Coenzyme B12-dependent-methylmalonyl coenzyme A (CoA) mutase (MCM) family, Alpha subunit-like subfamily; contains proteins similar to the alpha subunit of Propionbacterium shermanni MCM, as well as human and E. coli MCM. Members of this subfamily contain an N-terminal MCM domain and a C-terminal coenzyme B12 binding domain. MCM catalyzes the isomerization of methylmalonyl-CoA to succinyl-CoA. The reaction proceeds via radical intermediates beginning with a substrate-induced homolytic cleavage of the Co-C bond of coenzyme B12 to produce cob(II)alamin and the deoxyadenosyl radical. MCM plays an important role in the conversion of propionyl-CoA to succinyl-CoA during the degradation of propionate for the Krebs cycle. In higher animals, MCM is involved in the breakdown of odd-chain fatty acids, several amino acids, and cholesterol. Methylobacterium extorquens MCM participates in the glyoxylate regeneration pathway. In M. extorquens, MCM forms a complex with MeaB; MeaB may protect MCM from irreversible inactivation. In some bacteria, MCM is involved in the reverse metabolic reaction, the rearrangement of succinyl-CoA to methylmalonyl-CoA. Examples include P. shermanni MCM during propionic acid fermentation, E.coli MCM in a pathway for the conversion of succinate to propionate and Streptomyces MCM in polyketide biosynthesis. Sinorhizobium meliloti strain SU47 MCM plays a role in the polyhydroxyalkanoate degradation pathway. P. shermanni and Streptomyces cinnamonensis MCMs are alpha/beta heterodimers. It has been shown for P. shermanni MCM that only the alpha subunit binds coenzyme B12 and substrates. Human MCM is a homodimer with two active sites. Mouse and E.coli MCMs are also homodimers. In humans, impaired activity of MCM results in methylmalonic aciduria, a disorder of propionic acid metabolism.
Pssm-ID: 239651 [Multi-domain] Cd Length: 536 Bit Score: 693.72 E-value: 0e+00
methylmalonyl-CoA mutase N-terminal domain; Methylmalonyl-CoA mutase (EC 5.4.99.2) catalyzes a reversible isomerization between L-methylmalonyl-CoA and succinyl-CoA. The enzyme uses an adenosylcobalamin cofactor. It may be a homodimer, as in mitochondrion, or a heterodimer with partially homologous beta chain that does not bind the adenosylcobalamin cofactor, as in Propionibacterium freudenreichii. The most similar archaeal sequences are separate chains, such as AF2215 abd AF2219 of Archaeoglobus fulgidus, that correspond roughly to the first 500 and last 130 residues, respectively of known methylmalonyl-CoA mutases. This model describes the N-terminal domain subfamily. In a neighbor-joining tree, AF2215 branches with a bacterial isobutyryl-CoA mutase, which is also the same length. Scoring between the noise and trusted cutoffs are the non-catalytic, partially homologous beta chains from certain heterodimeric examples of 5.4.99.2.
Pssm-ID: 273190 [Multi-domain] Cd Length: 526 Bit Score: 614.09 E-value: 0e+00
Methylmalonyl-CoA mutase; The enzyme methylmalonyl-CoA mutase is a member of a class of ...
1-313
0e+00
Methylmalonyl-CoA mutase; The enzyme methylmalonyl-CoA mutase is a member of a class of enzymes that uses coenzyme B12 (adenosylcobalamin) as a cofactor. The enzyme induces the formation of an adenosyl radical from the cofactor. This radical then initiates a free-radical rearrangement of its substrate, succinyl-CoA, to methylmalonyl-CoA.
Pssm-ID: 460279 [Multi-domain] Cd Length: 503 Bit Score: 551.29 E-value: 0e+00
Coenzyme B12-dependent-methylmalonyl coenzyme A (CoA) mutase (MCM) family, Alpha subunit-like subfamily; contains proteins similar to the alpha subunit of Propionbacterium shermanni MCM, as well as human and E. coli MCM. Members of this subfamily contain an N-terminal MCM domain and a C-terminal coenzyme B12 binding domain. MCM catalyzes the isomerization of methylmalonyl-CoA to succinyl-CoA. The reaction proceeds via radical intermediates beginning with a substrate-induced homolytic cleavage of the Co-C bond of coenzyme B12 to produce cob(II)alamin and the deoxyadenosyl radical. MCM plays an important role in the conversion of propionyl-CoA to succinyl-CoA during the degradation of propionate for the Krebs cycle. In higher animals, MCM is involved in the breakdown of odd-chain fatty acids, several amino acids, and cholesterol. Methylobacterium extorquens MCM participates in the glyoxylate regeneration pathway. In M. extorquens, MCM forms a complex with MeaB; MeaB may protect MCM from irreversible inactivation. In some bacteria, MCM is involved in the reverse metabolic reaction, the rearrangement of succinyl-CoA to methylmalonyl-CoA. Examples include P. shermanni MCM during propionic acid fermentation, E.coli MCM in a pathway for the conversion of succinate to propionate and Streptomyces MCM in polyketide biosynthesis. Sinorhizobium meliloti strain SU47 MCM plays a role in the polyhydroxyalkanoate degradation pathway. P. shermanni and Streptomyces cinnamonensis MCMs are alpha/beta heterodimers. It has been shown for P. shermanni MCM that only the alpha subunit binds coenzyme B12 and substrates. Human MCM is a homodimer with two active sites. Mouse and E.coli MCMs are also homodimers. In humans, impaired activity of MCM results in methylmalonic aciduria, a disorder of propionic acid metabolism.
Pssm-ID: 239651 [Multi-domain] Cd Length: 536 Bit Score: 693.72 E-value: 0e+00
methylmalonyl-CoA mutase N-terminal domain; Methylmalonyl-CoA mutase (EC 5.4.99.2) catalyzes a reversible isomerization between L-methylmalonyl-CoA and succinyl-CoA. The enzyme uses an adenosylcobalamin cofactor. It may be a homodimer, as in mitochondrion, or a heterodimer with partially homologous beta chain that does not bind the adenosylcobalamin cofactor, as in Propionibacterium freudenreichii. The most similar archaeal sequences are separate chains, such as AF2215 abd AF2219 of Archaeoglobus fulgidus, that correspond roughly to the first 500 and last 130 residues, respectively of known methylmalonyl-CoA mutases. This model describes the N-terminal domain subfamily. In a neighbor-joining tree, AF2215 branches with a bacterial isobutyryl-CoA mutase, which is also the same length. Scoring between the noise and trusted cutoffs are the non-catalytic, partially homologous beta chains from certain heterodimeric examples of 5.4.99.2.
Pssm-ID: 273190 [Multi-domain] Cd Length: 526 Bit Score: 614.09 E-value: 0e+00
Methylmalonyl-CoA mutase; The enzyme methylmalonyl-CoA mutase is a member of a class of ...
1-313
0e+00
Methylmalonyl-CoA mutase; The enzyme methylmalonyl-CoA mutase is a member of a class of enzymes that uses coenzyme B12 (adenosylcobalamin) as a cofactor. The enzyme induces the formation of an adenosyl radical from the cofactor. This radical then initiates a free-radical rearrangement of its substrate, succinyl-CoA, to methylmalonyl-CoA.
Pssm-ID: 460279 [Multi-domain] Cd Length: 503 Bit Score: 551.29 E-value: 0e+00
Coenzyme B12-dependent-methylmalonyl coenzyme A (CoA) mutase (MCM) family, isobutyryl-CoA ...
1-322
7.54e-152
Coenzyme B12-dependent-methylmalonyl coenzyme A (CoA) mutase (MCM) family, isobutyryl-CoA mutase (ICM)-like subfamily; contains archaeal and bacterial proteins similar to the large subunit of Streptomyces cinnamonensis coenzyme B12-dependent ICM. ICM from S. cinnamonensis is comprised of a large and a small subunit. The holoenzyme appears to be an alpha2beta2 heterotetramer with up to 2 molecules of coenzyme B12 bound. The small subunit binds coenzyme B12. ICM catalyzes the reversible rearrangement of n-butyryl-CoA to isobutyryl-CoA, intermediates in fatty acid and valine catabolism, which in S. cinnamonensis can be converted to methylmalonyl-CoA and used in polyketide synthesis.
Pssm-ID: 239652 [Multi-domain] Cd Length: 538 Bit Score: 444.03 E-value: 7.54e-152
Coenzyme B12-dependent-methylmalonyl coenzyme A (CoA) mutase (MCM)-like family; contains ...
1-251
6.52e-122
Coenzyme B12-dependent-methylmalonyl coenzyme A (CoA) mutase (MCM)-like family; contains proteins similar to MCM, and the large subunit of Streptomyces coenzyme B12-dependent isobutyryl-CoA mutase (ICM). MCM catalyzes the isomerization of methylmalonyl-CoA to succinyl-CoA. The reaction proceeds via radical intermediates beginning with a substrate-induced homolytic cleavage of the Co-C bond of coenzyme B12 to produce cob(II)alamin and the deoxyadenosyl radical. MCM plays an important role in the conversion of propionyl-CoA to succinyl-CoA during the degradation of propionate for the Krebs cycle. In higher animals, MCM is involved in the breakdown of odd-chain fatty acids, several amino acids, and cholesterol. Methylobacterium extorquens MCM participates in the glyoxylate regeneration pathway. In M. extorquens, MCM forms a complex with MeaB; MeaB may protect MCM from irreversible inactivation. In some bacteria, MCM is involved in the reverse metabolic reaction, the rearrangement of succinyl-CoA to methylmalonyl-CoA. Examples include Propionbacterium shermanni MCM during propionic acid fermentation, E.coli MCM in a pathway for the conversion of succinate to propionate and Streptomyces MCM in polyketide biosynthesis. P. shermanni and Streptomyces cinnamonensis MCMs are alpha/beta heterodimers, with both subunits being homologous members of this family. It has been shown for P. shermanni MCM that only the alpha subunit binds coenzyme B12 and substrates. Human MCM is a homodimer with two active sites. Mouse and E.coli MCMs are also homodimers. ICM from S. cinnamonensis is comprised of a large and a small subunit. The holoenzyme appears to be an alpha2beta2 heterotetramer with up to 2 molecules of coenzyme B12 bound. The small subunit binds coenzyme B12. ICM catalyzes the reversible rearrangement of n-butyryl-CoA to isobutyryl-CoA (intermediates in fatty acid and valine catabolism, which in S. cinnamonensis can be converted to methylmalonyl-CoA and used in polyketide synthesis). In humans, impaired activity of MCM results in methylmalonic aciduria, a disorder of propionic acid metabolism.
Pssm-ID: 238283 [Multi-domain] Cd Length: 399 Bit Score: 362.52 E-value: 6.52e-122
Coenzyme B12-dependent-methylmalonyl coenzyme A (CoA) mutase (MCM) family, Beta subunit-like subfamily; contains bacterial proteins similar to the beta subunit of MCMs from Propionbacterium shermanni and Streptomyces cinnamonensis, which are alpha/beta heterodimers. For P. shermanni MCM, it is known that only the alpha subunit binds coenzyme B12 and substrates. The role of the beta subunit is unclear. MCM catalyzes the isomerization of methylmalonyl-CoA to succinyl-CoA. The reaction proceeds via radical intermediates beginning with a substrate-induced homolytic cleavage of the Co-C bond of coenzyme B12 to produce cob(II)alamin and the deoxyadenosyl radical. MCM plays an important role in the conversion of propionyl-CoA to succinyl-CoA during the degradation of propionate for the Krebs cycle. Methylobacterium extorquens MCM participates in the glyoxylate regeneration pathway. In M. extorquens, MCM forms a complex with MeaB; MeaB may protect MCM from irreversible inactivation. In some bacteria, MCM is involved in the reverse metabolic reaction, the rearrangement of succinyl-CoA to methylmalonyl-CoA. Examples include P. shermanni MCM during propionic acid fermentation and Streptomyces MCM in polyketide biosynthesis.
Pssm-ID: 239649 [Multi-domain] Cd Length: 424 Bit Score: 264.09 E-value: 2.41e-83
methylmalonyl-CoA mutase C-terminal domain; Methylmalonyl-CoA mutase (EC 5.4.99.2) catalyzes a reversible isomerization between L-methylmalonyl-CoA and succinyl-CoA. The enzyme uses an adenosylcobalamin cofactor. It may be a homodimer, as in mitochondrion, or a heterodimer with partially homologous beta chain that does not bind the adenosylcobalamin cofactor, as in Propionibacterium freudenreichii. The most similar archaeal sequences are separate chains, such as AF2215 and AF2219 of Archaeoglobus fulgidus, that correspond roughly to the first 500 and last 130 residues, respectively of known methylmalonyl-CoA mutases. This model describes the C-terminal domain subfamily. In a neighbor-joining tree (methylaspartate mutase S chain as the outgroup), AF2219 branches with a coenzyme B12-dependent enzyme known not to be 5.4.99.2.
Pssm-ID: 129726 [Multi-domain] Cd Length: 132 Bit Score: 243.09 E-value: 3.18e-79
methylmalonyl CoA mutase B12 binding domain. This domain binds to B12 (adenosylcobamide), ...
364-485
1.13e-64
methylmalonyl CoA mutase B12 binding domain. This domain binds to B12 (adenosylcobamide), which initiates the conversion of succinyl CoA and methylmalonyl CoA by forming an adenosyl radical, which then undergoes a rearrangement exchanging a hydrogen atom with a group attached to a neighboring carbon atom. This family is present in both mammals and bacteria. Bacterial members are heterodimers and involved in the fermentation of pyruvate to propionate. Mammalian members are homodimers and responsible for the conversion of odd-chain fatty acids and branched-chain amino acids via propionyl CoA to succinyl CoA for further degradation.
Pssm-ID: 239022 [Multi-domain] Cd Length: 122 Bit Score: 205.13 E-value: 1.13e-64
Coenzyme B12-dependent-methylmalonyl coenzyme A (CoA) mutase (MCM) family, unknown subfamily 1; composed of uncharacterized bacterial proteins containing a C-terminal MCM domain. MCM catalyzes the isomerization of methylmalonyl-CoA to succinyl-CoA. The reaction proceeds via radical intermediates beginning with a substrate-induced homolytic cleavage of the Co-C bond of coenzyme B12 to produce cob(II)alamin and the deoxyadenosyl radical. MCM plays an important role in the conversion of propionyl-CoA to succinyl-CoA during the degradation of propionate for the Krebs cycle. In some bacteria, MCM is involved in the reverse metabolic reaction, the rearrangement of succinyl-CoA to methylmalonyl-CoA. Members of this subfamily also contain an N-terminal coenzyme B12 binding domain followed by a domain similar to the E. coli ArgK membrane ATPase.
Pssm-ID: 239650 Cd Length: 495 Bit Score: 184.65 E-value: 2.51e-52
B12 binding domain (B12-BD). This domain binds different cobalamid derivates, like B12 ...
364-486
3.78e-42
B12 binding domain (B12-BD). This domain binds different cobalamid derivates, like B12 (adenosylcobamide) or methylcobalamin or methyl-Co(III) 5-hydroxybenzimidazolylcobamide, it is found in several enzymes, such as glutamate mutase, methionine synthase and methylmalonyl-CoA mutase. Cobalamin undergoes a conformational change on binding the protein; the dimethylbenzimidazole group, which is coordinated to the cobalt in the free cofactor, moves away from the corrin and is replaced by a histidine contributed by the protein. The sequence Asp-X-His-X-X-Gly, which contains this histidine ligand, is conserved in many cobalamin-binding proteins.
Pssm-ID: 239018 [Multi-domain] Cd Length: 119 Bit Score: 146.11 E-value: 3.78e-42
Coenzyme B12-dependent-methylmalonyl coenzyme A (CoA) mutase (MCM) family, MeaA-like subfamily; contains various methylmalonyl coenzyme A (CoA) mutase (MCM)-like proteins similar to the Streptomyces cinnamonensis MeaA, Methylobacterium extorquens MeaA and Streptomyces collinus B12-dependent mutase. Members of this subfamily contain an N-terminal MCM domain and a C-terminal coenzyme B12 binding domain. S. cinnamonensis MeaA is a putative B12-dependent mutase which provides methylmalonyl-CoA precursors for the biosynthesis of the monensin polyketide via an unknown pathway. S. collinus B12-dependent mutase may be involved in a pathway for acetate assimilation.
Pssm-ID: 239653 Cd Length: 407 Bit Score: 141.95 E-value: 2.30e-37
B12 binding domain (B12-BD). Most of the members bind different cobalamid derivates, like B12 ...
364-485
4.41e-27
B12 binding domain (B12-BD). Most of the members bind different cobalamid derivates, like B12 (adenosylcobamide) or methylcobalamin or methyl-Co(III) 5-hydroxybenzimidazolylcobamide. This domain is found in several enzymes, such as glutamate mutase, methionine synthase and methylmalonyl-CoA mutase. Cobalamin undergoes a conformational change on binding the protein; the dimethylbenzimidazole group, which is coordinated to the cobalt in the free cofactor, moves away from the corrin and is replaced by a histidine contributed by the protein. The sequence Asp-X-His-X-X-Gly, which contains this histidine ligand, is conserved in many cobalamin-binding proteins. Not all members of this family contain the conserved binding motif.
Pssm-ID: 239016 [Multi-domain] Cd Length: 125 Bit Score: 105.55 E-value: 4.41e-27
B12 binding domain; This domain binds to B12 (adenosylcobamide), it is found in several ...
363-481
4.11e-17
B12 binding domain; This domain binds to B12 (adenosylcobamide), it is found in several enzymes, such as glutamate mutase, methionine synthase and methylmalonyl-CoA mutase. It contains a conserved DxHxxGx(41)SxVx(26)GG motif, which is important for B12 binding.
Pssm-ID: 426713 [Multi-domain] Cd Length: 121 Bit Score: 77.37 E-value: 4.11e-17
B12 binding domain of glutamate mutase (Glm). Glutamate mutase catalysis the conversion of (S) ...
365-482
1.02e-03
B12 binding domain of glutamate mutase (Glm). Glutamate mutase catalysis the conversion of (S)-glutamate with (2S,3S)-3-methylaspartate. The rearrangement reaction is initiated by the extraction of a hydrogen from the protein-bound substrate by a 5'-desoxyadenosyl radical, which is generated by the homolytic cleavage of the organometallic bond of the cofactor B12. Glm is a heterotetrameric molecule consisting of two alpha and two epsilon polypeptide chains.
Pssm-ID: 239023 [Multi-domain] Cd Length: 128 Bit Score: 39.37 E-value: 1.02e-03
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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