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"Protein Jembrana Superficial Unit (JSU) dapat dijadikan sebagai vaksin untuk pengobatan penyakit Jembrana. Protein JSU, yang dikode oleh gen env, disisipkan ke dalam plasmid pGEX-6P1 dan diekspresikan melalui Escherichia coli strain BL21 sebagai inangnya. Tujuan penelitian adalah untuk meneliti berbagai pengaruh konsentrasi IPTG terhadap ekspresi protein rekombinan JSU pGEX-6P1. Sel E. coli (pembawa konstruk pGEX-6P1) ditumbuhkan pada medium Luria Betani (LB) cair 50 ml dan diinkubasi pada shaker incubator hingga mencapai kepadatan sel (OD) OD600 0,6. Induksi Isopropyl-β-Dthiogalactopyranoside (IPTG) selama 1 jam dengan tiga konsentrasi perlakuan, yaitu 100 μM, 150 μM, dan 200 μM. Sel dipecah dengan dua metode, yaitu Freeze and thaw dan sonikasi kemudian pelet hasil pemecahan sel dikoleksi sebagai inclusion body. Solubilisasi protein dilakukan dengan menambahkan solubilize buffer pada pelet kemudian dilution buffer untuk tahap refolding. Protein dimurnikan melalui Gluthatione Sepharose 4B dengan metode batch capture. Hasil analisis SDS-PAGE menunjukkan ukuran protein JSU pGEX-6P1 yang tepat, yaitu ± 60 kDa pada setiap perlakuan (konsentrasi) IPTG. Pita pada induksi IPTG 100 μM terlihat lebih tebal dibandingkan dengan pita pada induksi 150 μM dan 200 μM. Hasil penelitian disimpulkan bahwa induksi IPTG 100 μM menghasilkan protein rekombinan JSU pGEX-6P1 yang optimal.

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Jembrana Superficial Unit (JSU) protein can be used as a vaccine material for controlling Jembrana disease. JSU protein that encoded by the env gene was inserted into the plasmid pGEX-6P1 and expressed through the Escherichia coli strain of BL21 as a host. The aim of this study was to determine the effect of IPTG concentrations against the expression of JSU pGEX-6P1 recombinant protein. E. coli cells (pGEX-6P1 constructs carrier) were grown in 50 ml Luria Bertani (LB) liquid medium and was incubated on a shaker incubator until it reaches the cell density (OD) OD600 0.6. Induction of Isopropyl-β-Dthiogalactopyranoside (IPTG) for 1 hour with three concentrations of the treatment, there are 100 μM, 150 μM, and 200 μM. The cells was disrupted by two methods of cell lysis, Freeze and thaw and sonication, then the pellet was collected as inclusion body. Protein is solubilized by adding a buffer into the pellet and using dilution buffer for refolding step. Proteins purified using Gluthatione Sepharose 4B by batch capture method. The analysis of SDS-PAGE was shown exactly the protein size of JSU pGEX-6P1 ± 60 kDa for each treatment (concentration) IPTG. Band at 100 μM IPTG induction seems thicker than the band on the induction of 150 μM and 200 μM. The study was concluded that 100 μM IPTG induction produces an optimal of JSU pGEX-6P1 recombinant protein."

"Penyakit Jembrana adalah penyakit viral akut yang hanya menyerang sapi Bali (Bos sondaicus). Jembrana Transmembrane (JTM) merupakan salah satu protein viral yang dapat digunakan sebagai bahan pembuatan vaksin Jembrana. Penelitian bertujuan untuk mendapatkan nilai optimum kepadatan sel Escherichia coli BL21 terhadap ekspresi protein rekombinan JTM pGEX. Re-transformasi dilakukan untuk mendapatkan transforman baru yang memiliki plasmid yang masih aktif. Hasil re-transformasi diperoleh dua koloni transforman. Ekspresi protein rekombinan JTM-pGEX dilakukan dengan menggunakan induksi IPTG 100 mM pada nilai OD600 0,4; 0,6; dan 0,8. Hasil penelitian menunjukkan ekspresi protein rekombinan JTM-pGEX paling tinggi didapatkan pada nilai OD600 = 0,6 (hasil refolding) dan OD600 = 0,4 (hasil solubilisasi).

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Jembrana disease is an acute viral disease in Bali cattle (Bos sondaicus). Jembrana Transmembrane (JTM) is one of viral protein which can be utilized as a material for Jembrana vaccine. The aim of the research was to determine the best value of Escherichia coli BL21 optical density in order to get optimal expression of recombinant protein JTM-pGEX. Re-transformasion was conducted to get new transformant which have an active DNA plasmid. The result showed two transformant colonies of Escherichia coli BL21. Expression of recombinant protein JTM-pGEX was carried out using induction IPTG 100 mM in OD600 0.4; 0.6; and 0.8. The result revealed that the best value of OD600=0.6 produced the highest expression of recombinant protein JTM-pGEX after refolding while OD600 0.4 produced the highest expression of recombinant protein JTM-pGEX after solubilization."

"ABSTRAKGen Kappa-kasein (KCN) merupakan gen yang mengatur komposisi dan produktivitas susu pada hewan ternak, termasuk kerbau asli Indonesia. Penelitian mengenai polimorfisme gen KCN di Indonesia belum banyak dilakukan. Penelitian bertujuan untuk mengetahui ada atau tidaknya polimorfisme gen KCN pada kerbau dan mengetahui frekuensi genotip serta alel gen KCN kerbau. Sampel yang digunakan adalah sampel darah dengan jumlah 6 sampel kerbau lumpur dan 6 sampel kerbau sungai. Metode yang digunakan adalah PCR-RFLP dengan enzim restriksi HindIII. Amplifikasi sekuen DNA target pada ekson 4 gen KCN kerbau menggunakan metode PCR menghasilkan amplikon sepanjang 379 bp. Berdasarkan hasil PCR-RFLP, didapatkan frekuensi genotip BB sebesar 100% dan frekuensi alel B sebesar 1,00. Baik pada kerbau lumpur maupun kerbau sungai, gen KCN ditemukan monomorfik karena tidak terdapat variasi alel (alel A).

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ABSTRAKKappa-casein (KCN) gene is a protein encoding gene which associates with differences in bovine milk composition and productivity, including Indonesian buffalo. Kappa-casein (KCN) gene is known to have an important role in cheese production and casein micelle stabilization. However, the study about KCN gene polymorphism in Indonesia is rarely done. This study aimed to investigate the existence of KCN gene polymorphisms along with genotyping and allelic frequencies of KCN gene performed by PCR-RFLP using HindIII restriction endonuclease. A total number of 6 water buffalo and 6 swamp buffalo samples were used. Amplicon of 379 bp in length was produced by PCR amplification in exon 4 of buffalo KCN gene. Genotyping of 12 samples revealed that all buffalo samples were monomorphic, showing only BB genotype. The calculated genotype frequency for BB was 100%, meanwhile the allelic frequency for B was 1.00."