The present invention relates to a method for detecting protein-protein interactions in living cells, and more particularly, to a method for providing cells comprising a first construct and a second construct, wherein the first construct comprises a polynucleotide encoding a first fusion protein which comprises a bait protein, a first fluorescent protein and a CBD (cellulose-binding domain) protein, and wherein the second construct comprises a polynucleotide encoding a second fusion protein which comprises a prey protein and a second fluorescent protein so as to allow formation of inclusion bodies, and detecting interactions between the bait protein and the prey protein that are displayed by inclusion bodies, a method for isolating the prey protein bound to the bait protein using the cells comprising the constructs, the cells, and a kit for detecting protein-protein interactions, comprising the constructs.