Document Detail

Direct observation of Staphylococcus aureus cell wall digestion by lysostaphin.
MedLine Citation:
PMID:  18835985     Owner:  NLM     Status:  MEDLINE    
The advent of Staphylococcus aureus strains that are resistant to virtually all antibiotics has increased the need for new antistaphylococcal agents. An example of such a potential therapeutic is lysostaphin, an enzyme that specifically cleaves the S. aureus peptidoglycan, thereby lysing the bacteria. Here we tracked over time the structural and physical dynamics of single S. aureus cells exposed to lysostaphin, using atomic force microscopy. Topographic images of native cells revealed a smooth surface morphology decorated with concentric rings attributed to newly formed peptidoglycan. Time-lapse images collected following addition of lysostaphin revealed major structural changes in the form of cell swelling, splitting of the septum, and creation of nanoscale perforations. Notably, treatment of the cells with lysostaphin was also found to decrease the bacterial spring constant and the cell wall stiffness, demonstrating that structural changes were correlated with major differences in cell wall nanomechanical properties. We interpret these modifications as resulting from the digestion of peptidoglycan by lysostaphin, eventually leading to the formation of osmotically fragile cells. This study provides new insight into the lytic activity of lysostaphin and offers promising prospects for the study of new antistaphylococcal agents.
Grégory Francius; Oscar Domenech; Marie Paule Mingeot-Leclercq; Yves F Dufrêne
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-10-03
Journal Detail:
Title:  Journal of bacteriology     Volume:  190     ISSN:  1098-5530     ISO Abbreviation:  J. Bacteriol.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-11-26     Completed Date:  2008-12-08     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  2985120R     Medline TA:  J Bacteriol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7904-9     Citation Subset:  IM    
Unité de Chimie des Interfaces, Université Catholique de Louvain, Louvain-la-Neuve, Belgium.
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MeSH Terms
Anti-Bacterial Agents / pharmacology
Cell Wall / drug effects*
Elastic Modulus
Lysostaphin / pharmacology*
Microscopy, Atomic Force
Peptidoglycan / drug effects*
Staphylococcus aureus / cytology,  drug effects*
Reg. No./Substance:
0/Anti-Bacterial Agents; 0/Peptidoglycan; EC

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