Document Detail

Molar mass, entanglement, and associations of the biofilm polysaccharide of Staphylococcus epidermidis.
MedLine Citation:
PMID:  23540609     Owner:  NLM     Status:  MEDLINE    
Biofilms are microbial communities that are characterized by the presence of a viscoelastic extracellular polymeric substance (EPS). Studies have shown that polysaccharides, along with proteins and DNA, are a major constituent of the EPS and play a dominant role in mediating its microstructure and rheological properties. Here, we investigate the possibility of entanglements and associative complexes in solutions of extracellular polysaccharide intercellular adhesin (PIA) extracted from Staphylococcus epidermidis biofilms. We report that the weight average molar mass and radius of gyration of PIA isolates are 2.01×10(5)±1200 g/mol and 29.2±1.2 nm, respectively. The coil overlap concentration, c*, was thus determined to be (32±4)×10(-4) g/mL. Measurements of the in situ concentration of PIA (cPIA,biofilm) was found to be (10±2)×10(-4) g/mL.Thus, cPIA,biofilm<c* and the amount of PIA in the biofilm is too low to cause polymer chain entanglements. In the pH range 3.0-5.5, PIA was found to both self-associate and to form complexes with bovine serum albumin (BSA). By static light scattering, both self-association and complex formation with 0.5% (w/v) BSA were found to occur at PIA concentrations of 0.30×10(-4) g/mL and greater, which is about 30 times lower than the measured cPIA,biofilm. These results suggest that the microscopic origin of EPS viscoelasticity is unlikely to be due to polysaccharide entanglements. Furthermore, the onset of self-association and protein complexation of PIA occurs at concentrations far lower than the native PIA concentration in biofilms. This finding therefore suggests a critical role for those two association mechanisms in mediating biofilm viscoelasticity.
Mahesh Ganesan; Elizabeth J Stewart; Jacob Szafranski; Ashley E Satorius; John G Younger; Michael J Solomon
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2013-04-17
Journal Detail:
Title:  Biomacromolecules     Volume:  14     ISSN:  1526-4602     ISO Abbreviation:  Biomacromolecules     Publication Date:  2013 May 
Date Detail:
Created Date:  2013-05-13     Completed Date:  2013-12-16     Revised Date:  2014-05-14    
Medline Journal Info:
Nlm Unique ID:  100892849     Medline TA:  Biomacromolecules     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1474-81     Citation Subset:  IM    
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MeSH Terms
Bacterial Adhesion
Biofilms / growth & development*
Carbohydrate Conformation
Hydrogen Bonding
Hydrogen-Ion Concentration
Polysaccharides, Bacterial / chemistry*,  isolation & purification
Protein Binding
Serum Albumin, Bovine / chemistry*
Staphylococcus epidermidis / chemistry*
Static Electricity
Grant Support
Reg. No./Substance:
0/Polysaccharides, Bacterial; 0/Serum Albumin, Bovine; 0/polysaccharide intercellular adhesin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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