AN AMYLOSE ANTIPARALLEL DOUBLE HELIX AT ATOMIC RESOLUTION

AN AMYLOSE ANTIPARALLEL DOUBLE HELIX AT ATOMIC RESOLUTION
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DOI:
10.1126/science.238.4824.205
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发表时间:
1987-10-09
期刊:
影响因子:
56.9
通讯作者:
SAENGER, W
SAENGER, W
中科院分区:
综合性期刊1区
文献类型:
--
作者:
HINRICHS, W;BUTTNER, G;SAENGER, W

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在多碘化物络合物(对硝基苯基-α-苯基)的晶体结构中,麦芽六糖2). Ba(I3)2. 22 H2O时,麦芽六糖单元与O-2形成反平行的左手双螺旋。cntdot.. cntdot. O-3和O-6。cntdot.. cntdot. O-6氢键和包围两个三碘单元的中心空腔。这种结构与为A-和B-淀粉螺旋和V-直链淀粉中的左手单螺旋提出的没有中心腔的平行左手双螺旋形成对比,并且可能与糖原结构的稳定有关。
In the crystal structure of the polyiodide complex (p-nitrophenyl-.alpha.-maltohexaose2) .cntdot. Ba(I3)2 .cntdot. 22H2O, the maltohexaose units form an antiparallel, left-handed double helix with O-2 .cntdot..cntdot..cntdot. O-3 and O-6 .cntdot..cntdot..cntdot. O-6 hydrogen bonding and a central cavity that encloses two triiodide units. This structure contrasts with the parallel, left-handed double helix with no central cavity proposed for the A- and B-starch helix and the left-handed single helix in V-amylose and may be relevant for the stabilization of glycogen structure.