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Volume 165, Issue 9

Understanding the role of the lysozyme-like domain of D29 mycobacteriophage-encoded endolysin in host cell lysis and phage propagation Free

Abstract

Mycobacteriophages are viruses that infect and kill mycobacteria. The peptidoglycan hydrolase, lysin A (LysA), coded by one of the most potent mycobacteriophages, D29, carries two catalytic domains at its N-terminus and a cell wall-binding domain at its C-terminus. Here, we have explored the importance of the centrally located lysozyme-like catalytic domain (LD) of LysA in phage physiology. We had previously identified an R198A substitution that causes inactivation of the LD when it is present alone on a polypeptide. Here, we show that upon incorporation of the same mutation (i.e. R350A) in full-length LysA, the protein demonstrates substantially reduced activity , even in the presence of the N-terminal catalytic domain, and has less efficient mycobacterial cell lysis ability when it is expressed in . These data suggest that an active LD is required for the full-length protein to function optimally. Moreover, a mutant D29 phage harbouring this substitution (D29) in its LysA protein shows significantly delayed host lysis. However, the mutant phage demonstrates an increase in burst size and plaque diameter. Taken together, our data show the importance of an intact LD region in D29 LysA PG hydrolase, and indicate an evolutionary advantage over other phages that lack such a domain in their endolysins.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): bacteriophage , BRED , endolysin , mycobacteria and peptidoglycan hydrolase
© 2019 The Authors
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2019-09-01
2024-04-16
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Understanding the role of the lysozyme-like domain of D29 mycobacteriophage-encoded endolysin in host cell lysis and phage propagation
Microbiology 165, 1013 (2019); https://doi.org/10.1099/mic.0.000831
/content/journal/micro/10.1099/mic.0.000831
/content/journal/micro/10.1099/mic.0.000831
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