4.4 Article

A Rationally Designed c-di-AMP Forster Resonance Energy Transfer Biosensor To Monitor Nucleotide Dynamics

期刊

JOURNAL OF BACTERIOLOGY
卷 203, 期 19, 页码 -

出版社

AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.00080-21

关键词

biosensor; crystal structure; DRaCALA; FACS; FRET; protein engineering; single cell; c-di-AMP; Imo0553

资金

  1. Public Health Service, National Research Service, Award [T32GM007270]
  2. National Institute of General Medical Sciences
  3. National Institutes of Health [1R21AI137758, 1R21AI153820, AI116669]

向作者/读者索取更多资源

c-di-AMP is a crucial nucleotide second messenger in bacteria, regulating various cellular processes. The development of a novel biosensor, CDA5, enables the detection of c-di-AMP dynamics within bacterial populations at single-cell resolution, providing valuable insights into its regulation.
3'3'-Cyclic di-AMP (c-di-AMP) is an important nucleotide second messenger found throughout the bacterial domain of life. c-di-AMP is essential in many bacteria and regulates a diverse array of effector proteins controlling pathogenesis, cell wall homeostasis, osmoregulation, and central metabolism. Despite the ubiquity and importance of c-di-AMP, methods to detect this signaling molecule are limited, particularly at single-cell resolution. In this work, crystallization of the Listeria monocytogenes c-di-AMP effector protein Lmo0553 enabled structure-guided design of a Forster resonance energy transfer (FRET)-based biosensor, which we have named CDA5. CDA5 is a fully genetically encodable, specific, and reversible biosensor which allows the detection of c-diAMP dynamics both in vitro and within live cells in a nondestructive manner. Our initial studies identified a distribution of c-di-AMP in Bacillus subtilis populations first grown in Luria broth and then resuspended in diluted Luria broth compatible with fluorescence analysis. Furthermore, we found that B. subtilis mutants lacking either a c-di-AMP phosphodiesterase and cyclase have higher and lower FRET responses, respectively. These findings provide novel insight into the c-di-AMP distribution within bacterial populations and establish CDA5 as a powerful platform for characterizing new aspects of c-di-AMP regulation. IMPORTANCE c-di-AMP is an important nucleotide second messenger for which detection methods are severely limited. In this work we engineered and implemented a c-di-AMP-specific FRET biosensor to remedy this dearth. We present this biosensor, CDA5, as a versatile tool to investigate previously intractable facets of c-di-AMP biology.

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