乱序肽 (Phe¹,Ser²)-TRAP-6 (FSLLRN) 可作为 TRAP-6、SFLLRN 的非活性对照。
编号：200390
CAS号：374898-11-0
单字母：H2N-FSLLRN-OH
| 编号: | 200390 |
| 中文名称: | 六肽(Phe¹,Ser²)-TRAP-6 |
| CAS号: | 374898-11-0 |
| 单字母: | H2N-FSLLRN-OH |
| 三字母: | H2N N端氨基：N-terminal amino group。在肽或多肽链中含有游离a-氨基的氨基酸一端。在表示氨基酸序列时，通常将N端放在肽链的左边。 -PheL-苯丙氨酸：phenylalanine。系统命名为(2S)-氨基-3-苯基丙酸。是编码氨基酸。是哺乳动物的必需氨基酸。符号：F，Phe。 -SerL-丝氨酸：serine。系统命名为(2S)-氨基-3-羟基丙酸。是编码氨基酸。因可从蚕丝中获得而得名。符号：S，Ser。在丝原蛋白及某些抗菌素中含有 D-丝氨酸。 -LeuL-亮氨酸：leucine。系统命名为(2S)-氨基-4-甲基戊酸。是编码氨基酸。是哺乳动物的必需氨基酸。符号：L，Leu。 -LeuL-亮氨酸：leucine。系统命名为(2S)-氨基-4-甲基戊酸。是编码氨基酸。是哺乳动物的必需氨基酸。符号：L，Leu。 -ArgL-精氨酸：arginine。系统命名为(2S)-氨基-5-胍基戊酸。在生理条件下带正电荷，为编码氨基酸。是幼小哺乳动物的必需氨基酸。符号：R，Arg。 -Asn天冬酰胺：asparagine。L-天冬酰胺的系统命名为(2S)-氨基-3-氨酰基丙酸，是编码氨基酸。符号：N，Asn。D-天冬酰胺存在于短杆菌肽A分子中。 -OHC端羧基：C-terminal carboxyl group。在肽或多肽链中含有游离羧基的氨基酸一端。在表示氨基酸序列时，通常将C端放在肽链的右边。 |
| 氨基酸个数: | 6 |
| 分子式: | C34H56N10O9 |
| 平均分子量: | 748.87 |
| 精确分子量: | 748.42 |
| 等电点(PI): | - |
| pH=7.0时的净电荷数: | 1.97 |
| 平均亲水性: | -0.43333333333333 |
| 疏水性值: | 0.27 |
| 消光系数: | - |
| 来源: | 人工化学合成，仅限科学研究使用，不得用于人体。 |
| 储存条件: | 负80℃至负20℃ |
| 标签: | 血液学 |
The scrambled peptide (Phe¹,Ser²)-TRAP-6 (FSLLRN) may serve as an inactive control for TRAP-6, SFLLRN.
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多肽H2N-Phe-Ser-Leu-Leu-Arg-Asn-COOH的合成步骤：
1、合成CTC树脂：称取1.83g CTC Resin（如初始取代度约为0.94mmol/g）和2.06mmol Fmoc-Asn(Trt)-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5.16mmol 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-Asn(Trt)-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-Asn(Trt)-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5.16mmol Fmoc-Arg(Pbf)-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10.32mmol DIPEA，4.9mmol 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-Arg(Pbf)-Asn(Trt)-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-Arg(Pbf)-Asn(Trt)-CTC Resin
Fmoc-Leu-Arg(Pbf)-Asn(Trt)-CTC Resin
H2N-Leu-Arg(Pbf)-Asn(Trt)-CTC Resin
Fmoc-Leu-Leu-Arg(Pbf)-Asn(Trt)-CTC Resin
H2N-Leu-Leu-Arg(Pbf)-Asn(Trt)-CTC Resin
Fmoc-Ser(tBu)-Leu-Leu-Arg(Pbf)-Asn(Trt)-CTC Resin
H2N-Ser(tBu)-Leu-Leu-Arg(Pbf)-Asn(Trt)-CTC Resin
Fmoc-Phe-Ser(tBu)-Leu-Leu-Arg(Pbf)-Asn(Trt)-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-Phe-Ser(tBu)-Leu-Leu-Arg(Pbf)-Asn(Trt)-CTC Resin，结构如下：
5、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H2N-Phe-Ser-Leu-Leu-Arg-Asn-COOH。结构图见产品结构图。
切割液选择：1）TFA：H2O=95%：5%、TFA：H2O=97.5%：2.5%
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。）
6、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。
7、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
以上所有内容，为专肽生物原创内容，请勿发布到其他网站上。
