BIOKONVERSI SEFALOSPORIN C MENJADI ASAM 7-AMINOSEFALOSPORANAT DENGAN SEFALOSPORIN ASILASE
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Abstract
Sefalosporin merupakan antibiotik golongan β-laktam yang paling banyak digunakan di dunia dan secara klinis aktif terhadap bakteri gram positif dan gram negatif. Sefalosporin C merupakan sefalosporin alami yang dihasilkan oleh kapang Cephalosporium acremonium. Sefalosporin C mempunyai aktivitas antibakteri moderat dengan nilai konsentrasi hambat minimum 25-100 µg/mL untuk bakteri gram positif dan 12-25 µg/mL untuk bakteri gram negatif. Sefalosporin C dapat diubah menjadi asam 7-aminosefalosporanat (7-ACA) sebagai senyawa antara untuk pembuatan turunan sefalosporin dengan metode enzimatik secara dua atau satu tahap. Produksi 7-ACA secara enzimatik dapat menggunakan metode dua tahap dan satu tahap enzimatik. Metode enzimatik secara dua tahap menggunakan enzim asam D-amino oksidase (DAAO) untuk menghasilkan asam glutaril-7-aminosefalosporinat (GL-7-ACA) pada tahap pertama dan menggunakan asam glutaril-7-aminosefalosporinat asilase untuk menghasilkan 7-ACA pada tahap kedua. Metode enzimatik secara satu tahap menggunakan sefalosporin asilase untuk mengubah CPC menjadi 7-ACA secara langsung. Beberapa mikroorganisme penghasil sefalosporin asilase yaitu Pseudomonas sp., Bacillus megaterium, Aeromonas sp., dan Arthrobacter. Aktivitas CPC asilase alami sangat rendah dan rekayasa genetik digunakan untuk meningkatkan aktivitasnya.
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