JP6585602B2 - タンパク質発現の増大 - Google Patents
タンパク質発現の増大 Download PDFInfo
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- JP6585602B2 JP6585602B2 JP2016544103A JP2016544103A JP6585602B2 JP 6585602 B2 JP6585602 B2 JP 6585602B2 JP 2016544103 A JP2016544103 A JP 2016544103A JP 2016544103 A JP2016544103 A JP 2016544103A JP 6585602 B2 JP6585602 B2 JP 6585602B2
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Description
本出願は、2013年12月31日に出願され、その内容の全体が参照により本明細書に援用されている、米国仮特許出願第USSN 61/922,613号の優先権の特典を主張する。
本発明は、全般的に、目的のタンパク質の発現の増加をもたらす遺伝子改変を起こす細菌細胞と、かかる細胞の作製方法及び使用方法と、に関する。本発明の態様として、ykfオペロンによってコードされるタンパク質の活性を変化させ、かつ目的のタンパク質の発現の増大をもたらす遺伝子改変を起こすバチルス種(Bacillus species)などのグラム陽性微生物が挙げられる。
前記変異体配列は、
少なくとも15ヌクレオチドの長さであり、
配列番号1の全て又は一部と少なくとも60%同一であり、
ykfA遺伝子内のヌクレオチド位置での少なくとも1つの遺伝子改変を含み、ここで、該遺伝子変化は、前記少なくとも1つの変異がグラム陽性菌細胞の内因性ykfA遺伝子内に存在する場合、YkfAタンパク質の活性の変化を引き起こす。
前記変異体配列は、
少なくとも5アミノ酸の長さであり、
配列番号2の全て又は一部と少なくとも60%同一であり、
YkfAポリペプチド配列遺伝子内のアミノ酸における少なくとも1つの改変を含み、ここで、該改変は、YkfAタンパク質の活性の変化を引き起こす。
a)上記ベクターで親グラム陽性菌細胞を形質転換させる工程と、
b)改変グラム陽性菌細胞を作製するために、前記ベクターと、前記親グラム陽性菌細胞のykfオペロンにおける対応する領域とを相同組換えさせる工程と、
c)前記目的のタンパク質の発現に好適な条件下で前記改変グラム陽性菌細胞を増殖させる工程であって、該改変グラム陽性菌細胞における前記目的のタンパク質の産生は、前記形質転換工程前の前記グラム陽性菌細胞と比較して増加する、工程と、を含む。
本明細書で使用されるとき、「宿主細胞」は、新たに導入されたDNA配列のための宿主又は発現ビヒクルとして作用する能力を有する細胞を指す。
以下の実施例は、例示目的で提供され、特定の実施形態及び本発明の態様を更に示すものであり、それらの範囲を制限するよう解釈されるものではない。
バチルス種におけるタンパク質発現に対するykfA遺伝子の変異の効果
枯草菌のykfA遺伝子は、ペプチドグリカンの再利用に関与しているykfオペロンの第1のコード配列(図1)である。YfkAは、細菌ペプチドグリカンにおいて自然に発生するL−アミノ酸とD−アミノ酸とのアミド結合を切断するLD−カルボキシペプチダーゼである。
バチルス種における緑色蛍光タンパク質発現に対するykfA変異の効果
他のタンパク質の発現に対するykfA変異の効果を試験するために、PaprE−GFP catR構築物をCB15−14及びCB15−14ykfA変異株のaprEローカスに導入し、5μg/mLのクロラムフェニコールを含むルリア寒天プレート上で形質転換体を選択した。ykfA変異株及び野生型株を5mLのルリアブロスで一晩増殖させた。緑色蛍光タンパク質(GFP)の発現を試験するために、1mLの前培養を使用して、25mLのNB培地(2倍)(栄養ブロス(2倍)、SNB塩(1倍))を、振盪フラスコ中で、37℃、250rpmで植え付けた。20倍に希釈されたブロス全体の細胞密度を、SpectraMax分光光度計(Molecular Devices製(Downington,PA,USA))を使用して、1時間おきに、600nmで測定した。600nmでの吸光度を時間の関数としてプロットし、その結果を図3Aに示す。定常期(NB(2倍)での増殖の4時間目と6時間目との間)に突入する際、ykfA変異株における細胞の増殖の低下は、ykfA変異により、向上した細胞の生存性を示す制御株と比較して遅延する。
バチルス種におけるβ−D−グルコシダーゼ発現に対するykfA変異の効果
β−D−グルコシダーゼの発現に対するykfA変異の効果を試験するために、PaprE−BglC catR構築物をCB15−14及びCB15−14ykfA変異株のaprEローカスに導入し、5μg/mLのクロラムフェニコールを含むルリア寒天プレート上で形質転換体を選択した。ykfA変異株及び野生型株を5mLのルリアブロスで一晩増殖させた。分泌されたβ−D−グルコシダーゼの発現を試験するために、1mLの前培養を使用して、25mLのNB培地(2倍)(栄養ブロス(2倍)、SNB塩(1倍))を、振盪フラスコ中で、37℃、250rpmで植え付けた。20倍に希釈されたブロス全体の細胞密度を、SpectraMax分光光度計(Molecular Devices製(Downington,PA,USA))を使用して、1時間おきに、600nmで測定した。600nmでの吸光度を時間の関数としてプロットし、その結果を図4Aに示す。ykfA変異を持つ細胞は、より高い細胞増殖性を有しており、ykfA変異の存在による向上した細胞の生存性を示している。
配列番号1−ykfA野生型ヌクレオチド配列
atgaaaggagtgttttcgttgaattacaagccgaaagcgttgaacaagggtgatacagtcggagtgatcgcgcccgcaagtccgccggatccaaaaaagcttgacaccgcgcttttatttttagaagagctcggtcttcaggtgaagttgggcaaggcgctgaaaaaccagcacggctatttagcgggacaggatgatgagcggctggcggatctccatgagatgttcagagacgatgaggtaaaagcagtgttgtgcgcatgcgggggttttgggacaggacgtatcgccgcgggcattgatttcagcttgatccgcaaacaccctaaaatcttttggggatacagcgatattacgtttttacatactgccattcatcaaaacacaggtcttgtcactttccatggcccgatgctcagcacggatattggccttgacgacgttcacccgctgacaaaagcgtcatataagcagctcttccaggagacggaattcacctatacagaagagctttctccgctgaccgagcttgttcctggaaaagcggaaggcgagcttgtcgggggaaatctgtctttgctgacgtctacactgggcacgccatttgaaattgatacgagaggaaagcttctgtttattgaagatattgacgaggagccttatcaaatcgaccggatgctgaatcagctgaaaatgggggggaagctgacggacgcggcgggaattctagtttgtgattttcacaattgtgtcccggtgaagcgagagaagtctctctcgcttgagcaggtgctggaagactatattatttctgcgggcaggcctgctctgagaggatttaaaatcggccactgctcgccaagtattgccgttccgatcggtgcgaaagctgctatgaatacagcagaaaaaacagccgtaatagaggcgggcgtttcagaaggggcgctgaagacatga
MKGVFSLNYKPKALNKGDTVGVIAPASPPDPKKLDTALLFLEELGLQVKLGKALKNQHGYLAGQDDERLADLHEMFRDDEVKAVLCACGGFGTGRIAAGIDFSLIRKHPKIFWGYSDITFLHTAIHQNTGLVTFHGPMLSTDIGLDDVHPLTKASYKQLFQETEFTYTEELSPLTELVPGKAEGELVGGNLSLLTSTLGTPFEIDTRGKLLFIEDIDEEPYQIDRMLNQLKMGGKLTDAAGILVCDFHNCVPVKREKSLSLEQVLEDYIISAGRPALRGFKIGHCSPSIAVPIGAKAAMNTAEKTAVIEAGVSEGALKT
atgaaaggagtgttttcgttgaattacaagccgaaagcgttgaacaagggtgatacagtcggagtgatcgcgcccgcaagtccgccggatccaaaaaagcttgacaccgcgcttttatttttagaagagctcggtcttcaggtgaagttgggcaaggcgctgaaaaaccagcacggctatttagcgggacaggatgatgagcggctggcggatctccatgagatgttcagagacgatgaggtaaaagcagtgttgtgcgcatgcgggggttttgggacaggacgtatcgccgcgggcattgatttcagcttgatccgcaaacaccctaaaatcttttggggatacagcgatattacgtttttacatactgccattcatcaaaacacaggtcttgtcactttccatggcccgatgctcagcacggatattggccttgacgacgttcacccgctgacaaaagcgtcatataagcagctcttccaggagacggaattcacctatacagaagagctttctccgctgaccgagcttgttcctggaaaagcggaaggcgagcttgtcgggggaaatctgtctttgctgacgtctacactgggcacgccatttgaaattgatacgagaggaaagcttctgtttattgaagatattgacgaggagccttatcaaatcgaccggatgctgaatcagctgaaaatgggggggaagctgacggacgcggcgggaattctagtttgtgattttcacaattgtgtcctgctcaagcgagagaagtctctctcgcttgagcaggtgctggaagactatattatttctgcgggcaggcctgctctgagaggatttaaaatcggccactgctcgccaagtattgccgttccgatcggtgcgaaagctgctatgaatacagcagaaaaaacagccgtaatagaggcgggcgtttcagaaggggcgctgaagacatga
MKGVFSLNYKPKALNKGDTVGVIAPASPPDPKKLDTALLFLEELGLQVKLGKALKNQHGYLAGQDDERLADLHEMFRDDEVKAVLCACGGFGTGRIAAGIDFSLIRKHPKIFWGYSDITFLHTAIHQNTGLVTFHGPMLSTDIGLDDVHPLTKASYKQLFQETEFTYTEELSPLTELVPGKAEGELVGGNLSLLTSTLGTPFEIDTRGKLLFIEDIDEEPYQIDRMLNQLKMGGKLTDAAGILVCDFHNCVLLKREKSLSLEQVLEDYIISAGRPALRGFKIGHCSPSIAVPIGAKAAMNTAEKTAVIEAGVSEGALKT
A Q S V P Y G V S Q I K A P A L H S Q G Y T G S N V K V A V I D S G I D S S H P D L K V A G G A S M V P S E T N P F Q D N N S H G T H V A G T V A A L N N S I G V L G V A P S A S L Y A V K V L G A D G S G Q Y S W I I N G I E W A I A N N M D V I N M S L G G P S G S A A L K A A V D K A V A S G V V V V A A A G N E G T S G S S S T V G Y P G K Y P S V I A V G A V D S S N Q R A S F S S V G P E L D V M A P G V S I Q S T L P G N K Y G A L N G T S M A S P H V A G A A A L I L S K H P N W T N T Q V R S S L E N T T T K L G D S F Y Y G K G L I N V Q A A A Q
V N R N V L K N T G L K E I M S A K A S V E G I V N N H V F S M E G F G K G N V L F G N Q L M Q I R V T K G G P L P F A F D I V S I A F Q Y G N R T F T K Y P D D I A D Y F V Q S F P A G F F Y E R N L R F E D G A I V D I R S D I S L E D D K F H Y K V E Y R G N G F P S N G P V M Q K A I L G M E P S F E V V Y M N S G V L V G E V D L V Y K L E S G N Y Y S C H M K T F Y R S K G G V K E F P E Y H F I H H R L E K T Y V E E G S F V E Q H E T A I A Q L T T I G K P L G S L H E W V
A A G T K T P V A K N G Q L S I K G T Q L V N R D G K A V Q L K G I S S H G L Q W Y G E Y V N K D S L K W L R D D W G I T V F R A A M Y T A D G G Y I D N P S V K N K V K E A V E A A K E L G I Y V I I D W H I L N D G N P N Q N K E K A K E F F K E M S S L Y G N T P N V I Y E I A N E P N G D V N W K R D I K P Y A E E V I S V I R K N D P D N I I I V G T G T W S Q D V N D A A D D Q L K D A N V M Y A L H F Y A G T H G Q F L R D K A N Y A L S K G A P I F V T E W G T S D A S G N G G V F L D Q S R E W L K Y L D S K T I S W V N W N L S D K Q E S S S A L K P G A S K T G G W R L S D L S A S G T F V R E N I L G T K D S T K D I P E T P S K D K P T Q E N G I S V Q Y R A G D G S M N S N Q I R P Q L Q I K N N G N T T V D L K D V T A R Y W Y K A K N K G Q N F D C D Y A Q I G C G N V T H K F V T L H K P K Q G A D T Y L E L G F K N G T L A P G A S T G N I Q L R L H N D D W S N Y A Q S G D Y S F F K S N T F K T T K K I T L Y D Q G K L I W G T E P N
Claims (18)
- グラム陽性菌細胞からの目的のタンパク質の発現を増加させる方法であって、
a)目的のタンパク質を産生可能な改変グラム陽性菌細胞を得る工程であって、前記改変グラム陽性菌細胞は、ykfオペロンのykfA遺伝子における少なくとも1つの遺伝子改変を含む、工程と、
b)前記改変グラム陽性菌細胞によって前記目的のタンパク質が発現するような条件下で前記改変グラム陽性菌細胞を培養する工程であって、前記改変グラム陽性菌細胞における前記目的のタンパク質の発現は、本質的に同一の培養条件下で増殖させた対応する非改変グラム陽性菌細胞における前記目的のタンパク質の発現と比較して増加する、工程と、を含み、
前記遺伝子改変は、配列番号2の、アミノ酸252に対応する位置のアミノ酸におけるPからLへの改変及びアミノ酸253に対応する位置のアミノ酸におけるVからLへの改変をもたらす、方法。 - 前記改変グラム陽性菌細胞は、バチルス種(Bacillus sp.)株である、請求項1に記載の方法。
- 前記改変グラム陽性菌細胞は、本質的に同一の培養条件下で増殖させた対応する非改変グラム陽性菌細胞におけるYkfAタンパク質の活性と比較して、活性が変化したYkfAタンパク質を有し、ここで、前記活性の変化は、活性の増加又は減少であり得る、請求項1に記載の方法。
- 前記ykfA遺伝子は、配列番号1と少なくとも90%同一である、請求項1に記載の方法。
- 前記目的のタンパク質は、酵素である、請求項1に記載の方法。
- 前記目的のタンパク質は、プロテアーゼである、請求項1に記載の方法。
- 前記目的のタンパク質を回収する工程を更に含む、請求項1に記載の方法。
- 改変グラム陽性菌細胞であって、前記改変グラム陽性菌細胞は、本質的に同一の培養条件下で増殖させた対応する非改変グラム陽性菌細胞と比較して、ykfオペロンのykfA遺伝子における少なくとも1つの遺伝子改変を含み、前記遺伝子改変は、配列番号2の、アミノ酸252に対応する位置のアミノ酸におけるPからLへの改変及びアミノ酸253に対応する位置のアミノ酸におけるVからLへの改変をもたらす、改変グラム陽性菌細胞。
- 前記改変グラム陽性菌細胞は、バチルス種株である、請求項8に記載の改変細胞。
- 前記改変グラム陽性菌細胞は、本質的に同一の培養条件下で増殖させた対応する非改変グラム陽性菌細胞におけるYkfAタンパク質の活性と比較して、活性が変化したYkfAタンパク質を有し、ここで、前記活性の変化は、活性の増加又は減少であり得る、請求項8に記載の改変細胞。
- 前記ykfA遺伝子は、配列番号1と少なくとも90%同一である、請求項8に記載の改変細胞。
- 前記改変細胞は、目的のタンパク質を発現する、請求項8に記載の改変細胞。
- 前記目的のタンパク質は、酵素である、請求項12に記載の改変細胞。
- 前記目的のタンパク質は、プロテアーゼである、請求項12に記載の改変細胞。
- ykfA遺伝子由来の変異体配列を含むポリヌクレオチドであって、
前記変異体配列は、
少なくとも15ヌクレオチドの長さであり、
配列番号1と少なくとも90%同一であり、
少なくとも1つの遺伝子改変を含み、ここで、該遺伝子変化は、配列番号2の、アミノ酸252に対応する位置のアミノ酸におけるPからLへの改変及びアミノ酸253に対応する位置のアミノ酸におけるVからLへの改変をもたらす、ポリヌクレオチド。 - 請求項15に記載のポリヌクレオチド配列を含むベクター。
- 前記ベクターは、グラム陽性菌細胞への形質転換の際、相同組換えによって、前記ポリヌクレオチド配列における前記少なくとも1つの変異を前記グラム陽性菌細胞のykfオペロンにおける対応する位置に導入するように設計された標的化ベクターである、請求項16に記載のベクター。
- グラム陽性菌細胞における目的のタンパク質の発現を増大させる方法であって、
a)請求項16に記載のベクターで親グラム陽性菌細胞を形質転換させる工程と、
b)改変グラム陽性菌細胞を作製するために、前記ベクターと、前記親グラム陽性菌細胞のykfオペロンにおける対応する領域とを相同組換えさせる工程と、
c)前記目的のタンパク質の発現に好適な条件下で前記改変グラム陽性菌細胞を増殖させる工程であって、該改変グラム陽性菌細胞における前記目的のタンパク質の産生は、前記形質転換工程前の前記グラム陽性菌細胞と比較して増加する工程と、
を含む方法。
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WO2015102814A1 (en) | 2015-07-09 |
CA2935066C (en) | 2022-06-21 |
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