mitochondrial alpha-aminoadipic semialdehyde synthase is a bifunctional lysine ketoglutarate reductase /saccharopine dehydrogenase (LKR/SDH) enzyme that catalyzes the first two steps in lysine degradation
bifunctional lysine ketoglutarate reductase /saccharopine dehydrogenase enzyme; Bifunctional lysine ketoglutarate reductase /saccharopine dehydrogenase protein is a pair of enzymes linked on a single polypeptide chain that catalyze the initial, consecutive steps of lysine degradation. These proteins are related to the 2-domain saccharopine dehydrogenases. Along with formate dehydrogenase and similar enzymes, SDH consists paired domains resembling Rossmann folds in which the NAD-binding domain is inserted within the linear sequence of the catalytic domain. In this bifunctional enzyme, the LKR domain is N-terminal of the SDH domain. These proteins have a close match to the active site motif of SDHs, and an NAD-binding site motif that is a partial match to that found in SDH and other FDH-related proteins.
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Pssm-ID: 240665 [Multi-domain] Cd Length: 433 Bit Score: 776.74 E-value: 0e+00
bifunctional lysine ketoglutarate reductase /saccharopine dehydrogenase enzyme; Bifunctional lysine ketoglutarate reductase /saccharopine dehydrogenase protein is a pair of enzymes linked on a single polypeptide chain that catalyze the initial, consecutive steps of lysine degradation. These proteins are related to the 2-domain saccharopine dehydrogenases. Along with formate dehydrogenase and similar enzymes, SDH consists paired domains resembling Rossmann folds in which the NAD-binding domain is inserted within the linear sequence of the catalytic domain. In this bifunctional enzyme, the LKR domain is N-terminal of the SDH domain. These proteins have a close match to the active site motif of SDHs, and an NAD-binding site motif that is a partial match to that found in SDH and other FDH-related proteins.
Pssm-ID: 240665 [Multi-domain] Cd Length: 433 Bit Score: 776.74 E-value: 0e+00
Saccharopine dehydrogenase C-terminal domain; This family comprises the C-terminal domain of ...
601-914
1.36e-94
Saccharopine dehydrogenase C-terminal domain; This family comprises the C-terminal domain of saccharopine dehydrogenase. In some organizms this enzyme is found as a bifunctional polypeptide with lysine ketoglutarate reductase. The saccharopine dehydrogenase can also function as a saccharopine reductase.
Pssm-ID: 465219 Cd Length: 255 Bit Score: 298.44 E-value: 1.36e-94
Saccharopine dehydrogenase, NADP-dependent [Amino acid transport and metabolism]; Saccharopine ...
505-919
4.49e-59
Saccharopine dehydrogenase, NADP-dependent [Amino acid transport and metabolism]; Saccharopine dehydrogenase, NADP-dependent is part of the Pathway/BioSystem: Lysine biosynthesis
Pssm-ID: 441354 [Multi-domain] Cd Length: 352 Bit Score: 205.84 E-value: 4.49e-59
bifunctional lysine ketoglutarate reductase /saccharopine dehydrogenase enzyme; Bifunctional lysine ketoglutarate reductase /saccharopine dehydrogenase protein is a pair of enzymes linked on a single polypeptide chain that catalyze the initial, consecutive steps of lysine degradation. These proteins are related to the 2-domain saccharopine dehydrogenases. Along with formate dehydrogenase and similar enzymes, SDH consists paired domains resembling Rossmann folds in which the NAD-binding domain is inserted within the linear sequence of the catalytic domain. In this bifunctional enzyme, the LKR domain is N-terminal of the SDH domain. These proteins have a close match to the active site motif of SDHs, and an NAD-binding site motif that is a partial match to that found in SDH and other FDH-related proteins.
Pssm-ID: 240665 [Multi-domain] Cd Length: 433 Bit Score: 776.74 E-value: 0e+00
Saccharopine dehydrogenase C-terminal domain; This family comprises the C-terminal domain of ...
601-914
1.36e-94
Saccharopine dehydrogenase C-terminal domain; This family comprises the C-terminal domain of saccharopine dehydrogenase. In some organizms this enzyme is found as a bifunctional polypeptide with lysine ketoglutarate reductase. The saccharopine dehydrogenase can also function as a saccharopine reductase.
Pssm-ID: 465219 Cd Length: 255 Bit Score: 298.44 E-value: 1.36e-94
Saccharopine Dehydrogenase like proteins; Saccharopine Dehydrogenase (SDH) and related ...
25-424
2.12e-88
Saccharopine Dehydrogenase like proteins; Saccharopine Dehydrogenase (SDH) and related proteins, including bifunctional lysine ketoglutarate reductase/SDH enzymes and N(5)-(carboxyethyl)ornithine synthases. SDH catalyzes the final step in the reversible NAD-dependent oxidative deamination of saccharopine to alpha-ketoglutarate and lysine, in the alpha-aminoadipate pathway of L-lysine biosynthesis. SDH is structurally related to formate dehydrogenase and similar enzymes, having a 2-domain structure in which a Rossmann-fold NAD(P)-binding domain is inserted within the linear sequence of a catalytic domain of related structure. Bifunctional lysine ketoglutarate reductase/SDH protein is a pair of enzymes linked on a single polypeptide chain that catalyze the initial, consecutive steps of lysine degradation. These proteins are related to the 2-domain saccharopine dehydrogenases.
Pssm-ID: 240623 [Multi-domain] Cd Length: 319 Bit Score: 284.51 E-value: 2.12e-88
Saccharopine dehydrogenase, NADP-dependent [Amino acid transport and metabolism]; Saccharopine ...
505-919
4.49e-59
Saccharopine dehydrogenase, NADP-dependent [Amino acid transport and metabolism]; Saccharopine dehydrogenase, NADP-dependent is part of the Pathway/BioSystem: Lysine biosynthesis
Pssm-ID: 441354 [Multi-domain] Cd Length: 352 Bit Score: 205.84 E-value: 4.49e-59
Saccharopine Dehydrogenase NAD-binding and catalytic domains; Saccharopine Dehydrogenase (SDH) ...
30-425
1.56e-28
Saccharopine Dehydrogenase NAD-binding and catalytic domains; Saccharopine Dehydrogenase (SDH) catalyzes the final step in the reversible NAD-dependent oxidative deamination of saccharopine to alpha-ketoglutarate and lysine, in the alpha-aminoadipate pathway of L-lysine biosynthesis. SHD is structurally related to formate dehydrogenase and similar enzymes, having a 2-domain structure in which a Rossmann-fold NAD(P)-binding domain is inserted within the linear sequence of a catalytic domain of related structure.
Pssm-ID: 240664 [Multi-domain] Cd Length: 351 Bit Score: 118.10 E-value: 1.56e-28
Saccharopine dehydrogenase NADP binding domain; This family contains the NADP binding domain ...
482-597
1.10e-24
Saccharopine dehydrogenase NADP binding domain; This family contains the NADP binding domain of saccharopine dehydrogenase. In some organizms this enzyme is found as a bifunctional polypeptide with lysine ketoglutarate reductase. The saccharopine dehydrogenase can also function as a saccharopine reductase.
Pssm-ID: 397480 [Multi-domain] Cd Length: 120 Bit Score: 99.59 E-value: 1.10e-24
Alanine dehydrogenase and related dehydrogenases; Alanine dehydrogenase/Transhydrogenase, such ...
37-427
7.63e-11
Alanine dehydrogenase and related dehydrogenases; Alanine dehydrogenase/Transhydrogenase, such as the hexameric L-alanine dehydrogenase of Phormidium lapideum, contain 2 Rossmann fold-like domains linked by an alpha helical region. Related proteins include Saccharopine Dehydrogenase (SDH), bifunctional lysine ketoglutarate reductase /saccharopine dehydrogenase enzyme, N(5)-(carboxyethyl)ornithine synthase, and Rubrum transdehydrogenase. Alanine dehydrogenase (L-AlaDH) catalyzes the NAD-dependent conversion of pyrucate to L-alanine via reductive amination. Transhydrogenases found in bacterial and inner mitochondrial membranes link NAD(P)(H)-dependent redox reactions to proton translocation. The energy of the proton electrochemical gradient (delta-p), generated by the respiratory electron transport chain, is consumed by transhydrogenase in NAD(P)+ reduction. Transhydrogenase is likely involved in the regulation of the citric acid cycle. Rubrum transhydrogenase has 3 components, dI, dII, and dIII. dII spans the membrane while dI and dIII protrude on the cytoplasmic/matirx side. DI contains 2 domains with Rossmann folds, linked by a long alpha helix, and contains a NAD binding site. Two dI polypeptides (represented in this sub-family) spontaneously form a heterotrimer with one dIII in the absence of dII. In the heterotrimer, both dI chains may bind NAD, but only one is well-ordered. dIII also binds a well-ordered NADP, but in a different orientation than classical Rossmann domains.
Pssm-ID: 240621 [Multi-domain] Cd Length: 317 Bit Score: 64.35 E-value: 7.63e-11
N(5)-(carboxyethyl)ornithine synthase; N(5)-(carboxyethyl)ornithine synthase (ceo_syn) catalyzes the NADP-dependent conversion of N5-(L-1-carboxyethyl)-L-ornithine to L-ornithine + pyruvate. Ornithine plays a key role in the urea cycle, which in mammals is used in arginine biosynthesis, and is a precursor in polyamine synthesis. ceo_syn is related to the NAD-dependent L-alanine dehydrogenases. Like formate dehydrogenase and related enzymes, ceo_syn is comprised of 2 domains connected by a long alpha helical stretch, each resembling a Rossmann fold NAD-binding domain. The NAD-binding domain is inserted within the linear sequence of the more divergent catalytic domain. These ceo_syn proteins have a partially conserved NAD-binding motif and active site residues that are characteristic of related enzymes such as Saccharopine Dehydrogenase.
Pssm-ID: 240658 [Multi-domain] Cd Length: 295 Bit Score: 54.93 E-value: 8.73e-08
Rubrum transdehydrogenase NAD-binding and catalytic domains; Transhydrogenases found in ...
37-98
8.68e-05
Rubrum transdehydrogenase NAD-binding and catalytic domains; Transhydrogenases found in bacterial and inner mitochondrial membranes link NAD(P)(H)-dependent redox reactions to proton translocation. The energy of the proton electrochemical gradient (delta-p), generated by the respiratory electron transport chain, is consumed by transhydrogenase in NAD(P)+ reduction. Transhydrogenase is likely involved in the regulation of the citric acid cycle. Rubrum transhydrogenase has 3 components, dI, dII, and dIII. dII spans the membrane while dI and dIII protrude on the cytoplasmic/matrix side. DI contains 2 domains in Rossmann-like folds, linked by a long alpha helix, and contains a NAD binding site. Two dI polypeptides (represented in this sub-family) spontaneously form a heterotrimer with dIII in the absence of dII. In the heterotrimer, both dI chains may bind NAD, but only one is well-ordered. dIII also binds a well-ordered NADP, but in a different orientation than a classical Rossmann domain.
Pssm-ID: 240629 [Multi-domain] Cd Length: 363 Bit Score: 45.86 E-value: 8.68e-05
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.
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