کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2021815 1069264 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Production and purification of the bacterial autolysin N-acetylmuramoyl-l-alanine amidase B from Pseudomonas aeruginosa
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Production and purification of the bacterial autolysin N-acetylmuramoyl-l-alanine amidase B from Pseudomonas aeruginosa
چکیده انگلیسی
The bacterial cell wall heteropolymer peptidoglycan is not a static structure as it is constantly being made and recycled throughout the bacterium's life cycle. This turnover of peptidoglycan is a highly coordinated event involving a complement of autolytic enzymes that include those with specificity for either the carbohydrate or the peptide linkages of peptidoglycan. One major class of these autolysins are the N-acetylmuramoyl-l-alanine amidases which cleave the amide linkage between the stem peptides and the lactyl moiety of muramoyl residues. They are required in the periplasm for cell separation during division and in both the periplasm and cytoplasm to trim soluble released PG fragments during turnover for recycling. The gene encoding N-acetylmuramoyl-l-alanine amidase B in Pseudomonas aeruginosa was cloned and over-expressed in Escherichia coli. The recombinant protein with a C-terminal His-tag was purified to apparent homogeneity by a combination of affinity and cation-exchange chromatographies using Ni2+NTA-agarose and Source S, respectively. Four separate assays involving zymography, light scattering, HPLC and MALDI-TOF mass spectrometry were used to confirm the activity of the protein as an N-acetylmuramoyl-l-alanine amidase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Protein Expression and Purification - Volume 56, Issue 1, November 2007, Pages 128-137
نویسندگان
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