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Leafing Through Literature: Late Embryogenesis Abundant Proteins Coming Of Age – Achievements And Perspectives, Itzell E. Hernandez-Sanchez, Israel Maruri Lopez, Coral Martinez-Martinez, Brett Janis, Juan Francisco Jimenez Bremont, Alejandra A. Covarrubias, Michael A. Menze, Steffen P. Graether, Anja Thalhammer
Leafing Through Literature: Late Embryogenesis Abundant Proteins Coming Of Age – Achievements And Perspectives, Itzell E. Hernandez-Sanchez, Israel Maruri Lopez, Coral Martinez-Martinez, Brett Janis, Juan Francisco Jimenez Bremont, Alejandra A. Covarrubias, Michael A. Menze, Steffen P. Graether, Anja Thalhammer
Faculty Scholarship
To deal with increasingly severe periods of dehydration related to global climate change, it becomes increasingly important to understand the complex strategies many organisms have developed to cope with dehydration and desiccation. While it is undisputed that late embryogenesis abundant (LEA) proteins play a key role in the tolerance of plants and many anhydrobiotic organisms to water limitation, the molecular mechanisms are not well understood. In this review we recap the current knowledge of the physiological roles of LEA proteins and discuss their potential molecular functions. As these are ultimately linked to conformational changes in the presence of binding partners, …
Potential Functions Of Lea Proteins From The Brine Shrimp Artemia Franciscana - Anhydrobiosis Meets Bioinformatics., Brett Janis, Vladimir N. Uversky, Michael Menze
Potential Functions Of Lea Proteins From The Brine Shrimp Artemia Franciscana - Anhydrobiosis Meets Bioinformatics., Brett Janis, Vladimir N. Uversky, Michael Menze
Faculty Scholarship
Late embryogenesis abundant (LEA) proteins are a large group of anhydrobiosis-associated intrinsically disordered proteins (IDP), which are commonly found in plants and some animals. The brine shrimp Artemiafranciscana is the only known animal that expresses LEA proteins from three, and not only one, different groups in its anhydrobiotic life stage. The reason for the higher complexity in the A. franciscana LEA proteome (LEAome), compared with other anhydrobiotic animals, remains mostly unknown. To address this issue, we have employed a suite of bioinformatics tools to evaluate the disorder status of the ArtemiaLEAome and to analyze the roles of intrinsic disorder in …
Trehalose Uptake Through P2x7 Purinergic Channels Provides Dehydration Protection., Gloria Elliott, Jennifer Cusick, Xiang-Hong Liu, Michael Menze, Trudy Witt, Steven Hand, Mehmet Toner
Trehalose Uptake Through P2x7 Purinergic Channels Provides Dehydration Protection., Gloria Elliott, Jennifer Cusick, Xiang-Hong Liu, Michael Menze, Trudy Witt, Steven Hand, Mehmet Toner
Faculty Scholarship
The tetra-anionic form of ATP (ATP4-) is known to induce monovalent and divalent ion fluxes in cells that express purinergic P2X7 receptors (Steinberg et al., 1987; Sung et al., 1985), and with sustained application of ATP it has been shown that dyes as large as 831 daltons can permeate the cell membrane (Steinberg et al, 1987). The current study explores the kinetics of loading α,α-trehalose (342 daltons) into ATP stimulated J774.A1 cells, which are known to express the purinergic P2X7 receptor (Steinberg et al., 1987). Cells that were incubated at 37 ̊C in a 50 mM phosphate buffer (pH 7.0) …
Trehalose Loading Through The Mitochondrial Permeability Transition Pore Enhances Desiccation Tolerance In Rat Liver Mitochondria., Xiang-Hong Liu, Alptekin Aksan, Michael Menze, Steven Hand, Mehmet Toner
Trehalose Loading Through The Mitochondrial Permeability Transition Pore Enhances Desiccation Tolerance In Rat Liver Mitochondria., Xiang-Hong Liu, Alptekin Aksan, Michael Menze, Steven Hand, Mehmet Toner
Faculty Scholarship
Trehalose has extensively been used to improve the desiccation tolerance of mammalian cells. To test whether trehalose improves desiccation tolerance of mammalian mitochondria, we introduced trehalose into the matrix of isolated rat liver mitochondria by reversibly permeabilizing the inner membrane using the mitochondrial permeability transition pore (MPTP). Measurement of the trehalose concentration inside mitochondria using high perfOrmance liquid chromatography showed that the sugar permeated rapidly into the matrix upon opening the MPTP. The concentration of intra matrix trehalose reached 0.29 mmoVmg protein (-190 mM) in 5 min. Mitochondria, with and without trehalose loaded into the matrix, were desiccated in a …