Blood Serum Affects Polysaccharide Production and Surface Protein Expression in S. Aureus
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2017
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Nazrul I, Khwaja G. Hossain, Julia M R, Mark R M. Blood Serum Affects Polysaccharide Production and Surface Protein 002 Expression in S. Aureus. Adv Biotech & Micro. 2017; 2(3): 555589. DOI: 10.19080/AIBM.2017.02.555589
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This item may be protected under Title 17 of the U.S. Copyright Law. It is made available by UMBC for non-commercial research and education. For permission to publish or reproduce, please contact the author.
Abstract
Background: S. aureus biofilm serves a major role in pathogenesis. Two of the major components of bacterial biofilm are Polysaccharides intercellular adhesions (PIA) and surface proteins. It is not known how PIA and surface proteins expressions are affected in presence of blood serum. Analyses of surface proteins expressions will provide more effective biomarker discovery that might lead to development of antimicrobial therapeutics to meet the challenges of biofilm-related infections.
Method: Secondary cultures of S. aureus Philips, a biofilm-forming bacterium, were generated by inoculating 1 ml of overnight culture into 50 ml of TSB. Bacteria were cultured at several concentrations of blood serum and found that 12.5% supplemented blood serum provide s similar growth curve as normal TSB (100%). One and 2 D SASPAGE were used to separate proteins and the differentially expressed proteins were identified by nano-LC/MS.
Results: Polysaccharide intercellular adhesions production was significantly increased due to the addition of blood serum in the media. We also identified two serum proteins, apolipoprotein and globulin (Fc and Fab), that remained attached with the membrane fraction of bacterial proteins.
Conclusion: These results have strongly demonstrated that blood serum influences the exopolysaccharide expression in S. aureus.