Crystal structures of chicken liver dihydrofolate reductase: binary thioNADP+ and ternary thioNADP+.biopterin complexes.

Crystal structures of chicken liver dihydrofolate reductase: binary thioNADP+ and ternary thioNADP+.biopterin complexes.
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鸡肝二氢叶酸还原酶的晶体结构:二元硫代NADP和三元硫代NADP.生物蝶呤复合物。

DOI:
10.1021/bi00078a008
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发表时间:
1993
期刊:
影响因子:
2.9
通讯作者:
Kraut,J
Kraut,J
中科院分区:
生物学3区
文献类型:
--
作者:
McTigue,MA;Davies2nd,JF;Kaufman,BT;Kraut,J

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材料和方法ThioNADP+二元复合物。如前所述(考夫曼和Kemerer,1977),从鸡肝中纯化二氢叶酸还原酶。通过与用于cDHFR-NADPH复合物结晶的程序类似的程序生长晶体(Volz等人,1982年)。将含有15 mg/mL cDHFR、2 mM硫代NADP+的200 mL溶液等分试样(Sigma Chemical)、10 mM乙酸钙、2 mM二硫苏糖醇和20 mM缓冲于pH 7.5的Tris-HCl置于1-mL烧杯中,将烧杯置于悬浮在玻璃皿内的平台上,高于15 mL含有23%(v/v)乙醇、10 mM乙酸钙、和20 mM Tris-HCl缓冲液(pH 7.5)。盖上结晶皿,在4 ℃下通过蒸汽扩散使蛋白质溶液与储库溶液平衡。3天内出现了属于空间群C2的大晶体(~ 1.2 X 0.5 X 0.3 mm),其中a- 89.0 k,B= 48.2 k,c= 64.1 x,ß= 124.6。将选择用于数据收集的晶体在含有40%乙醇、10 mM乙酸钙、2 mM thioNADP+和20 mM Tris-HCl的pH 7.5缓冲溶液中冲洗,然后将其固定在玻璃毛细管中。使用UCSD多线区域检测器(Cork等人,1973; Xuong等人,1985年)。在用当地开发的程序(安德森,1987)处理数据后,对于包含87%的所有独特反射的数据集,Riym 3为0.03,布拉格间距为2.3 μ m。
MATERIALS AND METHODSThe ThioNADP+ Binary Complex. Dihydrofolate reduc-tase was purified from chicken livers as previously described (Kaufman & Kemerer, 1977). Crystals were grown by a procedure similar to that used for crystallization of the cDHFR-NADPH complex (Volz et al., 1982). A 200-mL aliquot of a solution containing 15 mg/mL cDHFR, 2 mM thioNADP+(Sigma Chemical), 10 mM calcium acetate, 2 mM dithiothreitol, and 20 mM Tris-HCl buffered at pH 7.5 was put in a 1-mL beaker, which was placed on a platform suspended inside a glass dish above 15 mL of a reservoir solution containing 23%(v/v) ethanol, 10 mM calcium acetate, and 20 mM Tris-HCl bufferedat pH 7.5. The crystallization dish was covered, and theprotein solution was allowed to equilibrate with the reservoir solution by vapor diffusion at 4 C. Large crystals (~ 1.2 X 0.5 X 0.3 mm) belonging to space group C2 with a- 89.0 k, b= 48.2 k, c= 64.1 Á, and ß= 124.6 appeared within 3 days. Crystals chosen for data collection were rinsed in a solution containing 40% ethanol, 10 mM calcium acetate, 2 mM thioNADP" 1", and 20 mM Tris-HCl buffered at pH 7.5 before they were mounted in glass capillaries. A set of reflectionintensities comprising 24 984 observations of 8627 unique reflections was collected on one crystal at ambient temperature (~ 20 C) using the UCSD Multiwire Area Detector (Cork et al., 1973; Xuong et al., 1985). After the data were processed by locally developed programs (Anderson, 1987), the Riym3 was 0.03 for a data set containing 87% of all unique reflections to a Bragg spacing of 2.3 Á.
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