Structure of a single amino acid mutant of aspartate carbamoyltransferase at 2.5-A resolution: implications for the cooperative mechanism.

Structure of a single amino acid mutant of aspartate carbamoyltransferase at 2.5-A resolution: implications for the cooperative mechanism.
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2.5-A 分辨率的天冬氨酸氨基甲酰转移酶单氨基酸突变体的结构:对合作机制的影响。

DOI:
10.1021/bi00430a056
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发表时间:
1989
期刊:
影响因子:
2.9
通讯作者:
Kantrowitz,ER
Kantrowitz,ER
中科院分区:
生物学3区
文献类型:
--
作者:
Gouaux,JE;Lipscomb,WN;Middleton,SA;Kantrowitz,ER

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Materials and MethodsCrystal Growth. The Tyr240—* Phe mutant of aspartate carbamoyltransferase, prepared and purified as previously described (Middleton & Kantrowitz, 1986), was stored at-20C as a 25 mg/mL solution in 1: 1 (v/v) glycerol/storage buffer [40 mM K2P04, 2.0 mM/J-mercaptoethanol, 0.2 mM EDTA (pH 7.0)] and was dialyzed for 24 h against storage buffer prior to crystallization. The enzyme solution was diluted to 20 mg/mL with storage buffer and filtered through a 0.22-^ m filter (Millipore GV). Crystallization was effected by dialyzing the enzyme solution, at room temperature, against a buffer of 40 mM sodium citrate, 1.0 mM/j-mercaptoethanol, 0.2 mM EDTA, and 1.0 mM CTP with the pH adjustedto 5.8 by HCI. Typically, hexagonal plates in the space group
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