Nuclear genome-encoded probable GTPase involved in ribosome biogenesis in chloroplasts. Plays a role in 16S rRNA maturation in plastids and may contribute to the assembly of the small (30S) ribosomal subunit. Very pale yellow green leaf phenotype. Virescent leaf phenotype. Belongs to the TRAFAC class TrmE-Era-EngA-EngB-Septin-like GTPase superfamily. Era GTPase family.