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KESIMPULAN DAN SARAN

Dalam dokumen TESIS DEBY EDYLIANI NIM (Halaman 34-41)

5.1. Kesimpulan

1. Enzim DPEase yang dimurnikan menggunakan kolom 6xhis tag dengan satu kali purifikasi langsung dalam keadaan aktif. Dikonfirmasi melalui elektroforesis SDS-PAGE dan uji aktivitas enzim. Menurut hasil elektroforesis, enzim DPEase pada penelitian ini muncul dalam pita tunggal dengan massa molekul 32 kDa yang menunjukkan keberhasilan pemurnian menghasilkan aktivitas spesifik 5,09 U/mg.

2. DPEase murni menunjukkan aktivitas optimal pada pH 8,5 dan suhu 45°C. Aktivitas DPEase ditingkatkan dengan ketersediaan kofaktor, Co² +, Mn² +, Fe² +, Ni² + dan dihambat di hadapan Mg² +, Mo² +, Cu² +, Ca² +, Ca² +, Zn² +.

5.2. Saran

Untuk industrialisasi enzim DPEase dibutuhkan upaya perbaikan. Penambahan kofaktor Fe2+ bisa digunakan untuk menjawab persoalan itu. Fe2+ sangat direkomendasikan untuk aplikasinya di industri makanan..

21 DAFTAR PUSTAKA

Arnau, J., Lauritzen, C., Petersen, G. E., & Pedersen, J. (2006). Current strategies for the use of affinity tags and tag removal for the purification of recombinant proteins. Protein Expression and Purification, 48 (1), 1–13. doi:10.1016/ j.pep. 2005.12.002.

Baek SH, Park SJ, Lee HG. (2010) D-psicose, a sweet monosaccharide, ameliorate hyperglycemia, and dyslipidemia in C57BL/6J db/db mice. J Food Sci. 2010 Mar;

75(2):H49-53. doi: 10.1111/j.1750-3841.2009.01434.x.

Bergmeyer, H.U. (1987). Method of Enzymatic Analysis. VCH.Vo1.IV:45-49.

Bernfeld, P., (1955), Amylases α and β, Dalam Colowick, S.P. and N.O. Kaplan (Eds), Methods in Enzymology and Related of Biochemistry. Academic Press, New York.

Blattner, F.R, Plunkett, G, Bloch, C.A. (1997). The complete genome sequence of Eschericia coli K-12. Science 277, 1453-1474.

B.-C. Lim, Hye Jung Kim, Deok Kun Oh.(2009) . A stable immobilizied D-psicose 3-epimerase for the production of D-psicose in the present of borate. Process Biochemistry 44 (2009) 822–82. doi:10.1016/j.procbio.2009.03.017

Bollag, D.M. and Edelstein. S. J. (1991). Protein Methods. Willey-liss. Newyork

Boyer, R.F. (1993). Modern Experimental Biochemistry. The Benjamin Chummings epimerase and xylose isomerase. Enzyme and Microbial Technology 105 (2017) 18–23..

Choi , J. G., Ju, Y.H., Yeom, S.J., & Oh, D.K. (2011). Improvement in the thermostabiliy of D-Psicose 3-Epimerase from Agrobacterium tumafaciens by random and site-directed mutagenesis. Alied and Environmental Microbiology, 77,7316e7320.

22 Eijnsink, G.H., Sirgit, G. Torben, V. Bertus van de Burg. (2005). Directed Evolution of Enzyme Stability. Biomolecular Engineering. Elsevier Science Inc. New York. 23:21-30.

FDA.(2011) GRAS notice inventory, GRN No. 400. http:// www. accessdata. Fda .gov ingestion by normal human subjects. Biosci Biotechnol Biochem 74:510–519.

Hong, J., Wang, Y., Ye, X., & Zhang, Y.-H. P. (2008). Simple protein purification through affinity adsorption on regenerated amorphous cellulose followed by intein self-cleavage. Journal of Chromatography A, 1194(2), 150–154. rats. Biochemical and Biohysical Research Communication 425:717-723.

Indradewi R, Miftahudin, Saksono B . (2017). Isolasi, Kloning, dan Ekspresi Gen dpe dari Agrbacterium tumafaciens sebagai Gen Penyandi Enzim D-psicose 3- Epimerase (DPEase). Jurnal.http://repository.ipb.ac.id.

Ishida, Y., T. Kamiya, H. Itoh, Y. Kimura, and K. Izumori. (1997). Cloning and characterization of the D-tagatose 3-epimerase gene from Pseudomonas cichorii ST-24. J. Ferment. Bioeng. 83:529–534. 8.

Itoh, H., H. Okaya, A. R. Khan, S. Tajima, S. Hayakawa, and K. Izumori.

(1994). Purification and characterization of D-tagatose 3-epimerase from Pseudomonas sp. ST-24. Biosci. Biotechnol. Biochem. 58:2168–2171. 9.

23

Itoh, H.,T. Sato,and K.Izumori. (1995). Preparationof D-psicosefrom D-fructose by immobilized D-tagatose 3-epimerase. J. Ferment. Bioeng. 80:101–103.

J. G. Choi, Y.H. Ju, S.J. Yoom, D.K. Oh. (2011). Appl. Environ. Microbiol 77. 7320.

Jia, M., Mu, W., Chu, F., Zhang, X., Jiang, B., Zhou, L., et al. (2014). A. D- Psicose Epimerase with neutral pH optimum from Clostridium boltea for D- psicose production:

Cloning, expression, purification, and characterization. Applied Microbiology and Biotechnology, 98, 717e725.

Kazan, D, H. Ertan, A. Erarslan. (1997). Stabilization of Escherichia coli Penicillin G Acylase agains thermal Inactivation by cross-linking with dextran dialdehyde polymers.

Applied. Microbiology and Biotechnology. 48: 191- 197.

Khopkar, S. M., (1990). Konsep Dasar Kimia Analitik. Jakrta: UI Press.

Kierstan MPJ. (1978). Biotechnology and Bioengineering. 20:447-450. New York (USA): John Wiley & Sons.

Kim, K., Kim, H.-J., Oh, D.-K., Cha, S.-S., and Rhee, S. (2006). Crystal structure of psicose 3-epimerase from Agrobacterium tumefaciens and its complex with true substrate D-fructose: a pivotal role of metal in catalysis, an active site for the phosphorylated substrate, and its conformational changes. J Mol Biol 361, 920– 931.

Kim, N.-H., Kim, H.-J., Kang, D.-I., Jeong, K.-W., Lee, J.-K., Kim, Y., and Oh, D.-K.

(2008). Conversion shift of D-fructose to D-psicose for enzyme catalyzed epimerization by addition of borate. Appl Environ Microbiol 74,3008–3013.

Lay, B. W. and Sugyo,H. (1992). Mikrobiologi. Rajawali Pers. Jakarta. 107-112.

Lee DW, Choe EA, Kim SB, Eom SH, Hong YH, et al. (2005). Distinct metal dependence for catalytic and structural functions in the l-arabinose isomerasesfrom the mesophilic Bacillus halodurans and the thermophilic Geobacillus stearothermophilus. Arch Biochem Biophys 434: 333–343.

Lehninger, A.L. (1982). Dasar-Dasar Biokimia. Erlangga. Jakarta.369 halaman.

Limanto, Kenny R., Bernadetta Arum W., Rachelia Octavia, Jenny Marina, Ina Juni A., Kritina Nety. (2011). Size Exclusion Chramatography. Yogjakarta : Universitas Sanata Dharma.

24 Lowry, O. H., N. J., Rosebrough, A. L., Farr, R. J. Randall. (1951). Protein measurement with the folin phenol reagent. Journal of Biology and Chemistry. 193-265.

Martoharsono, S. dkk. (1984). Biokimia. UGM Press. Yogyakarta. 91 halaman.

Matsuo, T. Suzuki, H. Hashiguchi, M. Izumori, K. (2002). D-Psicoseis a rare sugar that provides no energy to growing rats. J. Nutr. Sci. Vitaminol. Tokyo. 2002, 48, 77 – 80.

Miller, B. S., and T. Swain. (1969). Chromatographic analyses of the free amino acids, organic acids and sugars in wheat plant extracts. J. Sci. Food Agric. 11:344-348.

M.K.Takata, F. Yamaguchi, K.Nakanose, Y. Watanabe, N. Hatano, I.

Tsukamoto, M.Nagata, K. Izumori, M. Tokuda, (2005). Neuroprotective effect of Psicose on 6- Hydroxydoamine-induced apoptosis in rat pheochhromocytoma (PC12) cells. J.Biosci. Bioeng. 100:511-516.

Mozhaev, V.V. and K. Martinek. (1984). Structur-Stability Relationship in Protein: New Approaches to Stabilizing Enzymes. Enzyme Microbial Technology. 50-59.

Mozhaev, V.V., N.S. Melik-Nubarov, V.A. Siksnis and K. Martinek. (1990). Strategy for Stabilizing Enzymes. Part Two: Increasing Enzyme Stability by Selective Chemical Modication. Biocatalysts. 173: 189-196.

Mu W, Zhang W, Feng Y, Jiang B, Zhou L (2012). Recent advances on applications and biotechnological production of D-psicose. Appl Microbiol Biotechnol 94:1461–1467.

Murray, R.K., Granner, D.K., and Victor, R.W. (2009). Biokimia Harper. EGC Penerbit Buku Kedokteran Jakarta. 68-69.

Oshima H, Kimura I, Izumori K .(2006). Psicose contents in various food products and its origin. Food Sci Technol Res 12:137–143.

Page, D.S. (1997). Prinsip-Prinsip Biokimia. Erlangga. Jakarta. 465 halaman.

Park, C.-S., et al., Production of D-psicose from D-fructose by whole recombinant cells with high-level expression of D-psicose 3-epimerase from Agrobacterium tumefaciens, J. Biosci.

Bioeng., (2015), http: //dx.doi.org/ 10.1016/ j.jbiosc. 2015. 06. 010

Poedjiadi, A.(1994). Dasar-dasar Biokimia. Jakarta.UI-Press. 155, 158-160.

Pohl, T. (1990). Concentration of protein removal of salute dalam M.P. Deutscher, Methods of Enzymology: Guide to Protein Purification.Vol :182. Academic Press. New York.

25

Reed, G. (1975). Enzymes in Food Processing. Academic Press. New York. 212.

Reese, E.T. (1976). History of cellulase program at U.S. Army Natick Development Center. Biotechnology and Bioengineering. Vol: 6. John Wiley & Sons Inc.

Rodwell, V.W. (1987). Harper’s Review of Biochemistry. EGC Kedokteran. Jakarta.

Scopes, R.K. (1993). Protein Purification Principle and Practice, Edisi Ke-3, Springer Verlag, New York.

Shahib, N. (2005). Biologi Molekular Medik I. Unpad Press. Bandung. 164-167.

Smith BJ. (1984). SDS polyacrylamide gel electrophoresis of proteins. Di dalam Walker JM,editor. Proteins. Methoda in Molecular Biology.

Suhartono, M.T. (1989). Enzim dan Bioteknologi. PAU IPB. Bogor.

Sun Y, Hayakawa S, Ogawa M, Fukada K, Izumori K. (2008). Influence of a rare sugar, interfacial residue . https://doi.org/10.1016/j.ijbiomac.2018.02.036.

Walsh, G., and D.R. Headon. (1994). Protein Biotechnology. John Willey and Sons. New York.

Winarno, F.G. (1986). Enzim Pangan dan Gizi. PT. Gramedia Pustaka Utama. Jakarta.

155 halaman.

Wirahadikusumah, M. (1997). Biokimia: Protein, Enzim dan Asam Nukleat. ITB. Press.

Bandung. 91 halaman.

Yang, Z., D. Michael, A. Robert, X.Y. Fang and J.R. Alan . (1996). Polyethylene Glycol-Induced Stabilization of Subtilisin. Enzyme Microbial Technology.. 18: 82-89.

Zhang, L. Jiang, B. Mu, W. Zhang, T. (2008). Characterization of D-tagatose 3 epimerase from Rhodobacter sphaeroides SK011. J. Biotechnol. 2008, 136S, S726. (18).

26 Zhang, L.; Mu, W.; Jiang, B. Zhang, T. (2009). Characterization of epimerase from Rhodobacter sphaeroides that converts Dfructose into D- psicose.

Biotechnol. Lett. 2009, 31, 857–862.

Zhang W, Fang D, Xing Q, Zhou L, Jiang B, et al. (2013). Characterization of a Novel Metal-Dependent D-Psicose 3-Epimerase from Clostridium scindens 35704. PLoS ONE 8(4): e62987. doi:10.1371/journal.pone.0062987.

Zhu Y, Men Y, Bai W, Li X, Zhang L, Sun Y, Ma Y .(2012). Overexpression of D-psicose 3-epimerase from Ruminococcus sp. in Escherichia coli and its potential application in D-psicose production. Biotechnol Lett 34:1901–1906.

Zijie Li, Yahui Gao, Hideki Nakanishi, Xiaodong Gao, Li Cai. (2013) Biosynthesis of rare hexoses using microorganisms and related enzymes. Beilstein J.Org.

Chem.2013,9,2434-2445. Doi:10.3762/bjoc.9.281.

Zunino SJ (2009). Type 2 diabetes and glycemic response to grapes or grape products. J Nutr 139:1794S–1800S.

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