In:
Infection and Immunity, American Society for Microbiology, Vol. 76, No. 5 ( 2008-05), p. 2044-2050
Kurzfassung:
Biofilm formation in Staphylococcus aureus under in vitro growth conditions is generally promoted by high concentrations of sugar and/or salts. The addition of glucose to routinely used complex growth media triggered biofilm formation in S. aureus strain SA113. Deletion of ccpA , coding for the catabolite control protein A (CcpA), which regulates gene expression in response to the carbon source, abolished the capacity of SA113 to form a biofilm under static and flow conditions, while still allowing primary attachment to polystyrene surfaces. This suggested that CcpA mainly affects biofilm accumulation and intercellular aggregation. trans -Complementation of the mutant with the wild-type ccpA allele fully restored the biofilm formation. The biofilm produced by SA113 was susceptible to sodium metaperiodate, DNase I, and proteinase K treatment, indicating the presence of polysaccharide intercellular adhesin (PIA), protein factors, and extracellular DNA (eDNA). The investigation of several factors which were reported to influence biofilm formation in S. aureus ( arlRS , mgrA , rbf , sarA , atl , ica , citZ , citB , and cidABC ) showed that CcpA up-regulated the transcription of cidA , which was recently shown to contribute to eDNA production. Moreover, we showed that CcpA increased icaA expression and PIA production, presumably over the down-regulation of the tricarboxylic acid cycle genes citB and citZ .
Materialart:
Online-Ressource
ISSN:
0019-9567
,
1098-5522
DOI:
10.1128/IAI.00035-08
Sprache:
Englisch
Verlag:
American Society for Microbiology
Publikationsdatum:
2008
ZDB Id:
1483247-1
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