JP5193476B2 - クロストリジウム・ブチリカムのバクテリオシンをコードする遺伝子およびそのタンパク質 - Google Patents
クロストリジウム・ブチリカムのバクテリオシンをコードする遺伝子およびそのタンパク質 Download PDFInfo
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- JP5193476B2 JP5193476B2 JP2007037948A JP2007037948A JP5193476B2 JP 5193476 B2 JP5193476 B2 JP 5193476B2 JP 2007037948 A JP2007037948 A JP 2007037948A JP 2007037948 A JP2007037948 A JP 2007037948A JP 5193476 B2 JP5193476 B2 JP 5193476B2
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Landscapes
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
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Description
日本細菌学会誌43(4)、829(1988) 感染症学会誌64(11)、1425(1990)
限定されることはない。
Cloctridium butyricum MIYAIRI 588(以下、CBM588と称する)の菌体200mgを50mM Tris−HCl(pH8.0)(25%sucrose,1mg/ml lysozyme)1mlに懸濁し、室温で15分間インキュベートした。該懸濁液に10mlの溶解バッファー(50mM Tris−20mM EDTA中2% SDS,pH12.5)を加えて混合した後、34℃で20分間インキュベートした。その後、7mlの2M Tris−HCl(pH7.0)と1.2mlの5M NaClとを添加し、4℃で4時間静置した。フェノール抽出、エタノール沈殿処理し、該処理物を150μlのRNase(20μg/ml)を含むTEバッファーで溶解した。これを0.7%のアガロースゲルで電気泳動後、エチジウムブロマイドで染色し、QIAquick Gel extraction キット(Qiagen社製)を用いてプラスミドを抽出した。
シグナルペプチドを除いたバクテリオシン遺伝子を大腸菌発現ベクターに組み込むために、図2に示されるようにして以下の操作を行った。
よって菌体を回収し、−20度で凍結した(誘導菌体)。
組換えバクテリオシンの活性を測定するために、SDSとβ−メルカプトエタノールを2×Laemmliサンプルバッファーから除いた非還元のSDS−PAGEを行った。サンプルは溶出電気泳動終了後、ゲルを固定液(20%イソプロパノール、10%酢酸、70%水)で固定した後、水で洗浄し、最後にPBS中で30分間振とうした。変法GAM寒天培地「ニッスイ」(日水製薬社製)にゲルを載せ、その上に0.75%寒天と1%の指示菌(C.pasteurianum JCM1408)の培養液を含むGAMブイヨン「ニッスイ」(日水製薬社製)を重層し、37℃で16時間嫌気培養を行った。図4Bに、溶出1回目のサンプル(図3のレーン7)の結果を示す。図4Bに示すように、図3の10kDa付近のバンドのタンパク質(以下、このタンパク質をバクテリオシンAと称する)が抗菌活性を示すことがわかった。バクテリオシンAは、約34kDaの完全なバクテリオシン(バクテリオシンB)の一部である。バクテリオシンAは図4Aで示したように免疫染色によってHisタグが検出されたため、バクテリオシンBのC末端領域であることが示された。
96穴のマルチプレートにGAMブイヨンでバクテリオシンを含む試料(溶出画分とCBM588をGAMブイヨン24時間培養した上清)を連続2倍希釈して100μずつ分注し、そこに1%の指示菌(C.pasteurianum JCM1408(ATCC6013))を含むGAMブイヨンを100μL添加した。37℃で16時間嫌気培養した後、600nmの吸光度を測定した。サンプル無添加の対照と比べ50%以上の増殖抑制が認められた希釈段階をバクテリオシンの活性単位(AU)とした。結果を表1に示す。
GAM寒天培地「ニッスイ」(日水製薬社製)の上に0.75%寒天と1%の指示菌(Clostridium difficile JCM 1296(ATCC9689))の培養液を含むGAMブイヨンを重層した。その上に6mmのペーパーディスクを載せ、25μlのサンプルを添加後、37℃で16時間嫌気培養を行った。ディスクの周囲に認められる透明の増殖阻止帯を観察した。サンプルは、上記溶出1を用い、50mM PBSを用いて10倍〜100倍に希釈した。
試料は、溶出1を50mM トリスバッファー(pH8.0)で100倍希釈したものを用いた。
Claims (7)
- 以下の(a)または(b)のDNAからなる遺伝子:
(a)配列番号1の塩基配列からなるDNA;または
(b)上記(a)の塩基配列と90%以上の相同性を有し、かつバクテリオシン活性を有するタンパク質をコードするDNA。 - 以下の(c)または(d)の組換えタンパク質:
(c)配列番号2のアミノ酸配列からなるタンパク質;または
(d)配列番号2のアミノ酸配列において1〜8個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつバクテリオシン活性を有するタンパク質。 - 以下の(e)または(f)の組換えタンパク質:
(e)配列番号3のアミノ酸配列からなるタンパク質;または
(f)配列番号3のアミノ酸配列において1〜8個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつバクテリオシン活性を有するタンパク質。 - 請求項1に記載の遺伝子を含有する組換えベクター。
- 請求項1に記載の遺伝子および該遺伝子に連結されたプロモーターまたは他の調節配列を含有する組換えベクター。
- 請求項4または5に記載の組換えベクターを含む宿主細胞。
- 請求項2または3に記載の組み換えタンパク質を含む医薬組成物。
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