Recently,CaMBP10 was identified as a plant lipid transfer protein(LTP).In the study,four leaves old cabbages were treated with exogenous jasmonic acid(JA),JA plus LTP,fungal elicitor,200 mmol/L NaCl and 20% PEG respectively for understanding the functions of CaMBP10 in vivo.The expression of CaMBP10 was determined by using semi-quantitative RT-PCR.The results showed that the expressions of CaMBP10 were dramatically up-regulated in different levels under indicated conditions.It demonstrated that CaMBP10 was involved in biotic and abiotic stress response.
植物转脂蛋白(plant lipid transfer proteins,LTPs)是高等植物中广泛存在的多基因编码的小分子碱性蛋白.本研究室已经证明白菜和豌豆LTPs可分别被内源胞浆可溶性和膜结合钙依赖性蛋白激酶(calcium-dependent protein kinase,CDPK)磷酸化.为深入研究CDPK对白菜钙调素结合蛋白10(calmodulin-binding protein-10,CaMBP10)的磷酸化性质及特征,本文从拟南芥可溶性蛋白粗提物中检测到1个分子量约为54 kD的CDPK对CaMBP10有磷酸化作用.研究表明,组蛋白可增强CDPK对CaMBP10的磷酸化活性,促进磷酸化进程.而且组蛋白和Ca2+对CDPK具有协同调节效应,二者共同作用时比Ca2+单独作用时,激酶的活力增强约12倍.此外,不同组蛋白对CDPK的激活能力不同,组蛋白1对该激酶活性的激活能力要比组蛋白3高约8倍.
