Abstract
In this study, we investigated the optical features of the redox metal-dependent proteins cytochrome-c, horseradish peroxidase (HRP), and ascorbate oxidase embedded in a sol-gel-processed silica matrix as a function of gelation time. Circular dichroism, absorbance, and fluorescence spectroscopies revealed that the sol-gel process affects the complex structure of the dimeric ascorbate oxidase (although the prosthetic coppers still remain bound to the enzyme) but not that of monomeric cytochrome-c and HRP. Any modifications in ascorbate oxidase occurred in the initial gelation phase; the drying process induced no further alterations and the enzyme remained stable for months. Unfolding-refolding experiments on cytochrome-c revealed severely restricted motility in the protein moiety in the xerogel, the concentrated matrix that forms after drying. The diffusion time of the solvent within the matrix, which regulated the enzyme-substrate reaction rate, depended on the thickness of the monolith, not on the dryness of the specimen.
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Avnir, D., Braun, S., Lev, O., and Ottolenghi, M. (1994), Chem. Mater. 6, 1605–1614.
Ellerby, L. M., Nishida, C. R., Nishida, F., Yamanaka, S. A., Dunn, B., Valentine, J. S., and Zink, J. I. (1992), Science 255, 1113–1115.
Yamanaka, S. A., Dunn, B., Valentine, J. S., and Zink, J. I. (1995), J. Am. Chem. Soc. 117, 9095, 9096.
Wu, S., Lin, J., and Chan, S. I. (1994), Appl. Biochem. Biotechnol. 47, 11–20.
Shtelzer, S., Rappoport, S., Avnir, D., Ottolenghi M., and Braun, S. (1992), Biotechnol. Appl. Biochem. 15, 227–235.
Hartenett, A. M., Ingersoll, C. M., Baker, G. A., and Bright, F. (1999), Anal. Chem. 71, 1215–1224.
Dunford, H. B. (1991), in Peroxidases in Chemistry and Biology, vol. 2, Everse, I., Everse, K. E., and Grisham, M. B., eds., CRC Press, Boca Raton, FL, pp. 1–24.
Ruzgas, T., Csoregi, E., Emneus, J., Gorton, L., and Marko-Varga, G. (1996), Anal. Chim. Acta 330, 123–128.
Messerschimdt, A., Ladenstein, R., Huber, R., Bolognesi, M., Avigliano, L., Petruzzelli, R., Rossi, A., and Finazzi-Agrò, A. (1992), J. Mol. Biol. 224, 179–205.
Crawford, G. A., Mahoney, J. F., and Györy, A. Z. (1985), Clin. Chim. Acta 147, 51–57.
Suzuki, M. and Yoshida, M. (1984), Clin. Chim. Acta 140, 289–294.
Freemantle, J., Freemantle, M. J., and Badrik, T. (1994), Clin. Chem. 40, 950, 951.
Anzai, J., Takeshita, H., Kobayashi, Y., Osa, T., and Hoshi, T. (1998), Anal. Chem. 70, 811–817.
Esaka, M., Suzuki, K., and Kubota, K. (1985), Agric. Biol. Chem. 49, 2955–2960.
Stevanato, R., Avigliano, L., Finazzi-Agrò, A., and Rigo, A. (1985), Anal. Biochem. 149, 537–542.
Greenway, G. M. and Ongomo, P. (1990), Analyst 115, 1297–1299.
Edmiston, P. L., Wambolt, C. L., Smith, M. K., and Saavedra, S. S. (1994), J. Colloid Interface Sci. 163, 395–406.
Jordan, J. D., Dunbar, R. A., and Bright, V. F. (1995), Anal. Chem. 67, 2436–2443.
Shibayama, N. and Saigo, S. (1995), J. Mol. Biol. 251, 203–209.
Shibayama, N. and Saigo, S. (1999), J. Am. Chem. Soc. 121, 444, 445.
Arnao, M. B., Acosta, M., del Rio, J. A., Varòn, R., and Garcia-Canovas, F. (1990), Biochim. Biophys. Acta 1041, 43–47.
Baynton, K. J., Bewtra, J. K., Biswas, N., and Taylor, K. E. (1994), Biochim. Biophys. Acta 1206, 272–278.
Morpurgo, L., Graziani, M. T., Marcozzi, G., and Avigliano, L. (1993), J. Inorg. Biochem. 51, 641–647.
Casella, L., Gullotti, M., Pallanza, G., Pintar, A., and Marchesini, A. (1988), Biochem. J. 251, 411–466.
Cole, J., Avigliano, L., Morpurgo, L., and Solomon, E. I. (1991), J. Am. Chem. Soc. 113, 9080–9089.
Messerschmidt, A., Luecke, H., and Huber, R. (1993), J. Mol. Biol. 230, 997–1014.
Mei, G., Di Venere, A., Buganza, M., Vecchini, P., Rosato, N., and Finazzi-Agrò, A. (1997), Biochemistry 36, 10,917–10,922.
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Savini, I., Santucci, R., Venere, A.D. et al. Catalytic and spectroscopic properties of cytochrome-c, horseradish peroxidase, and ascorbate oxidase embedded in a sol-gel silica matrix as a function of gelation time. Appl Biochem Biotechnol 82, 227–241 (1999). https://doi.org/10.1385/ABAB:82:3:227
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DOI: https://doi.org/10.1385/ABAB:82:3:227