木瓜蛋白酶中英文說明書
Papain is a sulfhydryl protease from Carica papaya latex. It has a molecular weight of 23 kDa and an optimum pH range of 6.0-7.0. ?The action of papain on leucine methyl ester produces an insoluble polyleucine peptide. Papain breaks down the intercellular matrix of cartilage. Papain is activated by cysteine, sulfide, and sulfite. Stabilizing agents are EDTA, cysteine and dimercaptoethanol.
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Stability/Storage: Stable for 6-12 months at 2-8°C. ?Do not freeze aqueous suspensions.
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Technical Notes: Papain preparations should be incubated in the activation solution before use to ensure full activity. Applications include antibody fragmentation and primary/neural cell isolation.
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Unit Definition: One Unit hydrolyzes one micromole of benzoyl-L-arginine ethyl ester per minute at 25°C, pH 6.2, after activation in a solution containing 1.1 mM EDTA, 0.067 mM mercaptoethanol and 5.5 mM cysteine-HCl for 30 minutes.
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木瓜蛋白酶功能特性:
木瓜蛋白酶主要用于啤酒抗寒(水解啤酒中的蛋白質(zhì),避免冷藏后引起的渾濁)、肉類軟化(水解肌肉蛋白和膠原蛋白,使肉類軟化)、谷類預(yù)煮的準(zhǔn)備、水解蛋白質(zhì)和肉類香料的生產(chǎn)。在啤酒抗寒和肉類軟化方面的應(yīng)用遠(yuǎn)比其他蛋白酶類廣泛。
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艾美捷Worthington木瓜蛋白酶特異性:
木瓜蛋白酶具有相當(dāng)廣泛的特異性;它具有內(nèi)肽酶、酰胺酶和酯酶活性?;钚晕稽c(diǎn)由七個亞位點(diǎn)(S 1 -S 4和?S 1' -S 3')組成,每個亞位點(diǎn)可以容納底物的一個氨基酸殘基(P 1 -P 4和?P 1' -P 3')(Schechter和伯杰?1967)。特異性由?S 2亞位點(diǎn)控制,S 2?亞位點(diǎn)是一個容納底物?P 2側(cè)鏈的疏水袋。木瓜蛋白酶表現(xiàn)出特定的底物偏好,主要是對該子位點(diǎn)的大量疏水或芳香殘基(Kimmel?和?Smith 1954)。在?S 2之外子位點(diǎn)偏好,活性位點(diǎn)內(nèi)缺乏明確定義的殘基選擇性。
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木瓜蛋白酶相關(guān)研究:
膠原酶?(CLS1-4/CLSPA)
脫氧核糖核酸酶?I (DP/D/DCLS/D2/DPFF/DPRF)
透明質(zhì)酸酶?(HSE/HSEP)
中性蛋白酶?(Dispase, NPRO)
蛋白酶?K (PROK)
胰蛋白酶?(TL/TRL/TRL3/TRLS /TRTPCK)
胰蛋白酶抑制劑?(LBI/OI/SI/SIC)
細(xì)胞分離優(yōu)化系統(tǒng)?(CIT)
肝細(xì)胞分離系統(tǒng)?(HIS)
新生兒心肌細(xì)胞分離系統(tǒng)?(NCIS)
木瓜蛋白酶解離系統(tǒng)?(PDS/PDS2)