aldose 1-epimerase superfamily; Aldose 1-epimerases or mutarotases are key enzymes of ...
106-437
5.23e-171
aldose 1-epimerase superfamily; Aldose 1-epimerases or mutarotases are key enzymes of carbohydrate metabolism; they catalyze the interconversion of the alpha- and beta-anomers of hexose sugars such as glucose and galactose. This interconversion is an important step that allows anomer specific metabolic conversion of sugars. Studies of the catalytic mechanism of the best known member of the family, galactose mutarotase, have shown a glutamate and a histidine residue to be critical for catalysis; the glutamate serves as the active site base to initiate the reaction by removing the proton from the C-1 hydroxyl group of the sugar substrate and the histidine as the active site acid to protonate the C-5 ring oxygen.
The actual alignment was detected with superfamily member PLN00194:
Pssm-ID: 449342 [Multi-domain] Cd Length: 337 Bit Score: 482.64 E-value: 5.23e-171
galactose mutarotase_like; Galactose mutarotase catalyzes the conversion of beta-D-galactose ...
110-436
3.45e-150
galactose mutarotase_like; Galactose mutarotase catalyzes the conversion of beta-D-galactose to alpha-D-galactose. Beta-D-galactose is produced by the degradation of lactose, a disaccharide composed of beta-D-glucose and beta-D-galactose. This epimerization reaction is the first step in the four-step Leloir pathway, which converts galactose into metabolically important glucose. This epimerization step is followed by the phosophorylation of alpha-D-galactose by galactokinase, an enzyme which can only act on the alpha anomer. A glutamate and a histidine residue of the galactose mutarotase have been shown to be critical for catalysis, the glutamate serves as the active site base to initiate the reaction by removing the proton from the C-1 hydroxyl group of the sugar substrate, and the histidine as the active site acid to protonate the C-5 ring oxygen. Galactose mutarotase is a member of the aldose-1-epimerase superfamily.
Pssm-ID: 185696 Cd Length: 326 Bit Score: 429.23 E-value: 3.45e-150
galactose mutarotase; Members of this protein family act as galactose mutarotase (D-galactose ...
117-437
1.23e-93
galactose mutarotase; Members of this protein family act as galactose mutarotase (D-galactose 1-epimerase) and participate in the Leloir pathway for galactose/glucose interconversion. All members of the seed alignment for this model are found in gene clusters with other enzymes of the Leloir pathway. This enzyme family belongs to the aldose 1-epimerase family, described by pfam01263. However, the enzyme described as aldose 1-epimerase itself (EC 5.1.3.3) is called broadly specific for D-glucose, L-arabinose, D-xylose, D-galactose, maltose and lactose. The restricted genome context for genes in this family suggests members should act primarily on D-galactose.
Pssm-ID: 274240 Cd Length: 336 Bit Score: 285.80 E-value: 1.23e-93
galactose mutarotase_like; Galactose mutarotase catalyzes the conversion of beta-D-galactose ...
110-436
3.45e-150
galactose mutarotase_like; Galactose mutarotase catalyzes the conversion of beta-D-galactose to alpha-D-galactose. Beta-D-galactose is produced by the degradation of lactose, a disaccharide composed of beta-D-glucose and beta-D-galactose. This epimerization reaction is the first step in the four-step Leloir pathway, which converts galactose into metabolically important glucose. This epimerization step is followed by the phosophorylation of alpha-D-galactose by galactokinase, an enzyme which can only act on the alpha anomer. A glutamate and a histidine residue of the galactose mutarotase have been shown to be critical for catalysis, the glutamate serves as the active site base to initiate the reaction by removing the proton from the C-1 hydroxyl group of the sugar substrate, and the histidine as the active site acid to protonate the C-5 ring oxygen. Galactose mutarotase is a member of the aldose-1-epimerase superfamily.
Pssm-ID: 185696 Cd Length: 326 Bit Score: 429.23 E-value: 3.45e-150
galactose mutarotase; Members of this protein family act as galactose mutarotase (D-galactose ...
117-437
1.23e-93
galactose mutarotase; Members of this protein family act as galactose mutarotase (D-galactose 1-epimerase) and participate in the Leloir pathway for galactose/glucose interconversion. All members of the seed alignment for this model are found in gene clusters with other enzymes of the Leloir pathway. This enzyme family belongs to the aldose 1-epimerase family, described by pfam01263. However, the enzyme described as aldose 1-epimerase itself (EC 5.1.3.3) is called broadly specific for D-glucose, L-arabinose, D-xylose, D-galactose, maltose and lactose. The restricted genome context for genes in this family suggests members should act primarily on D-galactose.
Pssm-ID: 274240 Cd Length: 336 Bit Score: 285.80 E-value: 1.23e-93
aldose 1-epimerase superfamily; Aldose 1-epimerases or mutarotases are key enzymes of ...
121-424
1.65e-27
aldose 1-epimerase superfamily; Aldose 1-epimerases or mutarotases are key enzymes of carbohydrate metabolism; they catalyze the interconversion of the alpha- and beta-anomers of hexose sugars such as glucose and galactose. This interconversion is an important step that allows anomer specific metabolic conversion of sugars. Studies of the catalytic mechanism of the best known member of the family, galactose mutarotase, have shown a glutamate and a histidine residue to be critical for catalysis; the glutamate serves as the active site base to initiate the reaction by removing the proton from the C-1 hydroxyl group of the sugar substrate and the histidine as the active site acid to protonate the C-5 ring oxygen.
Pssm-ID: 185695 [Multi-domain] Cd Length: 284 Bit Score: 110.63 E-value: 1.65e-27
Aldose 1-epimerase, similar to Escherichia coli YihR; Proteins similar to Escherichia coli ...
170-384
6.91e-21
Aldose 1-epimerase, similar to Escherichia coli YihR; Proteins similar to Escherichia coli YihR are uncharacterized members of aldose-1-epimerase superfamily. Aldose 1-epimerases or mutarotases are key enzymes of carbohydrate metabolism, catalyzing the interconversion of the alpha- and beta-anomers of hexose sugars such as glucose and galactose. This interconversion is an important step that allows anomer specific metabolic conversion of sugars. Studies of the catalytic mechanism of the best known member of the family, galactose mutarotase, have shown a glutamate and a histidine residue to be critical for catalysis; the glutamate serves as the active site base to initiate the reaction by removing the proton from the C-1 hydroxyl group of the sugar substrate, and the histidine as the active site acid to protonate the C-5 ring oxygen.
Pssm-ID: 185699 Cd Length: 284 Bit Score: 92.25 E-value: 6.91e-21
aldose 1-epimerase, similar to Escherichia coli YphB; Proteins similar to Escherichia coli ...
170-435
5.38e-06
aldose 1-epimerase, similar to Escherichia coli YphB; Proteins similar to Escherichia coli YphB are uncharacterized members of the aldose-1-epimerase superfamily. Aldose 1-epimerases or mutarotases are key enzymes of carbohydrate metabolism, catalyzing the interconversion of the alpha- and beta-anomers of hexose sugars such as glucose and galactose. This interconversion is an important step that allows anomer specific metabolic conversion of sugars. Studies of the catalytic mechanism of the best known member of the family, galactose mutarotase, have shown a glutamate and a histidine residue to be critical for catalysis; the glutamate serves as the active site base to initiate the reaction by removing the proton from the C-1 hydroxyl group of the sugar substrate, and the histidine as the active site acid to protonate the C-5 ring oxygen.
Pssm-ID: 185698 Cd Length: 273 Bit Score: 47.67 E-value: 5.38e-06
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
of the residues that compose this conserved feature have been mapped to the query sequence.
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