Q历史 ◆20世纪30年代初,DAM发现无脂饲料喂 养的鸡出现一种出血综合症,从而发现 维生素K。 ◆1939年确定为维生素K。 ◆40年代证实4-羟香豆素是维生素K的拮抗 物
历史 20世纪30年代初,DAM发现无脂饲料喂 养的鸡出现一种出血综合症,从而发现 维生素K。 1939年确定为维生素K。 40年代证实4-羟香豆素是维生素K的拮抗 物
吸收、运转、储存和更新 ◆随脂质在肠道淋巴系统吸收 ◆经胆汁有粪便排除,部分经尿排除; ◆大肠的厌氧菌可合成维生素K;
吸收、运转、储存和更新 随脂质在肠道淋巴系统吸收 经胆汁有粪便排除, 部分经尿排除; 大肠的厌氧菌可合成维生素K;
三依赖的蛋白质 ◆凝血因子 Factors: II (prothrombin), VII, IX,X, protein C protein S, protein Z 骨骼生长因子 骨钙素 Osteocalcin= Bone Gla protein Matrix Gla protein (MGP) ◆细胞生长及信息传递调节因子 Growth arrest-specific gene(Gas6) Proline-rich gla protein (PRGP-1, PRGP-2) ◆其他未知功能蛋白 found in kidney, liver, spermatozoa, urine Vitamin K dependent(VKD)Y Carboxylase
VK依赖的蛋白质 凝血因子 – Factors: II (prothrombin), VII, IX, X, protein C, protein S, protein Z 骨骼生长因子 – 骨钙素Osteocalcin = Bone Gla protein – Matrix Gla protein (MGP) 细胞生长及信息传递调节因子 – Growth arrest-specific gene (Gas6) – Proline-rich gla protein (PRGP-1, PRGP-2) 其他未知功能蛋白 – found in kidney, liver, spermatozoa, urine • Vitamin K dependent (VKD) gCarboxylase
Intrinsic pathway Extrinsic pathway Blood vessel damage causes Tissue injury causes initiation f the cle initiation of the clotting ng releas ing certain bloc process proteins Vitamin K acts af Vitamin K acts at two of these steps one of these steps Prothrombin activating factor Preprothrombin Prothrombin rombin Vitamin K Fibrinogen acts at this step (soluble rin Clot formed protein) (insoluble ng ote of fibrin trap and huid
Q作用机理(参与羧化反应 Vitamin K Mechanism of Action Prothrombin Precursor Prothrombin HN-CH-cO HN-cH一co 阝cF CH Glutamic Acid Y-Carboxyglutamic Acid Y CH? CoOH HOOC COOH Carboxylase 0 CH H2 R Reduced vitamin Oxidized Vitamin K
作用机理 (参与羧化反应)
Vitamin K-dependent carboxylation reaction VK是谷氨酰羧化酶的辅酶) Precursor Product CO, O2 Glutamyl y-Carboxy CH CH residues glutamyl residues CHb lamina HC一COOH COOH COOH
Vitamin K-dependent carboxylation reaction (VK 是谷氨酰羧化酶的辅酶) Glutamyl residues CO2 O2 Vitamin K g-Carboxyglutamyl residues CH2 HC COOH COOH CH2 CH2 COOH Precursor Product