National Taiwan Ocean University Institutional Repository:Item 987654321/39362
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题名: Insights into the binding specificity and catalytic mechanism of N-acetylhexosamine 1-phosphate kinases through multiple reaction complexes
作者: Kuei-Chen Wang
Syue-Yi Lyu
Yu Chen Liu
Chinyuan Chang
Chang Jer Wu
Tsung-Lin Li
贡献者: 國立臺灣海洋大學:食品科學系
关键词: multiple reaction complexes
N-acetylhexosamine 1-phosphate kinase
bifidobacteria
日期: 2014-05
上传时间: 2016-12-07T06:17:17Z
出版者: Acta Crystallographica Section D Biological Crystallography
摘要: Abstract: Utilization of N-acetylhexosamine in bifidobacteria requires the specific lacto-N-biose/galacto-N-biose pathway, a pathway differing from the Leloir pathway while establishing symbiosis between humans and bifidobacteria. The gene lnpB in the pathway encodes a novel hexosamine kinase NahK, which catalyzes the formation of N-acetylhexosamine 1-phosphate (GlcNAc-1P/GalNAc-1P). In this report, seven three-dimensional structures of NahK in complex with GlcNAc, GalNAc, GlcNAc-1P, GlcNAc/AMPPNP and GlcNAc-1P/ADP from both Bifidobacterium longum (JCM1217) and B. infantis (ATCC15697) were solved at resolutions of 1.5-2.2 Å. NahK is a monomer in solution, and its polypeptide folds in a crescent-like architecture subdivided into two domains by a deep cleft. The NahK structures presented here represent the first multiple reaction complexes of the enzyme. This structural information reveals the molecular basis for the recognition of the given substrates and products, GlcNAc/GalNAc, GlcNAc-1P/GalNAc-1P, ATP/ADP and Mg(2+), and provides insights into the catalytic mechanism, enabling NahK and mutants thereof to form a choice of biocatalysts for enzymatic and chemoenzymatic synthesis of carbohydrates.
關聯: 70(Pt 5)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39362
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