Using Cation-π Interactions to Form Heterotrimeric Collagen Helices and Assemble Collagen-Related Peptides
碩士 === 國立清華大學 === 化學系 === 100 === Collagen is an important structural component of tissues in animals. It has an unique right-handed triple helix consisted of three left-handed polyproline II like chains which are composed of X-Y-Gly repeats in the sequence. TypeⅠcollagen, a heterotrimer, is the m...
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ndltd-TW-100NTHU50650722015-10-13T21:22:41Z http://ndltd.ncl.edu.tw/handle/62946110639544354793 Using Cation-π Interactions to Form Heterotrimeric Collagen Helices and Assemble Collagen-Related Peptides 利用 Cation-π 作用力誘導膠原蛋白異源三股螺旋形成及膠原蛋白胜肽自組裝之探討 Kao, Tang-Chun 高堂畯 碩士 國立清華大學 化學系 100 Collagen is an important structural component of tissues in animals. It has an unique right-handed triple helix consisted of three left-handed polyproline II like chains which are composed of X-Y-Gly repeats in the sequence. TypeⅠcollagen, a heterotrimer, is the most abundant form, and thus using heterotrimeric helices can be more appropriate to mimic nature collagen. In this work, we used cation-π interactions to assist collagen-related peptides to fold into heterotrimers. CD and NMR measurements indicate that (POGPRG)3(POG) &; (POGFOG)3(POG), (POGPRG)3(POG) &; (POGFOG)3(POG) &; (POG)7 mixed peptide solution could form a single heterotrimeric helices with Tm values of 26 and 27.5 ºC respectively, and no homotrimers were found. The results demonstrate that heterotrimers could be formed by interchain cation-π interactions. We have previously shown that terminal cation-π interactions can promote RG(POG)10F to rapidly assemble into fibrils. Here we further synthesized (POG)4(PRG)(FOG)(POG)4, (POG)3(PRG)(POG)2(FOG)(POG)3, (POG)2(PRG) (POG)4(FOG)(POG)2, and RG(POG)3(PRG)(POG)2(FOG)(POG)3F to study the position dependent effects of cation-π interactions on their self-assembly process. Turbility and dynamic light scattering measurements showed that such designs and arrangements do not significantly promote the assembly process. The results imply that the PRG and FOG triplets in place of POG in the middle of a collagen related peptide may impose steric effects through the bulky side chains of arginine and phenylalanine residues, which prevent the formation of strong cation-π interactions and retard the packing between collagen triple helices. Horng, Jia-Cherng 洪嘉呈 2012 學位論文 ; thesis 122 zh-TW |
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碩士 === 國立清華大學 === 化學系 === 100 === Collagen is an important structural component of tissues in animals. It has an unique right-handed triple helix consisted of three left-handed polyproline II like chains which are composed of X-Y-Gly repeats in the sequence. TypeⅠcollagen, a heterotrimer, is the most abundant form, and thus using heterotrimeric helices can be more appropriate to mimic nature collagen. In this work, we used cation-π interactions to assist collagen-related peptides to fold into heterotrimers. CD and NMR measurements indicate that (POGPRG)3(POG) &; (POGFOG)3(POG), (POGPRG)3(POG) &; (POGFOG)3(POG) &; (POG)7 mixed peptide solution could form a single heterotrimeric helices with Tm values of 26 and 27.5 ºC respectively, and no homotrimers were found. The results demonstrate that heterotrimers could be formed by interchain cation-π interactions.
We have previously shown that terminal cation-π interactions can promote RG(POG)10F to rapidly assemble into fibrils. Here we further synthesized (POG)4(PRG)(FOG)(POG)4, (POG)3(PRG)(POG)2(FOG)(POG)3, (POG)2(PRG) (POG)4(FOG)(POG)2, and RG(POG)3(PRG)(POG)2(FOG)(POG)3F to study the position dependent effects of cation-π interactions on their self-assembly process. Turbility and dynamic light scattering measurements showed that such designs and arrangements do not significantly promote the assembly process. The results imply that the PRG and FOG triplets in place of POG in the middle of a collagen related peptide may impose steric effects through the bulky side chains of arginine and phenylalanine residues, which prevent the formation of strong cation-π interactions and retard the packing between collagen triple helices.
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author2 |
Horng, Jia-Cherng |
author_facet |
Horng, Jia-Cherng Kao, Tang-Chun 高堂畯 |
author |
Kao, Tang-Chun 高堂畯 |
spellingShingle |
Kao, Tang-Chun 高堂畯 Using Cation-π Interactions to Form Heterotrimeric Collagen Helices and Assemble Collagen-Related Peptides |
author_sort |
Kao, Tang-Chun |
title |
Using Cation-π Interactions to Form Heterotrimeric Collagen Helices and Assemble Collagen-Related Peptides |
title_short |
Using Cation-π Interactions to Form Heterotrimeric Collagen Helices and Assemble Collagen-Related Peptides |
title_full |
Using Cation-π Interactions to Form Heterotrimeric Collagen Helices and Assemble Collagen-Related Peptides |
title_fullStr |
Using Cation-π Interactions to Form Heterotrimeric Collagen Helices and Assemble Collagen-Related Peptides |
title_full_unstemmed |
Using Cation-π Interactions to Form Heterotrimeric Collagen Helices and Assemble Collagen-Related Peptides |
title_sort |
using cation-π interactions to form heterotrimeric collagen helices and assemble collagen-related peptides |
publishDate |
2012 |
url |
http://ndltd.ncl.edu.tw/handle/62946110639544354793 |
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