The spore coat is essential for Bacillus subtilis spore resistance to pulsed light, and pulsed light treatment eliminates some spore coat proteins

Clair, Geremy CD; Esbelin, Julia; Mallea, Sabine; Bornard, Isabelle; Carlin, Frederic

doi:10.1016/j.ijfoodmicro.2020.108592

Title: The spore coat is essential for Bacillus subtilis spore resistance to pulsed light, and pulsed light treatment eliminates some spore coat proteins

Journal Article · Tue Mar 17 00:00:00 EDT 2020 · International Journal of Food Microbiology

DOI:https://doi.org/10.1016/j.ijfoodmicro.2020.108592· OSTI ID:1631308

^[1]; Esbelin, Julia ^[2]; Mallea, Sabine ^[2]; Bornard, Isabelle ^[2];

^[2]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Avignon Univ. (France)

Microbial surface contamination of equipment or of food contact material is a recurring problem in the food industry. Spore-forming bacteria are far more resistant to a wide variety of treatments than their vegetative forms. Understanding the mechanisms underlying decontamination processes is needed to improve surface decontamination strategies against endospores potentially at the source of foodborne diseases or food-spoilage. Pulsed light (PL) with xenon lamps delivers high-energy short-time pulses of light with wavelengths in the range 200 nm-1100 nm and a high UV-C fraction. Bacillus subtilis spores were exposed to either PL or to continuous UV-C. Gel electrophoresis and western blotting revealed elimination of various proteins of the spore coat, an essential outer structure that protects spores from a wide variety of environmental conditions and inactivation treatments. Proteomic analysis confirmed the elimination of some spore coat proteins after PL treatment. Transmission electron microscopy of PL treated spores revealed a gap between the lamellar inner spore coat and the outer spore coat. Overall, spores of mutant strains with defects in genes coding for spore coat proteins were more sensitive to PL than to continuous UV-C. This study demonstrates that radiations delivered by PL contribute to specific damage to the spore coat, and overall to spore inactivation. Keywords Decontamination, UV, proteins, proteomics, microscopy Journal Pre-proof

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1631308

Report Number(s):: PNNL-SA-152796

Journal Information:: International Journal of Food Microbiology, Vol. 323, Issue C; ISSN 0168-1605

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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