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Electrochemical and functional studi...
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Das, Aditi.
Electrochemical and functional studies of de novo alpha helical proteins from a designed combinatorial library.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Electrochemical and functional studies of de novo alpha helical proteins from a designed combinatorial library.
作者:
Das, Aditi.
面頁冊數:
199 p.
附註:
Adviser: Michael H. Hecht.
附註:
Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4202.
Contained By:
Dissertation Abstracts International66-08B.
標題:
Chemistry, Biochemistry.
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3188622
ISBN:
9780542306945
Electrochemical and functional studies of de novo alpha helical proteins from a designed combinatorial library.
Das, Aditi.
Electrochemical and functional studies of de novo alpha helical proteins from a designed combinatorial library.
- 199 p.
Adviser: Michael H. Hecht.
Thesis (Ph.D.)--Princeton University, 2005.
Combinatorial libraries of designed proteins facilitate the exploration of structures and functions of proteins which are unbiased by explicit rational design or natural evolution. This thesis examines functional and electrochemical properties of de novo designed alpha helical proteins from one such combinatorial library of 'binary patterned' proteins. The studies initiated in this thesis lay the foundation for the development of biosensors based on 'binary patterned' de novo proteins.
ISBN: 9780542306945Subjects--Topical Terms:
226900
Chemistry, Biochemistry.
Electrochemical and functional studies of de novo alpha helical proteins from a designed combinatorial library.
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Combinatorial libraries of designed proteins facilitate the exploration of structures and functions of proteins which are unbiased by explicit rational design or natural evolution. This thesis examines functional and electrochemical properties of de novo designed alpha helical proteins from one such combinatorial library of 'binary patterned' proteins. The studies initiated in this thesis lay the foundation for the development of biosensors based on 'binary patterned' de novo proteins.
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First, a four-helix bundle protein, S-824-C, was immobilized onto a gold electrode using organic linkers. The electrochemical response of heme-bound S-824-C to added N-donor ligands indicated that the protein scaffold modulates the binding of N-donor ligands to the buried heme in heme/S824C.
520
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In a separate study, the phenylalanine residues in protein S-824 were mutated to create a site for binding small molecules and the presence of binding site was confirmed using computational analysis. Further, the protein S-824 and its mutant F64A were screened for binding to small molecules using saturation transfer difference (STD) NMR. Finally, the binding constants were determined using pulse field gradient spin echo (PFGSE) NMR experiments. This study showed that the F64A mutation in protein S-824 leads to the creation of a cavity that can bind small molecules specifically with high affinity.
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Second, de novo protein S-824-C was nanopatterned onto a gold surface in order to demonstrate the viability of preparing nanometer scale protein arrays.
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The proteins were immobilized onto gold surface using different strategies and were subjected to electrochemical and functional interrogation.
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Third, the 'binary patterned' de novo proteins were immobilized by exploiting the affinity between heme and the proteins and the suitability of the proteins was evaluated for developing hydrogen peroxide sensors. One of the proteins (n86) was shown to have half the activity of a horseradish peroxidase protein when both are immobilized. Further, it was observed that de novo proteins with less compact apo state showed better peroxidase activity in their heme bound form than proteins with more compact apo structure.
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