匀后,置于设定温度下,搅拌反应。反应完毕后,通过提纯处理即可获得达到使用要求的β - 烟酰胺单核苷酸产品。一个具体的提纯方法是经包括树脂分离在内的后处理,按照该提纯方法,可获得纯度高达 95% 以上的β - 烟酰胺单核苷酸产品。
本发明采用上述技术方案,相比现有技术具有如下优点:
本发明提供的酶法制备β - 烟酰胺单核苷酸的方法具有重要的应用价值。目前的化学方法产生的污染严重,所涉及的反应物在储存和使用时都有危险性。化学方法反应得到的产品杂质多,难于纯化。相比之下,采用本发明的酶法合成方法能够提供纯度更高的产品,对环境更友好,便于纯化,因而能更经济的用于保健品、医药等领域,而且将会进一步扩大其应用范围。
具体实施方式
下面对本发明的较佳实施例进行详细阐述,以使本发明的优点和特征能更易于被本领域的技术人员理解。
根据本发明,所用的烟酰胺核糖激酶可以酶冻干粉形式存在或存在于重组细胞中。
烟酰胺核糖激酶的获得方法如下:
利用分子克隆技术、基因工程技术获得烟酰胺核糖激酶的重组大肠杆菌(或其它微生物菌)表达菌株,然后将重组大肠杆菌发酵,制备得到含有烟酰胺核糖激酶的重组细胞,或者制备得到烟酰胺核糖激酶的冻干粉。
本发明所述的分子克隆技术和基因工程技术均是已知的。分子克隆技术可参见《分子克隆实验指南》第三版( J. 沙姆布鲁克著 ,2005 )。
采用基因工程技术构建本发明重组菌株的表达步骤如下:
( 1 )根据 Genbank NM_001182967.1 序列优化密码子后基因合成所需的基因片段,连入 pET30a 载体,两端分别加上 NdeI 和 BamHI 酶切位点;
( 2 )将重组质粒转化进入大肠杆菌 BL21 ( DE3 )中,利用 IPTG 诱导目的蛋白表达,得到烟酰胺核糖激酶的重组大肠杆菌表达菌株。
利用含有烟酰胺核糖激酶的重组大肠杆菌表达菌株制备含有烟酰胺核糖激酶的重组细胞,或者烟酰胺核糖激酶的冻干粉的步骤如下:
以 1% 比例将含有烟酰胺核糖激酶的重组大肠杆菌表达菌株接种到 4ml 液体 LB 培养基中, 37 ℃振荡培养( 200 rpm )过夜,取过夜培养物以 1% 接种量转接于 50 ml 液体 LB 培养基, 37 ℃振荡培养( 200 rpm )至 OD600 值达到 0.6-0.8 ,加入终浓度 0.4 mM IPTG 于 20 ℃振荡培养过夜。诱导结束后离心收集细胞( 8,000 rpm , 10 min ),用 5 ml 20 mmol/L 三乙醇胺缓冲液( pH8.0 )重悬细胞,获得所述重组细胞,或进一步于冰浴中超声波破碎细胞,将破碎液离心( 8,000 rpm , 10 min ),收集上清液冻干,获得所述冻干粉。
以下结合具体的实施例对本发明作更为详细的描述。
实施例 1 :制备含烟酰胺核糖激酶的重组大肠杆菌细胞
根据序列表中的序列 1 及序列 2 ,基因合成烟酰胺核糖激酶基因片段,两端分别加上 NdeI 和 BamHI 酶切位点,连入 pET30a 载体(苏州金唯智生物技术有限公司生产),转化 BL21 ( DE3 )菌株。
以 1% 比例将烟酰胺核糖激酶菌种接种到 4 ml 液体 LB 培养基, 37 ℃振荡培养( 200 rpm )过夜,取过夜培养物以 1% 接种量转接于 50 ml 液体 LB 培养基, 37 ℃振荡培养( 200 rpm )至 OD600 值达到 0.6-0.8 ,加入终浓度 0.4 mM IPTG 于 20 ℃振荡培养过夜。诱导结束后离心收集细胞( 8,000 rpm , 10 min ),用 5 ml 20 mmol/L 三乙醇胺缓冲液( pH8.0 )重悬细胞,获得含烟酰胺核糖激酶的重组细胞用于催化。
实施例 2 :制备烟酰胺核糖激酶冻干粉
将实施例 1 中制得的烟酰胺核糖激酶的重组细胞于冰浴中超声波破碎细胞,将破碎液离心( 8,000 rpm , 10 min ),收集上清液冻干,获得烟酰胺核糖激酶的冻干粉。
实施例 3 :以烟酰胺核糖为底物酶法合成β - 烟酰胺单核苷酸
在本实施例中,按照实施例 2 方法制备的烟酰胺核糖激酶冻干粉被用于催化合成β - 烟酰胺单核苷酸。
在反应体系中依次加入 1 L 20 mmol/L 三乙醇胺缓冲液( pH8.0 )、终浓度 18mM 烟酰胺核糖、终浓度 20mM 的 ATP 、终浓度 20mM 的 MgCl2 、烟酰胺核糖激酶冻干粉 5 g 混合均匀后置于 33 ℃水浴, 300 rpm 搅拌反应 24 h 。反应结束后用高效液相色谱检测烟酰胺核糖转化率为 90% 以上。经离子交换树脂分离、冻干等后处理纯化后得到β - 烟酰胺单核苷酸 4.9g ,纯度大于 95% 。
上述实施例只为说明本发明的技术构思及特点,是一种优选的实施例,其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施,并不能以此限制本发明的保护范围。凡根据本发明的精神实质所作的等效变化或修饰,都应涵盖在本发明的保护范围之内。

Claims (10)

  1. 一种酶法制备 β- 烟酰胺单核苷酸的方法,其特征在于:该方法以烟酰胺核糖为底物,在磷酸基供体存在下,在烟酰胺核糖激酶和 / 或含有烟酰胺核糖激酶的重组细胞的催化下反应生成 β- 烟酰胺单核苷酸。
  2. 根据权利要求 1 所述的方法,其特征在于:所述的磷酸基供体为 ATP 。
  3. 根据权利要求 1 所述的方法,其特征在于:所述的烟酰胺核糖激酶来自酿酒酵母。
  4. 根据权利要求 3 所述的方法,其特征在于:所述的烟酰胺核糖激酶的氨基酸序列与序列表中的序列 2 具有至少 80% 的一致性。
  5. 根据权利要求 4 所述的方法,其特征在于:所述的烟酰胺核糖激酶的氨基酸序列与序列表中的序列 2 具有至少 90% 的一致性。
  6. 根据权利要求 1 所述的方法,其特征在于:使所述的反应在温度为 30~40 ℃ 以及 pH 为 7.5~8.5 的水相体系中进行。
  7. 根据权利要求 6 所述的方法,其特征在于:使所述的反应在三乙醇胺缓冲液中进行。
  8. 根据权利要求 7 所述的方法,其特征在于:将所述的反应所用的全部原料加入到反应釜中,混合均匀后,置于设定温度下,搅拌反应。
  9. 根据权利要求 1 所述的方法,其特征在于:所述的反应在含有烟酰胺核糖激酶的重组细胞的催化下进行,所述的重组细胞为微生物细胞。
  10. 根据权利要求 9 所述的方法,其特征在于:所述的微生物为大肠埃希氏杆菌、酿酒酵母或毕赤酵母。
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US10392416B2 (en) 2015-10-02 2019-08-27 Metro International Biotech, Llc Crystal forms of beta-nicotinamide mononucleotide
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