Click Peptide點擊多肽合成服務

疏水性多肽不僅制備過程非常耗時,而且即使在成功合成后,由于其難溶等特性,也很可能導致在篩選等實驗操作時再次遇到障礙,嚴重影響實驗的進程。典型的疏水肽如β-amyloid,它是阿爾茨海默?。ˋlzheimer's disease)治療研究的有效靶點之一,但由于其不可調控及易聚集的特性,使研究進程常常無法順利進行。金斯瑞專業的"Click Peptide"多肽合成服務(SC1497),可幫助客戶有效解決疏水性肽的難溶及聚集問題。
關鍵特征:
改變疏水性肽的特征:
- 物理化學性質(如:水溶性,聚集,自組裝,或折疊)
- 生物學活性(如:配體-受體親和力,或酶-底物親和力)
簡單操作即可實現轉變:
- 合成的"click peptide"在pH值等于或高于7.4的條件下,能輕易轉變成您需要的疏水性多肽
- 單向轉化,反應過程迅速
- 轉化過程無副產物,適用于生物學實驗
- 有效增加疏水性多肽的溶解度,滿足您的實驗需求
- 顯著降低疏水性肽的聚集反應
- 為AD實驗中研究β-amyloid(1-42)的生物學功能研究,提供了新的方法
- 適用于細胞信號轉導及其它研究
- Atsuhiko Taniguchi, Youhei Sohma, et al. Click peptide: Chemical Biology-oriented analogues of Alzheimer's amyloid β peptide 1–42. J. Peptide Science. Nov 2006; 12(12): 823-828
- Youhei Sohma, Atsuhiko Taniguchi, et al. Controlled Production of Amyloid β Peptide from a Photo-Triggered, Water-Soluble Precursor "Click Peptide". ChemBioChem. Nov 2008; 9(18): 3055-3065
- Hui Wang, Taeko Kakizawa, et al. Synthesis of amyloid β peptide 1–42 (E22Δ) click peptide: pH-triggered in situ production of its native form. Bioorganic & Medicinal Chemistry. July 2009; 17(14): 4881-4887
主要優勢:
參考文獻:
"click peptide"是指化學修飾后的多肽前體,它常常被用于研究多肽的生物學功能。我們在目的多肽的骨架上進行了化學修飾,構建多肽前體,且該前體不具備目的肽固有的生物學活性,當您收到多肽產品后,只需通過簡單的操作如改變pH值,就能將前體肽原位轉化為目的多肽,無副產物產生。該反應速度快,操作簡單,且轉化過程不可逆。
我們的click peptide服務參考了Atsuhiko Taniguchi等科學家研發的O-?;姆椒ǎ∣-acyl isopeptide method,圖一)。多肽鏈間的氫鍵作用力可維持高級結構的構象穩定,從而在物理化學性質及生物學功能中起著至關重要的作用。在pH值為7.4或更高的條件下,前體肽鏈中發生原子經濟性反應(atom-economical reaction),通過O→N分子內?;D移,迅速形成酰胺鍵。由于前體肽在轉化過程中無副產品釋放,因此在毒理學研究試驗中將占很大的優勢。

click peptide的轉化反應
參考文獻
Atsuhiko Taniguchi, Youhei Sohma, et al. Click peptide: Chemical Biology-oriented analogues of Alzheimer's amyloid β peptide 1–42. J. Peptide Science. Nov 2006; 12(12): 823-828
26-O-acyl β-amyloid (1-42) click peptide was successfully synthesized, the β-ester bond in which can be quickly and quantitatively converted to a native Gly25-Ser26 amide bond via a pH-dependent O-N intramolecular acyl migration reaction (t1/2 =1 min, pH 7.4, 37℃) at a hydroxyamino acid residue. Namely, upon this pH-triggered conversion (pH-click), the non-aggregative and water-soluble precursor (click peptide) can produce the monomer with a random-coil structure under physiological conditions (pH 7.4, 37℃). The structure information is as follows.

Scheme 2: β-amyloid (1-42) click peptide Result
Result
- β-amyloid precursor(click peptide) has a water solubility of 15 mg/ml, while it is only 0.14 mg/ml for the native peptide.
- The aggregative property of the peptides reduced significantly.
- The O-acyl moiety was stable under acidic pH.
The following are HPLC reports of (Scheme 3) purified β-amyloid (1-42) native peptide converted from β-amyloid (1-42) click peptide (precursor) and (Scheme 4) purified 26-O-acyl β-amyloid (1-42) click peptide (precursor).

Scheme 3: HPLC report of purified β-amyloid (1-42) native peptide converted from β-amyloid (1-42) click peptide (precursor)

Scheme 4: HPLC report of purified 26-O-acyl β-amyloid (1-42) click peptide (precursor)