کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5372304 | 1503983 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal denaturations of staphylococcal nuclease wild-type and mutants monitored by fluorescence and circular dichroism are similar: Lack of evidence for other than a two state thermal denaturation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Thermal denaturations of staphylococcal nuclease wild-type and mutants monitored by fluorescence and circular dichroism are similar: Lack of evidence for other than a two state thermal denaturation Thermal denaturations of staphylococcal nuclease wild-type and mutants monitored by fluorescence and circular dichroism are similar: Lack of evidence for other than a two state thermal denaturation](/preview/png/5372304.png)
چکیده انگلیسی
It is unclear whether the thermal denaturation of staphylococcal nuclease is a two state, three state, or variable two state process. The thermal denaturation of wild-type staphylococcal nuclease was followed by tryptophan fluorescence and circular dichroism signal at 222 nm, forty-two and fourteen times, respectively. Analysis of this data using a simple two state model gave melting temperatures of 53.0 ± 0.4 °C (fluorescence) and 52.7 ± 0.6 °C (CD) and van't Hoff enthalpies of 82.4 ± 2.6 kcal/mol and 88.6 ± 4.2 kcal/mol. Ninety-seven mutants also had these parameters determined by both fluorescence and CD. The average difference between the melting temperatures was 1.05 ± 0.75° and the average difference between van't Hoff enthalpies was 1.6 ± 4.8 kcal/mol. These very similar results for the two spectroscopic probes of structure are discussed in the context of the different models that have been proposed for nuclease denaturation. It is concluded, for most nuclease variants, that the errors introduced by a two state assumption are negligible and either virtually all helical structure is lost in any initial unfolding event or any intermediate must have low stability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biophysical Chemistry - Volume 125, Issues 2â3, February 2007, Pages 490-496
Journal: Biophysical Chemistry - Volume 125, Issues 2â3, February 2007, Pages 490-496
نویسندگان
Michael P. Byrne, Wesley E. Stites,