从大肠杆菌dUTPase的精细结构。
文章的细节
-
引用
-
爱抚Z,威尔逊KS,拉尔森G, Nyman PO, Cedergren-Zeppezauer ES
从大肠杆菌dUTPase的精细结构。
Acta Crystallogr D Crystallogr杂志。1998年9月1;54 (Pt 5): 735 - 49。
- PubMed ID
-
9757088 (在PubMed]
- 文摘
-
脱氧尿苷5 '三磷酸nucleotidohydrolase (dUTPase。3.6。1.23)催化水解的dUTP转储和焦磷酸核苷酸代谢和DNA合成。重组大肠杆菌酶的晶体,沉淀从琥珀酸聚乙二醇混合物的pH值4.2,1.9是用于收集同步衍射数据分辨率,在空间群R3, A = b = 86.62, c = 62.23。汞和铂导数数据收集在波长优化反常的贡献。结果2.2苧藁增二阶段不同于最后一组平均40度和产生一个优秀的地图很容易解释。该模型包含132个水分子和精制的R值13.7%。136年残留有明确的电子密度的152年预期从基因序列。16 c端残留可能是无序晶格。单体是一种“果冻卷”类型,主要含有β褶板且只有一个短的螺旋。分子是一个严密的三聚物。 A long C-terminal arm extends from one subunit and encompasses the next one within the trimer contributing to its beta-sheet. Conserved sequence motifs common among dUTPases, previously suggested to compose the active site and confirmed in a recent study of the dUDP complex, are located at subunit-subunit interfaces along the threefold axis, in parts of the beta-sheet and in loop regions. A similar molecular architecture has recently been found in two other trimeric dUTPases.