Screening of hy droly tic extremoz y mes in haloalkali ph ilic Archaea by culture and molec ular -bas ed m ethods ABSTRACT:Exploring of extrem ophilic Archaea and their enzym es had great significance to biocatalysis. Enzym es produced by Archaea allow im provem ent in m ultiple sectors of industry. They can help reduce the quantity of w aste energy and material consumption, thus m aking the technology m ore environm entally-friendly. This study aim ed to screen hydrolytic extrem ozym es in different Soda Lakes of W adi Al-Natrun, Egypt, by enzym atic agar -plate assays and m olecular-based m ethods. Five hundred and thirty-five haloalkaliphilic archaeal strains isolated from different Soda Lakes w ere screened for production of protease, am ylase, pectinase, chitinase, cellulase, lipase and esterase at pH 10 and 25% NaCl (w /v). Furtherm ore, m etagenomic DNA w as extracted from w ater sam ple of Ga'ar Lake and constructed library w ere sequenced to identify the genes encoding target enzymes by using illum ina Hiseq2000 system . By enzym atic agarplate assay, all tested strains show ed potential production of extracellular enzym es, a total of 39.4% of screened strains produced protease, 27.1% show ed am ylase activity, 25.9% for lipase and 7.4% displayed cellulase activity, but none of tested strains produced chitinase or pectinase. W hile, by shotgun m etagenomic technique, all genes encoding m etabolically active hydrolytic enzym es studied w er e detected in water sam ple of Ga'ar Soda Lake. Metagenome-derived DNA libraries have focused on m any classes of enzym es, am ong these hydrolytic enzym es were prominent. The results of both m ethods indicated that these soda lakes are rich w ith commercially valuable enzym es.
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