Biochemical Analyses of Endoxylanases Cloned From Ruminococcus albus 7 and Their Application in Xylooligosacchride Production

Putri, RhytiaAyuChristianty (2014) Biochemical Analyses of Endoxylanases Cloned From Ruminococcus albus 7 and Their Application in Xylooligosacchride Production. Magister thesis, Universitas Brawijaya.

Abstract

Biomassa tanaman sebagai bahan lignoselulosa adalah sumber daya karbon terbarukan utama di Bumi. Sebagian besar biomassa ini dibuang sebagai `limbah`. Indonesia adalah produsen kelapa terbesar di dunia (cocos nucifera) dan kelapa sawit (Elaeis Guineensis), dan menghasilkan banyak biomassa lignoselulosa selain produk utama IR. Akan lebih baik jika biomassa lignoselulosa ini dapat dikonversi menjadi produk yang lebih berharga. Xylan sebagai bagian utama kedua dari bahan lignoselulosa dapat digunakan untuk menghasilkan berbagai produk bernilai tambah seperti biofuel, pakan ternak, bahan kimia dan aditif makanan seperti xylourigosccharide (xos), xyloster, dll. XOS adalah bahan makanan yang dapat dicerna telah dilaporkan banyak manfaat kesehatan. Beberapa enzim yang diproduksi oleh mikroorganisme bertanggung jawab atas hidrolisis xylan, tetapi enzim utama yang terlibat adalah endo-1,4-β-xilanase dan β-xylosidase. Ruminococcus Albus 7 adalah bakteri rumen yang mampu memetabolisme hemiselulosa dan selulosa, termasuk xylan, dan memiliki aplikasi potensial dalam depolimerisasi dinding sel tanaman. Genom mengkodekan beberapa hemis. Namun, endoxylanase dari R. albus 7 memiliki investigasi terbatas. Five Endoxylanase Genes, bernama XY4, XY5 XY6, XY8 dan XY9, milik GH10 dan GH11, telah dikloning menjadi vektor ekspresi PET-21A. Plasmid rekombinan diekspresikan di Escherichia coli BL21 (DE3). Protein fusi yang diungkapkan diperiksa oleh SDS-Page, pita spesifik sekitar 42,6 KDA, 46,7 KDA, 74 KDA, 89 KDA dan 89 KDA diperiksa masing-masing untuk setiap endoxylanase XY4, XY5, XY6, XY8 dan XY9, ketika diinduksi oleh IPTG. Aktivitas tertinggi SE Semua endoxylanase dapat ditemukan pada pH 6 sekitar 40-45 ° C. Analisis produk hidrolisis dengan menggunakan TLC, mengakibatkan bahwa, kombinasi SE Edoxylanase dapat meningkatkan efektivitas produksi xylooligosaccharide IV yang lebih kecil dari 6 unit monomer. Endoxylanase dari R. albus 7

English Abstract

Plant biomass as lignocellulosic material is major renewable carbon resource in earth. Much of this biomass is discarded as “waste”. Indonesia is world`s largest producer of coconut (Cocos nucifera) and oil palm (Elaeis guineensis), and generates a lot of lignocellulosic biomass besides of ir major products. It would be better if this lignocellulosic biomass can be convered into more valuable products. Xylan as second major part of lignocellulosic materials can be used to produce various value added products such as biofuels, animal feeds, chemicals and food additives such as xylooligosaccharide (XOS), xylitol, xylose, etc. XOS is indigestible food ingredient have been reported with many health benefits. Some enzymes produced by microorganisms are responsible for hydrolysis of xylan, but main involved enzymes are endo-1,4-β-xylanase and β-xylosidase. Ruminococcus albus 7 is a rumen bacterium capable metabolizing hemicellulose and cellulose, including xylan, and has potential applications in depolymerization of plant cell wall. genome encodes several hemicellulases. However, endoxylanases from R. albus 7 have limited investigation. Five endoxylanase genes, named xy4, xy5 xy6, xy8 and xy9, belong to GH10 and GH11, have been cloned into pET-21a expression vector. recombinant plasmids were expressed in Escherichia coli BL21(DE3). expressed fusion proteins were examined by SDS-PAGE, a specific band of about 42.6 kDa, 46.7 kDa, 74 kDa, 89 kDa and 89 kDa were examined for each endoxylanases Xy4, Xy5, Xy6, Xy8 and Xy9 respectively, when induced by IPTG. highest activity of se all endoxylanases could be found at pH 6 around 40-45°C. Analyses of hydrolysis products by using TLC, resulted that, combination of se endoxylanases could increase production effectivity of xylooligosaccharide smaller iv than 6 monomer units. Endoxylanases from R. albus 7

Item Type: Thesis (Magister)
Identification Number: TES/660.6/PUT/b/041401585
Subjects: 600 Technology (Applied sciences) > 660 Chemical engineering and related technologies > 660.6 Biotechnology
Divisions: S2/S3 > Magister Bioteknologi Perikanan dan Kelautan, Fakultas Perikanan dan Ilmu Kelautan
Depositing User: Budi Wahyono Wahyono
Date Deposited: 03 Jun 2014 15:18
Last Modified: 03 Jun 2014 15:18
URI: http://repository.ub.ac.id/id/eprint/160096
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