Abstract
The polypeptide profile of the porin protein fraction of Yersinia ruckeri, a Gram-negative bacterium causing yersiniosis in fish, has been shown to depend on cultivation temperature. OmpF-like porins are expressed mainly in the outer membrane (OM) of the “cold” variant (4°C) of the microorganism and OmpC-like proteins are expressed in the OM of the “warm” variant (37°C). Both types of porins are present in the OM of Y. ruckeri at room temperature. The OmpF-like porin of the “cold” variant was isolated and characterized. The molecular weight and primary structure of the protein were determined. The methods of optical spectroscopy (circular dichroism and intrinsic protein fluorescence) have shown that the protein has a spatial structure typical of β-structured porins from the OM of Gram-negative bacteria. The functional activity of isolated protein was characterized by the bilayer lipid membrane (BLM) technique. The most probable level of channel conductivity was 320 ± 60 pS, corresponding to the channel conductivity of OmpF porins of the genus Yersinia. The distinctive feature of OmpF porin from Y. ruckeri is high thermostability of its functionally active conformation: the protein forms stable pores in the BLM even after heating to 85°C.
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Original Russian Text © D.K. Chistyulin, O.D. Novikova, O.Yu. Portnyagina, V.A. Khomenko, T.I. Vakorina, N.Yu. Kim, M.P. Isaeva, G.N. Likhatskaya, T.F. Solov’eva, 2012, published in Biologicheskie Membrany, 2012, Vol. 29, No. 3, pp. 156–164.
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Chistyulin, D.K., Novikova, O.D., Portnyagina, O.Y. et al. Isolation and characterization of OmpF-like porin from Yersinia ruckeri . Biochem. Moscow Suppl. Ser. A 6, 235–242 (2012). https://doi.org/10.1134/S1990747812030038
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DOI: https://doi.org/10.1134/S1990747812030038