InterPro domain: IPR014100
General Information
- Identifier IPR014100
- Description GTP-binding protein Obg/CgtA
- Number of genes 185
- Gene duplication stats Loading...
- Associated GO terms GO:0000287 GO:0005525 GO:0003924
Abstract
This entry describes a universal, mostly one-gene-per-genome GTP-binding protein that associates with ribosomal subunits and appears to play a role in ribosomal RNA maturation. Mutations in this gene are pleiotropic, but it appears that effects on cellular functions such as chromosome partition may be secondary to the effect on ribosome structure.
This is an essential GTPase which binds GTP, GDP and ppGpp with moderate affinity (with a twofold preference for GDP over GTP); shows high guanine nucleotide exchange rate constants for both nucleotides, and has a relatively low GTP hydrolysis rate. Deletion of the N terminus makes a protein that is non-functional in vivo but which retains nucleotide binding and GTPase activity. Required for cell cycle progression from G1 to S phase and for DNA replication [ 1 ].
1. The Caulobacter crescentus GTPase CgtAC is required for progression through the cell cycle and for maintaining 50S ribosomal subunit levels. Mol. Microbiol. 54, 1379-92