Structural and Functional Studies of Phosphopantetheine aenylyltransferase from Helicobacter pylori
碩士 === 國立清華大學 === 生物資訊與結構生物研究所 === 97 === Coenzyme A (CoA) is the principle acyl carrier in all living cells, and is required for many metabolic reactions, including citric acid cycle and fatty acid metabolism. Phosphopantetheine adenylyltransferase (PPAT; EC: 2.7.7.3) is an essential enzyme that c...
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ndltd-TW-097NTHU51120162015-11-13T04:08:48Z http://ndltd.ncl.edu.tw/handle/21152509756929698299 Structural and Functional Studies of Phosphopantetheine aenylyltransferase from Helicobacter pylori 幽門螺旋桿菌磷酸泛酸醯基乙胺腺苷轉移酶結構與功能之研究 Chen, Chih-Hao 陳志豪 碩士 國立清華大學 生物資訊與結構生物研究所 97 Coenzyme A (CoA) is the principle acyl carrier in all living cells, and is required for many metabolic reactions, including citric acid cycle and fatty acid metabolism. Phosphopantetheine adenylyltransferase (PPAT; EC: 2.7.7.3) is an essential enzyme that catalyzes the penultimate step of CoA biosynthesis by transferring an adenylyl group from ATP to 4’-phosphopantetheine (Ppant), yielding 3’-dephospho-CoA (dPCoA) and pyrophosphate. PPAT catalyzes the second rate-limiting step in CoA synthetic pathway and is regulated by feedback inhibition by downstream end product, CoA. The bacteria PPAT sequences show high degree of homology but are dissimilar from mammalian, therefore, this enzyme might be a good antibacterial target. PPAT from Helicobacter pylori (H. pylori) which infects about 50% world population and cause gastric and duodenal ulcers was expressed and crystallized in space group I222. The crystal structure of H. pylori PPAT has been determined by molecular replacement method at 1.75 Å resolution. The structure shows an open form of H. pylori PPAT that have not been observed in other PPATs. Since previous reports have shown that PPAT from Escherichia coli exhibites pH-dependent binding affinity towards substrates, the PPAT structural stability and activity was studied by circular dichroism and isothermal titration calorimetry. Yin, Hsien-Sheng 殷献生 2009 學位論文 ; thesis 47 en_US |
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碩士 === 國立清華大學 === 生物資訊與結構生物研究所 === 97 === Coenzyme A (CoA) is the principle acyl carrier in all living cells, and is required for many metabolic reactions, including citric acid cycle and fatty acid metabolism. Phosphopantetheine adenylyltransferase (PPAT; EC: 2.7.7.3) is an essential enzyme that catalyzes the penultimate step of CoA biosynthesis by transferring an adenylyl group from ATP to 4’-phosphopantetheine (Ppant), yielding 3’-dephospho-CoA (dPCoA) and pyrophosphate. PPAT catalyzes the second rate-limiting step in CoA synthetic pathway and is regulated by feedback inhibition by downstream end product, CoA. The bacteria PPAT sequences show high degree of homology but are dissimilar from mammalian, therefore, this enzyme might be a good antibacterial target. PPAT from Helicobacter pylori (H. pylori) which infects about 50% world population and cause gastric and duodenal ulcers was expressed and crystallized in space group I222. The crystal structure of H. pylori PPAT has been determined by molecular replacement method at 1.75 Å resolution. The structure shows an open form of H. pylori PPAT that have not been observed in other PPATs. Since previous reports have shown that PPAT from Escherichia coli exhibites pH-dependent binding affinity towards substrates, the PPAT structural stability and activity was studied by circular dichroism and isothermal titration calorimetry.
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author2 |
Yin, Hsien-Sheng |
author_facet |
Yin, Hsien-Sheng Chen, Chih-Hao 陳志豪 |
author |
Chen, Chih-Hao 陳志豪 |
spellingShingle |
Chen, Chih-Hao 陳志豪 Structural and Functional Studies of Phosphopantetheine aenylyltransferase from Helicobacter pylori |
author_sort |
Chen, Chih-Hao |
title |
Structural and Functional Studies of Phosphopantetheine aenylyltransferase from Helicobacter pylori |
title_short |
Structural and Functional Studies of Phosphopantetheine aenylyltransferase from Helicobacter pylori |
title_full |
Structural and Functional Studies of Phosphopantetheine aenylyltransferase from Helicobacter pylori |
title_fullStr |
Structural and Functional Studies of Phosphopantetheine aenylyltransferase from Helicobacter pylori |
title_full_unstemmed |
Structural and Functional Studies of Phosphopantetheine aenylyltransferase from Helicobacter pylori |
title_sort |
structural and functional studies of phosphopantetheine aenylyltransferase from helicobacter pylori |
publishDate |
2009 |
url |
http://ndltd.ncl.edu.tw/handle/21152509756929698299 |
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