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• W2084093926 abstract "Antithrombin is activated as an inhibitor of the coagulation proteases through its specific interaction with a heparin pentasaccharide. The binding of heparin induces a global conformational change in antithrombin which results in the freeing of its reactive center loop for interaction with target proteases and a 1000-fold increase in heparin affinity. The allosteric mechanism by which the properties of antithrombin are altered by its interactions with the specific pentasaccharide sequence of heparin is of great interest to the medical and protein biochemistry communities. Heparin binding has previously been characterized as a two-step, three-state mechanism where, after an initial weak interaction, antithrombin undergoes a conformational change to its high-affinity state. Although the native and heparin-activated states have been determined through protein crystallography, the number and magnitude of conformational changes render problematic the task of determining which account for the improved heparin affinity and how the heparin binding region is linked to the expulsion of the reactive center loop. Here we present the structure of an intermediate pentasaccharide-bound conformation of antithrombin which has undergone all of the conformational changes associated with activation except loop expulsion and helix D elongation. We conclude that the basis of the high-affinity state is not improved interaction with the pentasaccharide but a lowering of the global free energy due to conformational changes elsewhere in antithrombin. We suggest a mechanism in which the role of helix D elongation is to lock antithrombin in the five-stranded fully activated conformation." @default.
• W2084093926 created "2016-06-24" @default.
• W2084093926 creator A5047843194 @default.
• W2084093926 creator A5064539559 @default.
• W2084093926 date "2003-07-01" @default.
• W2084093926 modified "2023-09-27" @default.
• W2084093926 title "Crystal Structure of Antithrombin in a Heparin-Bound Intermediate State^," @default.
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• W2084093926 doi "https://doi.org/10.1021/bi034524y" @default.
• W2084093926 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12873131" @default.
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