GTPase involved in pre-60S ribosomal subunit maturation. The GTPase activity is stimulated in the presence of ribosomes, particularly of the 60S subunit. kcat is 0.12 min(-1) for GTP. Interacts (via N-terminus) with the 60S ribosomal proteins RPL10A. This interaction is enhanced by the addition of GTP. The N-terminal region (1-231) is necessary for targeting to the nucleus. Expressed in roots, shoot apical meristem, leaves, leaf sheaths and flowers. Belongs to the TRAFAC class YlqF/YawG GTPase family. RsgA subfamily.