Mark S Turner, Yuwei Xiang, Zhao-Xun Liang, Esteban Marcellin, Huong Thi Pham
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Cyclic dimeric adenosine monophosphate (cyclic-di-AMP) is a nucleotide second messenger present in Gram-positive bacteria, Gram-negative bacteria and some Archaea. The intracellular concentration of cyclic-di-AMP is adjusted in response to environmental and cellular cues, primarily through the activities of synthesis and degradation enzymes. It performs its role by binding to protein and riboswitch receptors, many of which contribute to osmoregulation. Imbalances in cyclic-di-AMP can lead to pleiotropic phenotypes, affecting aspects such as growth, biofilm formation, virulence, and resistance to osmotic, acid, and antibiotic stressors. This review focuses on cyclic-di-AMP signalling in lactic acid bacteria (LAB) incorporating recent experimental discoveries and presenting a genomic analysis of signalling components from a variety of LAB, including those found in food, and commensal, probiotic, and pathogenic species. All LAB possess enzymes for the synthesis and degradation of cyclic-di-AMP, but are highly variable with regards to the receptors they possess. Studies in Lactococcus and Streptococcus have revealed a conserved function for cyclic-di-AMP in inhibiting the transport of potassium and glycine betaine, either through direct binding to transporters or to a transcriptional regulator. Structural analysis of several cyclic-di-AMP receptors from LAB has also provided insights into how this nucleotide exerts its influence.
期刊介绍:
Title: FEMS Microbiology Reviews
Journal Focus:
Publishes reviews covering all aspects of microbiology not recently surveyed
Reviews topics of current interest
Provides comprehensive, critical, and authoritative coverage
Offers new perspectives and critical, detailed discussions of significant trends
May contain speculative and selective elements
Aimed at both specialists and general readers
Reviews should be framed within the context of general microbiology and biology
Submission Criteria:
Manuscripts should not be unevaluated compilations of literature
Lectures delivered at symposia must review the related field to be acceptable