کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8360323 1542334 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Expression, refolding, purification and crystallization of the sensory domain of the TlpC chemoreceptor from Helicobacter pylori for structural studies
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Expression, refolding, purification and crystallization of the sensory domain of the TlpC chemoreceptor from Helicobacter pylori for structural studies
چکیده انگلیسی
Helicobacter pylori infections are associated with gastritis, duodenal and gastric ulcers and gastric adenocarcinoma. Bacterial chemotaxis, mediated by four different chemoreceptors (also termed transducer-like proteins (Tlp)), plays an important role in initial colonization and development of disease. Chemoreceptor sensory domains of H. pylori share no significant sequence similarity with those of Escherichia coli or any other non-Epsilonproteobacteria. The structural basis of how chemical signals are recognized by chemoreceptors of H. pylori is poorly understood mainly due to the lack of a robust procedure to purify their sensory domains in a soluble form. This study reports a method for extraction of the periplasmic sensory domain of transducer-like protein C (TlpC) from inclusion bodies and refolding to yield 5 mg pure crystallizable protein per 1 l of bacterial culture. Purified protein was monomeric in solution by size-exclusion chromatography and folded according to the circular dichroism spectrum. Crystals have been grown by the hanging-drop vapor-diffusion method using PEG 4000 as a precipitating agent. The crystals belonged to space group C2, with unit-cell parameters a = 189.3, b = 103.2, c = 61.8 Å, β = 98.3. A complete X-ray diffraction data set has been collected to 2.2 Å resolution using cryocooling conditions and synchrotron radiation. Self-rotation function and Matthews coefficient calculations suggest that the asymmetric unit contains three monomers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Protein Expression and Purification - Volume 107, March 2015, Pages 29-34
نویسندگان
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