GTPase involved in pre-60S ribosomal subunit maturation. The GTPase activity is stimulated in the presence of the 60S ribosomal subunit. kcat is 0.087 min(-1) for GTP. Interacts with the 60S ribosomal proteins RPL10AA, RPL10AB and RPL10AC. Ubiquitous, with higher levels in meristematic regions. In contrast to other GTP-binding proteins, this family is characterized by a circular permutation of the GTPase motifs described by a G4-G1-G3 pattern. The DARXP motif is also sometime designated as G6 region. Belongs to the TRAFAC class YlqF/YawG GTPase family. RsgA subfamily.