Special Issue "Signaling Molecules: Hydrogen Sulfide and Polysulfide"
Deadline for manuscript submissions: 28 February 2019
Prof. Dr. Claus Jacob
During the last decade, various inorganic polysulfides (H2Sx, x ≥ 2) have emerged as potential and potent cellular signalling molecules. Numerous (bio)chemical reactions and biological activities have been ascribed to these astonishingly simple reactive sulfur species (RSS), ranging from chemopreventive and antioxidant properties to intricate posttranslational protein modifications and redox signalling. There is even some evidence that such molecules may modulate the intracellular redox status and induce apoptosis in selected target cells.
Indeed, whilst inorganic polysulfides are—chemically speaking—among the most “primitive” molecules, i.e. sulfur chains composed exclusively of sulfur and some hydrogen, their reactivity resembles the one of H2S on the one side and that of organic polysulfides/polysulfanes (RSxR, x > 2), such as the diallylsulfanes from garlic, on the other. An unassuming molecule such as S22-, for instance, is a fine reducing agent and a ligand for metal ions, just like H2S; still, it is also an oxidant able to modify cysteine residues via S-thiolation. There has even been some suspicion that the biochemistry assigned traditionally to H2S in part may be one of these polysulfides.
Undoubtedly, the biological activities of polysulfides are highly complicated, and we are just at the beginning of understanding some of them. Since these RSS are intrinsically difficult to detect, especially in complex biological environments, such investigations are inherently tedious and often marred by artefacts. Still, there has been notable progress in the analytics as well as the redox biology of H2Sx over the years, and it is now a good time to take stock of the present knowledge and look at future developments in this emerging field. As part of this Special Issue, chemistry and biochemistry will join up to solve some of the challenges of sulfur redox biology, from the appearance, activities, and possible applications of H2S and H2Sx to the interactions of such species with thiols, disulfides, selenium, cysteine proteins, and redox signalling via the cellular thiolstat.
Prof. Dr. Claus Jacob
Manuscript Submission Information
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- cellular thiolstat
- Reactive Sulfur Species
- redox modulation
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: From Elemental Sulfur to Hydrogen Sulfide in Agricultural Soils and Plants.
Author: Adalberto Benavides-Mendoza
Affiliation: Departamento de Horticultura, Universidad Autónoma Agraria Antonio Narro, Saltillo 25315, Coahuila, Mexico; firstname.lastname@example.org
Abstract: Sulfur is an essential element in determining the productivity and quality of agricultural products. It is also an element associated with tolerance to biotic and abiotic stress in plants. In agricultural practice, sulfur has broad use in the form of sulfate fertilizer and, to a lesser extent, as sulfite biostimulant. When used in the form of bulk elemental sulfur, or micro-or nano-sulfur, applied both to the soil and to the canopy, the element undergoes a series of changes in the oxidation state, produced by various intermediaries (S+2 --> S+5) that act apparently as biostimulants and promoters of stress tolerance. The final result is sulfate S+6 which is the source of sulfur that all soil organisms assimilate and that plants absorb by the radical cells. The changes in the oxidation states of sulfur S0 to S6 depends on the action of specific groups of edaphic bacteria. In plant cells, S+6 sulfate is reduced to S-2 and incorporated into biological molecules. S-2 is also absorbed by stomata from H2S, COS, and other atmospheric sources. S-2 is the precursor of polysulfides and H2S whose action as cell signaling and biostimulants has been described in plants. S-2 is also the basis of essential biological molecules in signaling, metabolism and stress tolerance such as SAM, glutathione, and phytochelatins. The present review describes the dynamics of sulfur in soil and plants, considering as the starting point the elemental sulfur and as a final point, the sulfur accumulated as S-2 in the biological structures. The factors that modify the behavior of the different components of the sulfur cycle in the soil-plant-atmosphere system are described and how these influence the productivity, quality and stress tolerance of crops. The internal and external factors that influence the cellular production of S-2 and polysulfides vs. other S species are also described. The impact of elemental sulfur is compared with that of sulfates, in a context of proper soil management. The conclusion is that the use of elemental sulfur is recommended over that of sulfates, since it is beneficial for the soil microbiome, for the productivity and nutritional quality of the crops, also allowing to increase the tolerance of plants to environmental stresses.
Title: Hydrogen sulfide modulation of Arabidopsis transcriptome
Author: Cecilia Gotor
Affiliation: Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, Sevilla, Spain; email@example.com
Abstract: Hydrogen sulfide is endogenously produced and metabolized by cells in a precise and regulated manner. Both in animal and plant systems, the concept of sulfide has been changed from a toxic molecule to a signaling molecule of the same importance as carbon monoxide, nitric oxide and hydrogen peroxide. In plants, hydrogen sulfide plays important roles mediating the tolerance and protection against several stresses that hinder plant development. Hydrogen sulfide also regulates essential processes for plant performance, such as photosynthesis, senescence, stomatal movement and autophagy. We have performed a comparative transcriptomic analysis on leaves of Arabidopsis plants grown under non-stress conditions and exogenously treated with NaHS. We observe a significant alteration of the transcriptional profile and bioinformatic analyses reveal that hydrogen sulfide regulates a wide range of metabolic pathways at the transcriptional level.
Title:Hydrogen sulfide (H2S), polysulfides (H2Sn) and S-sulfuration of their targets
Affiliation:National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi, Kodaira Tokyo 187-8502, Japan; firstname.lastname@example.org
Abstract: Hydrogen sulfide (H2S) is a signaling molecule to play physiological roles such as neuromodulation, vascular tone regulation, cytoprotection and so on. Hydrogen polysulfuides (H2Sn) were recently identified in the brain and regulates ion channels, tumor growth, vascular tone, and redox signaling via S-sulfuration of these target protains. H2S and H2Sn are produced by 3-mercaptopyruvate sulfurtransferase (3MST), which also generate cysteine- and glutathione-persulfide. The chemical interaction of H2S and nitric oxide (NO) produces H2Sn that may provide a mechanism for the synergistic effect of H2S with NO previously observed. This review article focuses on the recent progress in the study of signaling by these persulfurated molecules as well as H2S.