Adenosylcobalamin-dependent ribonucleoside triphosphate reductase from Lactobacillus leichmannii. Rapid, improved purification involving dGTP-based affinity chromatography plus biophysical characterization studies demonstrating enhanced, "crystallographic

Adenosylcobalamin-dependent ribonucleoside triphosphate reductase from Lactobacillus leichmannii. Rapid, improved purification involving dGTP-based affinity chromatography plus biophysical characterization studies demonstrating enhanced, "crystallographic
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来自莱希曼乳杆菌的腺苷钴胺依赖性核糖核苷三磷酸还原酶。

DOI:
10.1080/10826069908544929
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发表时间:
1999
影响因子:
2.9
通讯作者:
Finke,RG
Finke,RG
中科院分区:
工程技术4区
文献类型:
--
作者:
Suto,RK;Whalen,MA;Finke,RG

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核糖核苷三磷酸还原酶(Ribonucleoside triphosphate reductase,RTPR,EC 1.17.4.2)来源于莱氏乳杆菌(Lactobacillus leichmannii),是一种5′-脱氧腺苷钴胺素依赖性酶。RTPR也是一种典型的腺苷钴胺素依赖性核糖核苷酸还原酶,正如其名称所示,它将核糖核苷三磷酸(NTP)转化为脱氧核糖核苷三磷酸(dNTP)。底物与RTPR结合后,C3 Cbl的钴-碳键被裂解,生成cob(II)alamin、5′-脱氧腺苷和半胱氨酸(C408)衍生的巯基。在RTPR的10个半胱氨酸中,有5个半胱氨酸(Cys 119、408、419、731和736)参与了RTPR的催化机制。
Ribonucleoside triphosphate reductase (RTPR, EC 1.17.4.2) fromLactobacillus leichmanniiis a 5′-deoxyadenosylcobalamin-dependent (AdoCbl; Coenzyme B12) enzyme. RTPR is also a prototypical adenosylcobalamin-dependent ribonucleotide reductase, one that, as its name indicates, converts ribonucleoside triphosphates (NTP) to deoxyribonucleoside triphosphates (dNTP). Upon substrate binding to RTPR, AdoCbl's cobalt-carbon bond is cleaved to generate cob(II)alamin, 5′-deoxyadenosine, and the cysteine (C408) derived thiyl radical. Five key cysteines (Cys 119, 408, 419, 731, and 736), from among the ten total cysteines, are involved in RTPR's catalytic mechanism.
转铁蛋白中铁和阴离子结合的可能位点的鉴定
DOI: 10.1016/0968-0004(83)90078-6
发表时间: 1983
影响因子: 13.8
作者:
N. Chasteen
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