Bacterial L-asparaginases and related enzymes; Asparaginases (amidohydrolases, E.C. 3.5.1.1) ...
1-348
0e+00
Bacterial L-asparaginases and related enzymes; Asparaginases (amidohydrolases, E.C. 3.5.1.1) are dimeric or tetrameric enzymes that catalyze the hydrolysis of asparagine to aspartic acid and ammonia. In bacteria, there are two classes of amidohydrolases, one highly specific for asparagine and localized to the periplasm (type II L-asparaginase), and a second (asparaginase- glutaminase) present in the cytosol (type I L-asparaginase) that hydrolyzes both asparagine and glutamine with similar specificities and has a lower affinity for its substrate. Bacterial L-asparaginases (type II) are potent antileukemic agents and have been used in the treatment of acute lymphoblastic leukemia (ALL). A conserved threonine residue is thought to supply the nucleophile hydroxy-group that attacks the amide bond. Many bacterial L-asparaginases have both L-asparagine and L-glutamine hydrolysis activities, to a different degree, and some of them are annotated as asparaginase/glutaminase. This wider family also includes a subunit of an archaeal Glu-tRNA amidotransferase.
The actual alignment was detected with superfamily member TIGR00520:
Pssm-ID: 469665 [Multi-domain] Cd Length: 349 Bit Score: 527.41 E-value: 0e+00
L-asparaginase, type II; Two related families of asparaginase (L-asparagine amidohydrolase, EC ...
1-348
0e+00
L-asparaginase, type II; Two related families of asparaginase (L-asparagine amidohydrolase, EC 3.5.1.1) are designated type I and type II according to the terminology in E. coli, which has both: L-asparaginase I is a low-affinity enzyme found in the cytoplasm, while L-asparaginase II is a high-affinity periplasmic enzyme synthesized with a cleavable signal sequence. This model describes L-asparaginases related to type II of E. coli. Both the cytoplasmic and the cell wall asparaginases of Saccharomyces cerevisiae belong to this set. Members of this set from Acinetobacter glutaminasificans and Pseudomonas fluorescens are described as having both glutaminase and asparaginase activitities. All members are homotetrameric. [Energy metabolism, Amino acids and amines]
Pssm-ID: 273115 [Multi-domain] Cd Length: 349 Bit Score: 527.41 E-value: 0e+00
Type II (periplasmic) bacterial L-asparaginase; Asparaginases (amidohydrolases, E.C. 3.5.1.1) ...
24-342
6.08e-152
Type II (periplasmic) bacterial L-asparaginase; Asparaginases (amidohydrolases, E.C. 3.5.1.1) are enzymes that catalyze the hydrolysis of asparagine to aspartic acid and ammonia. In bacteria, there are two classes of amidohydrolases. This model represents type II L-asparaginases, which tend to be highly specific for asparagine and localized to the periplasm. They are potent antileukemic agents and have been used in the treatment of acute lymphoblastic leukemia (ALL), but not without severe side effects. Tumor cells appear to have a heightened dependence on exogenous L-aspartate, and depleting their surroundings of L-aspartate may starve cancerous ALL cells. Type II L-asparaginase acts as a tetramer, which is actually a dimer of two tightly bound dimers. A conserved threonine residue is thought to supply the nucleophile hydroxy-group that attacks the amide bond. Many bacterial L-asparaginases have both L-asparagine and L-glutamine hydrolysis activities, to a different degree, and some of them are annotated as asparaginase/glutaminase.
Pssm-ID: 199208 [Multi-domain] Cd Length: 319 Bit Score: 430.01 E-value: 6.08e-152
Asparaginase, found in various plant, animal and bacterial cells; Asparaginase catalyses the ...
26-342
1.08e-137
Asparaginase, found in various plant, animal and bacterial cells; Asparaginase catalyses the deamination of asparagine to yield aspartic acid and an ammonium ion, resulting in a depletion of free circulatory asparagine in plasma. The enzyme is effective in the treatment of human malignant lymphomas, which have a diminished capacity to produce asparagine synthetase: in order to survive, such cells absorb asparagine from blood plasma..- if Asn levels have been depleted by injection of asparaginase, the lymphoma cells die.
Pssm-ID: 214873 [Multi-domain] Cd Length: 323 Bit Score: 393.81 E-value: 1.08e-137
L-asparaginase, type II; Two related families of asparaginase (L-asparagine amidohydrolase, EC ...
1-348
0e+00
L-asparaginase, type II; Two related families of asparaginase (L-asparagine amidohydrolase, EC 3.5.1.1) are designated type I and type II according to the terminology in E. coli, which has both: L-asparaginase I is a low-affinity enzyme found in the cytoplasm, while L-asparaginase II is a high-affinity periplasmic enzyme synthesized with a cleavable signal sequence. This model describes L-asparaginases related to type II of E. coli. Both the cytoplasmic and the cell wall asparaginases of Saccharomyces cerevisiae belong to this set. Members of this set from Acinetobacter glutaminasificans and Pseudomonas fluorescens are described as having both glutaminase and asparaginase activitities. All members are homotetrameric. [Energy metabolism, Amino acids and amines]
Pssm-ID: 273115 [Multi-domain] Cd Length: 349 Bit Score: 527.41 E-value: 0e+00
Type II (periplasmic) bacterial L-asparaginase; Asparaginases (amidohydrolases, E.C. 3.5.1.1) ...
24-342
6.08e-152
Type II (periplasmic) bacterial L-asparaginase; Asparaginases (amidohydrolases, E.C. 3.5.1.1) are enzymes that catalyze the hydrolysis of asparagine to aspartic acid and ammonia. In bacteria, there are two classes of amidohydrolases. This model represents type II L-asparaginases, which tend to be highly specific for asparagine and localized to the periplasm. They are potent antileukemic agents and have been used in the treatment of acute lymphoblastic leukemia (ALL), but not without severe side effects. Tumor cells appear to have a heightened dependence on exogenous L-aspartate, and depleting their surroundings of L-aspartate may starve cancerous ALL cells. Type II L-asparaginase acts as a tetramer, which is actually a dimer of two tightly bound dimers. A conserved threonine residue is thought to supply the nucleophile hydroxy-group that attacks the amide bond. Many bacterial L-asparaginases have both L-asparagine and L-glutamine hydrolysis activities, to a different degree, and some of them are annotated as asparaginase/glutaminase.
Pssm-ID: 199208 [Multi-domain] Cd Length: 319 Bit Score: 430.01 E-value: 6.08e-152
Asparaginase, found in various plant, animal and bacterial cells; Asparaginase catalyses the ...
26-342
1.08e-137
Asparaginase, found in various plant, animal and bacterial cells; Asparaginase catalyses the deamination of asparagine to yield aspartic acid and an ammonium ion, resulting in a depletion of free circulatory asparagine in plasma. The enzyme is effective in the treatment of human malignant lymphomas, which have a diminished capacity to produce asparagine synthetase: in order to survive, such cells absorb asparagine from blood plasma..- if Asn levels have been depleted by injection of asparaginase, the lymphoma cells die.
Pssm-ID: 214873 [Multi-domain] Cd Length: 323 Bit Score: 393.81 E-value: 1.08e-137
Bacterial L-asparaginases and related enzymes; Asparaginases (amidohydrolases, E.C. 3.5.1.1) ...
24-342
6.30e-114
Bacterial L-asparaginases and related enzymes; Asparaginases (amidohydrolases, E.C. 3.5.1.1) are dimeric or tetrameric enzymes that catalyze the hydrolysis of asparagine to aspartic acid and ammonia. In bacteria, there are two classes of amidohydrolases, one highly specific for asparagine and localized to the periplasm (type II L-asparaginase), and a second (asparaginase- glutaminase) present in the cytosol (type I L-asparaginase) that hydrolyzes both asparagine and glutamine with similar specificities and has a lower affinity for its substrate. Bacterial L-asparaginases (type II) are potent antileukemic agents and have been used in the treatment of acute lymphoblastic leukemia (ALL). A conserved threonine residue is thought to supply the nucleophile hydroxy-group that attacks the amide bond. Many bacterial L-asparaginases have both L-asparagine and L-glutamine hydrolysis activities, to a different degree, and some of them are annotated as asparaginase/glutaminase. This wider family also includes a subunit of an archaeal Glu-tRNA amidotransferase.
Pssm-ID: 199205 [Multi-domain] Cd Length: 320 Bit Score: 333.33 E-value: 6.30e-114
L-asparaginase, type I; Two related families of asparaginase are designated type I and type II ...
23-347
1.33e-55
L-asparaginase, type I; Two related families of asparaginase are designated type I and type II according to the terminology in E. coli, which has both: L-asparaginase I is a low-affinity enzyme found in the cytoplasm, while L-asparaginase II is a high-affinity secreted enzyme synthesized with a cleavable signal sequence. This model describes L-asparaginases related to type I of E. coli. Archaeal putative asparaginases are of this type but contain an extra ~ 80 residues in a conserved N-terminal region. These archaeal homologs are included in this model.
Pssm-ID: 129610 [Multi-domain] Cd Length: 336 Bit Score: 184.64 E-value: 1.33e-55
GatD subunit of archaeal Glu-tRNA amidotransferase; GatD is involved in the alternative ...
23-347
2.83e-53
GatD subunit of archaeal Glu-tRNA amidotransferase; GatD is involved in the alternative synthesis of Gln-tRNA(Gln) in archaea via the transamidation of incorrectly charged Glu-tRNA(Gln). GatD is active as a dimer, and it provides the amino group required for this reaction. GatD is related to bacterial L-asparaginases (amidohydrolases), which catalyze the hydrolysis of asparagine to aspartic acid and ammonia. This CD spans both the L-asparaginase_like domain and an N-terminal supplementary domain.
Pssm-ID: 199206 [Multi-domain] Cd Length: 402 Bit Score: 180.51 E-value: 2.83e-53
Type I (cytosolic) bacterial L-asparaginase; Asparaginases (amidohydrolases, E.C. 3.5.1.1) are ...
26-343
1.88e-42
Type I (cytosolic) bacterial L-asparaginase; Asparaginases (amidohydrolases, E.C. 3.5.1.1) are enzymes that catalyze the hydrolysis of asparagine to aspartic acid and ammonia. In bacteria, there are two classes of amidohydrolases. This model represents type I L-asparaginases, which are highly specific for asparagine and localized in the cytosol. Type I L-asparaginase acts as a dimer. A conserved threonine residue is thought to supply the nucleophile hydroxy-group that attacks the amide bond. Many bacterial L-asparaginases have both L-asparagine and L-glutamine hydrolysis activities, to a different degree, and some of them are annotated as asparaginase/glutaminase. One example of an enzyme with no L-glutaminase activity is the type I L-asparaginase from Wolinella succinogenes.
Pssm-ID: 199207 [Multi-domain] Cd Length: 316 Bit Score: 149.65 E-value: 1.88e-42
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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