Biochemistry of Fertilization and Early Development

PI提出，海胆受精时钙升高的一个主要后果是激活钙调素依赖酶，即产生NADP的NAD激酶。钙的升高也激活葡萄糖-6-磷酸脱氢酶，使NADP迅速还原为NADPH。由此产生的NADPH/NADP比率的增加，然后改变细胞的氧化还原平衡，有利于还原，这对蛋白质合成激活有影响。其他监管变化源于钙的上涨。本研究的具体目标是1)确认或否定NADPH变化在体内调节蛋白质合成中的作用，2)确定NADPH/NADP比值的变化是否通过蛋白质二硫基团的改变而起作用，如通过硫氧还蛋白或其他蛋白质氧化还原酶系统。

The PI proposes that a major consequence of the calcium rise at fertilization in the sea urchin isthe activation of the calmodulin dependend enzyme, NAD kinase, which produces NADP. The calcium rise also activates Glucose-6-phosphate dehydrogenase, with the result that the NADP is rapidly reduced to NADPH. The resultant increase in the NADPH/NADP ratio then shifts the redox poise of the cell to favor reduction which has consequences for protein synthesis activation. Other regulatory changes emanate from the calcuim rise. The specific goals of the proposed research are to 1) affirm or negate the role of the NADPH change in regulating protein synthesis in vivo and 2) determine whether the NADPH/NADP ratio change is, in addition, acting through alteration of protein disulphide groups, as through a thioredoxin or other protein oxidoreductase system.