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Title: The Clostridium Sporulation Programs: Diversity and Preservation of Endospore Differentiation

Journal Article · · Microbiology and Molecular Biology Reviews
 [1];  [2];  [3]
  1. Univ. of Delaware, Newark, DE (United States); Sultan Qaboos Univ., Muscat (Oman)
  2. Elcriton Inc., New Castle, DE (United States)
  3. Elcriton Inc., New Castle, DE (United States); Univ. of Delaware, Newark, DE (United States)

Bacillus and Clostridium organisms initiate the sporulation process when unfavorable conditions are detected. The sporulation process is a carefully orchestrated cascade of events at both the transcriptional and posttranslational levels involving a multitude of sigma factors, transcription factors, proteases, and phosphatases. Like Bacillus genomes, sequenced Clostridium genomes contain genes for all major sporulation-specific transcription and sigma factors (spo0A, sigH, sigF, sigE, sigG, and sigK) that orchestrate the sporulation program. However, recent studies have shown that there are substantial differences in the sporulation programs between the two genera as well as among different Clostridium species. First, in the absence of a Bacillus-like phosphorelay system, activation of Spo0A in Clostridium organisms is carried out by a number of orphan histidine kinases. Second, downstream of Spo0A, the transcriptional and posttranslational regulation of the canonical set of four sporulation-specific sigma factors (σF, σE, σG, and σK) display different patterns, not only compared to Bacillus but also among Clostridium organisms. Finally, recent studies demonstrated that σK, the last sigma factor to be activated according to the Bacillus subtilis model, is involved in the very early stages of sporulation in Clostridium acetobutylicum, C. perfringens, and C. botulinum as well as in the very late stages of spore maturation in C. acetobutylicum. Despite profound differences in initiation, propagation, and orchestration of expression of spore morphogenetic components, these findings demonstrate not only the robustness of the endospore sporulation program but also the plasticity of the program to generate different complex phenotypes, some apparently regulated at the epigenetic level.

Research Organization:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
sc0007092
OSTI ID:
1454688
Journal Information:
Microbiology and Molecular Biology Reviews, Vol. 79, Issue 1; ISSN 1092-2172
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 114 works
Citation information provided by
Web of Science

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Effect of fermentation system on the physicochemical and microbial community dynamics during enset ( Ensete ventricosum ) fermentation journal January 2019
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Comparison of expression of key sporulation, solventogenic and acetogenic genes in C. beijerinckii NRRL B-598 and its mutant strain overexpressing spo0A journal October 2017
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