کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8329675 | 1540228 | 2016 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Purification and characterization of laccase from Sinorhizobium meliloti and analysis of the lacc gene
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موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
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چکیده انگلیسی
The soil native bacterial strains were screened for laccase activity. Bacterial strain L3.8 with high laccase activity was identified as Sinorhizobium meliloti. The crude intracellular L3.8 enzyme extract was able to oxidize typical diagnostic substrates of plant and fungal laccases. Laccase L3.8 was purified 81-fold with a yield of 19.5%. The molecular mass of the purified bacterial laccase was found to be 70.0Â kDa and its pI was 4.77. UV-vis spectrum showed that L3.8 protein is a multicopper oxidase. The carbohydrate content of the purified enzyme was estimated at 3.2%. Moreover, the laccase active fraction was characterized in terms of kinetics, temperature, and pH optima as well as the effect of various chemical compounds on the laccase activity, and antioxidant properties, which indicated that the L3.8 laccase had unique properties that might be important in biotechnological applications. The lacc gene encoding S. meliloti laccase was cloned and characterized. The full-length sequence of 1950Â bp encoded a protein of 649 aa preceded by a signal peptide consisting of 26Â aa. Laccase L3.8 shared significant structural features characteristic of other laccases, including the conserved regions of four histidine-rich copper-binding sites. Potential biotechnological importance of a newly identified laccase is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Biological Macromolecules - Volume 92, November 2016, Pages 138-147
Journal: International Journal of Biological Macromolecules - Volume 92, November 2016, Pages 138-147
نویسندگان
Anna Pawlik, Magdalena Wójcik, Karol RuÅka, Karolina Motyl-Gorzel, Monika OsiÅska-Jaroszuk, Jerzy Wielbo, Monika Marek-Kozaczuk, Anna Skorupska, Jerzy Rogalski, Grzegorz Janusz,