JP5311537B2 - 藻類由来のampデアミナーゼ - Google Patents
藻類由来のampデアミナーゼ Download PDFInfo
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- JP5311537B2 JP5311537B2 JP2008029481A JP2008029481A JP5311537B2 JP 5311537 B2 JP5311537 B2 JP 5311537B2 JP 2008029481 A JP2008029481 A JP 2008029481A JP 2008029481 A JP2008029481 A JP 2008029481A JP 5311537 B2 JP5311537 B2 JP 5311537B2
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- 230000008685 targeting Effects 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 210000004881 tumor cell Anatomy 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 235000019583 umami taste Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000003442 weekly effect Effects 0.000 description 1
Landscapes
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Peptides Or Proteins (AREA)
- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
- Enzymes And Modification Thereof (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
Description
Noda H、 Horiguchi Y、 Araki S、 1975、 Studies on the flavor substances of'Nori' the dried laver Porphyra spp. -II Free amino acids and 5'-nucleotides、 Bull Japanese Soc Sci Fish 41: 1299-1303. 荒木繁、桜井武麿、泉野友香、高橋幸資、 1996、 乾海苔の5'イノシン酸とその酵素的生成、 Nippon Shokuhin Kagaku KogakuKaishi 43: 956-961. 荒木繁、泉野友香、桜井武麿、高橋幸資、 1997、 温水抽出物による焼海苔の呈味性評価、 Nippon Shokuhin Kagaku KogakuKaishi 44: 430-437. Merkler、 DJ.、 Wali、 AS.、 Taylor、 J.、 and Schramm、 VL.、1989、 AMP deaminase from Yeast. Role in AMP degradation、 large scale purification、 and properties ofthe native and proteolyzed enzyme. J. Biol. Chem. 264: 21422-21430.
(a)配列番号:2に記載のアミノ酸配列からなるタンパク質をコードするDNA
(b)配列番号:1に記載の塩基配列のコード領域からなるDNA
(c)配列番号:2に記載のアミノ酸配列において1または複数のアミノ酸が置換、欠失、付加、および/または挿入されたアミノ酸配列からなるタンパク質をコードするDNA
(d)配列番号:1に記載の塩基配列からなるDNAとストリンジェントな条件下でハイブリダイズするDNA。
全ての操作は4℃もしくは氷冷して行った。遠心分離は、12000gX10 minで行った。100gの藻体に200 mLのバッファーA(50 mM Tris-HCl pH 7.5、 1 mM 2-メルカプトエタノール、 20 mM CaCl2)を加え自動乳鉢で破砕した後、ナイロンガーゼで残渣を除き、遠心分離(12、000 gX10 min)を行い上精を粗抽出液とした。粗抽出液を、45%-80%飽和の硫酸アンモニウムによって塩析後、沈殿を150 mLの抽出バッファーで溶解した。これをバッファーAに対して透析し、20%ポリエチレングリコール/15%硫酸アンモニウム処理(Phycol Res 53: 164-168,2005.)で生じた上精を回収後、バッファーAに対して再び透析した。その後、バッファーB(50 mM Tris-HCl pH 7.5、 1 mM 2-メルカプトエタノール、 20 mM CaCl2、 10% ソルビトール)で平衡化した Blue Sepharose CL6Bカラム(2cm x 5 cm、 GEヘルスケア)に供し、バッファーBで洗浄後、2 M NaClを含むバッファーBで溶出した.活性のあるフラクションを回収し、バッファーBに対して透析した後、MonoQ HR5/5 (GEヘルスケア)を用いた陽イオン交換クロマトグラフィーを行った。カラムは前もってバッファーBで平衡化し、試料の添加後に同バッファーで洗浄し、250 mM NaClを含むバッファーBを用いてグラディエント溶出した。活性のあるフラクションを回収し、バッファーBで平衡化したSuperdex HRカラム(GEヘルスケア)に添加し、バッファーBで溶出した後、活性画分を回収し、精製標品を得た(表1)。
精製標品をSDS-PAGE(%T=10%)に供した後、分離されたタンパク質を亜鉛染色により可視化し、当該バンドを切り出し、SDS-PAGEの泳動バッファーを用いて抽出した(Jpn. J. Phycol. 52 (Supplement): 95-100,2004)。得られた試料を限外ろ過により濃縮後(ミリポア、Centricon YM-10)、試料70μgにリシルエンドペプチターゼ20 ngを加え、37℃で13 hインキュベートし、SDS-PAGE (%T=15%)により断片を分離した後、PVDF膜に転写した(J. Biol. Chem. 280: 18462-18468,2004.)。転写されたタンパク質断片はCBBにより可視化し、当該のバンドを切り出し、エドマン分解によりそのN末端アミノ酸配列を分析した(model 477A、 Applied Biosystem、Caloglossa continua (Ceramiales、Rhodophyta). Mar. Biotechnol. 3: 493-500,2001.)。その結果を図1に示す。
AMPDの25番目のアミノ酸から最終アミノ酸までに相当する遺伝子を、3'-RACE用に逆転写したDNAを鋳型として5'-末端にBam HI切断領域を3'-末端にXba I切断領域を付加したプライマー(それぞれプライマーleft_Bamおよびプライマーright_Xba(表4)を用いて増幅し、pGEM-T Easyベクターを用いての増幅を経て、最終的にpCold IIベクター(タカラバイオ)に組み込んだ後、マニュアルに従い組換えタンパク質の発現を行った。
免疫染色は二次抗体にアルカリホスファターゼ結合ウサギ抗マウスIgG抗体を用い、AP発色キット(バイオラッド)で発色することで行った。その結果、得られた抗体は、組換え蛋白質に特異的に結合していた(図4)。
Claims (17)
- 藻類由来のAMPデアミナーゼをコードする下記(a)から(c)のいずれかに記載のDNA。
(a)配列番号:2に記載のアミノ酸配列からなるタンパク質をコードするDNA
(b)配列番号:1に記載の塩基配列の1〜1569位からなるDNA
(c)配列番号:2に記載のアミノ酸配列と90%以上の相同性を有するアミノ酸配列からなるタンパク質をコードするDNA
- AMPデアミナーゼが耐熱性である、請求項1に記載のDNA。
- 請求項1または2に記載のDNAを含むベクター。
- 請求項1または2に記載のDNA、または請求項3に記載のベクターが導入された形質転換細胞。
- 請求項1または2に記載のDNAによりコードされる蛋白質。
- 請求項4に記載の形質転換細胞を培養し、培養物または培養上清から請求項5に記載の蛋白質を回収する工程を含む、請求項5に記載の蛋白質の製造方法。
- 請求項5に記載の蛋白質に結合する抗体。
- 請求項1または2に記載のDNA、または請求項3に記載のベクターが導入された植物細胞。
- 請求項8に記載の植物細胞を含む形質転換植物体。
- 請求項9に記載の形質転換植物体の子孫またはクローンである、形質転換植物体。
- 請求項9または10に記載の形質転換植物体の繁殖材料。
- 請求項9または10に記載の形質転換植物体または請求項11に記載の繁殖材料を加工して製造された食品。
- 請求項5に記載の蛋白質が添加された食品。
- 藻類における請求項5に記載の蛋白質の量を検出することを特徴とする、藻類を評価又は選別する方法。
- 請求項5に記載の蛋白質の量を、藻類の呈味性の指標とする、請求項14に記載の方法。
- 請求項7に記載の抗体を有効成分とする、請求項5に記載の蛋白質の検出試薬。
- 藻類の呈味性の評価に用いられる、請求項16に記載の検出試薬。
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