JP4982908B2 - 歯周病菌プロテアーゼ阻害剤ならびに抗歯周病菌剤 - Google Patents
歯周病菌プロテアーゼ阻害剤ならびに抗歯周病菌剤 Download PDFInfo
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- JP4982908B2 JP4982908B2 JP2007251996A JP2007251996A JP4982908B2 JP 4982908 B2 JP4982908 B2 JP 4982908B2 JP 2007251996 A JP2007251996 A JP 2007251996A JP 2007251996 A JP2007251996 A JP 2007251996A JP 4982908 B2 JP4982908 B2 JP 4982908B2
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- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
Description
コシヒカリ精白米をサンプルミルで粉砕し、これに10倍量の50mM トリス−HCl(pH8.0)/500mM NaCl緩衝液を加えて4℃で30分撹拌した。撹拌後、10,000rpm×15分間の遠心分離によって固形分を除去し、上清に対して80℃で10分間の加熱処理を行った。更に、10,000rpm×15分間の遠心分離で沈殿物を除去し、その上清を蛋白質抽出液とした。
酵素標品には歯周病菌ポルフィロモナス・ジンジバリス(Porphyromonas gingivalis ATCC33277)から精製したアルギニン−ジンジパインを用いた。阻害活性測定用の緩衝液は、100mM HEPES(pH7.5)/150mM NaCl/5mM CaCl2/0.05% Brij35/4mM ジチオスレイトール(DTT)とし、反応は2ml容積で行った。所定濃度のサンプルとアルギニン−ジンジパイン40pMを40℃で5分間プレインキュベーションした後、酵素基質としてZ−Phe−Arg−MCAを50μMの濃度になるように加えて、酵素反応を開始した。反応の進行は蛍光分光光度計(励起波長380nm;蛍光波長440nm)を用いて、蛍光強度の増加としてモニタリングし、酵素反応の強さは基質から遊離するアミノメチルクマリン(AMC)量で評価した。酵素阻害活性1ユニット(U)は、酵素基質から1分間に1μmolのAMC遊離を阻害する量と定義した。
上記蛋白質抽出液を限外ろ過膜(分画分子量5,000Da)を用いて濃縮すると共に、緩衝液を7M 尿素/2M チオ尿素に置換した。このサンプルを7M 尿素/2M チオ尿素/4% CHAPS/20mM DTT/1% ZOOMキャリアアンフォライト(pH3〜10;インビトロジェン製)溶液とした後、10,000rpm×15分間の遠心分離によって沈殿物を除去し、等電点電気泳動(IEF)を行った。電気泳動にはpH3.0、pH5.4、pH6.2とpH10.0のディスクを装着したIEFフラクショネーター(インビトロジェン製)を用いた。IEFで得られた各pH画分の試料について、歯周病菌プロテアーゼに対する阻害活性を上述の方法により測定した(表1)。歯周病菌プロテアーゼ阻害活性は、その約80%がpH5.4〜6.2の等電点範囲で回収することができた。歯周病菌プロテアーゼに対して阻害活性を有する蛋白質は、その多くが等電点5.0〜6.5の範囲の蛋白質であることは明らかである。
上述の等電点電気泳動におけるpH5.4〜6.2の画分から、歯周病菌プロテアーゼ阻害蛋白質を、歯周病菌プロテアーゼを固定化したアフィニティ−ビーズを用いて分離した。
分離した歯周病菌プロテアーゼ阻害蛋白質にトリフルオロ酢酸(TFA)を0.1%になるよう加え、ZipTip C18(Millipore製)に結合・洗浄し、50% アセトニトリル/0.1% TFA溶液で溶出した。溶出液は80℃で乾固させた後、50mM NH4HCO3にて溶解し、0.2mM DTT存在下で50℃、15分間の還元処理、次いで0.27mM ヨードアセトアミド存在下でのアルキル化処理を行った。その後、トリプシン(Promega製)を0.5ng/μlになるよう加えて、37℃で15時間のインキュベーションによる酵素消化を行った。
配列番号1に示されるアミノ酸配列を有する蛋白質の、54番目から60番目までのアミノ酸残基に相当するペプチド配列(Arg−Thr−Leu−Val−Arg−Arg−Gln)をRA17(27−33)、配列番号4に示されるアミノ酸配列を有する蛋白質の、14番目から25番目までのアミノ酸残基に相当するペプチド配列(Arg−Arg−Leu−Met−Ala−Ala−Lys−Ala−Glu−Ser−Arg−Lys)をCH(14−25)として、それぞれ化学合成し(シグマアルドリッチジャパン)、上述の方法に従って歯周病菌プロテアーゼ阻害活性を測定した(図1)。この結果から、歯周病菌プロテアーゼ阻害蛋白質の部分ペプチドが、歯周病菌プロテアーゼに対して阻害活性を有することがわかった。従って、歯周病予防を目的とした機能因子として有用であることは明らかである。
上述のペプチドCH(14−25)について、歯周病菌ポルフィロモナス・ジンジバリスに対する増殖阻害活性を測定した。
Claims (4)
- 配列番号1に示されるアミノ酸配列を有する蛋白質の、54番目から60番目までのアミノ酸残基に相当するペプチド配列(Arg−Thr−Leu−Val−Arg−Arg−Gln)、又は、配列番号4に示されるアミノ酸配列を有する蛋白質の、14番目から25番目までのアミノ酸残基に相当するペプチド配列(Arg−Arg−Leu−Met−Ala−Ala−Lys−Ala−Glu−Ser−Arg−Lys)を有効成分として含有することを特徴とする歯周病菌プロテアーゼ阻害剤。
- 歯周病菌ポルフィロモナス・ジンジバリス(Porphyromonas gingivalis)プロテアーゼに対する阻害活性を有することを特徴とする請求項1に記載の歯周病菌プロテアーゼ阻害剤。
- 配列番号4に示されるアミノ酸配列を有する蛋白質の、14番目から25番目までのアミノ酸残基に相当するペプチド配列(Arg−Arg−Leu−Met−Ala−Ala−Lys−Ala−Glu−Ser−Arg−Lys)を有効成分として含有することを特徴とする抗歯周病菌剤。
- 歯周病菌ポルフィロモナス・ジンジバリス(Porphyromonas gingivalis)に対する抗菌作用を有することを特徴とする請求項3に記載の抗歯周病菌剤。
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