Journal
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
Volume 32, Issue 2, Pages -Publisher
SPRINGER
DOI: 10.1007/s11274-015-1983-2
Keywords
Inorganic polyphosphate; Cation chelator; Nutrient deficiency; Stress protection; Cell signaling; Chemical chaperone
Categories
Funding
- Spanish Regional Government [BFU2004-00843, BFU2007-61887, BFU2010-15622]
- Andalusian Regional (PAIDI group) Government [BIO-261]
- EU FEDER program
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Inorganic polyphosphates (polyP) are linear polymers of tens to hundreds orthophosphate residues linked by phosphoanhydride bonds. These fairly abundant biopolymers occur in all extant forms of life, from prokaryotes to mammals, and could have played a relevant role in prebiotic evolution. Since the first identification of polyP deposits as metachromatic or volutin granules in yeasts in the nineteenth century, an increasing number of varied physiological functions have been reported. Due to their high energy'' bonds analogous to those in ATP and their properties as polyanions, polyP serve as microbial phosphagens for a variety of biochemical reactions, as a buffer against alkalis, as a storage of Ca2+ and as a metal-chelating agent. In addition, recent studies have revealed polyP importance in signaling and regulatory processes, cell viability and proliferation, pathogen virulence, as a structural component and chemical chaperone, and as modulator of microbial stress response. This review summarizes the current status of knowledge and future perspectives of polyP functions and their related enzymes in the microbial world.
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