کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8333271 | 1540260 | 2013 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Biochemical and molecular characterization of Pseudomonas aeruginosa CTM50182 organic solvent-stable elastase
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
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چکیده انگلیسی
An extracellular alkaline elastase was produced from Pseudomonas aeruginosa CTM50182. It was chromatographically purified using HPLC and Mono Q Sepharose column. Matrix assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF/MS) analysis revealed that the purified enzyme (called AMPP) was a monomer with a molecular mass of 33,015.18 Da. The N-terminal 29 amino acid sequence of AMPP showed high homology with those of Pseudomonas elastases. It showed optimal activity at pH 12 and 80 °C and was stable at a pH range of 9-12 after 120 h of incubation. Its thermoactivity and thermostability were upgraded in the presence of 5 mM Co2+. Its half-life times at 70 and 80 °C were 16 and 10 h, respectively. It was completely inhibited by ethylene glycol-bis (β-aminoethyl ether)-N,N,Nâ²,Nâ²-tetraacetic acid (EGTA), and 1,10-phenanthroline, suggesting that it belongs to the metalloprotease family. AMPP also exhibited high catalytic efficiency, organic solvent-tolerance, and hydrolysis. The lasB gene encoding AMPP was cloned, sequenced, and expressed in Escherichia coli. The biochemical properties of the extracellular purified recombinant enzyme (rAMPP) were similar to those of native AMPP. This organic solvent-stable protease could be considered a potential candidate for application as a biocatalyst in the synthesis of enzymatic peptides.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Biological Macromolecules - Volume 60, September 2013, Pages 165-177
Journal: International Journal of Biological Macromolecules - Volume 60, September 2013, Pages 165-177
نویسندگان
Bassem Jaouadi, Nadia Zaraî Jaouadi, Hatem Rekik, Belgacem Naili, Abdelhamid Beji, Abdelhafidh Dhouib, Samir Bejar,