Tolerance of Acinetobacter calcoaceticus RAG-1 to the cationic surfactant cetyltrimethylammonium bromide: role of the bioemulsifier emulsan.
AUTOR(ES)
Shabtai, Y
RESUMO
Emulsan, the polyanionic heteropolysaccharide bioemulsifier produced by Acinetobacter calcoaceticus RAG-1, was found to enhance the tolerance of RAG-1 cells to the toxic effects of the cationic detergent cetyltrimethylammonium bromide (CTAB). Emulsan-mediated tolerance was obtained with the purified deproteinated apoemulsan; ca. 9 micrograms of apoemulsan neutralized 1 microgram of CTAB. Deesterified apoemulsan was only half as effective in protecting the cells from CTAB toxicity. Tolerance was also mediated by the cell-associated emulsan minicapsule. Mutants lacking this capsule were more sensitive to CTAB than the corresponding parent. The growth of mutants and parent cells in mixed-culture experiments demonstrated that the cell-associated polymer mediates CTAB tolerance in the early stages of growth. Once sufficient cell-free polymer has been released into the aqueous medium (ca. 0.5 micrograms/ml), this extracellular emulsan also plays a role in CTAB tolerance.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=238368Documentos Relacionados
- Enhanced emulsan production in mutants of Acinetobacter calcoaceticus RAG-1 selected for resistance to cetyltrimethylammonium bromide.
- Role for Emulsan in Growth of Acinetobacter calcoaceticus RAG-1 on Crude Oil
- Self-Cycling Fermentation Applied to Acinetobacter calcoaceticus RAG-1
- Role of adherence in growth of Acinetobacter calcoaceticus RAG-1 on hexadecane.
- An Exocellular Protein from the Oil-Degrading Microbe Acinetobacter venetianus RAG-1 Enhances the Emulsifying Activity of the Polymeric Bioemulsifier Emulsan
