کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
17176 42649 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Two novel GH11 endo-xylanases from Myceliophthora thermophila C1 act differently toward soluble and insoluble xylans
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Two novel GH11 endo-xylanases from Myceliophthora thermophila C1 act differently toward soluble and insoluble xylans
چکیده انگلیسی


• Intrafamily differences are found for C1 GH11 endo-xylanases.
• GH11 endo-xylanases are influenced by solubility and molecular structure of xylan.
• Valine instead of tyrosine at position 163 causes GH10-like degradation products.
• GH11 xylanases release many small degradation products from self-associated xylans.

Two novel GH11 endo-xylanases from Myceliophthora thermophila C1 (C1), Xyl7 and Xyl8, were purified and the influence of solubility and molecular structure of various xylans on their efficiency was investigated. Both endo-xylanases were hindered by a high degree of substitution of a xylan. The two GH11 xylanases released different products from the xylans, in which Xyl7 displayed a degradation product composition closer to GH10 xylanases. A correlation of the degradation product composition with a specific residue at position 163 in the amino acid sequence of Xyl8 is suggested: tyrosine in Xyl8; valine in Xyl7. This is confirmed with examples of various endo-xylanases reported in literature.The C1 GH11 xylanases were more efficient on self-associated xylan compared to C1 GH10 endo-xylanases and they released more small xylooligomers from these xylans. This is contrary to the general assumption that GH10 xylanases degrade xylans to a higher degree than GH11 xylanases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Enzyme and Microbial Technology - Volume 53, Issue 1, 10 June 2013, Pages 25–32
نویسندگان
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