文献类型: 外文期刊
第一作者: Wang, Qiuxia
作者: Wang, Qiuxia;Zhang, Shaohua;Luo, Xuenong;Hou, Junling;Zhu, Xueliang;Cai, Xuepeng
作者机构:
关键词: Taenia pisiformis metacestode;Cysteine protease;Recombinant protein;Biochemical characteristics
期刊名称:VETERINARY PARASITOLOGY ( 影响因子:2.738; 五年影响因子:2.951 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: Rabbit cysticercosis, caused by the larval stage of Taenia pisiformis, is a serious parasitic disease of rabbits. It was reported that some cysteine peptidases have potential roles in-the pathogenesis of various parasitic infections. To investigate the biochemical characteristics and roles in the pathogenesis/host-invasion of cysteine peptidases, a cDNA sequence encoding for a cathepsin L-Iike cysteine protease (TpCP) was cloned and identified from-the T. pisiformis metacestodes. This sequence was 1220 bp in its length, which included a 1017 bp open reading frame encoding a 339 amino acid peptide. Multiple sequence alignments revealed a 28.9-88.5% similarity with cathepsin L-like cysteine proteases from other helminth parasites and mammals. The recombinant TpCP expressed in Escherichia coli did. not show the proteolytic activity by zymography gel assay. However, the TpCP expressed in Pichiapastoris had typical biochemical activities that could hydrolyze rabbit immunoglob-; ulin G, bovine serum albumin and flbronectin. Substrate studies indicated pronounced cleavage of Z-Phe-Arg-AMC. This activity was sensitive to cysteine protease inhibitor E-64 and immunohistochemistry results also indicated that TpCP was distributed as an intense positive reaction in the bladder wall. Our results gave us insights into future studies of TpCP's roles in the infection.
分类号: S85
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