PLP-dependent aminotransferase family protein may combine pyridoxal phosphate with an alpha-amino acid to form a Schiff base or aldimine intermediate, which then acts as the substrate in a reaction such as a transamination, racemization, or decarboxylation
Aspartate aminotransferase (AAT) superfamily (fold type I) of pyridoxal phosphate (PLP) ...
101-406
0e+00
Aspartate aminotransferase (AAT) superfamily (fold type I) of pyridoxal phosphate (PLP)-dependent enzymes. PLP combines with an alpha-amino acid to form a compound called a Schiff base or aldimine intermediate, which depending on the reaction, is the substrate in four kinds of reactions (1) transamination (movement of amino groups), (2) racemization (redistribution of enantiomers), (3) decarboxylation (removing COOH groups), and (4) various side-chain reactions depending on the enzyme involved. Pyridoxal phosphate (PLP) dependent enzymes were previously classified into alpha, beta and gamma classes, based on the chemical characteristics (carbon atom involved) of the reaction they catalyzed. The availability of several structures allowed a comprehensive analysis of the evolutionary classification of PLP dependent enzymes, and it was found that the functional classification did not always agree with the evolutionary history of these enzymes. Structure and sequence analysis has revealed that the PLP dependent enzymes can be classified into four major groups of different evolutionary origin: aspartate aminotransferase superfamily (fold type I), tryptophan synthase beta superfamily (fold type II), alanine racemase superfamily (fold type III), and D-amino acid superfamily (fold type IV) and Glycogen phophorylase family (fold type V).
The actual alignment was detected with superfamily member PLN03226:
Pssm-ID: 450240 Cd Length: 475 Bit Score: 529.17 E-value: 0e+00
Serine-glycine hydroxymethyltransferase (SHMT). This family belongs to pyridoxal phosphate ...
101-369
4.94e-137
Serine-glycine hydroxymethyltransferase (SHMT). This family belongs to pyridoxal phosphate (PLP)-dependent aspartate aminotransferase superfamily (fold I). SHMT carries out interconversion of serine and glycine; it catalyzes the transfer of hydroxymethyl group of N5, N10-methylene tetrahydrofolate to glycine resulting in the formation of serine and tetrahydrofolate. Both eukaryotic and prokaryotic SHMT enzymes form tight obligate homodimers; the mammalian enzyme forms a homotetramer comprising four pyridoxal phosphate-bound active sites.
Pssm-ID: 99733 Cd Length: 402 Bit Score: 397.73 E-value: 4.94e-137
Glycine/serine hydroxymethyltransferase [Amino acid transport and metabolism]; Glycine/serine ...
101-404
1.30e-134
Glycine/serine hydroxymethyltransferase [Amino acid transport and metabolism]; Glycine/serine hydroxymethyltransferase is part of the Pathway/BioSystem: Serine biosynthesis
Pssm-ID: 439882 Cd Length: 414 Bit Score: 391.70 E-value: 1.30e-134
Serine-glycine hydroxymethyltransferase (SHMT). This family belongs to pyridoxal phosphate ...
101-369
4.94e-137
Serine-glycine hydroxymethyltransferase (SHMT). This family belongs to pyridoxal phosphate (PLP)-dependent aspartate aminotransferase superfamily (fold I). SHMT carries out interconversion of serine and glycine; it catalyzes the transfer of hydroxymethyl group of N5, N10-methylene tetrahydrofolate to glycine resulting in the formation of serine and tetrahydrofolate. Both eukaryotic and prokaryotic SHMT enzymes form tight obligate homodimers; the mammalian enzyme forms a homotetramer comprising four pyridoxal phosphate-bound active sites.
Pssm-ID: 99733 Cd Length: 402 Bit Score: 397.73 E-value: 4.94e-137
Glycine/serine hydroxymethyltransferase [Amino acid transport and metabolism]; Glycine/serine ...
101-404
1.30e-134
Glycine/serine hydroxymethyltransferase [Amino acid transport and metabolism]; Glycine/serine hydroxymethyltransferase is part of the Pathway/BioSystem: Serine biosynthesis
Pssm-ID: 439882 Cd Length: 414 Bit Score: 391.70 E-value: 1.30e-134
Aspartate aminotransferase (AAT) superfamily (fold type I) of pyridoxal phosphate (PLP) ...
106-197
2.36e-12
Aspartate aminotransferase (AAT) superfamily (fold type I) of pyridoxal phosphate (PLP)-dependent enzymes. PLP combines with an alpha-amino acid to form a compound called a Schiff base or aldimine intermediate, which depending on the reaction, is the substrate in four kinds of reactions (1) transamination (movement of amino groups), (2) racemization (redistribution of enantiomers), (3) decarboxylation (removing COOH groups), and (4) various side-chain reactions depending on the enzyme involved. Pyridoxal phosphate (PLP) dependent enzymes were previously classified into alpha, beta and gamma classes, based on the chemical characteristics (carbon atom involved) of the reaction they catalyzed. The availability of several structures allowed a comprehensive analysis of the evolutionary classification of PLP dependent enzymes, and it was found that the functional classification did not always agree with the evolutionary history of these enzymes. Structure and sequence analysis has revealed that the PLP dependent enzymes can be classified into four major groups of different evolutionary origin: aspartate aminotransferase superfamily (fold type I), tryptophan synthase beta superfamily (fold type II), alanine racemase superfamily (fold type III), and D-amino acid superfamily (fold type IV) and Glycogen phophorylase family (fold type V).
Pssm-ID: 99742 [Multi-domain] Cd Length: 170 Bit Score: 64.71 E-value: 2.36e-12
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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