Abstract
By the heating of diluted solutions of simusan—an anionic exocellular lipopolysaccharide of Acenitobacter sp.—an endothermic, presumably, conformational transition occurs. Specific features of this transition are its high cooperativity and the reduction of the transition heat by the decrease of the temperature scanning rate. The temperature of the transition is a linear function of the logarithm of the concentration of NaCl or KCl. The conformational transition appears to be accompanied by an athermic transition that manifests itself in the additional change of the specific heat. Divalent metal ions (Mg2+ and Ca2+) increase the temperature and the enthalpy of the transition to a greater extent than monovalent ions do. The cooperativity of the transition in the presence of divalent metal ions is higher than in the presence of monovalent metal ions. The removal of hydrophobic groups leads to the decrease both of the temperature and the cooperativity of the conformational transition of simusan. © 1996 John Wiley & Sons, Inc.
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