JP7102514B2 - 微生物を用いたポリ(3-ヒドロキシプロピオネート-b-ラクテート)ブロック共重合体 - Google Patents
微生物を用いたポリ(3-ヒドロキシプロピオネート-b-ラクテート)ブロック共重合体 Download PDFInfo
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Description
本出願は2018年3月15日付韓国特許出願第10-2018-0030522号に基づいた優先権の利益を主張し、当該韓国特許出願の文献に開示された全ての内容は本明細書の一部として含まれる。
(a)乳酸を生合成しないように改良された組換え微生物を3-ヒドロキシプロピオニルCoA(3-hydroxypropionyl-CoA)生合成遺伝子およびポリヒドロキシアルカノエート(polyhydroxyalkanoate:PHA)合成酵素遺伝子を含むベクター、およびラクテート生合成遺伝子およびラクテート(lactate)をラクチルCoA(lactyl-CoA)に転換する酵素の遺伝子を含むベクターで形質転換させて組換え微生物を製造する段階;
(b)前記段階(a)で製造された組換え微生物をグリセロールを炭素源として使用して培養してP(3HP)を合成する段階;
(c)IPTGおよびグルコースを投入してP(3HP)生産を抑制し、ラクテート生合成酵素および乳酸をラクチルCoA(lactyl-CoA)転換酵素が発現されるようにして段階(a)で合成されたP(3HP)末端にPLAを生合成させる段階。
[反応式1]
アセチルCoA(acetyl-CoA)+プロピノエート(propinoate)⇔アセテート(acetate)+プロピオニルCoA(propionyl-CoA)。
(a)配列番号17の塩基配列;
(b)配列番号17の塩基配列でA1200G(1200番目塩基であるAがGで置換された変異を意味する;以下記載される塩基配列変異表現に同様に適用される)の変異を含む塩基配列;
(c)配列番号17の塩基配列でT78C、T669C、A1125GおよびT1158Cの変異を含む塩基配列;
(d)配列番号17の塩基配列でA1200Gの変異を含み、配列番号17と対応するアミノ酸配列でG335A(335番目アミノ酸GlyがAlaで置換された変異を意味する、以下記載されるアミノ酸配列変異表現に同様に適用される)の変異を含むアミノ酸配列をコーディングする塩基配列;
(e)配列番号17の塩基配列でA1200Gの変異を含み、配列番号17と対応するアミノ酸配列でA243Tの変異が含まれているアミノ酸配列をコーディングする塩基配列;
(f)配列番号17の塩基配列でT669C、A1125GおよびT1158Cの変異を含み、配列番号17と対応するアミノ酸配列でD65Gの変異を含むアミノ酸配列をコーディングする塩基配列;
(g)配列番号17の塩基配列でA1200Gの変異を含み、配列番号17と対応するアミノ酸配列でD257Nの変異を含むアミノ酸配列をコーディングする塩基配列;
(h)配列番号17の塩基配列でT669C、A1125GおよびT1158Cの変異を含み、配列番号17と対応するアミノ酸配列でD65Nの変異を含むアミノ酸配列をコーディングする塩基配列;
(i)配列番号17の塩基配列でT669C、A1125GおよびT1158Cの変異を含み、配列番号17と対応するアミノ酸配列でT199Iの変異を含むアミノ酸配列をコーディングする塩基配列;および
(j)配列番号17の塩基配列でT78C、T669C、A1125GおよびT1158Cの変異を含み、配列番号17と対応するアミノ酸配列でV193Aの変異を含むアミノ酸配列をコーディングする塩基配列
からなる群より選択された塩基配列を含むものであってもよく、前記プロピオニルCoA転移酵素は前記塩基配列によってコーディングされるアミノ酸配列を含むものであってもよい。
全てのDNAクローニング実験は、標準方法(参考文献:J.Sambrook、E.F.Fritsch、T.Maniatis、Molecular Cloning.A laboratory Manual、2nd Ed.Cold Spring Harbor Laboratory Press、Cold Spring Harbor、New York、1989)によって行った。
pCDFduetTM-1(Novagen、USA、3.7kb)にはIPTGによって発現が誘導されるT7プロモーターを二つ含有している。本実験ではこれを除去して恒常的に発現されるプロモーター二つを挿入した。pCDFduetTM-1のDNA断片をXbaI/XhoIで切断し、恒常的に発現されるJ23101(配列番号19)とJ23108プロモーター(配列番号20)の配列を含むDNA断片をXbaI/XhoI認識部位に挿入して製作した。J23101とJ23108プロモーターの配列を含む挿入したDNA断片(プロモーター)の大きさは328bp(配列番号21)である。J23101とJ23108プロモーター挿入のために、XbaI/XhoI認識部位が添加されたプライマー[5’-TACTGAACCGCTCTAGATTTACAGCTAGC-3’(配列番号22)および5’-CTTTACCAGACTCGAGTTCGAAGACGTCA-3’(配列番号23)]を用いた。このようなpCDFJ23ベクターの製作方法を図1に示した。
プロピオニルCoAトランスフェラーゼ遺伝子(pct)は、クロストリジウムプロピオニクム(Clostridium propionicum)由来のプロピオニルCoAトランスフェラーゼ(CP-PCT)の変異体を使用し、ラクテートデヒドロゲナーゼ遺伝子はペディオコッカスアシディラクティシ(Pediococcus acidilactici)由来の遺伝子を使用した。この時使用されたベクターは、IPTG誘導(induction)システムであるTrcプロモーターを含有するpTricHisB(Invitrogen Co.、USA)である。
2.1.ldhA遺伝子がノックアウト(knock-out)された変異体製作
Escherichia coli XL1-Blue(Stratagene、USA)を基にしてラクテートが含まれていない重合体を生産するために大腸菌の代謝過程中にラクテート生産に関与するEscherichia coli XL1-blue由来D-ラクテートデヒドロゲナーゼ遺伝子(ldhA;fermentative D-lactate dehydrogenase、NAD-dependent[Escherichia coli str.K-12 substr.]Gene accession number:NC_000913.3、酵素accession number:EC_1.1.1.28)をゲノムDNAからノックアウト(knock-out)させて、ldhAが欠失された大腸菌変異体E.coli XL1-Blue(ΔldhA)を製作した。遺伝子の欠失は業界によく知られているred-recombination方法を用いた。ldhAを欠失させるために使用されたオリゴマーは、配列番号36(5’-atcagcgtacccgtgatgctaacttctctctggaaggtctgaccggctttaattaaccctcactaaagggcg-3’)および配列番号37(5’-acaccgattttaccggtaccgataacgcctgccgttttgccatacatagttaatacgactcactatagggctc-3’)の塩基配列で合成した。
前記実施例2.1で製作されたldhA欠失大腸菌変異体E.coli XL1-Blue(ΔldhA)に実施例1.1および1.2で製作された組換えベクターpCDFJ23-dhaB123-gdrAB-pduP-reC_GKおよびpTrcHisB-ldhD-CPPCT540を用いて、電気穿孔法(electroporation)で形質転換させて、P(LA-b-3HP)ブロック共重合体製造用組換え菌株を製作した。
前記実施例2.2で準備された組換え菌株を下記のように2段階培養して3-ヒドロキシプロピオネート-ラクテートブロック共重合体を得た。
本発明による製造方法と比較するために、IPTG inductionを用いずに1段階の培養で3-ヒドロキシプロピオネート重合体を製造した。具体的に、別途のフラスコに実施例2.2で準備された形質転換組換え大腸菌を100mg/Lのアンピシリン、25mg/Lのストレプトマイシン、グリセロール20g/L、およびVitamin B12 0.5mΜが追加的に含まれている100ml MR培地(培地1L当りKH2PO4 6.67g、(NH4)2HPO4 4g、MgSO4・7H2O 0.8g、citric acid 0.8g、およびtrace metal solution 5mL;ここで、Trace metal solutionは1L当り5M HCl 5mL、FeSO4・7H2O 10g、CaCl2 2g、ZnSO4・7H2O 2.2g、MnSO4・4H2O 0.5g、CuSO4・5H2O 1g、(NH4)6Mo7O2・4H2O 0.1g、およびNa2B4O2・10H2O 0.02g含有)に接種して30℃で250rpmで攪拌しながら総計4日間培養した。
前記実施例3.によるIPTG誘導を経た培養液および比較例1のIPTG誘導を経なかった培養液をそれぞれ4℃、4000rpmで10分間遠心分離して菌体を回収し十分な量の蒸留水で2回洗浄した後、80℃で12時間乾燥した。乾燥された菌体内の高分子含量および組成を確認するためにGC分析を行った。このために、湿気が除去された菌体を定量した後、100℃でクロロホルムを溶媒として使用して硫酸触媒下でメタノールと反応させた。これを常温でクロロホルムの半分に該当する体積の蒸留水を添加して混合した後、二つの層に分離されるまで静置させた。二つの層のうちのメチル化された高分子の単量体が溶けているクロロホルム層を採取してガスクロマトグラフィー(GC)で高分子の成分を分析した。内部標準物質としてはベンゾエート(benzoate)を使用した。この時使用されたGC条件は下記の表1のとおりである。
前記のように製造された重合体がP(3HP-b-LA)ブロック共重合体なのかを確認するために、P(3HP-r-LA)ランダム共重合体と共に示差走査熱量計(DSC Q100、TA Instrument)を使用して試験して結果を比較した。
Claims (9)
- (a)乳酸を生合成しないように改良された組換え微生物を3-ヒドロキシプロピオニルCoA(3-hydroxypropionyl-CoA)生合成遺伝子およびポリヒドロキシアルカノエート(polyhydroxyalkanoate:PHA)合成酵素遺伝子を含むベクター、およびラクテート生合成遺伝子およびラクテート(lactate)をラクチルCoA(lactyl-CoA)に転換する酵素の遺伝子を含むベクターで形質転換させて組換え微生物を製造する段階;
(b)前記段階(a)で製造された組換え微生物をグリセロールを炭素源として使用して培養してポリ(3-ヒドロキシプロピオネート)[P(3HP)]を合成する段階;
(c)IPTGおよびグルコースを投入してP(3HP)生産を抑制し、ラクテート生合成酵素およびラクテートをラクチルCoA(lactyl-CoA)に転換する酵素が発現されるようにして段階(a)で合成されたP(3HP)末端にPLAを生合成させる段階;
を含み、
ラクテート生合成遺伝子およびラクテート(lactate)をラクチルCoA(lactyl-CoA)に転換する酵素の遺伝子がIPTG誘導システムの制御下に置かれる、
3-ヒドロキシプロピオネート-ラクテートブロック共重合体[P(3HP-b-LA)]の製造方法。 - 前記乳酸を生合成しない組換え微生物は、ラクテート脱水素酵素Aコーディング遺伝子(ldhA)が不活性化されたものである、請求項1に記載の製造方法。
- 前記3-ヒドロキシプロピオニルCoA(3-hydroxypropionyl-CoA)生合成遺伝子は、グリセロールデヒドラターゼ、グリセロールデヒドラターゼアクチバーゼ、CoA-依存プロピオンアルデヒドデヒドロゲナーゼおよびアルデヒドデヒドロゲナーゼをコーディングする遺伝子である、請求項1または2に記載の製造方法。
- 前記ポリヒドロキシアルカノエート(polyhydroxyalkanoate:PHA)合成酵素遺伝子は、キュープリアビダスネカター(Cupriavidus necator)に由来したPHA合成酵素変異体のコーディング遺伝子reC_GKである、請求項1から3のいずれか一項に記載の製造方法。
- 前記ラクテート生合成遺伝子は、ペディオコッカスアシディラクティシ(Pediococcus acidilactici)に由来したラクテート脱水素酵素(Ldh)をコーディングする遺伝子である、請求項1から4のいずれか一項に記載の製造方法。
- 前記ラクテート(lactate)をラクチルCoA(lactyl-CoA)に転換する酵素は、クロストリジウムプロピオニクム(Clostridium propionicum)に由来したものである、請求項1から5のいずれか一項に記載の製造方法。
- 前記微生物は、大腸菌である、請求項1から6のいずれか一項に記載の製造方法。
- 前記段階(c)で、0.1~1.0mMのIPTGを投入する、請求項1から6のいずれか一項に記載の製造方法。
- 乳酸を生合成しないように改良された組換え微生物に3-ヒドロキシプロピオニルCoA(3-hydroxypropionyl-CoA)生合成遺伝子およびポリヒドロキシアルカノエート(polyhydroxyalkanoate:PHA)合成酵素遺伝子を含むベクター、およびラクテート生合成遺伝子およびラクテート(lactate)をラクチルCoA(lactyl-CoA)に転換する酵素の遺伝子を含むベクターであって、
ラクテート生合成遺伝子およびラクテート(lactate)をラクチルCoA(lactyl-CoA)に転換する酵素の遺伝子がIPTG誘導システムの制御下に置かれるベクターで形質転換された、組換え微生物。
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