Involved in the de novo synthesis of guanine nucleotides which are not only essential for DNA and RNA synthesis, but also provide GTP, which is involved in a number of cellular processes important for cell division. Homo sapiens (taxid: 9606) EC: 6EC: .EC: 3EC: .EC: 5EC: .EC: 2
Involved in the de novo synthesis of guanine nucleotides which are not only essential for DNA and RNA synthesis, but also provide GTP, which is involved in a number of cellular processes important for cell division.
>PF00958 GMP_synt_C: GMP synthase C terminal domain domain; InterPro: IPR001674 The amidotransferase family of enzymes utilises the ammonia derived from the hydrolysis of glutamine for a subsequent chemical reaction catalyzed by the same enzyme
The ammonia intermediate does not dissociate into solution during the chemical transformations []. GMP synthetase is a glutamine amidotransferase from the de novo purine biosynthetic pathway. The C-terminal domain is specific to the GMP synthases 6.3.5.2 from EC. In prokaryotes this domain mediates dimerisation. Eukaryotic GMP synthases are monomers. This domain in eukaryotes includes several large insertions that may form globular domains [].; GO: 0003922 GMP synthase (glutamine-hydrolyzing) activity, 0005524 ATP binding, 0006164 purine nucleotide biosynthetic process, 0006177 GMP biosynthetic process; PDB: 2VXO_A 2YWC_D 2YWB_D 2DPL_B 3A4I_A 3UOW_B 3TQI_D 1GPM_C.
It contains two subdomains; the ATP pyrophosphatase domain which closes to the N-termial and the dimerization domain at C-terminal end. The ATP-PPase is a twisted, five-stranded parallel beta-sheet sandwiched between helical layers. It has a signature nucleotide-binding motif, or P-loop, at the end of the first-beta strand.The dimerization domain formed by the C-terminal 115 amino acid for prokaryotic proteins. It is adjacent to teh ATP-binding site of the ATP-PPase subdomain. The largest difference between the primary sequence of prokaryotic and eukaryotic GMP synthetase map to the dimerization domain.Eukaryotic GMP synthetase has several large insertions relative to prokaryotes.
>TIGR00884 guaA_Cterm GMP synthase (glutamine-hydrolyzing), C-terminal domain or B subunit
This protein of purine de novo biosynthesis is well-conserved. However, it appears to split into two separate polypeptide chains in most of the Archaea. This C-terminal region would be the larger subunit