JP2014508533A - アルデヒドおよび対応するアルコールの微生物合成 - Google Patents
アルデヒドおよび対応するアルコールの微生物合成 Download PDFInfo
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- JP2014508533A JP2014508533A JP2013558129A JP2013558129A JP2014508533A JP 2014508533 A JP2014508533 A JP 2014508533A JP 2013558129 A JP2013558129 A JP 2013558129A JP 2013558129 A JP2013558129 A JP 2013558129A JP 2014508533 A JP2014508533 A JP 2014508533A
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Abstract
Description
Claims (20)
- アルコールを製造する方法であって、
発酵培地中で複数の微生物細胞を増殖する工程であって、前記細胞は非遺伝子改変細胞と比較して増加した代謝活性を有するように遺伝子改変され、
前記代謝活性の増加は、ピルビン酸もしくは2−ケト酪酸からアルデヒドへの変換の増加を特徴とし、
前記複数の微生物細胞がアルコールデヒドロゲナーゼ活性の減少を有するようにさらに遺伝子改変される工程、
前記アルデヒドを前記発酵培地から気相内へ連続的もしくは半連続的に移動させる工程、
前記アルデヒドを前記気相から凝縮させる工程、および
前記凝縮させたアルデヒドを対応するアルコールに還元させる工程を含む方法。 - 前記微生物細胞は、組み換えピルビン酸デカルボキシラーゼの発現によるピルビン酸からアセトアルデヒドへの変換における増加した代謝活性を有する請求項1に記載の方法。
- 前記微生物細胞は、組み換え2−ケトイソ吉草酸デカルボキシラーゼの発現による2−ケト酪酸からプロパナールへの変換における増加した代謝活性を有する請求項1に記載の方法。
- 前記微生物細胞は、組み換え2−ケトイソ吉草酸デカルボキシラーゼの発現による2−ケト吉草酸、2−ケトカプロン酸、2−ケトヘプタン酸、2−ケトオクタノン酸、2−ケト−3−メチル吉草酸、2−ケト−4−メチルカプロン酸、2−ケト−5−メチルヘプタン酸、2−ケト−6−メチルオクタノン酸、2−ケト−イソ吉草酸、2−ケトイソカプロン酸、2−ケト−5−メチルヘキサン酸、及び2−ケト−6−メチルオクタノン酸の内の1つ以上の脱カルボキシル化における増加した代謝活性を有する請求項1に記載の方法。
- 前記微生物細胞は、組み換えilvGMCD遺伝子の発現もしくは組み換えilvBNCD遺伝子の発現による2−ケト酪酸から2−ケト−3−メチル吉草酸への分岐炭素鎖延長における増加した代謝活性を有する請求項1に記載の方法。
- 前記微生物細胞は、組み換えals−ilvGMCD遺伝子の発現もしくは組み換えilvIHCD遺伝子の発現によるピルビン酸から2−ケト−イソ吉草酸への分岐炭素鎖延長における増加した代謝活性を有する、請求項1に記載の方法。
- 前記微生物細胞は、組み換えleuABCD遺伝子の発現による直鎖炭素鎖延長における増加した代謝活性を有する請求項4、5、又は6のいずれか一項に記載の方法。
- 前記微生物細胞中の前記アルコールデヒドロゲナーゼ活性の減少は、前記非遺伝子改変細胞と比較して少なくとも70%減少する請求項1に記載の方法。
- 前記微生物細胞中の前記アルコールデヒドロゲナーゼ活性の減少は、前記非遺伝子改変細胞と比較して少なくとも90%減少する請求項1に記載の方法。
- 前記アルデヒドを前記気相内に移動させる工程は、前記発酵培地の撹拌、不活性ガスを用いた前記発酵培地の剥ぎ取り、酸素含有ガスを用いた前記発酵培地の剥ぎ取り、および前記アルデヒドの結合剤への一時的結合から成る群から選択される工程を含む請求項1に記載の方法。
- 前記アルデヒドを移動させる工程は、連続的に実施される請求項1に記載の方法。
- 前記アルデヒドは、アセトアルデヒド、プロパナール、ブタナール、および2−メチル−1−プロパナールから成る群から選択される請求項1に記載の方法。
- 前記凝縮させたアルデヒドを前記対応するアルコールに還元する工程は、電気化学的還元、酵素的還元、および水素を用いた触媒による還元の群から選択される請求項1に記載の方法。
- 前記微生物細胞は、エシェリキア(Escherichia)、バシラス(Bacillus)、コリネバクテリウム(Corynebacterium)、ラルストニア(Ralstonia)、ザイモモナス(Zymomonas)、クロストリジウム(Clostridium)、ラクトバシラス(Lactobacillus)、シネココッカス(Synechococcus)、シネコシスティス(Synechocystis)、サッカロミセス(Saccharomyces)、ピチア(Pichia)、カンジダ(Candida)、ハンセヌラ(Hansenula)、およびアスペルギルス(Aspergillus)から成る群から選択される属に属する請求項1に記載の方法。
- 前記微生物細胞には、大腸菌(Escherichia coli)、枯草菌(Bacillus subtilis)、シネココッカス・エロンガタス(Synechococcus elongatus)、ラルストニア・ユートロファ(Ralstonia eutropha)、およびサッカロミセス・セレビジエ(Saccharomyces cerevisiae)から成る群から選択される種に属する請求項14に記載の方法。
- 前記発酵培地は、グルコース、フルクトース、スクロース、デンプン、セルロース、ヘミセルロース、グリセロール、二酸化炭素、タンパク質、およびアミノ酸から成る群から選択される炭素源を有する請求項1に記載の方法。
- 価値生産物がアルデヒドからex vivoで生成されるプロセスにおいて使用するための代謝制御微生物細胞を製造する方法であって、
ピルビン酸もしくは2−ケト酪酸からアルデヒドへの増加した変換を有するように前記微生物を遺伝子改変する工程、
前記微生物細胞が実質的にアルコール生成を行わないように減少したアルコールデヒドロゲナーゼ活性を有するように前記微生物細胞を遺伝子改変する工程、および
それにより前記アルデヒドから前記価値生産物へのex vivo変換を可能にするよう揮発性アルデヒドを発酵培地から剥ぎ取ることができる十分な量で前記発酵培地中での前記揮発性アルデヒドの生成について前記組み換え微生物細胞を試験する工程を含む方法。 - 前記微生物細胞は、組み換えピルビン酸デカルボキシラーゼの発現によるピルビン酸からアセトアルデヒドへの変換における増加した代謝活性、または組み換え2−ケトイソ吉草酸デカルボキシラーゼの発現による2−ケト酪酸からプロパナールへの変換における増加した代謝活性を有する請求項17に記載の方法。
- 前記微生物細胞は、組み換えleuABCD遺伝子の発現による直鎖炭素鎖延長における増加した代謝活性を有する請求項17に記載の方法。
- 前記微生物細胞は、組み換えilvGMCD遺伝子の発現もしくは組み換えilvBNCD遺伝子の発現による2−ケト酪酸から2−ケト−3−メチル吉草酸への分岐炭素鎖延長における増加した代謝活性、又は組み換えalsS−ilvCD遺伝子の発現もしくは組み換えilvIHCD遺伝子の発現によるピルビン酸から2−ケト−イソ吉草酸への分岐炭素鎖延長における増加した代謝活性を有する請求項17に記載の方法。
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