PENGARUH VARIASI KONSENTRASI METANOL DAN LAMA INDUKSI TERHADAP EKSPRESI PROINSULIN OLEH Pichia pastoris SECARA INTRASELULER
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Abstract
Diabetes melitus merupakan kelainan yang ditandai dengan hiperglikemia. Penderita diabetes pada tahun 2014 di dunia mencapai 215 juta dan diperkirakan akan meningkat pada tahun 2040. Umumnya penderita diabetes diberi pengobatan insulin sehingga menunjukkan akan ada peningkatan kebutuhan insulin. Produksi insulin dengan teknologi DNA rekombinan telah dilakukan dengan menggunakan sistem ekspresi E. coli dan S. cerevisiae namun masih belum efisien. Sistem alternatif lain adalah ragi metilotropik Pichia pastoris. Dalam penelitian ini dilakukan ekspresi proinsulin dari P. pastoris secara intraseluler. Galur P. pastoris yang digunakan dalam penelitian ini adalah X33, GS115, dan KM71H. Semua galur rekombinan adalah MutS. Media tumbuh terbaik adalah BMGY. Ekspresi proinsulin terlihat pada suhu 25°C. Hasil PCR menunjukkan bahwa galur GS115-PI yang dapat menghasilkan pita amplikon berukuran 504 bp. Hasil PCR ini dibuktikan oleh hasil seleksi galur yang menunjukkan bahwa galur GS115-PI dapat mengekspresi proinsulin dibandingkan galur lainnya. Berdasarkan kecepatan pembentukan pita protein proinsulin, variasi konsentrasi akhir metanol 0,5% dengan lama induksi 72 jam merupakan perlakuan terbaik.
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