Total RNA was extracted from tachyzoites of RH strain of Toxoplasma gondii. The open reading frame of ROP11 gene was amplified by using a pair of specific primers designed according to the coding sequence of ROP11 gene (Accession No. DQ077905). The RT-PCR product was digested by restriction enzyme EcoR I and Not I, and then ligated into a pGEX-6P-2 vector. The recombinant plasmid was transferred into E. coli XL-Blue. The positive clones was selected by colony PCR, and confirmed by the double restriction enzyme digestion and sequencing. The RT-PCR product was 1,548 bp. The recombinant plasmid was confirmed by colony PCR and double restriction enzyme digestion. Sequencing results showed that the obtained ROP11 gene was 1 548 bp (Accession No. KC456639). There was a high sequence consistency (99%) between the obtained ROP11 gene sequence and the Toxoplasma ROP11 gene from GenBank. Bioinformatics analysis showed that the ROP11 protein (Mr 57,020) consisted of the signal peptide (amino acids 1-26), 12 conservative domains, a serine/threonine protein kinase catalytic domain (amino acids 170-511), and two potential N-glycosylation sites.
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