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This paper presents a combined approach with two aims. The first is to analyze the reported sequence of the enzyme ubiquitin carboxyl-terminal hydrolase 14 of Giardia intestinalis (UBP6) through computational methods to find components related with its hypothetical function. The second is to determine if the protein-coding gene is expressed in G. intestinalis and, if such is the case, also determine its transcription pattern along the life cycle of the parasite. It was established that the protein belongs to the family of Cys-dependent deubiquitinases and more specifically to ubiquitin specific proteases (USPs). Moreover, the catalytic center with the complete triad as well as typical features of the USP motif were also identified. Since the computational findings suggest that the enzyme could be functional, reverse transcription coupled to PCR was used as a first approach to establish if in fact the coding gene is expressed in the parasite. Interestingly, it was found not only that the gene is expressed, but also that there is a transcription variation along the life cycle of the parasite. These two findings are the starting point for further studies since they tentatively suggest that this enzyme could be involved in the protein turnover that occurs during parasite encystation. Although preliminary, this study is the first report concerning the study of a specific deubiquitinating enzyme in the parasite G. intestinalis.

revista colombiana de química/revista colombiana de quimica

Preliminary study of the enzyme ubiquitin carboxylterminal hydrolase 14 (UBP6) in Giardia intestinalis: structural bioinformatic analysis and transcriptional profile during encystation