کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
18688 42735 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of the presence of aspartic proteases from Centaurea calcitrapa during seed germination
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Evaluation of the presence of aspartic proteases from Centaurea calcitrapa during seed germination
چکیده انگلیسی

Aspartic proteinases are present in a variety of organisms including plants. Common features of aspartic proteases include an active site cleft that contains two catalytic aspartic residues, acid pH optima for enzymatic activity, inhibition by pepstatin A. Plant aspartic proteinases occur in seeds and may be involved in the processing of storage proteins. Many of them have been purified and characterized. The presence of aspartic proteases in seeds of Centaurea calcitrapa during germination was investigated by measuring the activity on enzyme extracts. The aspartic proteases are present mainly in the beginning of seed germination suggesting that they could initiate the degradation of protein reserves in germinating seeds.These proteases were purified by salt precipitation followed by anion-exchange chromatography. Purified aspartic proteases have an optimal pH between 3.5 and 4.5, using FTC-hemoglobin as substrate and an optimal temperature at 52 °C. The ability of seed extracts for milk clotting was tested and the clotting time that was achieved is in the same range found for flower extracts appropriated for special cheeses in which weak clotting agents are required.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Enzyme and Microbial Technology - Volume 38, Issue 7, 2 May 2006, Pages 893–898
نویسندگان
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