Abstract:Mitogen-activated protein kinase (MAPK) plays a central role in transfer information from diverse receptors/sensors to a wide range of cellular responses in plants. CbMAPK3 cDNA was amplified by RT-PCR from Chorispora bungeana leaf, then was cloned into pET-30a vector to construct recombinant prokaryotic expression vector pET-30a-CbMAPK3. The pET-30a-CbMAPK3 was transformed to E.coli strain of BL21. After induced by IPTG, a 46 kD recombinant protein was expressed and separated by SDS-PAGE electrophoresis and detected by western blot. The research provides a base for further studying on the protein structure and function of CbMAPK3.