Protein Family Models

Date:

2024-08-14

This family is structurally different from the alpha/beta hydrolase family (Pfam:PF00561). This family includes L-2-haloacid dehalogenase, epoxide hydrolases and phosphatases. The structure of the family consists of two domains. One is an inserted four helix bundle, which is the least well conserved region of the alignment, between residues 16 and 96 of Swiss:P24069. The rest of the fold is composed of the core alpha/beta domain [1]. Those members with the characteristic DxD triad at the N-terminus are probably phosphatidylglycerolphosphate (PGP) phosphatases involved in cardiolipin biosynthesis in the mitochondria [2]. [1]. 8702766. Crystal structure of L-2-haloacid dehalogenase from Pseudomonas. sp. YL. An alpha/beta hydrolase structure that is different from. the alpha/beta hydrolase fold.. Hisano T, Hata Y, Fujii T, Liu JQ, Kurihara T, Esaki N, Soda K;. J Biol Chem 1996;271:20322-20330.. [2]. 20485265. A mitochondrial phosphatase required for cardiolipin. biosynthesis: the PGP phosphatase Gep4.. Osman C, Haag M, Wieland FT, Brugger B, Langer T;. EMBO J. 2010;29:1976-1987 (from Pfam)

Date:

2024-08-14

This subfamily HMM groups together three clades: the characterized beta-phosphoglucomutases (including those from E.coli, B.subtilus and L.lactis, TIGR01990), a clade of putative bPGM's from mycobacteria and a clade including the uncharacterized E.coli and H.influenzae yqaB genes which may prove to be beta-mutases of a related 1-phosphosugar. All of these are members of the larger Haloacid dehalogenase (HAD) subfamily IA and include the "variant 3" glu-asp version of the third conserved HAD domain (TIGR01509).

Date:

2021-10-26

This model represents the beta-phosphoglucomutase enzyme which catalyzes the interconverison of beta-D-glucose-1-phosphate and beta-D-glucose-6-phosphate. The 6-phosphate is capable of non-enzymatic anomerization (alpha <-> beta) while the 1-phosphate is not. A separate enzyme is responsible for the isomerization of the alpha anomers. Beta-D-glucose-1-phosphate results from the phosphorylysis of maltose (2.4.1.8), trehalose (2.4.1.64) or trehalose-6-phosphate (2.4.1.216). Alternatively, these reactions can be run in the synthetic direction to create the disaccharides. All sequenced genomes which contain a member of this family also appear to contain at least one putative maltose or trehalose phosphorylase. Three species, Lactococcus, Enterococcus and Neisseria appear to contain a pair of paralogous beta-PGM's. Beta-phosphoglucomutase is a member of the haloacid dehalogenase superfamily of hydrolase enzymes. These enzymes are characterized by a series of three catalytic motifs positioned within an alpha-beta (Rossman) fold [1]. beta-PGM contains an inserted alpha helical domain in between the first and second conserved motifs and thus is a member of subfamily IA of the superfamily [2,3]. The third catalytic motif comes in three variants, the third of which, containing a conserved DD or ED, is the only one found here as well as in several other related enzymes (TIGR01509). The enzyme from L. lactis has been extensively characterized including a remarkable crystal structure which traps the pentacoordinate transition state [4].

Gene:

pgmB

Date:

2024-05-15

This HMM represents part of one structural subfamily of the Haloacid Dehalogenase (HAD) superfamily of aspartate-nucleophile hydrolases. The superfamily is defined by the presence of three short catalytic motifs (PMID:7966317). HAD subfamilies are defined (PMID:11601995) based on the location and the observed or predicted fold of a so-called "capping domain" (PMID:10956028), or the absence of such a domain. Subfamily I consists of sequences in which the capping domain is found in between the first and second catalytic motifs. The Subfamily IA and IB capping domains are predicted by PSI-PRED to consist of an alpha helical bundle. This model represents variant 3 of subfamily IA, in which the HAD superfamily's third catalytic motif takes the form hhhhDDxxx(x)s, where _s_ refers to a small amino acid and _h_ to a hydrophobic one.

Date:

2021-04-27