JP7394868B2 - L-ヒスチジン生産能が強化された微生物及びそれを用いたヒスチジン生産方法 - Google Patents
L-ヒスチジン生産能が強化された微生物及びそれを用いたヒスチジン生産方法 Download PDFInfo
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- JP7394868B2 JP7394868B2 JP2021562963A JP2021562963A JP7394868B2 JP 7394868 B2 JP7394868 B2 JP 7394868B2 JP 2021562963 A JP2021562963 A JP 2021562963A JP 2021562963 A JP2021562963 A JP 2021562963A JP 7394868 B2 JP7394868 B2 JP 7394868B2
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Description
ヒスチジン高生産能人工突然変異株の作製
L-ヒスチジンの高生産能を有する人工突然変異株を得るために、次の方法により微生物の変異を誘導した。
<活性化培地>
肉汁1%,ポリペプトン1%,塩化ナトリウム0.5%,酵母エキス1%,寒天2%,pH7.2
<種培地>
グルコース5%,バクトペプトン1%,塩化ナトリウム0.25%,酵母エキス1%,尿素0.4%,pH7.2
<最小培地>
グルコース1.0%,硫酸アンモニウム0.4%,硫酸マグネシウム0.04%,リン酸二水素カリウム0.1%,尿素0.1%,チアミン0.001%,ビオチン200μg/L,寒天2%,pH7.0
<生産培地>
グルコース5%,硫酸アンモニウム2%,リン酸二水素カリウム0.1%,硫酸マグネシウム7水塩0.05%,CSL(トウモロコシ浸漬液)2.0%,ビオチン200μg/L,炭酸カルシウム,pH7.2
コリネバクテリウム・アンモニアゲネス由来グリシントランスポーター(CycA(Cam))導入ベクターの作製
コリネバクテリウム・グルタミカム染色体内にコリネバクテリウム・アンモニアゲネス由来CycAタンパク質(以下、CycA(Cam)、配列番号1)をコードする遺伝子cycA(以下、cycA(cam)、配列番号2)を挿入するために、コリネバクテリウム・グルタミカムにおいてpurUを挿入siteとして用いた(非特許文献10)。purU欠損及びターゲット遺伝子挿入ベクターを作製するために、ATCC13032の染色体を鋳型とし、配列番号3及び配列番号4、配列番号5及び配列番号6のプライマー対を用いてPCRをそれぞれ行った。PCR反応のためのポリメラーゼとしては、PfuUltraTMハイフィデリティDNAポリメラーゼ(Stratagene)を用いた。PCR条件は、95℃で30秒間の変性、55℃で30秒間のアニーリング、72℃で2分間の重合反応を28サイクル行い、その後72℃で5分間の重合反応を行うものとした。その結果、それぞれ1606bpのdel-purU(配列番号7)と1625bpのdel-purU(配列番号8)のDNA断片が得られた。得られたDNA産物をQIAGEN社のPCR Purification kitで精製し、その後pDZ(特許文献6)ベクターとタカラ(TaKaRa)のInfusion Cloning Kitを用いてクローニングすることにより、purU欠損及びターゲット遺伝子挿入用ベクターpDZΔpurUを作製した。
CA14-0682菌株由来グリシントランスポーター導入菌株の作製及びヒスチジン生産能の評価
実施例2で作製したベクターpDZΔpurU::Pn-cycA(cam)をCA14-0682菌株に形質転換し、2次交差過程を経て、染色体上のpurU遺伝子がPn-cycA(cam)形態に置換された菌株を作製し、これをCA14-0682ΔpurU::Pn-cycA(cam)と命名した。
CycA(Cam)過剰発現組換えベクターの作製
細胞内のcycA(Cam)をより強く発現させるために、cycA(Cam)過剰発現組換えベクターを作製した。公知のコリネバクテリウム属微生物由来のプロモーターpcj7(特許文献2)と、公知のセリンヒドロキシメチルトランスフェラーゼをコードする遺伝子glyAのプロモーター(以下、PglyA)を用いた。
大腸菌由来グリシントランスポーター(CycA(Eco))導入ベクターの作製
一方、コリネバクテリウム・アンモニアゲネス由来CycAタンパク質とその活性を比較するために、公知の大腸菌K-12由来のCycAタンパク質(以下、CycA(Eco)、配列番号20)(非特許文献11)をコードする遺伝子cycA(以下、cycA(Eco)、配列番号21)をpcj7と作動可能に連結して導入するためのベクターを作製した。
CA14-0682菌株由来cycA(Cam)又はcycA(Eco)過剰発現菌株の作製及びヒスチジン生産能の比較
CA14-0682菌株を親株としてcycA(Cam)又はcycA(Eco)過剰発現菌株を作製するために、作製したベクター4種(pDZΔpurU,pDZΔpurU::pcj7-cycA(Cam),pDZΔpurU::PglyA-cycA(Cam),pDZΔpurU::pcj7-cycA(Eco))をそれぞれエレクトロポレーションによりCA14-0682菌株に形質転換し、2次交差過程を経て、染色体上のpurU欠失及びpcj7-cycA(Cam)、PglyA-cycA(Cam)又はpcj7-cycA(Eco)の形態に置換された菌株を得た。前記過程により菌株4種(CA14-0682ΔpurU,CA14-0682ΔpurU::pcj7-cycA(Cam),CA14-0682ΔpurU::PglyA-cycA(Cam),CA14-0682ΔpurU::pcj7-cycA(Eco))を作製した。
コリネバクテリウム・アンモニアゲネス由来グリシン開裂系導入ベクターの作製
まず、ヒスチジン生産能の向上にグリシントランスポーターの活性が影響を及ぼすことが確認されたので、細胞内に取り込んだグリシンの細胞内利用能をさらに向上させる場合のヒスチジン生産能を確認した。具体的には、グリシン開裂系(Glycine Cleavage System, 以下、GCV system)を導入した。コリネバクテリウム・グルタミカム菌株においてGCV systemを構成する6種のタンパク質のうちL-タンパク質、LipB、LipAをコードする遺伝子のみ知られており、他の3種のタンパク質をコードする遺伝子は知られていない。よって、コリネバクテリウム・アンモニアゲネス由来GCV systemを導入するために、P-タンパク質(配列番号26)、T-タンパク質(配列番号27)、H-タンパク質(配列番号28)、LipA(配列番号29)、LipB(配列番号30)をコードする遺伝子(gcvP(配列番号31),gcvT(配列番号32),gcvH(配列番号33),lipA(配列番号34),lipB(配列番号35))導入ベクターを作製した。前記遺伝子は、コリネバクテリウム・アンモニアゲネス染色体内に2組のオペロン(gcvP-gcvT,gcvH-lipB-lipA)を形成している(以下、gcvPT、gcvH-lipBA)。GCV systemを導入するために、コリネバクテリウム・グルタミカムのトランスポゾンをコードする遺伝子のうちNCgl2131遺伝子を挿入siteとして用いた(非特許文献10)。NCgl2131遺伝子をgcvシステム遺伝子に置換するために、NCgl2131欠損及びターゲット遺伝子挿入ベクターを作製した。ベクターを作製するために、ATCC13032の染色体を鋳型とし、配列番号36及び配列番号37、配列番号38及び配列番号39のプライマー対を用いてPCRをそれぞれ行った。PCR反応のためのポリメラーゼとしては、PfuUltraTMハイフィデリティDNAポリメラーゼ(Stratagene)を用いた。PCR条件は、95℃で30秒間の変性、55℃で30秒間のアニーリング、72℃で2分間の重合反応を28サイクル行い、その後72℃で5分間の重合反応を行うものとした。その結果、それぞれ531bpのdel-N2131L(配列番号40)と555bpのdel-N2131R(配列番号41)のDNA断片が得られた。得られたDNA産物をQIAGEN社のPCR Purification kitで精製し、その後pDZベクターとタカラ(TaKaRa)のInfusion Cloning Kitを用いてクローニングすることにより、NCgl2131遺伝子欠損及びターゲット遺伝子挿入用ベクターpDZΔN2131を作製した。
CA14-0682菌株由来グリシン開裂系及びグリシントランスポーター導入菌株の作製及びヒスチジン生産能の評価
実施例7で作製したベクターpDZΔN2131、pDZΔN2131::GCV(Cam)をCA14-0682菌株とCA14-0682-cycA(Cam)菌株に形質転換し、2次交差過程を経て、NCgl2131遺伝子欠失菌株(CA14-0682-cycA(Cam)ΔN2131)、グリシン開裂系単独導入菌株、及びグリシン開裂系とグリシントランスポーターの両方が導入された菌株2種(CA14-0682ΔN2131::GCV(Cam),CA14-0682-cycA(Cam)ΔN2131::GCV(Cam))を作製した。作製したCA14-0682-cycA(Cam)ΔN2131、CA14-0682ΔN2131::GCV(Cam)菌株、CA14-0682-cycA(Cam)ΔN2131::GCV(Cam)菌株のL-ヒスチジン生産能及びL-グリシン生成量を確認するために、実施例1と同様に培養した。
野生型コリネバクテリウム・グルタミカム由来L-ヒスチジン生産菌株の作製
次に、野生型コリネバクテリウム・グルタミカム菌株におけるCycA導入及びGCV system導入の効果を確認するために、まず、野生型のコリネバクテリウム・グルタミカムATCC13032菌株からL-ヒスチジン生産菌株を開発した。
まず、L-ヒスチジン生合成経路の最初の酵素であるHisGポリペプチドのフィードバック阻害(Feedback inhibition)を解消するために、HisGのN末端から233番目と235番目のアミノ酸をそれぞれグリシン(Glycine)からヒスチジン(histidine)(以下、G233H変異)、トレオニン(Threonine)からグルタミン(Glutamine)(以下、T235Q)に同時に置換した(配列番号48)(非特許文献12)。
次に、L-ヒスチジン生合成経路の強化のために、計4つのオペロン(operon)に分離されている生合成遺伝子をプロモーターが置換された形態のclusterに作製して導入した。具体的には、計4つのオペロン(operon)(hisE-hisG,hisA-impA-hisF-hisI,hisD-hisC-hisB,cg0911-hisN)に分離されている生合成遺伝子を公知の合成プロモーター3種(lysCP1(特許文献7)、pcj7もしくはSPL13(特許文献8))又はgapA遺伝子プロモーターと作動可能に連結し、各オペロンをclusteringして一度に導入した。挿入部位には、γ-アミノ酪酸パーミアーゼをコードするNcgl1108遺伝子(非特許文献14)を用いた。
CA14-0737菌株由来グリシントランスポーター及びグリシン開裂系導入菌株の作製
前述したように作製したベクター4種(pDZΔpurU,pDZΔpurU::PglyA-cycA(Cam),pDZΔpurU::pcj7-cycA(Cam),pDZΔpurU::pcj7-cycA(Eco))をCA14-0737菌株に形質転換し、2次交差過程を経て、purU遺伝子欠失菌株、cycA(Cam)導入菌株、cycA(Eco)導入菌株を作製し、CA14-0737ΔpurU、CA14-0737ΔpurU::PglyA-cycA(Cam)、CA14-0737ΔpurU::pcj7-cycA(Cam)、CA14-0737ΔpurU::pcj7-cycA(Eco)を作製した。作製したCA14-0737ΔpurU、CA14-0737ΔpurU::PglyA-cycA(Cam)、CA14-0737ΔpurU::pcj7-cycA(Cam)、CA14-0737ΔpurU::pcj7-cycA(Eco)菌株のL-ヒスチジン生産能及びL-グリシン生成量を確認するために、実施例1と同様に培養した。
Claims (9)
- グリシントランスポーターの活性がコリネバクテリウム・アンモニアゲネス由来のCycAタンパク質が導入されていないコリネバクテリウム・グルタミカムの活性に比べて強化された、L-ヒスチジンを生産するコリネバクテリウム・グルタミカムであって、前記グリシントランスポーターがコリネバクテリウム・アンモニアゲネス由来のCycAタンパク質である、微生物。
- 前記グリシントランスポーターは、配列番号1又はそれと90%以上の配列同一性を有するアミノ酸配列を含むものである、請求項1に記載の微生物。
- 前記微生物は、グリシン分解タンパク質の活性がコリネバクテリウム・アンモニアゲネス由来のグリシン分解タンパク質が導入されていないコリネバクテリウム・グルタミカムの活性に比べてさらに強化されたものである、請求項1に記載の微生物。
- 前記グリシン分解タンパク質は、GcvP、GcvT、GcvH、LipB及びLipAからなる群から選択される少なくとも1つのタンパク質である、請求項3に記載の微生物。
- 前記グリシン分解タンパク質は、コリネバクテリウム・アンモニアゲネス由来のものである、請求項4に記載の微生物。
- 前記GcvPは配列番号26、GcvTタンパク質は配列番号27、GcvHは配列番号28、LipAタンパク質は配列番号29、LipBタンパク質は配列番号30のアミノ酸配列を含むか、又は前記配列番号とそれぞれ90%以上の同一性を有するアミノ酸配列を含むものである、請求項4に記載の微生物。
- 請求項1~6のいずれか一項に記載の微生物を含むL-ヒスチジン生産用組成物。
- 請求項1~6のいずれか一項に記載の微生物を培地で培養するステップと、
前記微生物及び培地からL-ヒスチジンを回収するステップとを含む、L-ヒスチジン製造方法。 - グリシントランスポーターの活性が強化された請求項1~6のいずれか一項に記載の微生物のL-ヒスチジン生産における使用。
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