编号: | 191876 |
中文名称: | Suc-丙氨酰-丙氨酰-丙氨酰-对硝基苯胺、Suc-Ala-Ala-Ala-pNA |
CAS号: | 52299-14-6 |
单字母: | Suc-AAA-pNA |
三字母: | Suc N端丁二酸修饰 -Ala丙氨酸 -Ala丙氨酸 -Ala丙氨酸 -pNA对硝基苯胺 |
氨基酸个数: | 3 |
分子式: | C19H25O8N5 |
平均分子量: | 451.43 |
精确分子量: | 451.17 |
等电点(PI): | - |
pH=7.0时的净电荷数: | - |
平均亲水性: | -0.5 |
疏水性值: | 1.8 |
消光系数: | - |
标签: | pNA修饰肽 Suc修饰肽 三肽 |
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10.1111/j.1365-294X.2004.02381.x | Impact of oilseed rape expressing the insecticidal serine protease inhibitor, mustard trypsin inhibitor-2 on the beneficial predator Pterostichus madidus | 下载 |
10.1016/j.febslet.2005.08.056 | Differences between human proteinase 3 and neutrophil elastase and their murine homologues are relevant for murine model experiments | 下载 |
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10.1371/journal.pone.0037921 | Identification and characterisation of a novel acylpeptide hydrolase from Sulfolobus solfataricus: structural and functional insights | 下载 |
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10.1016/0003-2697(85)90436-1 | Solid-phase radioimmunoassay for human neutrophil elastase: a sensitive method for determining secreted and cell-associated enzyme | 下载 |
10.1016/0006-2944(74)90134-3 | The synthesis and analytical use of a highly sensitive and convenient substrate of elastase | 下载 |
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多肽Suc-Ala-Ala-Ala-pNA的合成步骤:
1、合成CTC树脂:称取2.98g CTC Resin(如初始取代度约为0.53mmol/g)和1.9mmol Fmoc-Ala-OH于反应器中,加入适量DCM溶解氨基酸(需要注意,此时CTC树脂体积会增大好几倍,避免DCM溶液过少),再加入4.74mmol DIPEA(Mw:129.1,d:0.740g/ml),反应2-3小时后,可不抽滤溶液,直接加入1ml的HPLC级甲醇,封端半小时。依次用DMF洗涤2次,甲醇洗涤1次,DCM洗涤一次,甲醇洗涤一次,DCM洗涤一次,DMF洗涤2次(这里使用甲醇和DCM交替洗涤,是为了更好地去除其他溶质,有利于后续反应)。得到 Fmoc-Ala-CTC Resin。结构图如下:
2、脱Fmoc:加3倍树脂体积的20%Pip/DMF溶液,鼓氮气30分钟,然后2倍树脂体积的DMF 洗涤5次。得到 H2N-Ala-CTC Resin 。(此步骤脱除Fmoc基团,茚三酮检测为蓝色,Pip为哌啶)。结构图如下:
3、缩合:取4.74mmol Fmoc-Ala-OH 氨基酸,加入到上述树脂里,加适当DMF溶解氨基酸,再依次加入9.48mmol DIPEA,4.5mmol HBTU。反应30分钟后,取小样洗涤,茚三酮检测为无色。用2倍树脂体积的DMF 洗涤3次树脂。(洗涤树脂,去掉残留溶剂,为下一步反应做准备)。得到Fmoc-Ala-Ala-CTC Resin。氨基酸:DIPEA:HBTU:树脂=3:6:2.85:1(摩尔比)。结构图如下:
4、依次循环步骤二、步骤三,依次得到
H2N-Ala-Ala-CTC Resin
Fmoc-Ala-Ala-Ala-CTC Resin
以上中间结构,均可在专肽生物多肽计算器-多肽结构计算器中,一键画出。
最后再经过步骤二得到 H2N-Ala-Ala-Ala-CTC Resin,结构如下:
5、丁二酸反应连接:在上述树脂中,加入适当DMF后,再加入4.74mmol丁二酸到树脂中,再加入9.48mmol DIPEA,鼓氮气反应30分钟。用2倍树脂体积的DMF 洗涤3次树脂(洗涤树脂,去掉残留溶剂,为下一步反应做准备)。 得到Suc-Ala-Ala-Ala-CTC Resin。 结构如下:
6、全保护切割:配置0.5%TFA/DCM溶液,溶液体积约为树脂体积的3倍。再次用DCM洗涤树脂2遍(去除残留DMF),后将配置好的溶液倒入到反应器中,反应30分钟。抽滤树脂,收集滤液(此时多肽已经从树脂上分离,存在于滤液中)。多肽序列为 Suc-Ala-Ala-Ala-CTC Resin。 在滤液中添加DIEPA,调PH至7-8。用饱和NaHCO3洗涤滤液,分离出DCM层溶液。可适当旋蒸DCM层溶液,减少有机溶剂。再次加入1或2倍体积的乙酸乙酯,用稀HCl溶液调PH至微酸性,将多肽从DCM层萃取到乙酸乙酯层。用饱和NaCl洗涤2次乙酸乙酯层。用无水硫酸镁吸收乙酸乙酯层的水分。通过减压旋蒸,直接将乙酸乙酯完全旋蒸掉,得到晶体状固体多肽,用于下一步C端反应。或通过减压旋蒸保留适量乙酸乙酯的溶液体积,加入冰乙醚析出 多肽,然后对多肽进行烘干操作即可用于下一步C端反应。Suc-Ala-Ala-Ala-COOH的结构图如下。
7、4-硝基苯胺反应连接:在上述树脂中,加入适当DMF后,再加入4.74mmol 4-硝基苯胺到树脂中,再加入9.48mmol DIPEA、4.5mmol HBTU,鼓氮气反应30分钟。用2倍树脂体积的DMF 洗涤3次树脂(洗涤树脂,去掉残留溶剂,为下一步反应做准备)。 得到 Suc-Ala-Ala-Ala-pNA。 结构如下:
8、切割:6倍树脂体积的切割液(或每1g树脂加8ml左右的切割液),摇床摇晃 2小时,过滤掉树脂,用冰无水乙醚沉淀滤液,并用冰无水乙醚洗涤沉淀物3次,最后将沉淀物放真空干燥釜中,常温干燥24小试,得到粗品Suc-Ala-Ala-Ala-pNA。结构图见产品结构图。
切割液选择:1)TFA:H2O=95%:5%
2)TFA:H2O:TIS=95%:2.5%:2.5%
3)三氟乙酸:茴香硫醚:1,2-乙二硫醇:苯酚:水=87.5%:5%:2.5%:2.5%:2.5%
(前两种适合没有容易氧化的氨基酸,例如Trp、Cys、Met。第三种适合几乎所有的序列。)
9、纯化冻干:使用液相色谱纯化,收集目标峰液体,进行冻干,获得蓬松的粉末状固体多肽。不过这时要取小样复测下纯度 是否目标纯度。
10、最后总结:
杭州专肽生物技术有限公司(ALLPEPTIDE https://www.allpeptide.com)主营定制多肽合成业务,提供各类长肽,短肽,环肽,提供各类修饰肽,如:荧光标记修饰(CY3、CY5、CY5.5、CY7、FAM、FITC、Rhodamine B、TAMRA等),功能基团修饰肽(叠氮、炔基、DBCO、DOTA、NOTA等),同位素标记肽(N15、C13),订书肽(Stapled Peptide),脂肪酸修饰肽(Pal、Myr、Ste),磷酸化修饰肽(P-Ser、P-Thr、P-Tyr),环肽(酰胺键环肽、一对或者多对二硫键环),生物素标记肽,PEG修饰肽,甲基化修饰肽等。
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