Small ribosomal subunit biogenesis GTPase RsgA

UniProtKB accession:  P39286

Grouped By:  Matching UniProtKB accession

UniProtKB description:  One of at least 4 proteins (Era, RbfA, RimM and RsgA/YjeQ) that assist in the late maturation steps of the functional core of the 30S ribosomal subunit (PubMed:18223068, PubMed:21102555, PubMed:21303937, PubMed:25904134, PubMed:27382067). Binds the 30S subunit contacting the head, platform, and rRNA helix 44, which may assist the last maturation stages (PubMed:21788480, PubMed:21960487). Removes RbfA from mature, but not immature 30S ribosomes in a GTP-dependent manner; 95% removal in the presence of GTP, 90% removal in GMP-PNP and 65% removal in the presence of GDP (PubMed:21102555, PubMed:25904134). Circulary permuted GTPase that catalyzes rapid hydrolysis of GTP with a slow catalytic turnover (PubMed:12220175). Dispensible for viability, but important for overall fitness. The intrinsic GTPase activity is stimulated by the presence of 30S (160-fold increase in kcat) or 70S (96-fold increase in kcat) ribosomes (PubMed:14973029). Mature 30S ribosomes stimulate intrinsic GTPase more than do immature 30S ribosomes (PubMed:25904134). Ribosome-associated GTPase activity is stimulated by RbfA (PubMed:21102555). The GTPase is inhibited by aminoglycoside antibiotics such as neomycin and paromycin (PubMed:15466596) streptomycin and spectinomycin (PubMed:15828870). This inhibition is not due to competition for binding sites on the 30S or 70S ribosome (PubMed:15828870).