(2)6-磷酸葡萄糖酸内酯转变为 6-磷酸葡萄糖酸 OH H20 H一C一OH HO一C一H C一H 内酯酶 H-C-OH H-C-OH l actonase H-C-OH H- CH2OPO3H2 CH2OPO3H2 6-磷酸葡萄糖酸内酯 6-磷酸葡萄糖酸 6-phosphogluconate 6-phosphoglucono-6-lactone
(2) 6-磷酸葡萄糖酸内酯转变为 6-磷酸葡萄糖酸 C C C C C CH2OPO3H2 H OH HO H H OH H O O 6-磷酸葡萄糖酸内酯 6-phosphoglucono-δ-lactone OH OH C C C C C CH2OPO3H2 H OH HO H H OH H O 6-磷酸葡萄糖酸 6-phosphogluconate H2O 内酯酶 lactonase
(3)6-磷酸葡萄糖酸转变为 5-磷酸核酮糖 NADP+ OH CH2OH NADPH+H+ H-C-OH H-COH C=0 HO一C-H C=0 H一COH H-C-OH H-C-OH H OH HCOH H-C一OH CH2OPO3H2 CH2OPO3H2 CH2OPO3H2 5一磷酸核酮糖 6-磷酸葡萄糖酸 ribulose 5-phosphate 6-磷酸葡萄糖酸脱氢酶 6-phosphogluconate 6-phosphogl uconate dehydrogenase
(3) 6-磷酸葡萄糖酸转变为 5-磷酸核酮糖 CO2 OH OH C C C C C CH2OPO3H2 H OH HO H H OH H O 6-磷酸葡萄糖酸 6-phosphogluconate OH OH C C C C C CH2OPO3H2 H OH HO H H OH H O OH CH2OH C C C CH2OPO3H2 O H OH H NADP+ NADPH+H+ OH CH2OH C C C CH2OPO3H2 O H OH H 5-磷酸核酮糖 ribulose 5-phosphate 6-磷酸葡萄糖酸脱氢酶 6-phosphogluconate dehydrogenase
(4)三种五碳糖的互换 CH2OH CH2OH CHO C=0 H OH 差向酶 异构酶 HO CH H OH H-C OH H一COH H C-OH H—COH CH2OPO3H2 CH2OPO3H2 CH2OPO3H2 5-磷酸木酮糖 5-磷酸核酮糖 5-磷酸核糖 xylulose 5-phosphate ribulose 5-phosphate ribose 5-phosphate
(4) 三种五碳糖的互换 OH CH2OH C C C CH2OPO3H2 O H OH H 5-磷酸核酮糖 ribulose 5-phosphate H OH OH CHO C C C CH2OPO3H2 H OH H 5-磷酸核糖 ribose 5-phosphate 异构酶 OH CH2OH C C C CH2OPO3H2 O HO H H 5-磷酸木酮糖 xylulose 5-phosphate 差向酶
(5)二分子五碳糖的基团转移反应 CH2OH CHO C=0 转酮醇酶 (TPP)H-C一OH CH2OH HOCH CH2OPO3H2 C=0 H—C—OH 3-磷酸甘油醛 HO-C一H glyceraldehyde 3-phosphate H-C一OH CH2OPO3H2 CHO 5-磷酸木酮糖 H—C—OH H一C一OH ribulose 5-phosphate H—C—OH HCOH H一C一OH CH2OPO3H2 CH2OPO3H2 7-磷酸景天糖 sedoheptulose 5-磷酸核糖 7-phosphate ribose 5-phosphate
（5) 二分子五碳糖的基团转移反应 OH CH2OH C C C CH2OPO3H2 O HO H H 5-磷酸木酮糖 ribulose 5-phosphate H OH OH CHO C C C CH2OPO3H2 H OH H 5-磷酸核糖 ribose 5-phosphate OH CHO C CH2OPO3H2 H 3-磷酸甘油醛 glyceraldehyde 3-phosphate HO H H OH OH C C C C CH2OPO3H2 H OH H CH2OH C O 7-磷酸景天糖 sedoheptulose 7-phosphate
(6)七碳糖与三碳糖的基团转移反应 CH2OH CHO C=0 HC—OH HO-C-H 转醛醇酶 H-C-OH CH>OH H-C-OH Mg2+ CH2OPO3H2 或 C=0 OH n2+4-磷酸赤藓糖 HO-C-H erythrose 4-phosphate H C-OH CHO H-COH CH2OPO3H2 H OH H OH 7-磷酸景天糖 CH2OPO3H2 sedoheptulose 7-phosphate CH,OPO3H2 3-磷酸甘油醛 glyceraldehyde 3-phosphate 6-磷酸果糖 fructose 6-phosphate
(6)七碳糖与三碳糖的基团转移反应 HO H H OH OH C C C C CH2OPO3H2 H OH H CH2OH C O 7-磷酸景天糖 sedoheptulose 7-phosphate OH CHO C CH2OPO3H2 H 3-磷酸甘油醛 glyceraldehyde 3-phosphate OH CHO C C CH2OPO3H2 H OH H 4-磷酸赤藓糖 erythrose 4-phosphate H OH OH C C CH2OPO3H2 H HO H CH2OH C C O 6-磷酸果糖 fructose 6-phosphate Mg2+ 或 Mn2+