期刊
JOURNAL OF BIOMEDICINE AND BIOTECHNOLOGY
卷 -, 期 -, 页码 -出版社
HINDAWI LTD
DOI: 10.1155/2009/837608
关键词
-
资金
- Ministerio de Ciencia e Innovacion [AGL2003-06976/GAN, AGL200607420/GAN]
- (Junta de Castilla y Leon) from the Spanish Kingdom [GR238]
Cryptosporidium parvum, one of the most important causative organisms of human diarrheas during childhood, contains a monomeric DNA-topoisomerase IB (CpTopIB) in chromosome 7. Heterologous expression of CpTopIB gene in a budding yeast strain lacking this activity proves that the cryptosporidial enzyme is functional in vivo. The enzymatic activity is comprised in a single polypeptide, which contains all the structural features defining a fully active TopIB. Relaxation activity of the yeast extracts was detected only when CpTopIB ORF was expressed in a yeast expression system showing time and protein dependence under steady state kinetic conditions. The susceptibility of CpTopIB-transformed yeast to the irreversible inhibitor camptothecin and its water-soluble derivatives (topotecan and SN-38) was assessed. Copyright (C) 2009
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