JP5735665B2 - Npp1融合タンパク質 - Google Patents
Npp1融合タンパク質 Download PDFInfo
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- JP5735665B2 JP5735665B2 JP2013557704A JP2013557704A JP5735665B2 JP 5735665 B2 JP5735665 B2 JP 5735665B2 JP 2013557704 A JP2013557704 A JP 2013557704A JP 2013557704 A JP2013557704 A JP 2013557704A JP 5735665 B2 JP5735665 B2 JP 5735665B2
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- fusion protein
- npp1
- amino acid
- npp1 fusion
- acid residues
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Description
本出願は、2010年3月12日に出願された米国仮特許出願第61/340,066号明細書の利益を主張する2011年3月11日に出願された国際出願PCT/米国特許出願公開第2011/028233号明細書の利益を主張する。上記の出願の教示内容全体を参照により本明細書に援用する。
本発明のNPP1融合タンパク質(「TAGNPP1」)はすべて、天然ヒトNPP1のN末端の細胞質膜貫通ドメインを有する。任意選択で、本発明のTAGNPP1融合タンパク質は、C末端が切断された様々な長さの野生型NPP1をさらに含んでもよい。全長野生型NPP1のアミノ酸配列を配列番号1に示す。
TAGNPP1および適切な転写および翻訳制御エレメントをコードする配列を含む発現ベクターを構築するには、当業者によく知られている方法を使用することができる。こうした方法には、インビトロでの組換えDNA技術、合成技術およびインビボでの遺伝子組換えが含まれる。こうした技術は、たとえば、その教示内容の全体を参照により本明細書に援用するSambrook,Jら(1989)Molecular Cloning,A Laboratory Manual,Cold Spring Harbor Press,Plainview,N.Y.、およびAusubel,F.Mら(1989)Current Protocols in Molecular Biology,John Wiley & Sons,New York,N.Y.に記載されている。
本発明は、当該技術分野において周知であるような、たとえば、その開示内容の全体を参照により本明細書に援用する米国特許第7,534,929号明細書の、トランスジェニック鳥類(たとえば、トランスジェニックニワトリ)系で可溶性TAGNPP1を作製することを含む。標的化部分を含むあるいは含まないNPP1の構成成分(たとえば、ssNPP1、sNPP1、TAGsNPP1およびTAGssNPP1)を鳥類系(たとえば、鳥類の卵管)で作製することは、本発明の範囲内である。さらに、本明細書では、任意の有用なタンパク質発現系、以下に限定されるものではないが、トランスジェニック鳥類、トランスジェニック哺乳動物、細胞培養(たとえば、CHO細胞、HEK293細胞およびCOS細胞)、大腸菌(E.coli)などの細菌、トランスジェニック動物、たとえば哺乳動物および鳥類(たとえば、ニワトリ、ウズラ、アヒルおよびシチメンチョウ)、ならびにウキクサなどの植物系で産生されるTAGNPP1も意図している。
TAGNPP1は、種々のよく知られた技術のいずれかを用いて作製することができる。上記のようなDNA配列によりコードされるTAGNPP1は、本明細書に記載されたまたは当業者によく知られている種々の発現ベクターのいずれかを用いてDNA配列から容易に調製することができる。発現は、本発明の組換えポリペプチドをコードするDNA分子を含む発現ベクターで形質転換した、または本発明の組換えポリペプチドをコードするDNA分子を含む発現ベクターをトランスフェクトした任意の適切な宿主細胞で達成することができる。最初に、市販されているフィルターを使用して、組換え融合タンパク質またはポリペプチドを培養基に分泌する好適な宿主/ベクター系の上清を濃縮することができる。濃縮後、濃縮物を好適な精製マトリックス、たとえばアフィニティーマトリックスまたはイオン交換樹脂にかけることができる。1つまたは複数の逆相HPLCステップを利用して組換えポリペプチドをさらに精製することができる。
本発明はまた、単離され、実質的に精製されたTAGNPP1またはその薬学的に許容される塩を含む医薬組成物を特徴とする。本発明の医薬組成物は、薬学的に許容されるそのキャリアまたは賦形剤をさらに含んでもよい。複合分子を含むこうしたキャリアを含む組成物は、教示内容全体を参照により本明細書に援用する、よく知られた従来の方法(たとえば、RemingtonのPharmaceutical Sciences,第14版,Mack Publishing Co.,Easton、Pa.を参照されたい)により製剤化される。キャリアは、希釈液を含んでもよい。一実施形態では、薬学的キャリアは液体とすることができ、融合タンパク質は溶液の形態とすることができる。薬学的キャリアはワックスとすることも、脂肪とすることも、アルコールとすることもできる。別の実施形態では、薬学的に許容されるキャリアは、粉末、凍結乾燥粉末または錠剤の形態の固体であってもよい。一実施形態では、キャリアは、リポソームまたはマイクロカプセルを含んでもよい。
本明細書で使用する場合、本明細書で使用する製剤、組成物または成分に関し「許容される」という用語は、処置対象の被検体の一般的な健康状態に持続的な有害作用を及ぼさないことを意味する。
sNPP1に融合した連続した8個のアスパラギン酸を有する標的化部分を含むTAGsNNP1コンストラクトを、EcoRIおよびHindIII部位を使用してpTT22ベクターにライゲートした(pTT22−sNPP1.D8;図19)。pTT22−sNPP1.D8をHEK203E細胞にトランスフェクトし、形質転換体を培養してTAGsNNP1を発現させた。当該技術分野において周知のように、TAGsNNP1を培養基から単離し、部分的に精製した。精製後、TAGsNPP1のピロホスファーゼ/ホスホジエステラーゼ活性について、チミジン(thymmidine)5’一リン酸p−ニトロフェニルエステルを加水分解するその能力を測定した。簡単に説明すると、TAGsNPP1を50mMのトリス、250mMのNaCl、pH9.5で1ng/μLに希釈した。1ng/μLのTAGsNPP1を50μL含むプレートに、10mMのチミジン5’一リン酸p−ニトロフェニルエステル(Sigma(商標)、カタログ#T4510)基質50μLを加えた。TAGsNPP1の酵素活性は、405nm(吸光度)をキネティックスモードで5分間測定した。図21に示すように、TAGsNPP1の活性は、TAGsNPP1を含まない対照で観察されたレベルを超えて検出された。具体的には、HEK203D6から産生されたTAGsNPP1が最も高いレベルの酵素活性を示した。この結果から、標的化部分(すなわち、D8)に融合された切断型NPP1は、そのヌクレアーゼとしての通常の機能を十分に維持していたことが強く示唆される。
この非限定的かつ予言的な例は、TAGNPP1融合タンパク質を含む製剤を投与することにより、どのように特発性乳児動脈石灰化症を処置するかを記載する。
可溶性TAGsNPP1−D8の精製
可溶性形態のTAGsNPP1(C末端タグ化D8)(配列番号20および図26を参照されたい)は、HEK293コンディション培地から精製した。コンディション培地(500ml)をヒドロキシアパタイト(HA)緩衝液A(10mMのNa3PO4、pH6.8)で平衡化し、0.2μmのSartobran P Size 8 MidiCap Filter(Sartorius Stedim)で濾過した。20mlのHA−Ultrogelカラム(Pall Life Sciences)を5カラム体積(CV)の緩衝液Aで平衡化してから、濾過したコンディション培地を3ml/minで充填した。カラムをUVベースライン(UV baseline)になるまで緩衝液Aで洗浄した。HA緩衝液B(150mMのNa3PO4、pH6.8)、HA緩衝液C(250mMのNa3PO4、pH6.8)およびHA緩衝液D(500mMのNa3PO4、pH6.8)をそれぞれ2.5CV使用して、タンパク質を段階的に溶出しながら、5mlの画分を集めた。HAカラムの活性画分をプールし(50ml)、WGA緩衝液A(20mMのトリス、pH8.0、150mMのNaCl、0.7%CHAPS)で平衡化した。濾過後、6〜7mgの総タンパク質(15〜18ml)を、5CVのWGA緩衝液Aで平衡化した1mlのコムギ胚芽凝集素(WGA)自然落下カラム(Wheat Germ Agglutinin gravity column)(EMD Chemicals)に充填した。カラムを7CVのWGA緩衝液Aで洗浄し、次いでタンパク質を5×1mlのWGA緩衝液B(20mMのトリス、pH8.0、150mMのNaCl、500mMのN−アセチルグルコサミン、0.7%CHAPS緩衝液)で溶出した。WGA緩衝液Bをカラムと室温で10分間インキュベートさせてから、1mlの画分を集めた。WGAカラムにより出発材料がすべて精製されるまでこのプロセスを繰り返した(合計4回)。活性画分(29ml)をプールし、分画分子量(MWCO)100,000のVivaspin−15(Sartorius Stedim)を用いて1.2mlに濃縮し、同時に緩衝液をPBSに交換した。
ヒト大動脈平滑筋細胞を1×104細胞/ウェルで48ウェルプレートに蒔き、標準的な条件下、ダルベッコ変法イーグル培地(DMEM)で維持した。2日後、DMEMにNaPO4およびATPをそれぞれ3.8mMおよび50uM補充した。sNPP1(WT;図9)、C末端に融合した連続した8個のアスパラギン酸残基(D8)を有するTAGsNPP1(図26)、およびsNPP1−Fc(図29)を1ug/mlで補充した。培地は1日おきに同じものと交換した。5日後、培養液から培地を除去し、100ulの0.6NのHClと交換し、16〜20時間室温でインキュベートし、この溶液にリン酸カルシウムを溶解させた。次いでCayman Chemical Company,Ann Arbor,MI製のCalcium Assay Kit(#700550)を使用して、比色定量のカルシウム−クレゾールフタレイン反応によりカルシウムのレベルを定量した。
sNPP1−Fcの酵素活性アッセイ
1ugのsNPP1−Fc(図29)の添加は、純度70%を基準にした(すなわちアッセイには、約1.1μgのsNPP1−Fcを使用した)。HPLCサイズ排除カラム(SEC)からは、sNPP1−Fcが純度約78%であることが示される。非還元ゲルでは、予想された大きさ(約250kD)で2量体が示された。2量体バンドは、DTTで処理すると、予想された単量体の大きさ(約125kD)に小さくなった。ウエスタンブロット解析から、2量体および単量体のバンドが確認された。sNPP1−FcサンプルをPNGase Fで処理すると、単量体のバンドが約125kDから予想された分子量である約100kDに小さくなり、これはsNPP1−Fcは12のN−グリカン部位を含むと考えるときに想定される分子量である。純度78%では、最終的な定量により約0.808mgのsNPP1−Fcが得られた(2.2μg/mlのコンディション培地)。sNPP1−Fcの酵素活性は、当該技術分野において公知の通り決定した。
Claims (22)
- NPP1構成成分と、標的化部分と、免疫グロブリンのFc領域と、を含む単離されたNPP1融合タンパク質において、a)前記NPP1構成成分がNPP1のシステインリッチ領域と、ピロホスファターゼ活性および/またはホスホジエステラーゼ活性を有するNPP1のC末端触媒ドメインを含み、b)前記標的化部分とFc領域がそれぞれ前記NPP1構成成分のC末端にあり、c)前記単離されたNPP1融合タンパク質がピロホスファターゼ活性および/またはホスホジエステラーゼ活性を有することを特徴とする、単離されたNPP1融合タンパク質。
- 請求項1に記載のNPP1融合タンパク質において、前記NPP1融合タンパク質は組換えタンパク質であることを特徴とするNPP1融合タンパク質。
- 請求項1に記載のNPP1融合タンパク質において、前記標的化部分はNPP1の前記触媒ドメインに化学的に連結されることを特徴とするNPP1融合タンパク質。
- 請求項1に記載のNPP1融合タンパク質において、前記NPP1構成成分は配列番号1のP99〜D925を含むことを特徴とするNPP1融合タンパク質。
- 請求項4に記載のNPP1融合タンパク質において、前記標的化部分は負電荷を持つ少なくとも4個のアミノ酸残基を含むペプチドであることを特徴とするNPP1融合タンパク質。
- 請求項4に記載のNPP1融合タンパク質において、前記標的化部分は負電荷を持つ5〜15個のアミノ酸残基を含むペプチドであることを特徴とするNPP1融合タンパク質。
- 請求項6に記載のNPP1融合タンパク質において、前記負電荷を持つアミノ酸残基は8個の連続したアスパラギン酸またはグルタミン酸残基を含むことを特徴とするNPP1融合タンパク質。
- 請求項6に記載のNPP1融合タンパク質において、前記負電荷を持つアミノ酸残基は少なくとも4個のアスパラギン酸残基を含むことを特徴とするNPP1融合タンパク質。
- 請求項6に記載のNPP1融合タンパク質において、前記負電荷を持つアミノ酸残基は少なくとも4個のグルタミン酸残基を含むことを特徴とするNPP1融合タンパク質。
- 請求項6に記載のNPP1融合タンパク質において、前記負電荷を持つアミノ酸残基は連続した8個のアスパラギン酸残基を含むことを特徴とするNPP1融合タンパク質。
- 請求項4に記載のNPP1融合タンパク質において、前記標的化部分はNPP1の前記触媒ドメインのC末端に融合されることを特徴とするNPP1融合タンパク質。
- 請求項4に記載のNPP1融合タンパク質において、前記Fc領域はNPP1の前記触媒ドメインのC末端に融合されることを特徴とするNPP1融合タンパク質。
- 請求項1に記載のNPP1融合タンパク質において、前記融合タンパク質は前記標的化部分とNPP1の前記触媒ドメインとの間にポリペプチドリンカーをさらに含むことを特徴とするNPP1融合タンパク質。
- 請求項1に記載のNPP1融合タンパク質において、前記融合タンパク質はシグナルペプチドをさらに含むことを特徴とするNPP1融合タンパク質。
- 請求項1に記載のNPP1融合タンパク質において、前記融合タンパク質はホモ2量体を形成することを特徴とするNPP1融合タンパク質。
- 請求項1に記載のNPP1融合タンパク質において、前記融合タンパク質は単量体であることを特徴とするNPP1融合タンパク質。
- 請求項1に記載のNPP1融合タンパク質をコードすることを特徴とする単離された核酸。
- 請求項17に記載の単離された核酸を有することを特徴とする複製または発現ベクター。
- 請求項17に記載の複製または発現ベクターで形質転換されていることを特徴とする宿主細胞。
- 請求項19に記載の宿主細胞において、前記宿主細胞はCHO細胞、HEK293細胞またはCOS細胞からなる群から選択されることを特徴とする宿主細胞。
- 請求項1に記載のNPP1融合タンパク質を産生することを特徴とする非ヒトトランスジェニック動物。
- 請求項21に記載のトランスジェニック動物において、前記非ヒトトランスジェニック動物は哺乳動物または鳥類であることを特徴とするトランスジェニック動物。
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JP6484905B2 (ja) | 2019-03-20 |
US20170145393A1 (en) | 2017-05-25 |
JP2015164427A (ja) | 2015-09-17 |
EP2545080A2 (en) | 2013-01-16 |
US20210301268A1 (en) | 2021-09-30 |
WO2011113027A3 (en) | 2012-03-01 |
JP2014509851A (ja) | 2014-04-24 |
SG10202100341XA (en) | 2021-02-25 |
US20130273021A1 (en) | 2013-10-17 |
CL2013002607A1 (es) | 2014-03-28 |
ES2628841T3 (es) | 2017-08-04 |
EP2545080A4 (en) | 2013-09-11 |
US20140154774A1 (en) | 2014-06-05 |
EP2545080B1 (en) | 2017-05-10 |
US20230129977A1 (en) | 2023-04-27 |
BR112013023010A2 (pt) | 2018-07-03 |
US9540621B2 (en) | 2017-01-10 |
TR201903573T4 (tr) | 2019-04-22 |
US20150024460A1 (en) | 2015-01-22 |
ES2716526T3 (es) | 2019-06-13 |
US20140377859A1 (en) | 2014-12-25 |
SG10201500208SA (en) | 2015-03-30 |
JP6096826B2 (ja) | 2017-03-15 |
BR112013023010B1 (pt) | 2022-05-10 |
NZ615070A (en) | 2015-10-30 |
US8846603B2 (en) | 2014-09-30 |
JP2017137318A (ja) | 2017-08-10 |
WO2011113027A2 (en) | 2011-09-15 |
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