This protein associates with 70s ribosomes and converts them to a dimeric form (100S ribosomes) which appear during the transition from the exponential growth phase to the stationary phase of Escherichia coli cells.

1: Structure and probable genetic location of a ribosome modulation factor associated with 100S ribosomes in stationary-phase Escherichia coli cells. Wada A, Yamazaki Y, Fujita N, Ishihama A; Proc Natl Acad Sci U S A 1990;87:2657-2661. PMID:2181444

2: Regulation of the Escherichia coli rmf gene encoding the ribosome modulation factor: growth phase- and growth rate-dependent control. Yamagishi M, Matsushima H, Wada A, Sakagami M, Fujita N, Ishihama A; EMBO J 1993;12:625-630. PMID:8440252