Subunit composition of Prokaryotic ribosomes
Ribosome
subunits comprise one or two rRNA molecules, plus a
variable number of proteins.
Combinations of rRNAs and
proteins
typically have a smaller (as measured by sedimentation
rate (S))
than their component parts, due to condensation. In
eukaryotes, the complete 80S monosome comprises a 40S Small Subunit (SSU)
that includes the 18S rRNA,
and a 60S Large Subunit
(LSU)
that includes the 28S, 5.8S, and 5S rRNAs. Prokaryotic ribosomes
are somewhat smaller, but include analogous subunits.
Text ©2024 by Steven M.
Carr