MRTO4, also known as MRT4, belongs to the ribosomal protein L10P family. MRTO4 is a ribosomal P0-like protein showing extensive sequence similarity to the ribosomal P0 protein. The precise function of MRTO4 is currently unknown. It appears to be involved in mRNA turnover and ribosome assembly. MRTO4 acts as a trans-acting factor which modulates the assembly of the pre-60S particle.