螢光聚胜肽之特殊作用力:聚集增強放光及組態轉換

施克穎

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螢光聚胜肽之特殊作用力:聚集增強放光及組態轉換

Specific interaction in fluorescent polypeptide: aggregation-enhanced emission and conformational transformation

施克穎 , Masters　　Advisor：洪金龍　　

英文

聚集發光增強；螢光；二級結構；聚集誘導放光；開環聚合反應；氫鍵作用力；螺旋-to-不規則；組態轉變；水溶性聚胜肽；四苯基噻吩； water-soluble polypeptide ； ring opening polymerization ； conformational transformation ； helix-to-coil ； Aggregation-enhanced emission ； fluorescence ； aggregation-induced emission ； tetraphenylthiophenen ； hydrogen-bond interaction ； secondary structure

Abstract │ Reference (104) │ Altmetrics

Abstract 〈TOP〉

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Abstract-1
New pyridine-terminated fluorophore of 4-[2-(9-Anthryl)vinyl]pyridine (AnPy) with intramolecular charge transfer (ICT) and aggregation-induced emission (AIE) properties was synthesized and was blended with different amounts of polytyrosine (PTyr) through preferable hydrogen-bond (H-bond) interactions. In blends of low AnPy content, the rigid PTyr peptide chains serve as templates to H-bond to AnPys, imposing rotational restriction and reinforcing the AIE-related emission intensity of AnPys, resulting in amorphous blends with the observed glass transitions dependent on the composition of the blends. In contrast, when large amounts of AnPys were added, excess AnPys will form new crystals, in between the amorphous regions, constituted by the near parallel dimers of AnPys. With the hampered molecular rotation, the parallel dimers of AnPys in the highly AnPy-loaded blends emit strongly with intensity much higher than those for the amorphous blends. In this study, conformation of the blends and degree of restricted molecular rotation were assessed in order to correlate with the AIE-related fluorescence behaviour.

Abstract-2
Tetraphenylthiophene (TP) with aggregation-enhanced emission (AEE) property was used as terminal fluorophore of the water-soluble poly(γ-propargyl-L-glutamate) (PPLG)-based polymers of TP-iPPLGs to probe the relationship between the secondary structure (α-helix) of polypeptides and the AEE-related emission behavior. Intermolecular aggregation of the terminal TP unit in TP-iPPLG is sterically blocked by the large α-helical PPLG chains, leading to the weak AEE-related fluorescence in water. In contrast, the intermolecular approach between the terminal TP units of TP-iPPLG is accessible if TP was connected by peptide chin in random coil structure. Therefore, helix-to-coil transition induced in the alkaline aqueous solution successfully enhances the emission intensity of the TP-iPPLG solution. The pH-induced conformation change in relationship to the AEE-related emission behavior is therefore evaluated in this study.

Reference ( 104 ) 〈TOP〉

Chapter 1
連結：
(1) Bae, Y.; Fukushima, S.; Harada, A.; Kataoka, K. Angew. Chem., Int. Ed. 2003, 42, 4640.
連結：
(2) Klok, H. A.; Lecommandoux, S. Adv. Mater. 2001, 13, 1217.
連結：
(3) Tang, H.; Zhang, D. J. Polym. Sci., Part A: Polym. Chem. 2010, 48, 2340.
連結：
(4) Habraken, G. J. M.; Koning, C. E.; Heise, A. J. Polym. Sci., Part A: Polym. Chem. 2009, 47, 6883.
連結：

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