ABI2, a second protein phosphatase 2C involved in abscisic acid signal transduction in Arabidopsis

被引:170
作者
Rodriguez, PL [1 ]
Benning, G [1 ]
Grill, E [1 ]
机构
[1] Tech Univ Munich, Lehrstuhl Bot, D-80333 Munich, Germany
关键词
abscisic acid; protein phosphatase 2C; signal transduction; ABI2; ABI1;
D O I
10.1016/S0014-5793(97)01558-5
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The abi2-1 (abscisic acid insensitive) mutant of Arabidopsis thaliana shows abscisic acid (ABA) insensitivity with respect to seed germination and vegetative ABA responses, We identified the ABI2 gene by a combination of positional mapping and homology to ABI1. The ABI2 protein shoes 80% amino acid sequence identity to ABI1, a protein phosphatase 2C (PP2C) involved in ABA signaling. The mutation that confers the abi2-1 phenotype is equivalent to the mutation previously identified in abi1-1 and the resulting Gly(168)Asp abi2 protein shows a reduced PP2C activity. Thus, a pair of highly homologous PP2Cs regulate ABA signaling. (C) 1998 Federation of European Biochemical Societies.
引用
收藏
页码:185 / 190
页数:6
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