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Energy profile of maltooligosaccharide permeation through maltoporin as derived from the structure and from a statistical analysis of saccharide-protein interactions.

机译:麦芽寡糖渗透通过麦芽酚蛋白的能量特征,其结构和糖-蛋白质相互作用的统计分析得出。

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摘要

The crystal structure of the maltodextrin-specific porin from Salmonella typhimurium ligated with a maltotrioside at the pore eyelet is known at 2.4 A resolution. The three glucose units assume a conformation close to the natural amylose helix. The pore eyelet fits exactly the cross-section of a maltooligosaccharide chain and thus functions as a constraining orifice. The oligomer permeates the membrane by screwing along the amylose helix through this orifice. Because each glucose glides along the given helix, its interactions can be sampled at any point along the pathway. The interactions are mostly hydrogen bonds, but also contacts to aromatic rings at one side of the pore. We have derived the energy profile of a gliding maltooligosaccharide by following formation and breakage of hydrogen bonds and by assessing the saccharide-aromatics interactions from a statistical analysis of saccharide binding sites in proteins. The resulting profile indicates smooth permeation despite extensive hydrogen bonding at the orifice.
机译:在孔眼处与麦芽三糖苷连接的鼠伤寒沙门氏菌的麦芽糖糊精特异性孔蛋白的晶体结构是已知的。这三个葡萄糖单元具有接近天然直链淀粉螺旋的构象。孔眼恰好与麦芽低聚糖链的横截面相吻合,因此可作为约束孔。通过沿着直链淀粉螺旋穿过该孔口,低聚物渗透膜。由于每个葡萄糖都沿着给定的螺旋滑动,因此可以在路径的任何点采样其相互作用。相互作用主要是氢键,但也与孔一侧的芳环接触。我们通过跟踪氢键的形成和断裂,并通过对蛋白质中糖结合位点的统计分析评估糖-芳香族相互作用,得出了滑质低聚麦芽低聚糖的能量分布。尽管在孔口处有广泛的氢键结合,但所得的轮廓表明其渗透通畅。

著录项

  • 作者

    Meyer, J. E.; Schulz, G. E.;

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  • 年度 1997
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  • 原文格式 PDF
  • 正文语种 en
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