3'-nucleotidase activity in procyclic and bloodstream stages of Trypanosoma rhodesiense.

3'-nucleotidase activity in procyclic and bloodstream stages of Trypanosoma rhodesiense.
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罗得西亚锥虫前循环阶段和血流阶段的 3-核苷酸酶活性。

DOI:
10.1016/0305-0491(86)90332-9
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发表时间:
1986
期刊:
Comparative biochemistry and physiology. B, Comparative biochemistry
影响因子:
--
通讯作者:
Dwyer,DM
Dwyer,DM
中科院分区:
--
文献类型:
--
作者:
Gottlieb,M;Gardiner,PR;Dwyer,DM

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罗得氏锥虫原环体和血流来源的锥虫都表现出能够降解3‘-核苷酸的核苷酸酶活性。在使用5‘-核苷酸底物的检测中,核酸酶活性在任何一种表型的制剂中都检测不到。原环锥虫裂解物中的3‘-核苷酸酶活性在100000克时可制粒,而血液形式的核苷酸酶活性在所用条件下是可操作的。这两个阶段的3‘-核苷酸酶活性都具有以下特征:最适pH为8.5,对嘌呤核苷酸具有底物选择性,对常用的磷酸酶抑制剂,包括氟化物、酒石酸和钼酸根离子具有抵抗力。这两种活性都被EDTA可逆地抑制,并被Co2+离子重新激活。通过精细结构细胞化学方法显示,3‘-核苷酸酶活性分布在原环锥虫的整个表面,但不包括具有完整表面被的血液寄生虫。
Both procyclic and bloodstream-derived trypanosomes of Trypanosoma rhodesiense exhibit a nucleotidase activity which is capable of hydrolyzing 3'-ribonucleotides. Nucleotidase activity in assays employing 5'-nucleotide substrates is not detectable in preparations of either phenotype. The 3'-nucleotidase activity in lysates of procyclic trypanosomes is pelletable at 100,000 g, whereas that activity from bloodstream forms is operationally soluble under the conditions employed. The 3'-nucleotidase activities of both stages share the following characteristics: pH optimum of 8.5, substrate preference for purine ribonucleotides, resistance to commonly used phosphatase inhibitors, including fluoride, tartrate and molybdate ions. Both activities are reversibly inhibited by EDTA and reactivated by Co2+ ions. As visualized by fine-structure cytochemical methods, 3'-nucleotidase activity was distributed over the entire surface of procyclic trypanosomes, but not bloodstream parasites bearing an intact surface coat.
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