کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5913753 | 1162701 | 2015 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dormant Bacillus spores protect their DNA in crystalline nucleoids against environmental stress
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شناسی مولکولی
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چکیده انگلیسی
Bacterial spores of the genera Bacillus and Clostridium are extremely resistant against desiccation, heat and radiation and involved in the spread and pathogenicity of health relevant species such as Bacillus anthracis (anthrax) or Clostridium botulinum. While the resistance of spores is very well documented, underlying mechanisms are not fully understood. In this study we show, by cryo-electron microscopy of vitreous sections and particular resin thin section electron microscopy, that dormant Bacillus spores possess highly ordered crystalline core structures, which contain the DNA, but only if small acid soluble proteins (SASPs) are present. We found those core structures in spores of all Bacillus species investigated, including spores of anthrax. Similar core structures were detected in Geobacillus and Clostridium species which suggest that highly ordered, at least partially crystalline core regions represent a general feature of bacterial endospores. The crystalline core structures disintegrate in a period during spore germination, when resistance against most stresses is lost. Our results suggest that the DNA is tightly packed into a crystalline nucleoid by binding SASPs, which stabilizes DNA fibrils and protects them against modification. Thus, the crystalline nucleoid seems to be the structural and functional correlate for the remarkable stability of the DNA in bacterial endospores.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Biology - Volume 191, Issue 2, August 2015, Pages 156-164
Journal: Journal of Structural Biology - Volume 191, Issue 2, August 2015, Pages 156-164
نویسندگان
Christin Dittmann, Hong-Mei Han, Markus Grabenbauer, Michael Laue,