The invention relates to a method and a prokaryotic cell for identifying a compound, which interferes with ribosome biogenesis, assembly and/or degradation. The cell expresses a first fusion protein comprising a first ribosomal protein, an amino acid linker and a first fluorescent protein, and a second fusion protein comprising a second ribosomal protein, an amino acid linker and a second fluorescent protein. The invention further relates to a gene construct comprising a first element encoding a first ribosomal protein fused to a first fluorescent protein by an amino acid linker, and a second element encoding a second ribosomal protein fused to a second fluorescent protein by an amino acid linker.