An essential GTPase that binds both GDP and GTP, with rapid nucleotide exchange. Plays a role in 16S rRNA processing and 30S ribosomal subunit biogenesis and possibly also in cell cycle regulation and energy metabolism (By similarity). Has GTPase activity, binds both GDP and GTP, does not bind UTP, CTP or ATP. GTPase activity is inhibited by GDP but not by UTP, CTP, ATP, GMP or cGMP. Monomer. Belongs to the TRAFAC class TrmE-Era-EngA-EngB-Septin-like GTPase superfamily. Era GTPase family.