GTPase that may function in mitochondrial ribosome assembly (Probable). Involved in a variety of growth processes during vegetative development and promotes growth and cell division in the developing integuments (PubMed:10835408, PubMed:16849600). Expressed in seedlings, roots, leaves, stems, inflorescences and siliques. 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. No visible phenotype when heterozygous, but completely female sterile when homozygous. Belongs to the TRAFAC class YlqF/YawG GTPase family. MTG1 subfamily.