Protein Family Models

This domain is found in HypB, a hydrogenase expression / formation protein, and UreG a urease accessory protein. Both these proteins contain a P-loop nucleotide binding motif [2,3]. HypB has GTPase activity and is a guanine nucleotide binding protein [3]. It is not known whether UreG binds GTP or some other nucleotide. Both enzymes are involved in nickel binding. HypB can store nickel and is required for nickel dependent hydrogenase expression [1]. UreG is required for functional incorporation of the urease nickel metallocenter.[4] GTP hydrolysis may required by these proteins for nickel incorporation into other nickel proteins [1]. This family of domains also contains P47K (Swiss:P31521), a Pseudomonas chlororaphis protein needed for nitrile hydratase expression, and the cobW gene product (Swiss:P29937), which may be involved in cobalamin biosynthesis in Pseudomonas denitrificans [5]. [1]. 9140970. The HypB protein from Bradyrhizobium japonicum can store nickel and is required for the nickel-dependent transcriptional regulation of hydrogenase. Olson JW, Fu C, Maier RJ;. Mol Microbiol 1997;24:119-128. [2]. 9209019. Characterization of UreG, identification of a UreD-UreF-UreG complex, and evidence suggesting that a nucleotide-binding site in UreG is required for in vivo metallocenter assembly of Klebsiella aerogenes urease. Moncrief MB, Hausinger RP;. J Bacteriol 1997;179:4081-4086. [3]. 8423137. The product of the hypB gene, which is required for nickel incorporation into hydrogenases, is a novel guanine nucleotide-binding protein. Maier T, Jacobi A, Sauter M, Bock A;. J Bacteriol 1993;175:630-635. [4]. 1624427. Klebsi. TRUNCATED at 1650 bytes (from Pfam)

Date:

2024-10-16

urease accessory protein UreG facilitates the functional incorporation of the urease nickel metallocenter

Date:

2024-11-28

This HMM represents UreG, a GTP hydrolase that acts in the assembly of the nickel metallocenter of urease. It is found only in urease-positive species, although some urease-positive species (e.g. Bacillus subtilis) lack this protein. A similar protein, hypB, is an accessory protein for expression of hydrogenase, which also uses nickel.

Gene:

ureG

Date:

2024-05-30