Enzymes
| UniProtKB help_outline | 4 proteins |
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- Name help_outline precorrin-3B Identifier CHEBI:77870 Charge -6 Formula C43H44N4O17 InChIKeyhelp_outline KJHZYYJBHKAUHS-NXWQJPGNSA-H SMILEShelp_outline C[C@]1(CC([O-])=O)[C@H](CCC([O-])=O)\C2=C\c3[nH]c(Cc4[nH]c(c(CC([O-])=O)c4CCC([O-])=O)[C@](C)(O)[C@@]45N\C(=C/C1=[NH+]2)[C@@H](CCC([O-])=O)[C@]4(C)CC(=O)O5)c(CCC([O-])=O)c3CC([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline S-adenosyl-L-methionine Identifier CHEBI:59789 Charge 1 Formula C15H23N6O5S InChIKeyhelp_outline MEFKEPWMEQBLKI-AIRLBKTGSA-O SMILEShelp_outline C[S+](CC[C@H]([NH3+])C([O-])=O)C[C@H]1O[C@H]([C@H](O)[C@@H]1O)n1cnc2c(N)ncnc12 2D coordinates Mol file for the small molecule Search links Involved in 842 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,176 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline precorrin-4 Identifier CHEBI:57769 Charge -8 Formula C44H44N4O17 InChIKeyhelp_outline IOBDBIPWYQGVMM-VLMJWMIZSA-F SMILEShelp_outline CC(=O)C12N\C(=C/C3=NC(Cc4[nH]c(CC5=NC1=C(CC([O-])=O)[C@@]5(C)CCC([O-])=O)c(CCC([O-])=O)c4CC([O-])=O)=C(CCC([O-])=O)[C@]3(C)CC([O-])=O)[C@@H](CCC([O-])=O)[C@]2(C)CC([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline S-adenosyl-L-homocysteine Identifier CHEBI:57856 Charge 0 Formula C14H20N6O5S InChIKeyhelp_outline ZJUKTBDSGOFHSH-WFMPWKQPSA-N SMILEShelp_outline Nc1ncnc2n(cnc12)[C@@H]1O[C@H](CSCC[C@H]([NH3+])C([O-])=O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 768 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:12761 | RHEA:12762 | RHEA:12763 | RHEA:12764 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Biosynthesis of the corrin macrocycle of coenzyme B12 in Pseudomonas denitrificans.
Debussche L., Thibaut D., Cameron B., Crouzet J., Blanche F.J.
Studies with cell-free protein preparations from a series of recombinant strains of Pseudomonas denitrificans demonstrated that precorrin-3 is converted into a further trimethylated intermediate, named precorrin-3B, along the pathway to coenzyme B12. It was then shown that the part of the pathway ... >> More
Studies with cell-free protein preparations from a series of recombinant strains of Pseudomonas denitrificans demonstrated that precorrin-3 is converted into a further trimethylated intermediate, named precorrin-3B, along the pathway to coenzyme B12. It was then shown that the part of the pathway from precorrin-3 (called precorrin-3A hereafter) to precorrin-6x involves three intermediates, precorrin-3B, precorrin-4, and precorrin-5. Precorrin-3B was isolated in its native (reduced) as well as its oxidized (factor-IIIB) states, and precorrin-4 was isolated in its oxidized form only (factor-IV). Both factors were in vitro precursors of precorrin-6x. The synthesis of precorrin-6x from precorrin-3A was shown to be catalyzed by four enzymes, CobG, CobJ, CobM, and CobF, intervening in this order. They were purified to homogeneity. CobG, which converts precorrin-3A to precorrin-3B, was found to be an iron-sulfur protein responsible for the oxidation known to occur between precorrin-3A and precorrin-6x, and CobJ, CobM, and CobF are the C-17, C-11, and C-1 methylases, respectively. The acetate fragment is extruded after precorrin-4 formation. This study combined with our recent structural studies on factor-IV (D. Thibaut, L. Debussche, D. Fréchet, F. Herman, M. Vuilhorgne, and F. Blanche, J. Chem. Soc. Chem. Commun. 1993:513-515, 1993) and precorrin-3B (L. Debussche, D. Thibaut, M. Danzer, F. Debu, D. Fréchet, F. Herman, F. Blanche, and M. Vuilhorgne, J. Chem. Soc. Chem. Commun. 1993:1100-1103, 1993) provides a first step-by-step picture of the sequence of the enzymatic reactions leading to the corrin ring in P. denitrificans. << Less
J. Bacteriol. 175:7430-7440(1993) [PubMed] [EuropePMC]
This publication is cited by 3 other entries.
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Biosynthesis of vitamin B12. Discovery of the enzymes for oxidative ring contraction and insertion of the fourth methyl group.
Scott A.I., Roessner C.A., Stolowich N.J., Spencer J.B., Min C., Ozaki S.I.
In the vitamin B12 biosynthetic pathway the enzymes responsible for the conversion of precorrin-3 to precorrin-4 have been identified as the gene products of cobG and cobJ from Pseudomonas denitrificans. CobG catalyzes the oxidation of precorrin-3 to precorrin-3x (a hydroxy lactone) whereas CobJ i ... >> More
In the vitamin B12 biosynthetic pathway the enzymes responsible for the conversion of precorrin-3 to precorrin-4 have been identified as the gene products of cobG and cobJ from Pseudomonas denitrificans. CobG catalyzes the oxidation of precorrin-3 to precorrin-3x (a hydroxy lactone) whereas CobJ is a SAM-dependent C-17 methyl transferase and is necessary for ring contraction. A mechanism for ring contraction is proposed. << Less
FEBS Lett 331:105-108(1993) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.