Unveiling the Secrets of Calcium-Dependent Proteins in Plant Growth-Promoting Rhizobacteria: An Abundance of Discoveries Awaits
2023
Betina Cecilia Agaras | Cecilia Eugenia María Grossi | Rita María Ulloa
The role of Calcium ions (Ca<sup>2+</sup>) is extensively documented and comprehensively understood in eukaryotic organisms. Nevertheless, emerging insights, primarily derived from studies on human pathogenic bacteria, suggest that this ion also plays a pivotal role in prokaryotes. In this review, our primary focus will be on unraveling the intricate Ca<sup>2+</sup> toolkit within prokaryotic organisms, with particular emphasis on its implications for plant growth-promoting rhizobacteria (PGPR). We undertook an in silico exploration to pinpoint and identify some of the proteins described in the existing literature, including prokaryotic Ca<sup>2+</sup> channels, pumps, and exchangers that are responsible for regulating intracellular Calcium concentration ([Ca<sup>2+</sup>]<sub>i</sub>), along with the Calcium-binding proteins (CaBPs) that play a pivotal role in sensing and transducing this essential cation. These investigations were conducted in four distinct PGPR strains: <i>Pseudomonas chlororaphis</i> subsp. <i>aurantiaca</i> SMMP3, <i>P. donghuensis</i> SVBP6, <i>Pseudomonas</i> sp. BP01, and <i>Methylobacterium</i> sp. 2A, which have been isolated and characterized within our research laboratories. We also present preliminary experimental data to evaluate the influence of exogenous Ca<sup>2+</sup> concentrations ([Ca<sup>2+</sup>]<sub>ex</sub>) on the growth dynamics of these strains.
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