The ice-nucleating bacterium Pantoea ananas KUIN-3 accumulated glucose in cells following a shift in temperature (10 degrees C) from the optimum growth temperature (30 degrees C). This accumulation might be caused by the activation of glucose-6-phosphatase. Although this strain after culturing at 30 degrees C was harmed by freezing, the cryotolerance of this strain was reached about 80% after cold acclimation at 10 degrees C.
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http://dx.doi.org/10.1271/bbb.66.866 | DOI Listing |
J Phys Chem C Nanomater Interfaces
December 2024
Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Ice-nucleating proteins (INPs) from bacteria like are among the most effective ice nucleators known. However, large INP aggregates with maximum ice nucleation activity (at approximately -2 °C) typically account for less than 1% of the overall ice nucleation activity in bacterial samples. This study demonstrates that polyols significantly enhance the assembly of INPs into large aggregates, dramatically improving bacterial ice nucleation efficiency.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
October 2024
Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Mainz 55128, Germany.
Bacterial ice nucleating proteins (INPs) are exceptionally effective in promoting the kinetically hindered transition of water to ice. Their efficiency relies on the assembly of INPs into large functional aggregates, with the size of ice nucleation sites determining activity. Experimental freezing spectra have revealed two distinct, defined aggregate sizes, typically classified as class A and C ice nucleators (INs).
View Article and Find Full Text PDFRecent Pat Biotechnol
October 2024
Department of Basic Sciences, College of Forestry, Dr. YSP University of Horticulture & Forestry Nauni, Solan, Himachal Pradesh -173230, India.
The Earth's climate is influenced by both natural phenomena (solar fluctuations, oceanic patterns, volcanic eruptions, and tectonic movements) and human activities (deforestation, CO and CO2 emissions, and desertification), all of which contribute to ongoing climate change and the resulting global warming. However, human actions are a major factor in exacerbating global warming and amplifying its adverse impacts worldwide. .
View Article and Find Full Text PDFInt J Biol Macromol
August 2024
Faculty of Biological Science, Akwa-Ibom State University, Akwa-Ibom State, Uyo 1167, Nigeria; College of Food Science and Engineering, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China. Electronic address:
Microorganisms' ice-binding structures (IBS) are macromolecules with potential commercial value in agriculture, food technology, material technology, cryobiology, and medicine. Microbial ice-structuring or microbial ice-binding particles, with their multi-applications, are simple to use, effective in low amounts, non-toxic, and environmentally friendly. Due to their source and composition diversities, microbial ice-binding structures are gaining attention because they are useable in various conditions.
View Article and Find Full Text PDFSci Adv
July 2024
Department of Chemistry, University of British Columbia, Vancouver, Canada.
Ice-nucleating proteins (INpro) trigger the freezing of supercooled water droplets relevant to atmospheric, biological, and technological applications. The high ice nucleation activity of INpro isolated from the bacteria could be linked to the aggregation of proteins at the bacterial membrane or at the air-water interface (AWI) of droplets. Here, we imaged freezing onsets, providing direct evidence of these proposed mechanisms.
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