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Protease expression analysis in recently field-isolated strains of Trypanosoma cruzi: a heterogeneous profile of cysteine protease activities between TC I and TC II major phylogenetic groups.

机译:近期分离的克氏锥虫菌株中的蛋白酶表达分析:TC I和TC II主要系统发育组之间半胱氨酸蛋白酶活性的异质性。

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摘要

Protease expression among TCI and TCII field isolates was analysed. Gelatin-containing gels revealed hydrolysis bands with molecular masses ranging from 45 to 66 kDa. The general protease expression profile showed that TCII isolates presented higher heterogeneity compared to TCI. By utilizing protease inhibitors, we showed that all active proteases at acid pH are cysteine-proteases and all proteases active at alkaline pH are metalloproteases. However, the expression of cruzipain, the T. cruzi major cysteine-protease, did not reproduce a heterogeneous TCII cysteine zymogram profile. Dendogram analyses based on presence/absence matrices of proteases and cruzipain bands showed a TCI separation from the TCII group with 50-60% similarity. We suggest that the observed cysteine protease diversification contributes to differential host infection between TCI and II genotypes.
机译:分析了TCI和TCII野外分离株之间的蛋白酶表达。含明胶的凝胶显示出分子量在45至66 kDa之间的水解带。常规蛋白酶表达谱显示,与TCI相比,TCII分离物具有更高的异质性。通过利用蛋白酶抑制剂,我们显示了在酸性pH下所有活性蛋白酶都是半胱氨酸蛋白酶,在碱性pH下所有活性蛋白酶都是金属蛋白酶。但是,Cruzipain的表达,T。cruzi主要半胱氨酸蛋白酶,没有再现异质TCII半胱氨酸酶谱图。根据蛋白酶和crappain条带存在/不存在的矩阵进行的树状图分析显示,TCI与TCII组的分离率为50-60%。我们建议观察到的半胱氨酸蛋白酶的多样化有助于TCI和II基因型之间的宿主感染差异。

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