JP5878396B2 - 新規プロモーター及びその利用 - Google Patents
新規プロモーター及びその利用 Download PDFInfo
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- JP5878396B2 JP5878396B2 JP2012046539A JP2012046539A JP5878396B2 JP 5878396 B2 JP5878396 B2 JP 5878396B2 JP 2012046539 A JP2012046539 A JP 2012046539A JP 2012046539 A JP2012046539 A JP 2012046539A JP 5878396 B2 JP5878396 B2 JP 5878396B2
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Description
(2)クリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)の染色体におけるCTR1遺伝子の上流に位置し、当該CTR1遺伝子の発現を制御している領域からなるプロモーター。
(4)少なくとも、配列番号1に示す塩基配列の3'末端側の2000塩基を含む塩基配列からなることを特徴とする(1)記載のプロモーター。
(6)少なくとも、配列番号2に示す塩基配列の3'末端側の429塩基を含む塩基配列からなることを特徴とする(2)記載のプロモーター。
(8)(1)乃至(6)いずれか一記載のプロモーターを含む発現ベクター。
(9)上記プロモーターの下流に位置する遺伝子を更に含むことを特徴とする(8)記載の発現ベクター。
(11)上記所望の遺伝子が外来性の遺伝子であることを特徴とする(10)記載の形質転換体。
(13)セルロース系バイオマスを糖化し、且つエタノール発酵能を有することを特徴とする(10)記載の形質転換体。
(15)上記目的物質は、セルロース系バイオマスを糖化してなる糖類からエタノール発酵により合成されたエタノールであることを特徴とする(14)記載の物質の製造方法。
本発明に係るプロモーターは、クリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)におけるPIR1遺伝子のプロモーター及びCTR1遺伝子のプロモーターである。クリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)におけるPIR1遺伝子のプロモーターとは、クリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)の染色体上における、PIR1遺伝子の発現を制御している領域を意味する。同様に、クリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)におけるCTR1遺伝子のプロモーターとは、クリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)の染色体上における、CTR1遺伝子の発現を制御している領域を意味する。
〔実施例1〕
本実施例では、耐熱性酵母であるクリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)におけるPIR1遺伝子のプロモーター及びCTR1遺伝子のプロモーターを単離し、レポーターアッセイ法によりプロモーター活性を評価した。
本実施例では、実施例1で評価したK. marxianusのPIR1プロモーター及びK. marxianusのCTR1プロモーターについて、その機能領域を検討した。
本実施例では、実施例1で評価したK. marxianusのPIR1プロモーター及びK. marxianusのCTR1プロモーターを、外来遺伝子を耐熱性酵母に導入する際のプロモーターとして利用し、そのプロモーター活性を評価した。
Kluyveromyces marxianus DMKU3-1042株(RAK3596とも称する)のxyl1破壊株RAK6163(xyl1::ScURA3, leu2, his3)のxyl2遺伝子を破壊し、同時にキシロースイソメラーゼ(XI)遺伝子を導入するためのベクターを下記の方法で作製した。なお、XI遺伝子としてはSaccharomyces cerevisiaeで活性があることがわかっている特開2011-147445に記載のReticulitermes speratus腸内共生原生生物由来のXI遺伝子を、酵母のコドン使用頻度に合わせて全合成したRsXI-C1-opt(以下RsXI)遺伝子を用いた。また、PCR増幅にはPrimeSTAR Max DNA Polymerase(Takara Bio, Shiga, Japan)を添付のプロトコルに従い使用した。
K. marxianus DMKU3-1042株のゲノムDNAを鋳型として、プライマーBss-XYL2U-F(gtaaaacgacggccagtgagcgcgccctgcaggatcgatctcttcctgctaaaaccaaaaacac(配列番号37))及びTDH3-XYL2U-R(aactgaaaaagcgtgttttttattcggttgataatttgtatttttgttat(配列番号38))、並びにプライマーXYL2D-F(acatgtttcaaaactgtgattgaacgttatttatg(配列番号39))及びBss-XYL2D-R(atgaccatgattacgccaagcgcgccctgcaggagggataggttccgctcctg(配列番号40))を用いて、それぞれxyl2遺伝子の上流1.0Kbの断片(XYL2U(1.0 kb))並びにxyl2遺伝子の上流1.0Kbの断片(XYL2D(1.0 kb))をPCR増幅した。
K. marxianus DMKU3-1042株は、直鎖状のDNA断片がゲノム上にランダムにインテグレーションされることが知られている(Nonklang, S. et al, 2008. High-temperature ethanol fermentation and transformation with linear DNA in the thermotolerant yeast Kluyveromyces marxianus DMKU3-1042. Appl Environ Microbiol 74:7514-21)。そこで、HIS3dマーカーカセットとXI発現カセットを連結した直鎖状DNAを合成し、K. marxianusのゲノム上にマルチコピーインテグレーションを行うこととした。
KmPIR1プロモーターを用いてXI遺伝子を発現するカセット及びKmCTR1プロモーターを用いてXI遺伝子を発現するカセットを下記の手順で作製した。
K. marxianus DMKU3-1042、RAK6163、KM103、KM203、KM303及びKM306株をL字型試験管に調製したキシロースを炭素源とするSX培地(YNB 6.7g/L、CSM 0.77g/L、xylose 20g/L)5mlに接種し、それぞれ増殖試験を行った。増殖試験は、バイオフォトレコーダーTVS062CA(ADVANTEC, Tokyo, Japan)を用いて30℃、70rpmの条件で行った。増殖試験の結果を図8に示す。
耐熱性酵母であるクリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)について、キシロース資化時の遺伝子発現及びグルコース資化時の遺伝子発現をそれぞれ次世代シークエンス転写解析により解析した。
Claims (11)
- クリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)の染色体におけるPIR1遺伝子の上流に位置し、以下の(a)〜(d)のいずれかの塩基配列からなるプロモーター。
(a)少なくとも、配列番号1に示す塩基配列の3'末端側の1000塩基を含む塩基配列
(b)上記(a)の塩基配列に対して90%以上の一致度を有し、プロモーター活性を有するポリヌクレオチドの塩基配列
(c)少なくとも、配列番号1に示す塩基配列の3'末端側の2000塩基を含む塩基配列
(d)上記(c)の塩基配列に対して90%以上の一致度を有し、プロモーター活性を有するポリヌクレオチドの塩基配列 - クリベロマイセス・マルキシアヌス(Kluyveromyces marxianus)の染色体におけるCTR1遺伝子の上流に位置し、以下の(a)〜(d)のいずれかの塩基配列からなるプロモーター。
(a)少なくとも、配列番号2に示す塩基配列の3'末端側の384塩基を含む塩基配列
(b)上記(a)の塩基配列に対して90%以上の一致度を有し、プロモーター活性を有するポリヌクレオチドの塩基配列
(c)少なくとも、配列番号2に示す塩基配列の3'末端側の429塩基を含む塩基配列
(d)上記(c)の塩基配列に対して90%以上の一致度を有し、プロモーター活性を有するポリヌクレオチドの塩基配列 - 請求項1又は2記載のプロモーターを含む核酸構築物。
- 請求項1又は2記載のプロモーターを含む発現ベクター。
- 上記プロモーターの下流に位置する遺伝子を更に含むことを特徴とする請求項4記載の発現ベクター。
- 請求項1又は2記載のプロモーターを所望の遺伝子の上流に組み入れた形質転換体。
- 上記所望の遺伝子が外来性の遺伝子であることを特徴とする請求項6記載の形質転換体。
- 耐熱性酵母を宿主細胞とすることを特徴とする請求項6記載の形質転換体。
- セルロース系バイオマスを糖化し、且つエタノール発酵能を有することを特徴とする請求項6記載の形質転換体。
- 請求項6乃至9いずれか一項記載の形質転換体を培養し、培養後の培地及び/又は形質転換体内より目的物質を回収する、物質の製造方法。
- 上記目的物質は、セルロース系バイオマスを糖化してなる糖類からエタノール発酵により合成されたエタノールであることを特徴とする請求項10記載の物質の製造方法。
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JP2012046539A JP5878396B2 (ja) | 2012-03-02 | 2012-03-02 | 新規プロモーター及びその利用 |
US14/382,029 US9732338B2 (en) | 2012-03-02 | 2013-03-04 | Promoter and use thereof |
PCT/JP2013/001302 WO2013128948A1 (en) | 2012-03-02 | 2013-03-04 | Novel promoter and use thereof |
BR112014021476A BR112014021476A2 (pt) | 2012-03-02 | 2013-03-04 | promotor e uso do mesmo |
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