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      저자 : Ponniah Saravana Perumal (검색결과 1 건)
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        Optimization of codon usage of the envelope protein E2 gene from various genotypes of hepatitis C virus to predict the expression level in Pichia pastoris

        Arockiasamy Santhiagu,Ponniah Saravana Perumal,Stevin Wilson 한국유전학회 2016 Genes & Genomics Vol.38 No.10

        Hepatitis C virus infection (HCV) alarmingly increases worldwide; it causes chronic hepatitis, liver cirrhosis and hepatocellular carcinoma, so there is urgent need of developing effective and sufficient quantity of vaccine. HCV envelope protein E2 is the main target for developing as a vaccine candidate. Presently recombinant proteins can successfully be used as a vaccine for many diseases. This concern, it is challenging to produce sufficient quantities of many recombinant proteins from their expression hosts. One of the main factors affecting the success of expression of foreign genes in heterologous hosts is the divergence of codon usage of the target gene from that used in the expression system. In this study, we optimized the various genotypes of HCV envelope protein E2 gene according to the codon usage of Pichia pastoris and predicted the expression level. Synonymous codon usage of E2 adapted to that used by P. pastoris was estimated using the relative synonymous codon usage value (RSCU), codon adaptation index (CAI) and effective number of codon (ENC). The CAI of optimized HCV E2 sequences was enhanced from 0.638 to 0.833 and %GC was decreased from 56.05 to 44.05; this was significantly (p\0.01) different from the native sequences. Codon with RSCU value less than one was replaced with most preferred synonymous codons. The ENC values of optimized HCV E2 sequences varied from 47.00 to 47.50, with a mean value of 47.15 and an SD of 0.14. Our study suggested that, from the measured values of predicted expression level, the codon optimized HCV E2 protein could be produced in sufficient quantity in the expression host; knowledge of the codon usage patterns of E2 of various genotypes facilitate the production of a promising unique vaccine candidate for HCV.

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