Crystallographic analysis of human serum albumin complexed with 4Z,15E-bilirubin-IXalpha.

Crystallographic analysis of human serum albumin complexed with 4Z,15E-bilirubin-IXalpha.
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DOI:
10.1016/j.jmb.2008.06.016
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发表时间:
2008-08-29
影响因子:
5.6
通讯作者:
Curry, Stephen
Curry, Stephen
中科院分区:
生物学2区
文献类型:
--
作者:
Zunszain, Patricia A.;Ghuman, Jamie;McDonagh, Antony F.;Curry, Stephen

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胆红素是一种来自血红素分解代谢的不溶性黄色橙色色素,在患有受损或未成熟肝功能的个体中积累了毒性水平。异构体,例如4z,15e-二利纤维蛋白。我们的相互作用是我们与HSA共结合的,晶体结构(确定为2.42Å),将4Z,15e-bilirubin-ixα异构体绑定到与L形袖子中的15e-bilirubin-ixα异构体。 HSA的共晶体结构与熔融酸复合,一种竞争性地从蛋白质中取代胆红素的抗生素,表明其结合了同一口袋。关于HSA-二脂蛋白相互作用的当前概念,并提供了一个合理的结构框架,以最终解决长期存在的问题,即4z,15z-二氟氨基蛋白IXα与蛋白质结合。
Bilirubin, an insoluble yellow-orange pigment derived from heme catabolism, accumulates to toxic levels in individuals with impaired or immature liver function. The resulting jaundice may be managed with phototherapy to isomerize the biosynthetic 4Z,15Z-bilirubin-IXα to more soluble and excretable isomers, such as 4Z,15E-bilirubin. Bilirubin and its configurational isomers are transported to the liver by human serum albumin (HSA) but their precise binding location(s) on the protein have yet to be determined. To investigate the molecular details of their interaction, we co-crystallised bilirubin with HSA. Strikingly, the crystal structure—determined to 2.42 Å resolution—revealed the 4Z,15E-bilirubin-IXα isomer bound to an L-shaped pocket in sub-domain IB. We also determined the co-crystal structure of HSA complexed with fusidic acid, an antibiotic that competitively displaces bilirubin from the protein, and showed that it binds to the same pocket. These results provide the first crystal structure of a natural bilirubin pigment bound to serum albumin, challenge some of the present conceptions about HSA–bilirubin interactions, and provide a sound structural framework for finally resolving the long-standing question of where 4Z,15Z-bilirubin-IXα binds to the protein.
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