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Volume 167, Issue 3

PBP4 and PBP5 are involved in regulating exopolysaccharide synthesis during biofilm formation Free

Abstract

low-molecular-mass (LMM) Penicillin-binding proteins (PBPs) help in hydrolysing the peptidoglycan fragments from their cell wall and recycling them back into the growing peptidoglycan matrix, in addition to their reported involvement in biofilm formation. Biofilms are external slime layers of extra-polymeric substances that sessile bacterial cells secrete to form a habitable niche for themselves. Here, we hypothesize the involvement of LMM PBPs in regulating the nature of exopolysaccharides (EPS) prevailing in its extra-polymeric substances during biofilm formation. Therefore, this study includes the assessment of physiological characteristics of CS109 LMM PBP deletion mutants to address biofilm formation abilities, viability and surface adhesion. Finally, EPS from parent CS109 and its ΔPBP4 and ΔPBP5 mutants were purified and analysed for sugars present. Deletions of LMM PBP reduced biofilm formation, bacterial adhesion and their viability in biofilms. Deletions also diminished EPS production by ΔPBP4 and ΔPBP5 mutants, purification of which suggested an increased overall negative charge compared with their parent. Also, EPS analyses from both mutants revealed the appearance of an unusual sugar, xylose, that was absent in CS109. Accordingly, the reason for reduced biofilm formation in LMM PBP mutants may be speculated as the subsequent production of xylitol and a hindrance in the standard flow of the pentose phosphate pathway.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): biofilm , DD-carboxypeptidase , endopeptidase , Escherichia coli , exopolysaccharide and penicillin-binding proteins
Funding
This study was supported by the:
  • Science and Engineering Research Board (Award CRG/2019/001558)
    • Principle Award Recipient: AnindyaS Ghosh
  • Department of Biotechnology, Ministry of Science and Technology (Award BT/PR24255/NER/95/716/2017)
    • Principle Award Recipient: S GhoshAnindya
© 2021 The Authors
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2021-02-04
2024-04-24
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PBP4 and PBP5 are involved in regulating exopolysaccharide synthesis during Escherichia coli biofilm formation
Microbiology 167, 001031 (2021); https://doi.org/10.1099/mic.0.001031
/content/journal/micro/10.1099/mic.0.001031
/content/journal/micro/10.1099/mic.0.001031
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