eIF5 is a GTPase-activating protein, which helps the large ribosomal subunit associate with the small subunit. It is required for GTP-hydrolysis by eIF2.
eIF5A is the eukaryotic homolog of EF-P. It helps with elongation and also plays a role in termination. EIF5A contains the unusual amino acid hypusine.
eIF5B is a GTPase, and is involved in assembly of the full ribosome. It is the functional eukaryotic analog of bacterial IF2.