precorrin-6Y C5,15-methyltransferase (decarboxylating) subunit CbiT catalyzes the methylation of C-15 in cobalt-precorrin-6B followed by the decarboxylation of C-12 to form cobalt-precorrin-7
Precorrin-6Y methyltransferase (also named CbiE); CbiE (precorrin-6Y methyltransferase, also ...
10-204
1.59e-53
Precorrin-6Y methyltransferase (also named CbiE); CbiE (precorrin-6Y methyltransferase, also known as cobalt-precorrin-7 C(5)-methyltransferase, also known as cobalt-precorrin-6Y C(5)-methyltransferase) catalyzes the methylation of C-5 in cobalt-precorrin-7 to form cobalt-precorrin-8. It participates in the pathway toward the biosynthesis of cobalamin (vitamin B12). There are two distinct cobalamin biosynthetic pathways in bacteria. The aerobic pathway requires oxygen, and cobalt is inserted late in the pathway; the anaerobic pathway does not require oxygen, and cobalt insertion is the first committed step towards cobalamin synthesis. CbiE functions in the anaerobic pathway, it is a subunit of precorrin-6Y C5,15-methyltransferase, a bifunctional enzyme: cobalt-precorrin-7 C(5)-methyltransferase (CbiE)/cobalt-precorrin-6B C(15)-methyltransferase (decarboxylating) (CbiT), that catalyzes two methylations (at C-5 and C-15) in precorrin-6Y, as well as the decarboxylation of the acetate side chain located in ring C, in order to generate precorrin-8X. CbiE and CbiT can be found fused (CbiET, also called CobL), or on separate protein chains (CbiE and CbiT). In the aerobic pathway, a single enzyme called CobL catalyzes the methylations at C-5 and C-15, and the decarboxylation of the C-12 acetate side chain of precorrin-6B.
Pssm-ID: 381171 [Multi-domain] Cd Length: 198 Bit Score: 176.15 E-value: 1.59e-53
precorrin-6y C5,15-methyltransferase (decarboxylating), CbiE subunit; This model recognizes ...
9-204
5.38e-34
precorrin-6y C5,15-methyltransferase (decarboxylating), CbiE subunit; This model recognizes the CbiE methylase which is responsible, in part (along with CbiT), for methylating precorrin-6y (or cobalt-precorrin-6y) at both the 5 and 15 positions as well as the concomitant decarbozylation at C-12. In many organisms, this protein is fused to the CbiT subunit. The fused protein, when found in organisms catalyzing the oxidative version of the cobalamin biosynthesis pathway, is called CobL.
Pssm-ID: 274146 [Multi-domain] Cd Length: 204 Bit Score: 125.51 E-value: 5.38e-34
Tetrapyrrole (Corrin/Porphyrin) Methylases; This family uses S-AdoMet in the methylation of ...
7-188
3.56e-16
Tetrapyrrole (Corrin/Porphyrin) Methylases; This family uses S-AdoMet in the methylation of diverse substrates. This family includes a related group of bacterial proteins of unknown function. This family includes the methylase Dipthine synthase.
Pssm-ID: 425769 [Multi-domain] Cd Length: 209 Bit Score: 76.61 E-value: 3.56e-16
Precorrin-6Y methyltransferase (also named CbiE); CbiE (precorrin-6Y methyltransferase, also ...
10-204
1.59e-53
Precorrin-6Y methyltransferase (also named CbiE); CbiE (precorrin-6Y methyltransferase, also known as cobalt-precorrin-7 C(5)-methyltransferase, also known as cobalt-precorrin-6Y C(5)-methyltransferase) catalyzes the methylation of C-5 in cobalt-precorrin-7 to form cobalt-precorrin-8. It participates in the pathway toward the biosynthesis of cobalamin (vitamin B12). There are two distinct cobalamin biosynthetic pathways in bacteria. The aerobic pathway requires oxygen, and cobalt is inserted late in the pathway; the anaerobic pathway does not require oxygen, and cobalt insertion is the first committed step towards cobalamin synthesis. CbiE functions in the anaerobic pathway, it is a subunit of precorrin-6Y C5,15-methyltransferase, a bifunctional enzyme: cobalt-precorrin-7 C(5)-methyltransferase (CbiE)/cobalt-precorrin-6B C(15)-methyltransferase (decarboxylating) (CbiT), that catalyzes two methylations (at C-5 and C-15) in precorrin-6Y, as well as the decarboxylation of the acetate side chain located in ring C, in order to generate precorrin-8X. CbiE and CbiT can be found fused (CbiET, also called CobL), or on separate protein chains (CbiE and CbiT). In the aerobic pathway, a single enzyme called CobL catalyzes the methylations at C-5 and C-15, and the decarboxylation of the C-12 acetate side chain of precorrin-6B.
Pssm-ID: 381171 [Multi-domain] Cd Length: 198 Bit Score: 176.15 E-value: 1.59e-53
precorrin-6y C5,15-methyltransferase (decarboxylating), CbiE subunit; This model recognizes ...
9-204
5.38e-34
precorrin-6y C5,15-methyltransferase (decarboxylating), CbiE subunit; This model recognizes the CbiE methylase which is responsible, in part (along with CbiT), for methylating precorrin-6y (or cobalt-precorrin-6y) at both the 5 and 15 positions as well as the concomitant decarbozylation at C-12. In many organisms, this protein is fused to the CbiT subunit. The fused protein, when found in organisms catalyzing the oxidative version of the cobalamin biosynthesis pathway, is called CobL.
Pssm-ID: 274146 [Multi-domain] Cd Length: 204 Bit Score: 125.51 E-value: 5.38e-34
precorrin-6Y C5,15-methyltransferase (decarboxylating), CbiT subunit; This model recognizes ...
231-351
6.66e-20
precorrin-6Y C5,15-methyltransferase (decarboxylating), CbiT subunit; This model recognizes the CbiT methylase which is responsible, in part (along with CbiE), for methylating precorrin-6y (or cobalt-precorrin-6y) at both the 5 and 15 positions as well as the concomitant decarbozylation at C-12. In many organisms, this protein is fused to the CbiE subunit. The fused protein, when found in organisms catalyzing the oxidative version of the cobalamin biosynthesis pathway, is called CobL. [Biosynthesis of cofactors, prosthetic groups, and carriers, Heme, porphyrin, and cobalamin]
Pssm-ID: 274148 [Multi-domain] Cd Length: 124 Bit Score: 84.69 E-value: 6.66e-20
Tetrapyrrole (Corrin/Porphyrin) Methylases; This family uses S-AdoMet in the methylation of ...
7-188
3.56e-16
Tetrapyrrole (Corrin/Porphyrin) Methylases; This family uses S-AdoMet in the methylation of diverse substrates. This family includes a related group of bacterial proteins of unknown function. This family includes the methylase Dipthine synthase.
Pssm-ID: 425769 [Multi-domain] Cd Length: 209 Bit Score: 76.61 E-value: 3.56e-16
Precorrin-3B C(17)-methyltransferase (also named CobJ or CbiH); Precorrin-3B C(17) ...
7-148
9.46e-06
Precorrin-3B C(17)-methyltransferase (also named CobJ or CbiH); Precorrin-3B C(17)-methyltransferase participates in the pathway toward the biosynthesis of cobalamin (vitamin B12). There are two distinct cobalamin biosynthetic pathways. The aerobic pathway requires oxygen, and cobalt is inserted late in the pathway; the anaerobic pathway does not require oxygen, and cobalt insertion is the first committed step towards cobalamin synthesis. This model includes CobJ of the aerobic pathway and CbiH of the anaerobic pathway, both as stand-alone enzymes and when CobJ or CbiH form part of bifunctional enzymes, such as in Mycobacterium tuberculosis CobIJ where CobJ fuses with a precorrin-2 C(20)-methyltransferase domain, or Bacillus megaterium CbiH60, where CbiH is fused to a nitrite and sulfite reductase-like domain. In the aerobic pathway, once CobG has generated precorrin-3b, CobJ catalyzes the methylation of precorrin-3b at C-17 to form precorrin-4 (the extruded methylated C-20 fragment is left attached as an acyl group at C-1). In the corresponding anaerobic pathway, CbiH carries out this ring contraction, using cobalt-precorrin-3b as a substrate to generate a tetramethylated delta-lactone.
Pssm-ID: 381173 [Multi-domain] Cd Length: 238 Bit Score: 46.64 E-value: 9.46e-06
S-AdoMet-dependent tetrapyrrole methylases; This superfamily uses S-AdoMet ...
58-152
4.75e-04
S-AdoMet-dependent tetrapyrrole methylases; This superfamily uses S-AdoMet (S-adenosyl-L-methionine or SAM) in the methylation of diverse substrates. Most members catalyze various methylation steps in cobalamin (vitamin B12) biosynthesis. There are two distinct cobalamin biosynthetic pathways in bacteria. The aerobic pathway requires oxygen, and cobalt is inserted late in the pathway; the anaerobic pathway does not require oxygen, and cobalt insertion is the first committed step towards cobalamin synthesis. The enzymes involved in the aerobic pathway are prefixed Cob and those of the anaerobic pathway Cbi. Most of the enzymes are shared by both pathways and a few enzymes are pathway-specific. Diphthine synthase and ribosomal RNA small subunit methyltransferase I (RsmI) are two superfamily members that are not involved in cobalamin biosynthesis. Diphthine synthase participates in the posttranslational modification of a specific histidine residue in elongation factor 2 (EF-2) of eukaryotes and archaea to diphthamide. RsmI catalyzes the 2-O-methylation of the ribose of cytidine 1402 (C1402) in 16S rRNA. Other superfamily members not involved in cobalamin biosynthesis include the N-terminal tetrapyrrole methylase domain of Bacillus subtilis YabN whose specific function is unknown, and Omphalotus olearius omphalotin methyltransferase which catalyzes the automethylation of its own C-terminus; this C terminus is subsequently released and macrocyclized to give Omphalotin A, a potent nematicide.
Pssm-ID: 381167 [Multi-domain] Cd Length: 219 Bit Score: 41.22 E-value: 4.75e-04
Precorrin-2 C20-methyltransferase, also named CobI or CbiL; Precorrin-2 C20-methyltransferase ...
59-170
1.16e-03
Precorrin-2 C20-methyltransferase, also named CobI or CbiL; Precorrin-2 C20-methyltransferase (also known as S-adenosyl-L-methionine--precorrin-2 methyltransferase) participates in the pathway toward the biosynthesis of cobalamin (vitamin B12). There are two distinct cobalamin biosynthetic pathways in bacteria. The aerobic pathway requires oxygen, and cobalt is inserted late in the pathway; the anaerobic pathway does not require oxygen, and cobalt insertion is the first committed step towards cobalamin synthesis. Precorrin-2 C20-methyltransferase catalyzes methylation at the C-20 position of a cyclic tetrapyrrole ring of precorrin-2 using S-adenosylmethionine as a methyl group source to produce precorrin-3A. In the anaerobic pathway, cobalt is inserted into precorrin-2 by CbiK to generate cobalt-precorrin-2, which is the substrate for CbiL, a C20 methyltransferase. In Clostridium difficile, CbiK and CbiL are fused into a bifunctional enzyme. In the aerobic pathway, the precorrin-2 C20-methyltransferase is named CobI. This family includes CbiL and CobI precorrin-2 C20-methyltransferases, both as stand-alone enzymes and when CbiL forms part of a bifunctional enzyme.
Pssm-ID: 381172 [Multi-domain] Cd Length: 223 Bit Score: 40.18 E-value: 1.16e-03
uncharacterized family of the tetrapyrrole methylase superfamily; Members of this superfamily ...
58-116
9.65e-03
uncharacterized family of the tetrapyrrole methylase superfamily; Members of this superfamily use S-AdoMet (S-adenosyl-L-methionine or SAM) in the methylation of diverse substrates. Most members catalyze various methylation steps in cobalamin (vitamin B12) biosynthesis. There are two distinct cobalamin biosynthetic pathways in bacteria. The aerobic pathway requires oxygen, and cobalt is inserted late in the pathway; the anaerobic pathway does not require oxygen, and cobalt insertion is the first committed step towards cobalamin synthesis. The enzymes involved in the aerobic pathway are prefixed Cob and those of the anaerobic pathway Cbi. Most of the enzymes are shared by both pathways and a few enzymes are pathway-specific. Diphthine synthase and Ribosomal RNA small subunit methyltransferase I (RsmI) are two superfamily members that are not involved in cobalamin biosynthesis. Diphthine synthase participates in the posttranslational modification of a specific histidine residue in elongation factor 2 (EF-2) of eukaryotes and archaea to diphthamide. RsmI catalyzes the 2-O-methylation of the ribose of cytidine 1402 (C1402) in 16S rRNA. Other superfamily members not involved in cobalamin biosynthesis include the N-terminal tetrapyrrole methylase domain of Bacillus subtilis YabN whose specific function is unknown, and Omphalotus olearius omphalotin methyltransferase which catalyzes the automethylation of its own C-terminus; this C terminus is subsequently released and macrocyclized to give Omphalotin A, a potent nematicide.
Pssm-ID: 381178 [Multi-domain] Cd Length: 243 Bit Score: 37.53 E-value: 9.65e-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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