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4.1. Introduction CHAPTER 4 SUSPENSION RECOMBINANT YEAST CULTURE This part of the research was focused on the foiiowing questions: 1) What is the growth characteristics of the recombinant yeast? 1s the production of the recombinant protein growth-associated? 2) What is the nature of the plasmid instability in the recombinant yeast? Are the 2 based yeast shunle piasmids stable? And if not, to what emt? 3) How do fermentation conditions, growth rates and growth media affect the plasaid stability and the recombinant protein production? 4) How are the metaboüc pathways in the yeast related to the recombinant protein formation. 5) What is the advantages and disadvantages of asing an airlift bioreactor for the recombinant yeast fementatior 4 3 Batch Suspension Fermentation 42.1, Batch Culture in Airüft Bioreactor (ALR) Batch suspension cultrms were carried out in a 15 Iitu airiift bionxctor (1.2 iitet working volume) at 30 O C and an aeration rate of 1.0 VVM. Figure 4.1 shows a ~ypical time course of batch culture for ghcoamyiase secretion using YPG nonselective medium Celi pwth was typicaily diauxic. Mtialiy glucose concentration was high, after a short lag
Cell Maso, Glucose and EthanoI(g1L) O N P O > O o Ô 6 ~ ~ ~ ~ Glucoamylase Concentration (unitslL) and Fraction of PBC (%)
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BIOREACTOR STUDIES OF HETEROLOGOUS
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nie University of Waterloo requin%
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ate depended on activities of the p
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Acknowiedgments Fmt of aü, 1 am ve
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2.6. Concluding Rernarks ..........
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5.3.3. Simlilated Results for Prese
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Table 1.1. Table 1.2. Table 1.3. Ta
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Figure 2.1. Figure 3.1. Figure 3.2.
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during Continuous Culture in Airlif
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Figure 5.3. Comparison between Mode
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Cell Systern at Glucose Feed Concen
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a .......... growth ratio (dimensio
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Y, ... ethanol yield for fermentati
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foreign plasmids. One major chalien
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than the denanired, inclusion body
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Table 1.2. Strategies for Enhancing
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Table 1.3. Host Cek, Pfasmids, Gene
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1.4. Immo bilized-Cell Bioreactors
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1. Study the gmwth characteristics,
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plasmid are used; or chromaromal DN
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2.2.1. Genetic Factors 2.2.1.1. Pid
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1- fkquently than a plasmid with Io
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Da Silva and Bailey (1991) used the
Page 47 and 48: LEU2 or TRPI is cloned into the aux
Page 49 and 50: eported reduced stabiliity in the s
Page 51 and 52: on metabolic pathways. In the ferme
Page 53 and 54: OC), oniy about 35% of the populati
Page 55 and 56: loss @) is dehned as the probabilit
Page 57 and 58: + s Dilution Rate = p' = CI,- - K*+
Page 59 and 60: concentration couid Iead to coexist
Page 61 and 62: that factors other than immobiiizat
Page 63 and 64: earing and plasmid-tke =Ils. Gel be
Page 65 and 66: productivity irrespective of the mo
Page 67 and 68: inactive and useless. The problern
Page 69 and 70: Aerobic fermentation osing iamnobih
Page 71 and 72: (ranghg h m 1 to 7) on citric acid
Page 73 and 74: celi fraction decreases monotonicai
Page 75 and 76: (1987) model aliows for plasmid ins
Page 77 and 78: affect plasmid stability have ben o
Page 79 and 80: CEtAPTER 3 MATERIALS AND METHODS 3.
Page 81 and 82: stiU deleted hm the plasmid. Such p
Page 83 and 84: 1) Reagent solution preparation was
Page 85 and 86: nonse1ective agar plates, but only
Page 87 and 88: working Liquid volume. The aeration
Page 89 and 90: 3.5. UNnobilized Ceil Culture 35.1.
Page 91 and 92: 3.52 Cd Lmmobiiization Yeast attach
Page 93 and 94: 3.6. Experimental Error and Reprodu
Page 95 and 96: -0-Cell(1) +Total CeII (2) 4- Ethan
Page 97: * . I I a O 2 4 6 8 10 12 14 Batche
Page 101 and 102: 4.2.2. Batch CuIture in Stirreà-Ta
Page 103 and 104: [t ~lucoamylase (ALR) -e Glucoamyla
Page 105 and 106: The finai giucoamyiase concentratio
Page 107 and 108: Bentley and Kompala, 1989; Satyagal
Page 109 and 110: 160 First ExponenUaI Phase 1 -c ALR
Page 111 and 112: Figure 4hl. Pathways of Yeast Intem
Page 113 and 114: fermentation (using nitrogen spargi
Page 115 and 116: 43. Continuous Suspension Culture C
Page 117 and 118: Figure 4.9. Continuous Suspension C
Page 119 and 120: 1 +Enzyme +Fradlan of PBC +CeIl Mas
Page 121 and 122: Figures 4.12 and 4.13 show that by
Page 123 and 124: Fi- 4.13. Cornparison of Glu~iase C
Page 125 and 126: where 6 = p- - p' + pp*, which is a
Page 127 and 128: Figure 4-14. Effeds of Dilution Rat
Page 129 and 130: Impoolsup et ai. (1989a) and Hardji
Page 131 and 132: Figure 4.16. dB/dt versus B Plots a
Page 133 and 134: Figure 4.17. Totai Cell Mas at Diff
Page 135 and 136: another recombinant yeast (impoolsu
Page 137 and 138: other recombinant yeast under nonse
Page 139 and 140: 4.3.4. Effixt of Dilution Rate On R
Page 141 and 142: Figure 4.18- Etlects of Mluiioa Rat
Page 143 and 144: Number of Generations - - - - - - *
Page 145 and 146: B Table 4.5. Metabolic Pathway Anal
Page 147 and 148: concentration. But this may be more
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[+ Enzyme (ALR) + Enzyme (STR) +Fra
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necessary for host ce& to grow in t
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Glucoamylase ConcentraUon (unltsll)
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[a Selective Medium A Nonseiective
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5.1 Introduction CHAPTER 5 MODELING
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handle. excess glucose is femented
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The carbon fluxes h m the three met
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53. Modei Simulation in Batch CuItu
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Table 5.1. Summary of Parameters fo
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1 n Glucose o Cell Mass O Ethano1 A
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detennined in the cunent study, the
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Figure 5.4. Cornparison between Mod
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equations are üsted in Appendix G.
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a dilution rate at which the giucoa
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[ o Expetfmental data -Simuiated mt
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The effixts of dilution rate on the
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Ttme (hrs) 1 a Enzyme A Phsrnid-Bea
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It may take several generations for
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understanding of the nature of the
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On the other hand. the net accumula
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Differentiating Equation (6.20) res
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Enyme collcentration m the t>ioreac
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Glucoamylase Concentration (units/L
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50 100 150 200 Time (hrs) 1 O Free
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F i 6.6. Cornparison of Fnx Cd Mars
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. - O 50 100 150 200 250 nme (hrs)
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Nasi et ai.. 1988) and recombinant
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estimated by using Equation (6.24)
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[a lmmobilked System O Free System
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oxidation pathway. W~th increasing
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O 50 100 150 200 250 300 Tirne (hrs
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epeated batch fermentations, the fe
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Glucoamylase Concentration (unitslL
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6) Suitable for repeated-batch and
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ecause glucose fermentation dominat
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cells. Tests of the proposed model
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7.2. Recommendations The foUowing f
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APPENDIX A: PLASMID MAP FOR pGAC9 l
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where Bi (Biot number) = - ks De @
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APPENDK C. EFFECTS OF INITIAL GLUCO
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Figure C.2. Effect of Initial Gluco
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Figure C.4 Effect of Initial Glucos
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APPENDLX D. COMPARISON OF ORIGINAL
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(continue)
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(continue)
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(continue)
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E.2. Batch Fermentation with Recomb
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(continue)
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(continue) tfhJ 0.5 10.5 12.75 12.5
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(continue)
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E.3.2. Experimental Data (Parker an
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Run No: CALE (Selected Strain. D =
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Run No: CALR 5 (Original Suain, D =
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Run No: CSTR3 (Selected Suain, D =
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(continue)
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Run No: CICR2 (Selected Suain, D =
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Run No: CiCR4 (Selected Suain, D =
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Eh. Repeated Batch Culture in hmobi
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APPENDIX F. C CODE FOR THE PROPOSED
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* the initial data */ /* gening the
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* getting the founh term in R-K met
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I*Plasrnid-bearing ceU concentratio
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* Func tion C 1 */ îloat C l(float
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APPEMIM G. EXAMPLES OF MAPLE V CODE
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REFERENCES Ataai. MM. and Shuler. M
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Caunt, P.. hpoolsup, A.. and Greenf
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cuitanes of E. coli BZ18@TG 201) wi
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Gabrieisen. O.S. et aL (1990), Effi
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Huang, C-T., Peretti, S.W., and Bry
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Kim, B.G. and Shuler, M.L. (1990a),
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Lee, S.B.. Ryu, D.D.Y., seigel, R,
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Nasri, M., Sayadi. S.. Barbotin, J.
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Pin, S.J. and Kmwski. W.M. (1970),
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Seo, I-H. and Bailey. J.E. (1985).
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Tumer. B.G., Avgerinos G-C.? Melnic
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Yu, J. and Tang, X (Editor, 1991),
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