Abstract
Bacteria produce various d-amino acids, including non-canonical d-amino acids, to adapt to environmental changes and overcome a variety of threats. These d-amino acids are largely utilized as components of peptidoglycan, and they promote peptidoglycan remodeling and biofilm disassembly. The biosynthesis, maturation, and recycling of peptidoglycan are catalyzed by penicillin-binding proteins (PBPs). However, although non-canonical d-amino acids are known to be incorporated into peptidoglycan, the maturation and recycling of peptidoglycan containing such residues remain uncharacterized. Therefore, we investigated whether PBP4 and PBP5, low molecular mass (LMM) PBPs from Escherichia coli and Bacillus subtilis, are involved in these events of peptidoglycan metabolism. Enzyme assays using p-nitroaniline (pNA)-derivatized d-amino acids and peptidoglycan-mimicking peptides revealed that PBP4 and PBP5 from both species have peptidase activity toward substrates containing d-Asn, d-His, or d-Trp. These d-amino acids slowed the growth of dacA- or dacB-deficient E. coli (∆dacA or ∆dacB) relative to the wild-type strain. Additionally, these d-amino acids affected biofilm formation by the ∆dacB strain. Collectively, PBP4 and PBP5 are involved in the cleavage of peptidoglycan containing non-canonical d-amino acids, and these properties affect growth and biofilm formation.
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Abbreviations
- PBPs:
-
Penicillin-binding proteins
- GlcNAc:
-
N-Acetylglucosamine
- MurNAc:
-
N-Acetylmuramic acid
- Dpm:
-
Diaminopimelate
- PLP:
-
Pyridoxal 5′-phosphate
- HMM:
-
High molecular mass
- LMM:
-
Low molecular mass
- OPA:
-
o-Phthalaldehyde
- Ac:
-
Acetyl
- Ac2 :
-
Diacetyl
- pNA:
-
p-Nitroaniline
- Boc-l-Cys:
-
N-tert-Butoxycarbonyl-l-cysteine
- WT:
-
Wild type
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Acknowledgements
We thank S. Kitamoto and R. Takasaki (School of Pharmacy, Kitasato University) for assistance with the experiments. This work was supported in part by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant number 17K18082 (to T.M.).
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TM designed the study, performed most of the experiments, and analyzed the data. HH supervised the study. TM and HH wrote the manuscript. All the authors contributed to the interpretation of the results throughout the study.
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Miyamoto, T., Katane, M., Saitoh, Y. et al. Involvement of penicillin-binding proteins in the metabolism of a bacterial peptidoglycan containing a non-canonical d-amino acid. Amino Acids 52, 487–497 (2020). https://doi.org/10.1007/s00726-020-02830-7
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DOI: https://doi.org/10.1007/s00726-020-02830-7