PreprintCited by 7Bacterial biofilms and quorum sensingBacterial Genetics and BiotechnologyPhosphodiesterase function and regulation

ComFB, a new widespread family of c-di-NMP receptor proteins

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Samir, Sherihan, Elshereef, Abdalla A., Alva, Vikram, Hahn, Jeanette, Dubnau, David, Galperin, Michael Y., Selim, Khaled A.·2024·Proceedings of the National Academy of Sciences

Preprint — published as 10.1073/pnas.2513041122

Abstract

Cyclic dimeric GMP (c-di-GMP) is a widespread bacterial second messenger that controls a variety of cellular functions, including protein and polysaccharide secretion, motility, cell division, cell development, and biofilm formation, and contributes to the virulence of some important bacterial pathogens. While the genes for diguanylate cyclases and c-di-GMP hydrolases (active or mutated) can be easily identified in microbial genomes, the list of c-di-GMP receptor domains is quite limited, and only two of them, PliZ and MshEN, are found across multiple bacterial phyla. Recently, a new c-di-GMP receptor protein, named CdgR or ComFB, has been identified in cyanobacteria and shown to regulate their cell size and, more recently, natural competence. Sequence and structural analysis indicated that CdgR is part of a widespread ComFB protein family, named after the “late competence development protein ComFB” from Bacillus subtilis . This prompted the suggestion that ComFB and ComFB-like proteins could also be c-di-GMP receptors. Indeed, we revealed that ComFB proteins from Gram-positive B. subtilis and Thermoanaerobacter brockii were able to bind c-di-GMP with high-affinity. The ability to bind c-di-GMP was also demonstrated for the ComFB proteins from clinically relevant Gram-negative bacteria Vibrio cholerae and Treponema denticola . These observations indicate that the ComFB family serves as yet another widespread family of bacterial c-di-GMP receptors. Incidentally, some ComFB proteins were also capable of c-di-AMP binding, identifying them as a unique family of c-di-NMP receptor proteins. The overexpression of comFB in B. subtilis, combined with an elevated concentration of c-di-GMP, suppressed motility, attesting to the biological relevance of ComFB as a c-di-GMP binding protein. IMPORTANCE: The cellular content of the bacterial second messenger c-di-GMP is controlled by c-di-GMP synthases (GGDEF domains) and hydrolases (EAL or HD-GYP domains), whose activities, in turn, respond to the signals perceived by their upstream sensory domains. Cyclic-di-GMP transmits the signals to a variety of its targets, which may contain inactivated GGDEF, EAL, or HD-GYP domains, widespread PilZ or MshEN domains, or various lineage-specific c-di-GMP receptors. Many organisms encode multiple GGDEF domains but few c-di-GMP-binding proteins, suggesting the existence of still unidentified c-di-GMP receptors. Here, we demonstrate that the ComFB family proteins, which include the recently characterized cyanobacterial CdgR/ComFB, constitute yet another widespread family of bacterial c-di-NMP receptors. We additionally show that ComFB controls bacillar motility in a c-di-GMP-dependent manner.

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  1. 10.1101/2023.1108.1110.552651 · DOI
  2. 10.1101/2023.1111.1114.567006 · DOI

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Authors
Samir, S., Elshereef, A. A., Alva, V., Hahn, J., Dubnau, D., Galperin, M. Y., & Selim, K. A.
Affiliations
  • Ain Shams University (EG)
  • National Research Centre (EG)
  • Max Planck Institute for Biology (DE)
  • Rutgers, The State University of New Jersey (US)
  • National Institutes of Health (US)
  • Heinrich Heine University Düsseldorf (DE)
Corresponding author
Selim, Khaled A.
Venue
Proceedings of the National Academy of Sciences
Publisher
openRxiv
Published
2024-11-10
Volume
122
Issue
38
Pages
e2513041122-e2513041122
ISSN
0027-8424 (ISSN-L)
OpenAlex
W4414322116
Cited by
7
References
98
Citations by year
2026: 4 · 2025: 3
FWCI
2.11
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion, cc-by-nc-nd)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (submittedVersion, cc-by-nc-nd)
  • Universitätsbibliothek Tübingen
Funders
  • Deutsche Forschungsgemeinschaft (SFB1381, SE 3449/3‐1, SPP 2389, EXC 2124, 390838134, 403222702)
  • Huazhong Agricultural University
  • Norsk Romsenter
  • National Institutes of Health (Z01 LM000061)
  • National Institute of General Medical Sciences (R15GM123487, R01GM057720)
  • U.S. National Library of Medicine (Z01LM000073)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bacterial biofilms and quorum sensing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Phosphodiesterase function and regulation
Keywords
c-di-GMP, c-di-AMP, bacterial second messenger, bacterial motility, natural competence, cell size control, Bacillus subtilis, Shewanella oneidensis, Vibrio cholerae, Treponema denticola, Thermoanaerobacter brockii, protein evolution

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