首页> 外文期刊>Journal of Molecular Biology >Crystallographic analysis of human serum albumin complexed with 4Z,15E-bilirubin-IXalpha.
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Crystallographic analysis of human serum albumin complexed with 4Z,15E-bilirubin-IXalpha.

机译:人体血清白蛋白与4Z,15E-胆红素-IXalpha复合的晶体学分析。

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摘要

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-IXalpha 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 A resolution--revealed the 4Z,15E-bilirubin-IXalpha 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-IXalpha binds to the protein.
机译:胆红素是一种源自血红素分解代谢的不溶性橙黄色色素,会在肝功能受损或未成熟的个体中累积至毒性水平。产生的黄疸可以通过光疗进行处理,以将生物合成的4Z,15Z-胆红素-IXalpha异构化为更易溶和可分泌的异构体,例如4Z,15E-胆红素。胆红素及其构型异构体通过人血清白蛋白(HSA)转运至肝脏,但它们在蛋白质上的精确结合位置尚待确定。为了研究它们相互作用的分子细节,我们将胆红素与HSA共结晶。令人惊讶的是,晶体结构(确定为2.42 A分辨率)揭示了与Z型子域IB中的L形口袋结合的4Z,15E-胆红素-IXalpha异构体。我们还确定了与夫西地酸复合的HSA的共晶体结构,夫西地酸是一种竞争性地从蛋白质中置换胆红素的抗生素,并表明它与同一口袋结合。这些结果提供了与血清白蛋白结合的天然胆红素色素的第一个晶体结构,挑战了目前有关HSA-胆红素相互作用的一些概念,并为最终解决长期存在的4Z,15Z-胆红素问题提供了合理的结构框架。 -IXalpha与蛋白质结合。

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