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- 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 9,431 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline Mg-131-hydroxyprotoporphyrin 13-monomethyl ester Identifier CHEBI:60489 Charge -1 Formula C35H33MgN4O5 InChIKeyhelp_outline MVCDIAGKFJFPBB-JXBSUKTBSA-L SMILEShelp_outline COC(=O)CC(O)c1c(C)c2C=C3C(C=C)=C(C)C4=[N+]3[Mg--]35n2c1C=C1C(CCC([O-])=O)=C(C)C(C=c2c(C)c(C=C)c(=C4)n32)=[N+]51 2D coordinates Mol file for the small molecule Search links Involved in 4 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NADPH Identifier CHEBI:57783 (Beilstein: 10411862) help_outline Charge -4 Formula C21H26N7O17P3 InChIKeyhelp_outline ACFIXJIJDZMPPO-NNYOXOHSSA-J SMILEShelp_outline NC(=O)C1=CN(C=CC1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](OP([O-])([O-])=O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,279 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline O2 Identifier CHEBI:15379 (CAS: 7782-44-7) help_outline Charge 0 Formula O2 InChIKeyhelp_outline MYMOFIZGZYHOMD-UHFFFAOYSA-N SMILEShelp_outline O=O 2D coordinates Mol file for the small molecule Search links Involved in 2,709 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H2O Identifier CHEBI:15377 (Beilstein: 3587155; CAS: 7732-18-5) help_outline Charge 0 Formula H2O InChIKeyhelp_outline XLYOFNOQVPJJNP-UHFFFAOYSA-N SMILEShelp_outline [H]O[H] 2D coordinates Mol file for the small molecule Search links Involved in 6,204 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline Mg-131-oxoprotoporphyrin 13-monomethyl ester Identifier CHEBI:60490 Charge -1 Formula C35H31MgN4O5 InChIKeyhelp_outline IOQIILLGNAOXJE-JXBSUKTBSA-K SMILEShelp_outline COC(=O)CC(=O)c1c(C)c2C=C3C(C=C)=C(C)C4=[N+]3[Mg--]35n2c1C=C1C(CCC([O-])=O)=C(C)C(C=c2c(C)c(C=C)c(=C4)n32)=[N+]51 2D coordinates Mol file for the small molecule Search links Involved in 4 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NADP+ Identifier CHEBI:58349 Charge -3 Formula C21H25N7O17P3 InChIKeyhelp_outline XJLXINKUBYWONI-NNYOXOHSSA-K SMILEShelp_outline NC(=O)c1ccc[n+](c1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](OP([O-])([O-])=O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,285 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:20541 | RHEA:20542 | RHEA:20543 | RHEA:20544 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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The Chlorophyll Biosynthetic Enzyme Mg-Protoporphyrin IX Monomethyl Ester (Oxidative) Cyclase (Characterization and Partial Purification from Chlamydomonas reinhardtii and Synechocystis sp. PCC 6803).
Bollivar D.W., Beale S.I.
A universal structural feature of chlorophyll molecules is the isocyclic ring. This ring is formed by the action of the enzyme Mg-protoporphyrin IX monomethyl ester (oxidative) cyclase, which catalyzes a complex reaction in which Mg-protoporphyrin IX monomethyl ester is converted to divinyl protoc ... >> More
A universal structural feature of chlorophyll molecules is the isocyclic ring. This ring is formed by the action of the enzyme Mg-protoporphyrin IX monomethyl ester (oxidative) cyclase, which catalyzes a complex reaction in which Mg-protoporphyrin IX monomethyl ester is converted to divinyl protochlorophyllide (also called Mg-2,4-divinylpheoporphyrin a5), with the participation of NADPH and O2. Cyclase activity was demonstrated in lysed Chlamydomonas reinhardtii chloroplasts and extracts of Synechocystis sp. PCC 6803. The yield of the reaction product was increased by the addition of catalase and ascorbate or isoascorbate to the incubation mixture. These compounds may act by preventing degradation of the tetrapyrroles by reactive oxygen species. Cyclase activity from C. reinhardtii was not inhibited by the flavoprotein inhibitor quinacrine or by the hemoprotein inhibitors CO, KCN, or NaN3. In contrast, cyclase activity in extracts of C. reinhardtii and Synechocystis sp. PCC 6803 was inhibited by chelators of Fe, suggesting that nonheme Fe is involved in the reaction. Cyclase in lysed C. reinhardtii chloroplasts was associated with the membranes, and attempts to further fractionate or solubilize the activity were unsuccessful. In contrast, cyclase in Synechocystis sp. PCC 6803 extracts could be separated into soluble and membrane components, both of which were required for reconstitution of activity. The membrane component retained activity after it was solubilized by the detergent n-octyl-[beta]-D-glucopyranoside in the presence of glycerol and Mg2+. The solubilized membrane component was purified further by dye-affinity and ion-exchange chromatography. << Less
Plant Physiol 112:105-114(1996) [PubMed] [EuropePMC]
This publication is cited by 3 other entries.
Comments
RHEA:20541 part of RHEA:33235