JP2017008033A - 抗微生物剤 - Google Patents
抗微生物剤 Download PDFInfo
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- JP2017008033A JP2017008033A JP2016113291A JP2016113291A JP2017008033A JP 2017008033 A JP2017008033 A JP 2017008033A JP 2016113291 A JP2016113291 A JP 2016113291A JP 2016113291 A JP2016113291 A JP 2016113291A JP 2017008033 A JP2017008033 A JP 2017008033A
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- fusion protein
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Abstract
Description
[本発明1001]
グラム陰性細菌の細胞壁を分解する活性を有する酵素、および、該酵素のN末端もしくはC末端、または両方の末端において融合されるペプチドストレッチから構成される融合タンパク質であって、該ペプチドストレッチが、両親媒性ペプチド、スシ(sushi)ペプチド、デフェンシン、疎水性ペプチド、または抗微生物ペプチドである、融合タンパク質。
[本発明1002]
SEQ ID NO: 63〜90記載のアミノ酸配列を呈する、本発明1001の融合タンパク質。
[本発明1003]
N末端に追加的なアミノ酸残基を呈する、本発明1001または1002の融合タンパク質。
[本発明1004]
C末端および/またはN末端にタグまたは追加的なタンパク質を含む、前記本発明のいずれかの融合タンパク質。
[本発明1005]
タグまたは追加的なタンパク質が、1つまたは複数の追加的なアミノ酸残基によって融合タンパク質に連結されている、本発明1004の融合タンパク質。
[本発明1006]
ペプチドストレッチが、1つまたは複数の追加的なアミノ酸残基によって融合タンパク質に連結されている、前記本発明のいずれかの融合タンパク質。
[本発明1007]
酵素が、エンドリシン、オートリシン、またはバクテリオシンである、本発明1001の融合タンパク質。
[本発明1008]
酵素が、SEQ ID NO: 22〜25記載のアミノ酸配列を呈する、本発明1007の融合タンパク質。
[本発明1009]
抗微生物ペプチドが、SEQ ID NO: 6〜16または26〜31記載のアミノ酸配列を呈する、本発明1001の融合タンパク質。
[本発明1010]
スシペプチドが、SEQ ID NO: 32記載のアミノ酸配列を呈する、本発明1001の融合タンパク質。
[本発明1011]
疎水性ペプチドが、SEQ ID NO: 28、33、または35記載のアミノ酸配列を呈する、本発明1001の融合タンパク質。
[本発明1012]
グラム陰性細菌が、
腸内細菌科(Enterobacteriaceae)、
とりわけエシェリキア属(Escherichia)、サルモネラ属(Salmonella)、シゲラ属(Shigella)、シトロバクター属(Citrobacter)、エドワードシエラ属(Edwardsiella)、エンテロバクター属(Enterobacter)、ハフニア属(Hafnia)、クレブシエラ属(Klebsiella)、モルガネラ属(Morganella)、プロテウス属(Proteus)、プロビデンシア属(Providencia)、セラチア属(Serratia)、およびエルシニア属(Yersinia)、
シュードモナス科(Pseudomonadaceae)、
とりわけシュードモナス属(Pseudomonas)、バークホルデリア属(Burkholderia)、ステノトロホモナス属(Stenotrophomonas)、シェワネラ属(Shewanella)、スフィンゴモナス属(Sphingomonas)およびコマモナス属(Comamonas)、
ナイセリア属(Neisseria)、モラクセラ属(Moraxella)、ビブリオ属(Vibrio)、アエロモナス属(Aeromonas)、ブルセラ属(Brucella)、フランシセラ属(Francisella)、ボルデテラ属(Bordetella)、レジオネラ属(Legionella)、バルトネラ属(Bartonella)、コクシエラ属(Coxiella)、ヘモフィルス属(Haemophilus)、パスツレラ属(Pasteurella)、マンヘミア属(Mannheimia)、アクチノバチルス属(Actinobacillus)、ガードネレラ属(Gardnerella)、
スピロヘータ科(Spirochaetaceae)、
とりわけトレポネーマ属(Treponema)およびボレリア属(Borrelia)、
レプトスピラ科(Leptospiraceae)、カンピロバクター属(Campylobacter)、ヘリコバクター属(Helicobacter)、スピリルム属(Spirillum)、ストレプトバチルス属(Streptobacillus)、
バクテロイデス科(Bacteroidaceae)、
とりわけバクテロイデス属(Bacteroides)、フゾバクテリウム属(Fusobacterium)、プレボテラ属(Prevotella)およびポルフィロモナス属(Porphyromonas)、ならびに
アシネトバクター属(Acinetobacter)、
とりわけA. バウマニ(A. baumanii)
からなる群より選択される、前記本発明のいずれかの融合タンパク質。
[本発明1013]
両親媒性ペプチドが、バリン、イソロイシン、ロイシン、メチオニン、フェニルアラニン、トリプトファン、システイン、アラニン、チロシン、ヒスチジン、スレオニン、セリン、プロリン、およびグリシン残基からなる群より選択される少なくとも1つの疎水性アミノ酸残基と組み合わせて、リジン、アルギニン、およびヒスチジン残基からなる群より選択される少なくとも1つの正に荷電したアミノ酸残基を含む、本発明1001の融合タンパク質。
[本発明1014]
両親媒性ペプチドにおけるアミノ酸残基の少なくとも約70%が、アルギニンまたはリジン残基のいずれかであり、かつ該両親媒性ペプチドにおける該アミノ酸残基の少なくとも約30%が、バリン、イソロイシン、ロイシン、メチオニン、フェニルアラニン、トリプトファン、システイン、アラニン、チロシン、ヒスチジン、スレオニン、セリン、プロリン、またはグリシン残基である、本発明1001の融合タンパク質。
[本発明1015]
ペプチドストレッチが、約5〜約100個のアミノ酸残基、とりわけ約5〜50個のアミノ酸残基、とりわけ約5〜30個のアミノ酸残基を含む、前記本発明のいずれかの融合タンパク質。
[本発明1016]
本発明1001〜1015のいずれかの融合タンパク質をコードする、単離された核酸分子。
[本発明1017]
本発明1016の核酸分子を含む、ベクター。
[本発明1018]
本発明1016の核酸分子、または本発明1017のベクターを含む、宿主細胞。
[本発明1019]
細菌細胞または酵母細胞である、本発明1018の宿主細胞。
[本発明1020]
医用薬剤、診断手段、または美容用物質としての使用のための、本発明1001〜1015のいずれかの融合タンパク質。
[本発明1021]
グラム陰性細菌感染症の処置または予防用の医用薬剤としての使用のための、本発明1001〜1015のいずれかの融合タンパク質。
[本発明1022]
殺菌剤としての使用のための、本発明1001〜1015のいずれかの融合タンパク質。
[本発明1023]
食材の、食品加工器具の、食品加工設備の、食材と接触する表面の、医療装置の、病院および手術室における表面の、グラム陰性細菌汚染の処置または予防のための、本発明1001〜1015のいずれかの融合タンパク質の使用。
[本発明1024]
医薬、食品、もしくは飼料における診断手段、または環境診断法としての、本発明1001〜1015のいずれかの融合タンパク質の使用。
[本発明1025]
本発明1001〜1015のいずれかの融合タンパク質を含む、薬学的組成物。
原理の証明として、外膜を通してgp144およびgp188を導く両親媒性ペプチドのLPS破壊活性、ならびに結果として生じるグラム陰性細菌に対する抗細菌活性の可能性を示す。gp144およびgp188は、N末端ペプチドグリカン結合ドメインおよびC末端触媒ドメインを有する、シュードモナス・エルギノーサファージΦKZおよびELに由来するモジュラーエンドリシンである(Briers et al., 2007)。
*大腸菌発現培養液1リットル当たりの、精製された組み換えタンパク質の総収量を示す。この値は、タンパク質濃度の分光光度的測定および精製された保存溶液の総容量によって測定した。高純度を保証するために、gp188誘導体の精製は、gp144誘導体(50mMイミダゾール)と比較して、よりストリンジェントな条件(65 mMイミダゾール)の下で行った。
1.A. 両親媒性ペプチドで改変されたgp144およびgp188の酵素活性
gp144またはgp188の酵素活性に対する改変の影響を評価するため、クロロホルムで透過処理したシュードモナス・エルギノーサ細胞について変異体の比活性を測定し、対応する改変されていないエンドリシンと比較した。対応する飽和曲線を測定するため、様々な徐々に増加する量のすべての改変されたエンドリシンを試験した。この曲線の直線領域の直線回帰の勾配が、比活性についての尺度であり、改変されていないgp144またはgp188の勾配に相対的に表した(表5)。
*異なる変異体の比酵素活性を測定し、同時に試験した対応する元のエンドリシンの比活性(=100%)と相対的に表した。アッセイの緩衝液条件は、対応するエンドリシンの最適条件であった(gp144およびgp188について、それぞれKH2PO4/K2HPO4 I = 120 mM pH 6.2およびI = 80 mM pH 7.3)。
対数期のP.エルギノーサPAO1細胞(約106/ml)を、改変されていないgp144/gp188および改変されたgp144/gp188と共に室温でインキュベーションした。1時間後、細胞懸濁液を希釈してプレーティングした。一晩インキュベーション後、残留コロニーを計数した(表6)。改変されていないgp144 gp188は、陰性対照と比較して細胞数を有意に減少させない。この観察は、障壁としての外膜の効力を例証する。両親媒性α4-ヘリックスを伴う融合タンパク質は、α4-KZ144およびα4-EL188について、それぞれ50±11および34±11%、対数期の細胞を不活性化する。100倍高い密度を有する定常期の細胞を使用する際、これらの値は同様である(それぞれ、35±18および32±17%)。異なる反復実験間の幾分高い変動性にもかかわらず、これらの値は処置されていない細胞とは有意に異なる(α=0.05)。一般に、改変されたgp144誘導体は、gp188誘導体よりも高い抗細菌活性を有する傾向がある。
*対数増殖期のP.エルギノーサPAO1細胞を100×希釈し、10μgの透析していないタンパク質(最終濃度100μg/ml、緩衝液:20 mM NaH2PO4-NaOH pH7.4; 0.5 M NaCl; 0.5 Mイミダゾール)と共に1時間室温でインキュベーションした(最終密度は約106/mlであった)。アリコートを希釈してプレーティングする。抗細菌活性を、相対的不活性化(%)(=100-(Ni/N0) *100、N0=処置されていない細胞の数、およびNi=処置された細胞の数)として、ならびに対数単位(=log10N0/Ni)において表す。すべての試料を6重に反復実験した。平均値/標準偏差を示す。統計解析はスチューデントのt検定を使用して行った。
原理の証明として、外膜を通してgp144およびgp188を導く疎水性ペンタペプチドのLPS破壊活性、ならびに結果として生じるグラム陰性細菌に対する抗細菌活性の可能性を示す。gp144およびgp188は、N末端ペプチドグリカン結合ドメインおよびC末端触媒ドメインを有する、シュードモナス・エルギノーサファージΦKZおよびELに由来するモジュラーエンドリシンである(Briers et al., 2007)。
*大腸菌発現培養液1リットル当たりの、精製された組み換えタンパク質の総収量を示す。この値は、タンパク質濃度の分光光度的測定および精製された保存溶液の総容量によって測定した。高純度を保証するために、gp188誘導体の精製は、gp144誘導体(50mMイミダゾール)と比較して、よりストリンジェントな条件(65 mMイミダゾール)の下で行った。
2.A. 疎水性ペンタペプチドで改変されたgp144およびgp188の酵素活性
gp144またはgp188の酵素活性に対する改変の影響を評価するため、クロロホルムで透過処理したシュードモナス・エルギノーサ細胞について変異体の比活性を測定し、対応する改変されていないエンドリシンと比較した。対応する飽和曲線を測定するため、様々な徐々に増加する量のすべての改変されたエンドリシンを試験した。この曲線の直線領域の直線回帰の勾配が、比活性についての尺度であり、改変されていないgp144またはgp188の勾配に相対的に表した(表8)。
*異なる変異体の比酵素活性を測定し、同時に試験した対応する元のエンドリシンの比活性(=100%)と相対的に表した。アッセイの緩衝液条件は、対応するエンドリシンの最適条件であった(gp144およびgp188について、それぞれKH2PO4/K2HPO4 I = 120 mM pH 6.2およびI = 80 mM pH 7.3)。
対数期のP.エルギノーサPAO1細胞(約106/ml)を、改変されていないgp144/gp188および改変されたgp144/gp188と共に室温でインキュベーションした。1時間後、細胞懸濁液を希釈してプレーティングした。一晩インキュベーション後、残留コロニーを計数した(表9)。改変されていないgp144 gp188は、陰性対照と比較して細胞数を有意に減少させない。この観察は、障壁としての外膜の効力を例証する。疎水性ペンタペプチド融合タンパク質とのインキュベーションは、細菌細胞数の有意な減少(α=0.05)を引き起こす(改変されたgp144およびgp188について、それぞれ83±7および69±21%)。一般に、改変されたgp144誘導体は、gp188誘導体よりも高い抗細菌活性を有する傾向がある。
*対数増殖期のP.エルギノーサPAO1細胞を100×希釈し、10μgの透析していないタンパク質(最終濃度100μg/ml、緩衝液:20 mM NaH2PO4-NaOH pH7.4; 0.5 M NaCl; 0.5 Mイミダゾール)と共に1時間室温でインキュベーションした(最終密度は約106/mlであった)。アリコートを希釈してプレーティングする。抗細菌活性を、相対的不活性化(%)(=100-(Ni/N0) *100、N0=処置されていない細胞の数、およびNi=処置された細胞の数)として、ならびに対数単位(=log10N0/Ni)において表す。すべての試料を6重に反復実験した。平均値/標準偏差を示す。統計解析はスチューデントのt検定を使用して行った。
SEQ ID NO: 25記載のKZ144は、N末端ペプチドグリカン結合ドメインおよびC末端触媒ドメインを有する、シュードモナス・エルギノーサのファージΦKZに由来するモジュラーエンドリシンである(Briers et al., 2007)。エンドリシンKZ144は、SEQ ID NO: 64記載の核酸分子によってコードされる。SEQ ID NO: 64記載の核酸分子を、核酸分子の5'端にBamH I (5'-GGA TCC-3')制限部位を、および核酸分子の3'端にXho I (5'-CTC GAG-3')制限部位を伴って合成的に産生した。
1.3〜5 ml/分の流速での、10カラム容量までの洗浄緩衝液(20 mMイミダゾール、1 M NaCl、および20 mM Hepes、pH7.4)でのHistrap FF 5 mlカラム(GE Healthcare)の平衡化。
2.3〜5 ml/分の流速での、Histrap FF 5 mlカラムへの全溶解物(求められる融合タンパク質を含む)のローディング。
3.3〜5 ml/分の流速での、結合していない試料を除去するための10カラム容量までの洗浄緩衝液でのカラムの洗浄、続いて10%溶出緩衝液(500 mMイミダゾール、0.5 M NaCl、および20 mM Hepes、pH7.4)での第2の洗浄段階。
4.3〜5 ml/分の流速での、4カラム容量の溶出緩衝液(500 mMイミダゾール、0.5 M NaCl、および20 mM Hepes、pH7.4)の100%への直線勾配での、結合した融合タンパク質のカラムからの溶出。
KZ144およびペプチドストレッチα4ヘリックスからなる融合タンパク質を、実施例1において記載したように構築した。KZ144およびそれぞれのペプチドストレッチからなる他の融合タンパク質を、実施例3において記載したように構築した。
略語:±<1 log;+:1 log;++:2〜3 log;+++:4またはそれ以上のlog;n.d.は、この株をそれぞれの融合タンパク質で試験しなかったことを意味する。
STM0016およびペプチドストレッチザルコトキシンIAまたはSMAP-29からなる融合タンパク質を、実施例3において記載したように構築した。
N4gp61およびペプチドストレッチSMAP-29からなる融合タンパク質を、実施例3において記載したように構築した。
エンドリシンgp188およびペプチドストレッチα4ヘリックス、SMAP-29、またはザルコトキシンIAからなる融合タンパク質を、実施例1において記載したように構築した。大腸菌DSMZ 11753、アシネトバクター・バウマニDSMZ 30007、およびシュードモナス・エルギノーサPAO1p細胞(熱傷創傷単離株、Queen Astrid Hospital, Brussels; Pirnay JP et al. (2003), J Clin Microbiol., 41(3):1192-1202)を、試験株として使用した。エンドリシンgp188およびそれぞれのペプチドストレッチからなる融合タンパク質の抗微生物活性を、実施例4において記載したように検討した。これらの融合タンパク質の抗微生物活性を以下の表に示す。
SEQ ID NO: 3記載のアミノ酸配列を有するサルモネラ属エンドリシンおよびペプチドストレッチSMAP-29からなる融合タンパク質を、実施例3と同様に構築した。大腸菌DSMZ 11753およびサルモネラ・チフィムリウムDSMZ 17058を、試験株として使用した。融合タンパク質の抗微生物活性を、実施例4において記載したように検討した。この融合タンパク質の抗微生物活性を以下の表に示す。
SEQ ID NO: 5記載のアミノ酸配列を有するアシネトバクター・バウマニ エンドリシン、ならびにペプチドストレッチSMAP-29、シュージン1、およびスシ1からなる融合タンパク質を、実施例3と同様に構築した。アシネトバクター・バウマニDSMZ 30007およびシュードモナス・エルギノーサPAO1p細胞(熱傷創傷単離株、Queen Astrid Hospital, Brussels; Pirnay JP et al. (2003), J Clin Microbiol., 41(3):1192-1202)を、試験株として使用した。融合タンパク質の抗微生物活性を、実施例4において記載したように検討した。これらの融合タンパク質の抗微生物活性を以下の表に示す。
Claims (25)
- グラム陰性細菌の細胞壁を分解する活性を有する酵素、および、該酵素のN末端もしくはC末端、または両方の末端において融合されるペプチドストレッチから構成される融合タンパク質であって、該ペプチドストレッチが、両親媒性ペプチド、スシ(sushi)ペプチド、デフェンシン、疎水性ペプチド、または抗微生物ペプチドである、融合タンパク質。
- SEQ ID NO: 63〜90記載のアミノ酸配列を呈する、請求項1記載の融合タンパク質。
- N末端に追加的なアミノ酸残基を呈する、請求項1または2記載の融合タンパク質。
- C末端および/またはN末端にタグまたは追加的なタンパク質を含む、前記請求項のいずれか一項記載の融合タンパク質。
- タグまたは追加的なタンパク質が、1つまたは複数の追加的なアミノ酸残基によって融合タンパク質に連結されている、請求項4記載の融合タンパク質。
- ペプチドストレッチが、1つまたは複数の追加的なアミノ酸残基によって融合タンパク質に連結されている、前記請求項のいずれか一項記載の融合タンパク質。
- 酵素が、エンドリシン、オートリシン、またはバクテリオシンである、請求項1記載の融合タンパク質。
- 酵素が、SEQ ID NO: 22〜25記載のアミノ酸配列を呈する、請求項7記載の融合タンパク質。
- 抗微生物ペプチドが、SEQ ID NO: 6〜16または26〜31記載のアミノ酸配列を呈する、請求項1記載の融合タンパク質。
- スシペプチドが、SEQ ID NO: 32記載のアミノ酸配列を呈する、請求項1記載の融合タンパク質。
- 疎水性ペプチドが、SEQ ID NO: 28、33、または35記載のアミノ酸配列を呈する、請求項1記載の融合タンパク質。
- グラム陰性細菌が、
腸内細菌科(Enterobacteriaceae)、
とりわけエシェリキア属(Escherichia)、サルモネラ属(Salmonella)、シゲラ属(Shigella)、シトロバクター属(Citrobacter)、エドワードシエラ属(Edwardsiella)、エンテロバクター属(Enterobacter)、ハフニア属(Hafnia)、クレブシエラ属(Klebsiella)、モルガネラ属(Morganella)、プロテウス属(Proteus)、プロビデンシア属(Providencia)、セラチア属(Serratia)、およびエルシニア属(Yersinia)、
シュードモナス科(Pseudomonadaceae)、
とりわけシュードモナス属(Pseudomonas)、バークホルデリア属(Burkholderia)、ステノトロホモナス属(Stenotrophomonas)、シェワネラ属(Shewanella)、スフィンゴモナス属(Sphingomonas)およびコマモナス属(Comamonas)、
ナイセリア属(Neisseria)、モラクセラ属(Moraxella)、ビブリオ属(Vibrio)、アエロモナス属(Aeromonas)、ブルセラ属(Brucella)、フランシセラ属(Francisella)、ボルデテラ属(Bordetella)、レジオネラ属(Legionella)、バルトネラ属(Bartonella)、コクシエラ属(Coxiella)、ヘモフィルス属(Haemophilus)、パスツレラ属(Pasteurella)、マンヘミア属(Mannheimia)、アクチノバチルス属(Actinobacillus)、ガードネレラ属(Gardnerella)、
スピロヘータ科(Spirochaetaceae)、
とりわけトレポネーマ属(Treponema)およびボレリア属(Borrelia)、
レプトスピラ科(Leptospiraceae)、カンピロバクター属(Campylobacter)、ヘリコバクター属(Helicobacter)、スピリルム属(Spirillum)、ストレプトバチルス属(Streptobacillus)、
バクテロイデス科(Bacteroidaceae)、
とりわけバクテロイデス属(Bacteroides)、フゾバクテリウム属(Fusobacterium)、プレボテラ属(Prevotella)およびポルフィロモナス属(Porphyromonas)、ならびに
アシネトバクター属(Acinetobacter)、
とりわけA. バウマニ(A. baumanii)
からなる群より選択される、前記請求項のいずれか一項記載の融合タンパク質。 - 両親媒性ペプチドが、バリン、イソロイシン、ロイシン、メチオニン、フェニルアラニン、トリプトファン、システイン、アラニン、チロシン、ヒスチジン、スレオニン、セリン、プロリン、およびグリシン残基からなる群より選択される少なくとも1つの疎水性アミノ酸残基と組み合わせて、リジン、アルギニン、およびヒスチジン残基からなる群より選択される少なくとも1つの正に荷電したアミノ酸残基を含む、請求項1記載の融合タンパク質。
- 両親媒性ペプチドにおけるアミノ酸残基の少なくとも約70%が、アルギニンまたはリジン残基のいずれかであり、かつ該両親媒性ペプチドにおける該アミノ酸残基の少なくとも約30%が、バリン、イソロイシン、ロイシン、メチオニン、フェニルアラニン、トリプトファン、システイン、アラニン、チロシン、ヒスチジン、スレオニン、セリン、プロリン、またはグリシン残基である、請求項1記載の融合タンパク質。
- ペプチドストレッチが、約5〜約100個のアミノ酸残基、とりわけ約5〜50個のアミノ酸残基、とりわけ約5〜30個のアミノ酸残基を含む、前記請求項のいずれか一項記載の融合タンパク質。
- 請求項1〜15のいずれか一項記載の融合タンパク質をコードする、単離された核酸分子。
- 請求項16記載の核酸分子を含む、ベクター。
- 請求項16記載の核酸分子、または請求項17記載のベクターを含む、宿主細胞。
- 細菌細胞または酵母細胞である、請求項18記載の宿主細胞。
- 医用薬剤、診断手段、または美容用物質としての使用のための、請求項1〜15のいずれか一項記載の融合タンパク質。
- グラム陰性細菌感染症の処置または予防用の医用薬剤としての使用のための、請求項1〜15のいずれか一項記載の融合タンパク質。
- 殺菌剤としての使用のための、請求項1〜15のいずれか一項記載の融合タンパク質。
- 食材の、食品加工器具の、食品加工設備の、食材と接触する表面の、医療装置の、病院および手術室における表面の、グラム陰性細菌汚染の処置または予防のための、請求項1〜15のいずれか一項記載の融合タンパク質の使用。
- 医薬、食品、もしくは飼料における診断手段、または環境診断法としての、請求項1〜15のいずれか一項記載の融合タンパク質の使用。
- 請求項1〜15のいずれか一項記載の融合タンパク質を含む、薬学的組成物。
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