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Structural Changes of a Protein Bound to a Polyelectrolyte Depend on the Hydrophobicity and Polymerization Degree of the Polyelectrolyte

S. V. Stogov1, V. A. Izumrudov2, and V. I. Muronetz1,3*

1Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, 119991 Moscow, Russia; fax: (495) 939-0174; E-mail: vimuronets@belozersky.msu.ru

2Faculty of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia

3Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia

* To whom correspondence should be addressed.

Received September 29, 2009; Revision received October 16, 2009
Influence of polyelectrolytes of different chemical structure and degree of polymerization on aggregation and denaturation of the oligomeric enzyme glyceraldehyde-3-phosphate dehydrogenase has been studied to ascertain molecular characteristics of the polymer chains providing the efficient prevention of aggregation of the enzyme without drastic changes in its structure and catalytic activity. The best polymers meeting these requirements were found to be hydrophilic high-molecular-weight polyelectrolytes forming stable complexes with the enzyme. The revealed pronounced negative effect of short polymer chains on the enzyme must be taken into account in the design of protein–polyelectrolyte systems by using thoroughly fractionated polymer samples containing no admixture of charged oligomers.
KEY WORDS: glyceraldehyde-3-phosphate dehydrogenase, polysulfoanions, protein–polyelectrolyte complexes, thermoaggregation suppression, differential scanning calorimetry

DOI: 10.1134/S0006297910040061