专肽生物_定制多肽合成服务_多肽合成定制服务_多肽合成厂家_多肽合成公司

HIV Protease Substrate 1 TFA 是一种外源性 HIV 蛋白酶底物，可用于研究 HIV 蛋白酶的酶活性。
HIV Protease Substrate 1 TFA, a fiuorogenic HIV protease substrate, can be used to study enzymatic activity of HIV protease[1].

多肽荧光标记由于没有放射性，实验操作简单。因此，目前在生物学研究中多肽荧光标记应用非常广泛，多肽荧光标记方法与荧光试剂的结构有关系，对于有游离羧基的采用的方法与接多肽反应相同，也采用HBTU/HOBt/DIEA方法连接。 在N端标记FITC的多肽需经历环化作用来形成荧光素，通常会伴有最后一个氨基酸的去除，但当有一个间隔器如氨基己酸，或者是通过非酸性环境将目的多肽从树脂上切下来时，这种情况可避免在切割的过程中被TFA切割掉。
        人们利用利用荧光标记的多肽来检测目标蛋白的活性，并将 其发展的高通量活性筛选方法应用于疾病治疗靶点蛋白的药物筛选和药物开发（例如，各种激 酶、磷酸酶、肽酶等）。
        专肽生物能够提供技术成熟的各种荧光标记多肽。
 

下面是一些常见的多肽修饰荧光物质结构：




FITC标记
 

      FITC(异硫氰酸荧光素)具有比较高的活性，我们公司可以通过两种方式将FITC标记于多肽 上：(1) 将FITC标记于赖氨酸（Lys）或被选择性地脱保护的鸟氨酸（ornithine）侧链氨基 上；(2) 将FITC标记于多肽N端氨基。

      当在N端标记时，建议在最后一个氨基和由异硫氰酸酯与氨基反应产生的硫脲键之间引入 烷基间隔器（alkyl spacer），如氨基己酸（Ahx）。链接切割需要酸性环境，在N端标记FITC 的多肽需经历环化作用来形成荧光素，通常会伴有最后一个氨基酸的去除，但当有一个间隔器 如氨基己酸，或者是通过非酸性环境将目的肽从树脂上切下来时，这种情况可避免。空间位阻 被认为是在荧光染料前使用Ahx的主要原因，而不是为什么FITC不能直接偶联在多肽上的原因。

      Ahx或b-Ala均可作为间隔器用于FITC标记的多肽上。

普通荧光修饰

通过Lys侧链氨基连接的荧光修饰

专肽常做的荧光物质的激发光波长和发射光波长。可供参考选择：
 

Definition
Human immunodeficiency virus (HIV) is a lentivirus that causes acquired immunodeficiency syndrome (AIDS), a condition in humans in which the immune system begins to fail, leading to life-threatening opportunistic infections. Over 5000 HIV-related peptides have been synthesized, that inhibit different stages of viral life cycle.

Discovery
In 1983, two separate researchers Robert Gallo and Luc Montagnier independently declared that a novel retrovirus infecting AIDS patients. Several HIV related peptides including peptides (15-mers or 20-mers) of HIV glycoprotein 160 (gp160), gp120W16D, MN envelope (env) consensus B tat, consensus B VIF, HXB2 gag, SIVmac239, SIVmac239env, SIVmac239 gag have been used to study HIV life cycle. C34 peptide of Gp41 HIV Fragment is known as HR2, belongs to the helical region of gp41 of HIV, C-terminal heptad repeat 2 (HR2) defined as C helix or C peptide. It is known that HIV-1 enters cells by membrane fusion, C34 gp41 peptide is a potent inhibitors of HIV-1 fusion 1,2. The 86 amino acid trans-activator (Tat) protein of human immunodeficiency virus type 1 (HIV-1) is an RNA-binding transcriptional regulator. HIV-1 Tat proteins (wild type and Thr40Lys mutant) and the HIV-1 Tat peptide fragments Tat(32–48) and Tat(32–72) were chemically synthesized and used for HIV studies 3.

HIV (gp120) fragment (254-274), this fragment with sequence homology to a domain of the external envelope glycoprotein (gp120) of the human immunodeficiency virus (HIV) is important for HIV infectivity and antibody neutralization 4. HIV (gp120) fragment (421-438), derived from the CD4 attachment region of HIV gp120, inhibited the syncytial formation in vitro 5. HIV-1 gag protein p17 (76-84), HLA-A*0201-restricted immunodominant CD8 epitope of the HIV gag protein used for the characterization of CD8+ -T cells of HIV-positiv patients 6. HIV-1 rev protein (34-50), this arginine-rich fragment interacts specifically with RNA. It has been shown that rev protein and rev protein (34-50) bind IIB RNA with a similar dissociation constant of approx. 10 nM 7.

Structural Characteristics
The HIV type-1 belongs to the family Retroviridae and consists of two basic components: a core of ribonucleic acid (RNA), called the genome, and a protein component that surrounds the genome, called a capsid. The single-stranded RNA is tightly bound to nucleocapsid proteins and enzymes needed for the morphogenesis of the virion such as reverse transcriptase, proteases, ribonuclease and integrase. A matrix composed of the viral protein that surrounds the capsid. Viral envelope is composed of two layers of fatty molecules taken from the membrane of a human cell during budding process. There are 70 copies of a complex HIV protein that protrudes through the surface of the virus particle, known as Env, consists of a cap, glycoprotein (gp) 120, and a stem, gp41 molecules. This glycoprotein complex is important for fusion of virus to host cell. Both these surface proteins are important targets for treatments or HIV vaccines 8.

Mode of Action
HIV binds to a CD4 receptor and one of two co-receptors on the surface of a CD4+ T- lymphocyte. After fusion, the virus releases RNA, its genetic material, into the host cell. An HIV enzyme called reverse transcriptase converts the single- stranded HIV RNA to double-stranded HIV DNA. The newly formed HIV DNA enters the host cell's nucleus. The integrated HIV DNA is called provirus. The provirus may remain inactive for several years, producing few or no new copies of HIV. When the host cell receives a signal to become active, the provirus uses a host enzyme called RNA polymerase to create copies of the HIV genomic material, as well as shorter strands of RNA called messenger RNA (mRNA). The mRNA is used as a blueprint to make long chains of HIV proteins. An HIV enzyme called protease cuts the long chains of HIV proteins into smaller individual proteins. As the smaller HIV proteins come together with copies of HIV's RNA genetic material, a new virus particle is assembled. The newly assembled virus buds out from the host cell. During budding, the new virus acquires part of the cell's outer envelope. This envelope is embedded with viral glycoproteins which are necessary for host cell recognition.

Functions

CD8 cytotoxic, HIV-1 specific CD8 cytotoxic T lymphocyte (CTL) responses play a critical role in controlling HIV-1 replication. TCR avidity correlates with CTL function, and CTLs expressing TCRs with high avidity for their cognate MHC-viral peptide complex play an important in vivo role in neutralizing virus infections, terminating virus infection and delaying systemic AIDS virus dissemination from the mucosal inoculation site.

HIV-1 envelope transmembrane protein that contain highly positively charged amphipathic helices (designated LLP) in have both cytolytic and calmodulin (CaM) binding/inhibitory properties that contribute to cytopathogenesis during a viral infection.

HIV-1 vif, The human immunodeficiency virus type 1 (HIV-1) auxiliary gene vif is essential for virus propagation in peripheral blood lymphocytes, macrophages, and in some T-cell lines. (i) Vif protein binds HIV-1 PR (protease), but not covalently linked tethered PR-PR; (ii) the four amino acids residing at the N terminus of HIV-1 PR are essential for Vif/PR interaction; (iii) synthetic peptide derived from the N terminus of HIV-1 PR inhibits Vif/PR binding; and (iv) this peptide inhibits the propagation of HIV-1 in restrictive cells 9.

References

1.     Bianchi E, Finotto M, Ingallinella P, Hrin R, Carella AV, Hou XS, Schleif WA, Miller MD, Geleziunas R, Pessi A (2005). Covalent stabilization of coiled coils of the HIV gp41 N region yields extremely potent and broad inhibitors of viral infection. PNAS., 102(36):12903-12908

2.     de Rosny E, Vassell R, Jiang S, Kunert R, Weiss CD (2004). Binding of the 2F5 monoclonal antibody to native and fusion-intermediate forms of human immunodeficiency virus type 1 gp41: implications for fusion-inducing conformational changes. J. Virol., 78(5):2627-2631.
3.     Klostermeier D, Bayer P, Kraft M, Frank RW, Rösch P (1997). Spectroscopic investigations of HIV-1 trans-activator and related peptides in aqueous solutions. Biophysical Chemistry, 63(2):87-96.

4.     Ho DD, Kaplan JC, Rackauskas IE, Gurney ME (1988). Second conserved domain of gp120 is important for HIV infectivity and antibody neutralization. Science, 239(4843):1021-1023.

5.     Morrow WJ, Williams WM, Whalley AS, Ryskamp T, Newman R, Kang CY, Chamat S, Köhler H, Kieber-Emmons T (1992). Synthetic peptides from a conserved region of gp120 induce broadly reactive anti-HIV responses. Immunology, 75(4):557-564.

6.     Wilkinson J, Cope A, Gill J, Bourboulia D, Hayes P, Imami N, Kubo T, Marcelin A, Calvez V, Weiss R, Gazzard B, Boshoff C, Gotch F (2002). Identification of Kaposi's sarcoma-associated herpesvirus (KSHV)-specific cytotoxic T-lymphocyte epitopes and evaluation of reconstitution of KSHV-specific responses in human immunodeficiency virus type 1-Infected patients receiving highly active antiretroviral therapy. J. Virol., 76(6):2634-2640.

7.     Kjems J, Calnan BJ, Frankel AD, Sharp PA (1992). Specific binding of a basic peptide from HIV-1 Rev. EMBO J., 11(3):1119-29.
8.     Chan DC, Fass D, Berger JM, Kim PS (1997). Core structure of gp41 from the HIV   envlope glycoprotein . Cell, 89:263–73.

9.     Hutoran M, Britan E, Baraz L, Blumenzweig I, Steinitz M, Kotler M (2004). Abrogation of Vif function by peptide derived from the N-terminal region of the human immunodeficiency virus type 1 (HIV-1) protease. Virology, 330(1):261-270.

Kapewangolo P, et al. Anti-HIV Activity of Ocimum labiatum Extract and Isolated Pheophytin-a. Molecules. 2017;22(11):1763. Published 2017 Nov 6. : https://pubmed.ncbi.nlm.nih.gov/29113139/

多肽H2N-Arg-Glu(Edans)-Ser-Gln-Asn-Tyr-Pro-Ile-Val-Gln-Lys(Dabcyl)-Arg-COOH的合成步骤：

1、合成CTC树脂：称取1.47g CTC Resin（如初始取代度约为0.32mmol/g）和0.56mmol Fmoc-Arg(Pbf)-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1.41mmol 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-Arg(Pbf)-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-Arg(Pbf)-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1.41mmol Fmoc-Lys(Dabcyl)-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2.82mmol DIPEA，1.34mmol 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-Lys(Dabcyl)-Arg(Pbf)-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-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

H2N-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

H2N-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

H2N-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

H2N-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

H2N-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

H2N-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Gln(Trt)-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

H2N-Gln(Trt)-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Ser(tBu)-Gln(Trt)-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

H2N-Ser(tBu)-Gln(Trt)-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Glu(Edans)-Ser(tBu)-Gln(Trt)-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

H2N-Glu(Edans)-Ser(tBu)-Gln(Trt)-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-CTC Resin

Fmoc-Arg(Pbf)-Glu(Edans)-Ser(tBu)-Gln(Trt)-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-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-Arg(Pbf)-Glu(Edans)-Ser(tBu)-Gln(Trt)-Asn(Trt)-Tyr(tBu)-Pro-Ile-Val-Gln(Trt)-Lys(Dabcyl)-Arg(Pbf)-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-Arg-Glu(Edans)-Ser-Gln-Asn-Tyr-Pro-Ile-Val-Gln-Lys(Dabcyl)-Arg-COOH。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。）

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，甲基化修饰肽等。

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