Wako和光純藥 125-05061 賴氨酰肽鏈內(nèi)切酶

Wako和光純藥 125-05061 賴氨酰肽鏈內(nèi)切酶

貨號(hào):125-05061
包裝:20ug x5

  • 英文名:Lysyl Endopeptidase, Mass Spectrometry Grade
  • 級(jí)別:for Proteome Research
  • 分子量:27,500
  • 品牌:Wako
  • 外觀:Lyophilisate. Keep at -20 degrees C.

賴氨酰肽鏈內(nèi)切酶(Lysyl Endopeptidase)可以特異性剪切除賴氨酸殘基C末端和S-氨乙基半胱氨酸殘基的肽鍵,用于蛋白測(cè)序和Lys-X 化合物的酶催化合成。該酶(#125-05061)穩(wěn)定性高,在4M 尿素或0.1%SDS 溶液中30度孵育6小時(shí)之后,仍然擁有完整的生物活性。

*上海金畔生物提示:我司所銷售的化學(xué)試劑、原料等所有產(chǎn)品(包括但不限于抗生素類、蛋白質(zhì)類、試劑盒類產(chǎn)品等)僅限用于科學(xué)研究用途,不得作用于人體。

質(zhì)譜級(jí) 賴氨酰肽鏈內(nèi)切酶 Lysyl Endopeptidase
賴氨酰肽鏈內(nèi)切酶(Lysyl Endopeptidase)最初由Masaki等人從土壤細(xì)菌中分離得到。該酶可以特異性剪切除賴氨酸殘基C末端和S-氨乙基半胱氨酸殘基的肽鍵,用于蛋白測(cè)序和Lys-X 化合物的酶催化合成。上海金畔生物專業(yè)提供Wako多種級(jí)別賴氨酰肽鏈內(nèi)切酶,該酶穩(wěn)定性高,在4M 尿素或0.1%SDS 溶液中30℃孵育6小時(shí)之后,仍然擁有完整的生物活性。
質(zhì)譜級(jí)賴氨酰肽鏈內(nèi)切酶是質(zhì)譜分析前處理時(shí)最常用的蛋白分解酶。若同時(shí)使用賴氨酰肽鏈內(nèi)切酶和胰酶,可更好地切斷賴氨酸基團(tuán)的多肽,增加多肽的數(shù)量。產(chǎn)品已按照使用習(xí)慣做成小包裝,是方便使用的冷凍干燥品。
質(zhì)譜級(jí) 賴氨酰肽鏈內(nèi)切酶 Lysyl Endopeptidase 理化特性
表1賴氨酰肽鏈內(nèi)切酶理化特性表
外觀
凍干粉(包含2 mmol/L Tris-HCl buffer,pH 8)
活性
0.03~0.07AU/vial
分子量
27,000(凝膠過(guò)濾);30,000 (SDS-PAGE)
溶解性
易溶于水或緩沖液
佳pH
9.0-9.5(酰胺酶的佳活性pH)
等電點(diǎn)
6.9-7.0
抑制劑
DFP、PMSF、TLCK
來(lái)源
細(xì)菌
穩(wěn)定性
溶于pH 值5.0-12.0 的Tris緩沖液中,可于4℃穩(wěn)定保存2年。溶于pH 值6.0-11.0 的緩沖液中,可于30℃穩(wěn)定保存,但是50℃及以上不穩(wěn)定。
單位定義
一單位酰胺酶(AU) 指在30℃ pH 9.5 時(shí)每分鐘產(chǎn)生1 μmol 對(duì)硝基苯胺所需的酶量。
底物特異性
水解底物:Tos-Lys-Ome、Bz-Lys-NH2、Bz-Lys-pNA、Lys-pNA
非水解底物:Bz-Arg-NH2、Bz-Arg-pNa、Arg-pNA
質(zhì)譜級(jí) 賴氨酰肽鏈內(nèi)切酶 Lysyl Endopeptidase 產(chǎn)品特點(diǎn)
  • 高特異性、高蛋白質(zhì)消化率、適用于蛋白質(zhì)譜分析
  • 提高裂解效率、增加肽段數(shù)量
  • 根據(jù)使用量特意制備小包裝,方便使用
質(zhì)譜級(jí) 賴氨酰肽鏈內(nèi)切酶 Lysyl Endopeptidase 應(yīng)用實(shí)例
分別采用胰蛋白酶(Tp)、賴氨酰肽鏈內(nèi)切酶(Lep) 和Tp 與Lep聯(lián)用進(jìn)行膠內(nèi)酶切的效果比較:牛血清蛋白BSA 的條帶(100ng) 通過(guò)SDS-PAGE 獲得,然后分別用Tp、Lep 和Lep+Tp 進(jìn)行酶切,再用MALDI-TOFMS 法進(jìn)行分析。蛋白酶的實(shí)驗(yàn)效果如下表:
表2 Tp、Lep 和 Lep+Tp 的蛋白酶酶切結(jié)果對(duì)照
Tp
Lep
Lep +Tp
裂解位點(diǎn)
精氨酸和賴氨酸的C端
賴氨酸的C端
精氨酸和賴氨酸的C端
錯(cuò)誤裂解率
(錯(cuò)誤裂解所占比例)
多(8%)
很少(0%)
少(3%)
鑒定出的多肽數(shù)量
17
19
22
結(jié)果表明 Lep 酶解的錯(cuò)誤裂解率最低,Tp酶解時(shí)加入Lep后,錯(cuò)誤裂解率有所降低,同時(shí),可以鑒定出更多的多肽。

圖1 胰蛋白酶 (Tp)(圖 a) 和賴氨酰肽鏈內(nèi)切酶 (Lep)+Tp (圖 b) 酶切后的質(zhì)譜結(jié)果對(duì)照?qǐng)D。

Lep+Tp酶切后,可以在m/z=2000時(shí)得到吸收峰,而單獨(dú)的Tp酶切在m/z=2000時(shí)沒(méi)有吸收峰。該結(jié)果表明Lep可以提高測(cè)序覆蓋度。
( 數(shù)據(jù)由大阪醫(yī)療中心和婦嬰健康研究所Y. Wada博士提供 )
質(zhì)譜級(jí) 賴氨酰肽鏈內(nèi)切酶 Lysyl Endopeptidase 產(chǎn)品列表
品牌
產(chǎn)品編號(hào)
產(chǎn)品名稱
產(chǎn)品規(guī)格
產(chǎn)品等級(jí)
Wako
125-05061
Lysyl Endopeptidase, MS Grade
賴氨酰肽鏈內(nèi)切酶,MS級(jí)
20μgx5
質(zhì)譜級(jí)
Wako
125-02543
Lysyl Endopeptidase (R)
賴氨酰肽鏈內(nèi)切酶
1vial(2AU)
for Biochemistry
Wako
129-02541
Lysyl Endopeptidase (R)
賴氨酰肽鏈內(nèi)切酶
1vial(10AU)
for Biochemistry
質(zhì)譜級(jí) 賴氨酰肽鏈內(nèi)切酶 Lysyl Endopeptidase 參考文獻(xiàn)
  1. Wada, Y., and Kadoya, M.: J. Mass Spectrom., 38, 117 (2003).
  2. Shevchenko, A., Wilm, MM., Vorm, O., and Mann., M.: Anal. Chem., 68, 850 (1996).
上海金畔生物專業(yè)提供Wako賴氨酰肽鏈內(nèi)切酶,正品保障,值得您信賴!
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