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Abstrak :
Infeksi DENV masih menjadi masalah kesehatan masyarakat di Indonesia karena dapat menyebabkan penyakit berat dan bahkan mungkin berakibat fatal. Pengembangan vaksin rekombinan dengan antigen yang mampu dengan efektif menginduksi respon imun perlu untuk dikembangkan. Kesesuaian genotipe yang digunakan di vaksin dan genotipe yang beredar di suatu wilayah berimplikasi terhadap keberhasilan pengembangan vaksin. Plasmid rekombinan yang dirancang berdasarkan gen prM-E DENV-2 strain 151 diekspresikan di Pichia pastoris strain X-33. Telah dilakukan optimasi ekspresi dan antigenisitas protein rekombinan prM-E. Diperoleh 4 koloni P. pastoris rekombinan dengan fenotipe Mut . Hasil SDS-PAGE dan Western blot menunjukkan protein telah berhasil diekspresikan pada ukuran 50 kDa. Kondisi ekspresi optimum protein rekombinan prM-E DENV-2 yaitu pada konsentrasi metanol 1 dengan waktu inkubasi 48 jam. Protein rekombinan prM-E DENV-2 dikenali oleh antibodi anti- prM-E DENV-2 dan bereaksi silang dengan antibodi anti-prM-E DENV-1, DENV-3, serta DENV-4. Protein rekombinan prM-E DENV-2 yang diperoleh dapat digunakan sebagai antigen dalam pengembangan vaksin protein rekombinan dengue strain Indonesia. ......DENV infection is still a public health problem in Indonesia because it can cause severe illness and may even be fatal. Development of recombinant vaccine with antigens capable of effectively inducing an immune response needs to be developed. The suitability of genotypes used in vaccines and genotypes circulating in a region has implications for the successful development of vaccines. Construction of a recombinant plasmid based on prM E gene of DENV 2 strain 151 was used for expression in Pichia pastoris strain X 33. Optimization and antigenicity of DENV 2 prM E recombinant protein were tested. Four Mut phenotypes were generated. SDS PAGE and Western blot analysis showed that the protein was expressed with a molecular weight of 50 kDa. Optimal protein expression level occurred at concentration of 1 methanol with 48 hours incubation time. DENV 2 prM E recombinant protein was recognized by anti prM E DENV 2 and also showed cross reaction with anti prM E DENV 1, DENV 3, and DENV 4 antibodies. Thus, the DENV 2 prM E recombinant protein can be used as an antigen in the development of the recombinant protein vaccine of the dengue strains of Indonesia.

Abstrak :
Demam Dengue (DD) dan Demam Berdarah Dengue (DBD) adalah penyakit yang tersebar luas. Penelitian ini dilakukan untuk mengembangkan kandidat vaksin dengue nasional berbasis protein sub unit prM/E DEN-4. Protein prM/E adalah kompleks unik yang berperan penting dalam perakitan virus dan modulasi fusi. Penelitian telah dilakukan dengan metode Gateway cloning system untuk menklon gen prM/E dalam plasmid cloning pDONR221 kemudian dilakukan subkloning dan dipindahkan gen prM/E ke dalam plasmid eksperesi pET-55-DEST. Ekspresi protein prM/E dilakukan di dalam E.coli BL21 (DE3) dengan induksi Isoprophyl-β-D-thiogalactopyranoside (IPTG). Pendeteksian poliprotein Gag hasil ekspresi dilakukan dengan metode Sodium Dodecyl Sulphate Polyacrilamide Gel Electrophoresis (SDS-PAGE). Setelah protein prM/E berhasil dideteksi kemudian protein prM/E dipurifikasi dengan menggunakan metode immobilized metal affinity chromatography (IMAC) di bawah kondisi denaturasi. Hasil penelitian yaitu protein prM/E dapat diekspresikan dalam E.coli BL21 (DE3) dengan berat molekul ~75 kDa.

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Dengue Fever is an infectious disease caused by one of the four serotypes of dengue virus (DENV). Until now, no licensed vaccines or antivirus is available commercially. Because of that, this research was aimed to develop candidate vaccine dengue based on protein subunit pre-membrane and Envelope (prM/E). Protein prM/E is a unique complex which has important role in virus assembly and host cell entry. The recombinant protein development was done using Gateway cloning system. This was used to clone the prM/E gene into pDONR221 plasmid. The cloned gene was then transferred into pET-55-DEST expression plasmid. Expression of protein prM/E was perfomed in E. coli BL21 (DE3) with inducer Isoprophyl-β-D-thiogalactopyranoside (IPTG). Sodium Dodecyl Sulphate Polyacrilamide Gel Electrophoresis (SDS-PAGE) method was used to detect the expressed prM/E protein. Upon detection of prM/E protein with SDS-PAGE, the recombinant protein was purified by using immobilized metal affinity chromatography (IMAC) method under denature condition. Using these methods, the prM/E protein was successfully expressed in E.coli BL21 (DE3) with a molecular weight ~75 kDa.