[Study of interaction between PRAS40 and 14-3-3 proteins by using yeast two-hybrid system]

PRAS40, a proline-rich Akt substrate of 40 kD, is 14-3-3 binding protein. To study the interaction between PRAS40 and 14-3-3 isoforms, We constructed the expression vector pEG-PRAS40 (DNA-binding plasmid) and pJG-PRAS40 (transcriptional activity plasmid) in yeast using gateway cloning technology, then the plasmid of pEG-PRAS40/pJG-PRAS40 was co-transformed into yeast EGY48 strain with each pJG-14-3-3 /pEG-14-3-3 isoform plasmid. The co-transformation were tested by nutrition limitation growth analysis, beta-galactosidase color assay was used to study the interaction degree between PRAS40 and 14-3-3 isoforms. We confirmed successfully the construction of pJG-PRAS40 and pEG-PRAS40 with enzyme digestion. four 14-3-3 isoforms were found interacting with PRAS40 using yeast two-hybrid assay, the interaction degree of Epsilon was stronger than beta and zeta, tau was the weakest. Our result will be used to further study the biological function of PRAS40 and 14-3-3 as new drug target.