Reaction participants Show >> << Hide
- Name help_outline AH2 Identifier CHEBI:17499 Charge 0 Formula RH2 SMILEShelp_outline *([H])[H] 2D coordinates Mol file for the small molecule Search links Involved in 2,799 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline Co(II)-factor III Identifier CHEBI:73299 Charge -8 Formula C43H38CoN4O16 InChIKeyhelp_outline RQHZZQLPDALGEQ-CYGMIEPJSA-D SMILEShelp_outline CC1=C2[N+]3=C(C=C4N5C(=CC6=[N+]7C(=Cc8c(CCC([O-])=O)c(CC([O-])=O)c1n8[Co--]357)C(CCC([O-])=O)=C6CC([O-])=O)[C@@H](CCC([O-])=O)[C@]4(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-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 868 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline A Identifier CHEBI:13193 Charge Formula R SMILEShelp_outline * 2D coordinates Mol file for the small molecule Search links Involved in 2,870 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline Co-precorrin-4 Identifier CHEBI:60061 Charge -7 Formula C44H43CoN4O16 InChIKeyhelp_outline VHHGJROBFDFFAE-QTESGACZSA-F SMILEShelp_outline CC1OC(=O)C[C@@]2(C)[C@H](CCC([O-])=O)C3=CC4=[N+]5C(=Cc6c(CC([O-])=O)c(CCC([O-])=O)c7CC8=[N+]9C(=C(CC([O-])=O)[C@@]8(C)CCC([O-])=O)C12N3[Co--]59n67)[C@@H](CCC([O-])=O)[C@]4(C)CC([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 3 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 792 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:36155 | RHEA:36156 | RHEA:36157 | RHEA:36158 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Characterization of the enzyme CbiH60 involved in anaerobic ring contraction of the cobalamin (vitamin B12) biosynthetic pathway.
Moore S.J., Biedendieck R., Lawrence A.D., Deery E., Howard M.J., Rigby S.E., Warren M.J.
The anaerobic pathway for the biosynthesis of cobalamin (vitamin B(12)) has remained poorly characterized because of the sensitivity of the pathway intermediates to oxygen and the low activity of enzymes. One of the major bottlenecks in the anaerobic pathway is the ring contraction step, which has ... >> More
The anaerobic pathway for the biosynthesis of cobalamin (vitamin B(12)) has remained poorly characterized because of the sensitivity of the pathway intermediates to oxygen and the low activity of enzymes. One of the major bottlenecks in the anaerobic pathway is the ring contraction step, which has not been observed previously with a purified enzyme system. The Gram-positive aerobic bacterium Bacillus megaterium has a complete anaerobic pathway that contains an unusual ring contraction enzyme, CbiH(60), that harbors a C-terminal extension with sequence similarity to the nitrite/sulfite reductase family. To improve solubility, the enzyme was homologously produced in the host B. megaterium DSM319. CbiH(60) was characterized by electron paramagnetic resonance and shown to contain a [4Fe-4S] center. Assays with purified recombinant CbiH(60) demonstrate that the enzyme converts both cobalt-precorrin-3 and cobalt factor III into the ring-contracted product cobalt-precorrin-4 in high yields, with the latter transformation dependent upon DTT and an intact Fe-S center. Furthermore, the ring contraction process was shown not to involve a change in the oxidation state of the central cobalt ion of the macrocycle. << Less