Ozimek, L. K., Kralj, S., van der Maarel, M. E. C. And Dijkhuizen, L. (2006). The levansucrase and inulosucrase enzymes of Lactobacillus reuteri 121 catalyse processive and non-processive transglycosylation reactions. Microbiology 152: 1187-1196. Pons, T., Hernandez, L., Batista, F. R. and Chinea, G. (2000). Prediction of a common betapropeller catalytic domain for fructosyltransferases of different origin and substrate specifity. Protein Sci. 9: 2285-2291. van Riet, L., Altenbach, D., Vergauwen, R., Clerens, S., Kawakami, A., Yoshida, M., van den Ende, W., Wiemken, A. and van Laere, A. (2008). Purification, cloning and functional differences of a third fructan 1-exohydrolase (1-FEHw3) from wheat (Triticum aestivum). Physiol. Plant. 133: 242-253. Rivas, de las B., Curiel, J. A., Mancheno, J. M. and Munos, R. (2007). Expression vectors for enzyme restriction- and ligation-independent cloning for producing recombinant His-fusion proteins. Biotechnol. Prog. 23: 680-686. Roberfroid, M., Slavin, J. (2000). Nondigestible oligosaccharides. Crit. Rev. Food Sci. Nutr. 40: 461-480. Sambrook, J., Fritsch, E. T. and Maniatis, T. (1989). Molecular cloning: a laboratory manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY. Sangiliyandi, G., Ray, K. C. and Gunasekaran, P. (1999). Elevated temperature and chemical modification selectively abolishes levan forming activity of levansucrase of Zymomonas mobilis. Biotechnol. Lett. 21: 179-182. Schroeder, V. A., Michalek, S. M. and Macrina, F. L. (1989). Biochemical characterization and evaluation of virulence of a fructosyltransferase-deficient mutant of Streptococcus mutans V403. Infect Immun 57: 3560-3569. Schägger, H. (2006). Tricin-SDS-PAGE. Nat. Protocols 1: 16-22. Sharma, R. C., Schimke, R. T. (1996). Preparation of electrocompetent E. coli using salt-free growth medium. Biotechniques 20: 42-44. Song, K. B., Rhee, S. K. (1994). Enzymatic synthesis of levan by Zymomonas mobilis levansucrase overexpressed in Escherichia coli. Biotechnol. Lett. 16: 1305-1310. St. John, J. A., Bonnett, G. D. and Simpson, R. J. (1996). A method for rapid quantification of sucrose and fructan oligosaccharides suitable for enzyme and physiological studies. New Phytol. 134: 197-203. Studier, F. W., Moffatt, B. A. (1986). Use of bacteriophage T7 RNA polymerase to direct selective high-level expression of cloned genes. J. Mol. Biol. 189: 113-130. Tajima, K., Tanio, T., Kobayashi, Y., Kohno, H., Fujiwara, M., Shiba, T., Erata, T., Munekata, M. and Takai, M. (2000). Cloning and sequencing of the levansucrase gene from Acetobacter xylinum NCI 1005. DNA Res. 7: 237-242. Thompson, J. D., Higgins, D. G. and Gibson, T. J. (1994). CLUSTAL W: improving the sensitivity of progressive multiple sequence alignment through sequence weighting, positionspecific gap penalties and weight matrix choice. Nucleic Acids Res. 22: 4673-4680. Tiirik, K. (2010). Levaansukraasi katalüüsis osalevate aminohapete kindlakstegemine Asp219 ja Asp225 muteerimisega. Bakalaureusetöö, Tartu Ülikool. Toomemaa, R. (2007). <strong>Pseudomonas</strong> <strong>syringae</strong> pv. tomato <strong>levaansukraasi</strong>de omaduste uurimine. Bakalaureusetöö, Tartu Ülikool. Velazquez-Hernandez, M. L., Baizabal-Aguirre, V. M., Bravo-Patiño, A., Cajero-Juarez, M., Chavez-Moctezuma, M. P. and Valdez-Alarcon, J. J. (2008). Microbial fructosyltransferases and the role of fructans. J. Appl. Microbiol. 106: 1763-1778. 38
Visnapuu, T. (2007). Levaansukraasi geenide ekspresseerimine E. coli’s ja valkude omaduste uurimine. Magistritöö, Tartu Ülikool. Visnapuu, T., Mäe, A. and Alamäe, T. (2008). Hansenula polymorpha maltase gene promoter with sigma 70-like elements is feasible for Escherichia coli-based biotechnological applications: Expression of three genomic levansucrase genes of <strong>Pseudomonas</strong> <strong>syringae</strong> pv. tomato. Process Biochem. 43: 414-422. Visnapuu, T., Zamfir, A. D., Mosoarca, C., Stanescu, M. D. and Alamäe, T. (2009). Fully automated chip-based negative mode nanoelectrospray mass spectrometry of fructooligosaccharides produced by heterologously expressed levansucrase from <strong>Pseudomonas</strong> <strong>syringae</strong> pv. tomato <strong>DC3000</strong>. Rapid. Commun. Mass. Spectrom. 23: 1337- 1346. Vuong, T. V., Wilson, D. B. (2010). Glycoside hydrolases: Catalytic base/nucleophile diversity. Biotechnol. Bioeng. 107: 195-205. Wei, D., Li, M., Zhang, X. and Xing, L. (2004). An improvement of the site-directed mutagenesis method by combination of megaprimer, one-side PCR and Dpn I treatment. Anal. Biochem. 331: 401-403. Yanase, H., Maeda, M., Hagiwara, E., Yagi, H., Taniguchi, K. and Okamoto, K. (2002). Identification of functionally important amino acid residues in Zymomonas mobilis levansucrase. J. Biochem. 132: 565-572. KASUTATUD VEEBIAADRESSID http://www.cazy.org http://expasy.org/tools/pi_tool.html 39