p21活化蛋白激酶(p21-activated protein kinase,PAK)是一类高度保守的丝氨酸/苏氨酸蛋白家族,是Rho家族小GTP酶的效应蛋白,参与多种信号通路传导。PAK4是PAK家族中最有代表性的成员,通过磷酸化下游底物,调控细胞骨架重组、细胞增殖和...p21活化蛋白激酶(p21-activated protein kinase,PAK)是一类高度保守的丝氨酸/苏氨酸蛋白家族,是Rho家族小GTP酶的效应蛋白,参与多种信号通路传导。PAK4是PAK家族中最有代表性的成员,通过磷酸化下游底物,调控细胞骨架重组、细胞增殖和细胞周期进展等。PAK4过表达见于胰腺癌、胃癌和卵巢癌等多种肿瘤,参与肿瘤发生和肿瘤迁移等过程。研究PAK4的结构、作用机制对于揭示细胞周期调控和肿瘤生物学行为有重要价值。本文阐述和归纳了PAK4的结构、激活过程及其在细胞骨架、细胞周期进展中的生物学作用,并综述了PAK4调控妇科肿瘤发生发展以及PAK4抑制剂的最新研究进展。展开更多
Melatonin(MT)is a low molecular weight compound with multiple biological functions in plants.It is known to delay leaf senescence in various species.However,no data are available on the MT signaling pathway in posthar...Melatonin(MT)is a low molecular weight compound with multiple biological functions in plants.It is known to delay leaf senescence in various species.However,no data are available on the MT signaling pathway in postharvest vegetables.This study demonstrates that MT increases cGMP concentration and the expression of the cGMP synthesis gene BcGC1 in pak choi.The c GMP inhibitor LY83583 destroys effect of MT delaying the leaf senescence.LY83583 also prevents MT treatment from reducing the expression of chlorophyll metabolism-related genes(BcNYC1,BcNOL,BcPPH1/2,BcSGR1/2,and BcPAO)and senescence genes(BcSAG12 and BcSAG21).It also inhibits MT from reducing the activity of the key chlorophyll catabolism enzymes Mg-dechelatase,pheophytinase,and pheide a oxygenase.Thus,the ability of MT to maintain high levels of chlorophyll metabolites is also destroyed.The Arabidopsis c GMP synthetic gene mutant atgc1 was used to confirm that delayed leaf senescence caused by MT is mediated,at least in part,by the second messenger c GMP.展开更多
文摘p21活化蛋白激酶(p21-activated protein kinase,PAK)是一类高度保守的丝氨酸/苏氨酸蛋白家族,是Rho家族小GTP酶的效应蛋白,参与多种信号通路传导。PAK4是PAK家族中最有代表性的成员,通过磷酸化下游底物,调控细胞骨架重组、细胞增殖和细胞周期进展等。PAK4过表达见于胰腺癌、胃癌和卵巢癌等多种肿瘤,参与肿瘤发生和肿瘤迁移等过程。研究PAK4的结构、作用机制对于揭示细胞周期调控和肿瘤生物学行为有重要价值。本文阐述和归纳了PAK4的结构、激活过程及其在细胞骨架、细胞周期进展中的生物学作用,并综述了PAK4调控妇科肿瘤发生发展以及PAK4抑制剂的最新研究进展。
基金supported by the National Natural Science Foundation of China(Grant No.32001451)Jiangsu Agriculture Science and Technology Innovation Fund[Grant No.CX(20)1008]。
文摘Melatonin(MT)is a low molecular weight compound with multiple biological functions in plants.It is known to delay leaf senescence in various species.However,no data are available on the MT signaling pathway in postharvest vegetables.This study demonstrates that MT increases cGMP concentration and the expression of the cGMP synthesis gene BcGC1 in pak choi.The c GMP inhibitor LY83583 destroys effect of MT delaying the leaf senescence.LY83583 also prevents MT treatment from reducing the expression of chlorophyll metabolism-related genes(BcNYC1,BcNOL,BcPPH1/2,BcSGR1/2,and BcPAO)and senescence genes(BcSAG12 and BcSAG21).It also inhibits MT from reducing the activity of the key chlorophyll catabolism enzymes Mg-dechelatase,pheophytinase,and pheide a oxygenase.Thus,the ability of MT to maintain high levels of chlorophyll metabolites is also destroyed.The Arabidopsis c GMP synthetic gene mutant atgc1 was used to confirm that delayed leaf senescence caused by MT is mediated,at least in part,by the second messenger c GMP.
