糖代谢途径全解

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AcCOA:乙酰辅酶A;CIT:柠檬酸;DHAP:磷酸二羟丙酮;E4P:4-磷
酸赤藓糖;F6P:6-磷酸果糖;F1,6P:1,6-二磷酸果糖;FUM:延胡索酸;GA3P:3-磷酸甘油醛;G3P:3-磷酸甘油;G6P:6-磷酸葡萄糖;G6PA:6-
磷酸葡萄糖酸;α-KG:α–酮戊二酸;LAC:乳酸;MAL:苹果酸;OAA:草酰乙酸;PEP:磷酸烯醇式丙酮酸;3PG:3-磷酸甘油酸;PYR:丙酮
酸;Ru5P:5-磷酸核酮糖;R5P:5-磷酸核桃;SUC:琥珀酸;SUCCoA:
琥珀酰辅酶A;X5P:5-磷酸木酮糖.
胞内的代谢反应方程
糖酵解途径Glycolysis pathway
rl GLU+ATP→G6P+ADP
r2 G6P→F6P
r3 F6P+ATP→DHAP+G3AP+ADP
r4 DHAP+NADH→G3P+NAD
r5 G3P+ADP→GL Y+A TP
r6 GA3P+NAD+ADP→3PG+NADH+A TP
r7 3PG→PEP
r8 PEP+ADP→PYR+ATP
三羧酸循环Tricarboxylic acid cycle
r11 PYR+CoA+NAD→AcCoA+NADH+CO2
r12 PYR+ATP+CO2→OAA+ADP
r14 OAA+AcCoA→ICI+CoA
r15 ICI+NAD→α-KG+NADH+CO2
r16 α-KG+CoA+NAD→SucCoA+NADH+CO2
r17 SucCoA+ADP+Pi→SUC+ATP+CoA
r18 SUC+FAD→FUM+FADH2
r19 FUM→MAL
r20 MAL+NAD→OAA+NADH
磷酸戊糖途径Plentose phosphate pathway
r21 G6P+NADP→G6PA+NADPH
r22 G6PA+NADP→Ru5P+NADPH+CO2
r23 Ru5P→0.67X5P
r24 Ru5P→0.33R5P
r25 X5P+R5P→F6P+E4P
r26 X5P+E4P→F6P+GA3P
副产物形成By-products synthesis
r9 PYR+NADH→Lactate+NAD
r10 PYR+NADH→Ethanol+CO2+NAD
r13 PYR→PyrExt
氧化磷酸化Oxidative phosphorylation
NADH+0.5O2+(P/O)ADP→NAD+(P/O)ATP
FADH2+0.5O2+0.5(P/O)ADP→0.5(P/O)A TP+FAD
用于维持的ATP消耗ATP consumption for maintenance
ATP→ADP+Pi
生物量形成Biomass formation
0.067G6P+0.064R5P+0.009GA3P+0.065PG+0.050PEP+0.176P
yr+0.095OAA+0.102KG+0.249AcCoA+1.142NADPH+0.157NA
D+3.82ATP→Biomass+1.142NADP+0.157NADH+0.127CO
2+3.8-2ADP
图4 补料发酵过程中胞浆3-磷酸甘油脱氢酶、6-磷酸葡萄糖脱氢酶、丙酮酸激酶酶活的时序变化Fig. 4 Time courses of the activity of ctGPD, G6PDH and PYK in fed-batch culturectGPD:胞浆3-磷酸甘油脱氢酶;G6PDH:6-磷酸葡萄糖脱氢酶;PYK:丙酮酸激酶ctGPD: cytoplasmic glycerol 3-phosphate dehydrogenase; G6PDH: glucose-6-phosphate dehydrogenase; PYK: pyruvate kinase。

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