1
|
Barakat AZ, Abdel-Aty AM, Ibrahim MK, Salah HA, Hegazy UM, Azouz RAM, Bassuiny RI, Shaapan RM, Mohamed SA. Purification and characterization of cysteine protease of Sarcocystis fusiformis from infected Egyptian water buffaloes. Sci Rep 2023; 13:16123. [PMID: 37752241 PMCID: PMC10522634 DOI: 10.1038/s41598-023-43147-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 09/20/2023] [Indexed: 09/28/2023] Open
Abstract
Sarcocystis spp. infects water buffaloes (Bubalus bubalis) causing sarcocystosis. In the present study, Sarcocystis fusiformis was recognized in Egyptian water buffaloes based on histological observation and molecular analysis of internal transcribed spacer 1 (ITS1), 18S ribosomal RNA (18S rRNA) and cytochrome c oxidase subunit I (COX-1) gene fragments. Chemotherapy and vaccines against Sarcocystis spp. could potentially target proteases because they may play a crucial role in the infection. Cysteine proteases are multifunctional enzymes involved in vital metabolic processes. However, the involvement of proteases in S. fusiform infection has not yet been characterized. Here, the purification and study on some biochemical properties of protease isolated from cysts of S. fusiform were carried out. Protease with a molecular weight of 100 kDa was purified. LC-MS/MS analyzed the protein sequence of purified protease and the data suggested that the enzyme might be related to the cysteine protease. The purified protease exhibited maximum activity at pH 6 and a temperature of 50 °C. The Michaelis-Menten constant (Km), the maximum velocity (Vmax), and the turnover number (Kcat) were determined. The complete inhibition effect of cysteine inhibitors indicated that the purified enzyme is a cysteine protease. The results suggested that S. fusiform proteolytic enzyme may be necessary for parasite survival in water buffaloes by digesting host tissues. Therefore, cysteine protease could be a suitable target for vaccinations.
Collapse
Affiliation(s)
- Amal Z Barakat
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt.
| | - Azza M Abdel-Aty
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Marwa K Ibrahim
- Department of Microbial Biotechnology, National Research Centre, Dokki, Cairo, Egypt
| | - Hala A Salah
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Usama M Hegazy
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Rasha A M Azouz
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Roqaya I Bassuiny
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Raafat M Shaapan
- Zoonotic Disease Department, National Research Centre, Dokki, Cairo, Egypt
| | - Saleh A Mohamed
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt.
| |
Collapse
|