Not required for exponential growth; probably functions in vegetatively growing cells, maybe required for accurate translation under stress conditions. Part of the ribosome (presumably the 50S subunit) under heat-stress but not control growth conditions. Binds 5S rRNA. Expressed at the end of exponential growth under conditions in which the enzymes of the TCA cycle are repressed. By heat shock, salt stress, oxidative stress, glucose limitation and oxygen limitation. Cells sporulate poorly at 48 degrees Celsius. Belongs to the bacterial ribosomal protein bL25 family. CTC subfamily.