摘要
在哺乳动物中,血红素族的分解代谢对于生命是必不可少的。血红素首先被血红素加氧酶(HO)裂解为线性四吡咯BiliverdinIXα(BV),然后BIV被Biliverdin Reductase(BVR)转化为胆红素。 HO利用NADPH-细胞色素P450氧化还原酶(CPR)提供的三个氧分子(O2)和七个电子来打开血红素环,BVR通过使用NAD(P)H降低BV。 HOs的结构研究,包括底物结合,反应中间物结合和几种特定抑制剂结合形式,揭示了解释底物与HO结合以及特异HO反应进程潜在机制的细节。低温捕获的结构和时间分辨光谱研究检查了远端配体与血红素铁之间的键的光解,证明了HO反应过程中产生的CO如何从反应部位解离,并伴随HO的相应构象变化。包含HO和CPR的复合物结构提供了电子如何转移到血红素-HO复合物中的详细信息。尽管BVR的三级结构及其与NAD +的复合物已经确定了10多年以上,但BVR的催化残基和反应机理仍然未知。最近的晶体学研究,研究了蓝藻BVR与NADP +和底物BV的复合物,为这些问题提供了一些说明。两个BV分子以堆叠的方式结合到BVR,一个BV可以协助另一个BV的还原催化。在这篇综述中,通过生化,光谱学和晶体学研究说明了最近的进展,这些进展详细说明了HO和BVR反应的分子机理的化学基础。
关键词: X射线晶体学,蛋白质结构,氧化还原络合物,血红素代谢,酶促反应,配体识别,堆积的底物结合模式。
[http://dx.doi.org/10.1073/pnas.61.2.748] [PMID: 4386763]
[PMID: 4390967]
[http://dx.doi.org/10.1023/A:1015957026924] [PMID: 12162441]
[http://dx.doi.org/10.1073/pnas.1119658109] [PMID: 22232681]
[http://dx.doi.org/10.1002/hep.22604] [PMID: 19085910]
[http://dx.doi.org/10.1126/science.1078456] [PMID: 12446832]
[http://dx.doi.org/10.1042/bst0300604] [PMID: 12196146]
[http://dx.doi.org/10.1074/jbc.M311550200] [PMID: 14615478]
[PMID: 15345142]
[PMID: 827230]
[http://dx.doi.org/10.1007/BF00225252] [PMID: 6353193]
[http://dx.doi.org/10.1016/j.bbrc.2005.08.020] [PMID: 16115609]
[http://dx.doi.org/10.1021/bi701496z] [PMID: 17915953]
[http://dx.doi.org/10.1124/dmd.108.025023] [PMID: 19131520]
[http://dx.doi.org/10.1021/bi00013a034] [PMID: 7703255]
[PMID: 8226746]
[http://dx.doi.org/10.1021/cr00018a008]
[http://dx.doi.org/10.1146/annurev.arplant.56.032604.144208] [PMID: 16669784]
[http://dx.doi.org/10.1016/B978-0-08-092387-1.50013-8]
[http://dx.doi.org/10.1105/tpc.13.2.425] [PMID: 11226195]
[http://dx.doi.org/10.1039/b807209b] [PMID: 18846276]
[http://dx.doi.org/10.1039/b802660m] [PMID: 18846279]
[http://dx.doi.org/10.1073/pnas.1201744109] [PMID: 22566621]
[PMID: 4378982]
[http://dx.doi.org/10.1073/pnas.252626999] [PMID: 12456881]
[http://dx.doi.org/10.1126/science.3029864] [PMID: 3029864]
[http://dx.doi.org/10.1126/science.7361112] [PMID: 7361112]
[http://dx.doi.org/10.1073/pnas.0502173102] [PMID: 15870194]
[http://dx.doi.org/10.1074/jbc.M314251200] [PMID: 14988408]
[http://dx.doi.org/10.1074/jbc.272.21.13562] [PMID: 9153203]
[http://dx.doi.org/10.1038/84955] [PMID: 11224565]
[http://dx.doi.org/10.1016/S0022-2836(02)00383-2] [PMID: 12079357]
[http://dx.doi.org/10.1016/0968-0004(80)90141-3]
[http://dx.doi.org/10.1016/S1367-5931(99)00079-4] [PMID: 10742194]
[http://dx.doi.org/10.1016/S0162-0134(00)00156-2] [PMID: 11132636]
[http://dx.doi.org/10.1021/ar9001685] [PMID: 19827796]
[http://dx.doi.org/10.1002/0471140856.tx0901s00]
[PMID: 15345144]
[PMID: 18276984]
[http://dx.doi.org/10.1074/jbc.M109.028001] [PMID: 19556236]
[http://dx.doi.org/10.1159/000154819]
[PMID: 6892813]
[http://dx.doi.org/10.1021/bi00214a012] [PMID: 8260499]
[PMID: 8288555]
[http://dx.doi.org/10.1074/jbc.273.2.945] [PMID: 9422754]
[http://dx.doi.org/10.1021/ja0002868]
[http://dx.doi.org/10.1021/ja010490a] [PMID: 11439033]
[http://dx.doi.org/10.1074/jbc.M010349200] [PMID: 11121422]
[http://dx.doi.org/10.1002/pro.5560070820] [PMID: 10082382]
[http://dx.doi.org/10.1107/S0907444998003448] [PMID: 9757125]
[http://dx.doi.org/10.1038/12319] [PMID: 10467099]
[http://dx.doi.org/10.1016/S0014-5793(00)01353-3] [PMID: 10760513]
[http://dx.doi.org/10.1074/jbc.M009974200] [PMID: 11297521]
[http://dx.doi.org/10.1074/jbc.M211249200] [PMID: 12480929]
[http://dx.doi.org/10.1021/ja0122391] [PMID: 11853459]
[http://dx.doi.org/10.1074/jbc.M112.378042] [PMID: 22923613]
[http://dx.doi.org/10.1074/jbc.M707396200] [PMID: 17965015]
[http://dx.doi.org/10.1021/bi025662a] [PMID: 12044160]
[http://dx.doi.org/10.1074/jbc.M211450200] [PMID: 12500973]
[http://dx.doi.org/10.1074/jbc.M113.486936] [PMID: 24106279]
[http://dx.doi.org/10.1021/bi5009694] [PMID: 25496210]
[http://dx.doi.org/10.1021/bi301175x] [PMID: 23043644]
[http://dx.doi.org/10.1021/ja00127a013]
[http://dx.doi.org/10.1074/jbc.M400491200] [PMID: 14966119]
[http://dx.doi.org/10.1021/bi027268i] [PMID: 12924938]
[http://dx.doi.org/10.1074/jbc.M207267200] [PMID: 12235152]
[http://dx.doi.org/10.1002/jrs.2797]
[http://dx.doi.org/10.1074/jbc.M609112200] [PMID: 17095508]
[http://dx.doi.org/10.1016/j.jmb.2004.05.048] [PMID: 15312758]
[http://dx.doi.org/10.1046/j.1432-1033.2002.03230.x] [PMID: 12392555]
[http://dx.doi.org/10.1074/jbc.274.26.18196] [PMID: 10373419]
[http://dx.doi.org/10.1016/j.bbrc.2005.08.176] [PMID: 16154530]
[http://dx.doi.org/10.1074/jbc.M503529200] [PMID: 16115896]
[http://dx.doi.org/10.1016/j.jinorgbio.2010.11.010] [PMID: 21194630]
[http://dx.doi.org/10.1016/j.jinorgbio.2004.07.004] [PMID: 15522396]
[http://dx.doi.org/10.1074/jbc.M303682200] [PMID: 12794075]
[http://dx.doi.org/10.1073/pnas.94.16.8411] [PMID: 9237990]
[http://dx.doi.org/10.1074/jbc.M111.230532] [PMID: 21345800]
[http://dx.doi.org/10.1016/j.str.2013.06.022] [PMID: 23911089]
[http://dx.doi.org/10.1371/journal.pbio.1001222] [PMID: 22205878]
[http://dx.doi.org/10.1002/anie.201101077] [PMID: 21688358]
[http://dx.doi.org/10.1074/jbc.M807868200] [PMID: 19171935]
[http://dx.doi.org/10.1073/pnas.1322034111] [PMID: 24550278]
[http://dx.doi.org/10.1074/jbc.M406203200] [PMID: 15516695]
[http://dx.doi.org/10.1016/j.bbrc.2008.01.016] [PMID: 18194664]
[http://dx.doi.org/10.1074/jbc.M606163200] [PMID: 16928691]
[http://dx.doi.org/10.1023/B:PRES.0000036882.19322.0a] [PMID: 16034533]
[http://dx.doi.org/10.1093/pcp/pcr108] [PMID: 21828104]
[http://dx.doi.org/10.1023/A:1005855010560]
[http://dx.doi.org/10.1046/j.1365-313X.1998.00186.x] [PMID: 9744099]
[http://dx.doi.org/10.1021/bi0480483] [PMID: 15766254]
[http://dx.doi.org/10.1111/j.1432-1033.2004.04411.x] [PMID: 15560792]
[http://dx.doi.org/10.1021/bi0110239] [PMID: 11560504]
[http://dx.doi.org/10.1074/jbc.M311631200] [PMID: 14645223]
[http://dx.doi.org/10.1021/bi049687g] [PMID: 15122889]
[http://dx.doi.org/10.1039/b604180a] [PMID: 17534530]
[http://dx.doi.org/10.1016/j.jinorgbio.2012.04.012] [PMID: 22673156]
[http://dx.doi.org/10.1016/0304-4165(81)90465-7] [PMID: 6894392]
[http://dx.doi.org/10.1016/j.bmcl.2004.12.075] [PMID: 15713406]
[http://dx.doi.org/10.1038/sj.bjp.0706555] [PMID: 16331285]
[http://dx.doi.org/10.1021/jm0511435] [PMID: 16821802]
[http://dx.doi.org/10.1021/bi062264p] [PMID: 17253780]
[http://dx.doi.org/10.1098/rsif.2012.0697] [PMID: 23097500]
[http://dx.doi.org/10.1371/journal.pone.0029514] [PMID: 22276118]
[http://dx.doi.org/10.1016/j.jinorgbio.2009.10.011] [PMID: 19917515]
[http://dx.doi.org/10.1021/jm900434f] [PMID: 19601578]
[http://dx.doi.org/10.1021/jm800505m] [PMID: 18798608]
[http://dx.doi.org/10.1021/ic901869t] [PMID: 20380462]
[http://dx.doi.org/10.1093/oxfordjournals.jbchem.a132615] [PMID: 40968]
[PMID: 7217067]
[http://dx.doi.org/10.1006/abbi.1993.1044] [PMID: 8424666]
[http://dx.doi.org/10.2183/pjab.55.84]
[http://dx.doi.org/10.1002/pro.2975] [PMID: 27364382]
[http://dx.doi.org/10.1042/BJ20061651] [PMID: 17402939]
[http://dx.doi.org/10.1107/S0907444900008520] [PMID: 10957639]
[http://dx.doi.org/10.1107/S1744309110053431] [PMID: 21393834]
[http://dx.doi.org/10.1038/ncomms14397] [PMID: 28169272]
[http://dx.doi.org/10.1074/jbc.M108239200] [PMID: 11773068]
[http://dx.doi.org/10.1074/jbc.M010753200] [PMID: 11278740]
[PMID: 11181945]